Merge pull request #1319 from bitcoinjs/typeScript

Initial TypeScript implementation

.prettierrc.json

@@ -0,0 +1,4 @@
+{
+  "singleQuote": true,
+  "trailingComma": "all"
+}

.travis.yml

@@ -1,13 +1,16 @@
 sudo: false
 language: node_js
 node_js:
+  - "8"
   - "lts/*"
-  - "9"
-  - "10"
 matrix:
   include:
     - node_js: "lts/*"
-      env: TEST_SUITE=standard
+      env: TEST_SUITE=format:ci
+    - node_js: "lts/*"
+      env: TEST_SUITE=gitdiff:ci
+    - node_js: "lts/*"
+      env: TEST_SUITE=lint
     - node_js: "lts/*"
       env: TEST_SUITE=coverage
 env:

CHANGELOG.md

@@ -1,3 +1,15 @@
+# 5.0.0
+__added__
+- TypeScript support (#1319)
+- `Block.prototype.checkTxRoots` will check the merkleRoot and witnessCommit if it exists against the transactions array. (e52abec) (0426c66)
+
+__changed__
+- `Transaction.prototype.getHash` now has `forWitness?: boolean` which when true returns the hash for wtxid (a652d04)
+- `Block.calculateMerkleRoot` now has `forWitness?: boolean` which when true returns the witness commit (a652d04)
+
+__removed__
+- `Block.prototype.checkMerkleRoot` was removed, please use `checkTxRoots` (0426c66)
+
 # 4.0.3
 __fixed__
 - Fixed `TransactionBuilder` to require that the Transaction has outputs before signing (#1151)

CONTRIBUTING.md

@@ -49,6 +49,22 @@ The length of time required for peer review is unpredictable and will vary from
 Refer to the [Git manual](https://git-scm.com/doc) for any information about `git`.
 
 
+## Regarding TypeScript
+This library is written in TypeScript with tslint, prettier, and the tsc transpiler. These tools will help during testing to notice improper logic before committing and sending a pull request.
+
+Some rules regarding TypeScript:
+
+* Modify the typescript source code in an IDE that will give you warnings for transpile/lint errors.
+* Once you are done with the modifications, run `npm run format` then `npm test`
+* Running the tests will transpile the ts files into js and d.ts files.
+* Use `git diff` or other tools to verify that the ts and js are changing the same parts.
+* Commit all changes to ts, js, and d.ts files.
+* Add tests where necessary.
+* Submit your pull request.
+
+Using TypeScript is for preventing bugs while writing code, as well as automatically generating type definitions. However, the JS file diffs must be verified, and any unverified JS will not be published to npm.
+
+
 ## We adhere to Bitcoin-Core policy
 Bitcoin script payment/script templates are based on community consensus,  but typically adhere to bitcoin-core node policy by default.
 

README.md

@@ -2,9 +2,9 @@
 [![Build Status](https://travis-ci.org/bitcoinjs/bitcoinjs-lib.png?branch=master)](https://travis-ci.org/bitcoinjs/bitcoinjs-lib)
 [![NPM](https://img.shields.io/npm/v/bitcoinjs-lib.svg)](https://www.npmjs.org/package/bitcoinjs-lib)
 
-[![js-standard-style](https://cdn.rawgit.com/feross/standard/master/badge.svg)](https://github.com/feross/standard)
+[![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg?style=flat-square)](https://github.com/prettier/prettier)
 
-A javascript Bitcoin library for node.js and browsers.
+A javascript Bitcoin library for node.js and browsers. Written in TypeScript, but committing the JS files to verify.
 
 Released under the terms of the [MIT LICENSE](LICENSE).
 
@@ -23,7 +23,7 @@ Mistakes and bugs happen, but with your help in resolving and reporting [issues]
 - Easy to audit and verify,
 - Tested, with test coverage >95%,
 - Advanced and feature rich,
-- Standardized, using [standard](https://github.com/standard/standard) and Node `Buffer`'s throughout, and
+- Standardized, using [prettier](https://github.com/prettier/prettier) and Node `Buffer`'s throughout, and
 - Friendly, with a strong and helpful community, ready to answer questions.
 
 
@@ -78,30 +78,7 @@ If you're familiar with how to use browserify, ignore this and carry on, otherwi
 **WARNING**: iOS devices have [problems](https://github.com/feross/buffer/issues/136), use atleast [buffer@5.0.5](https://github.com/feross/buffer/pull/155) or greater,  and enforce the test suites (for `Buffer`, and any other dependency) pass before use.
 
 ### Typescript or VSCode users
-Type declarations for Typescript [are available](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/0897921174860ec3d5318992d2323b3ae8100a68/types/bitcoinjs-lib) for version `^3.0.0` of the library.
-
-``` bash
-npm install @types/bitcoinjs-lib
-```
-
-For VSCode (and other editors), it is advised to install the type declarations, as Intellisense uses that information to help you code (autocompletion, static analysis).
-
-**WARNING**: These Typescript definitions are not maintained by the maintainers of this repository, and are instead maintained at [DefinitelyTyped](https://github.com/DefinitelyTyped/DefinitelyTyped).
-Please report any issues or problems there.
-
-
-### Flow
-[Flow-type](https://flowtype.org/) definitions for are available in the [flow-*typed* repository](https://github.com/flowtype/flow-typed/tree/master/definitions/npm/bitcoinjs-lib_v2.x.x) for version `^2.0.0` of the library.
-
-You can [download them directly](https://github.com/flowtype/flow-typed/blob/master/definitions/npm/bitcoinjs-lib_v2.x.x/flow_v0.17.x-/bitcoinjs-lib_v2.x.x.js), or using the flow-typed CLI:
-
-``` bash
-npm install -g flow-typed
-flow-typed install -f 0.27 bitcoinjs-lib@2.2.0
-```
-
-**WARNING**: These flow-typed definitions are not maintained by the maintainers of this repository.
-
+Type declarations for Typescript are included in this library. Normal installation should include all the needed type information.
 
 ## Examples
 The below examples are implemented as integration tests, they should be very easy to understand.

package.json

@@ -1,8 +1,9 @@
 {
   "name": "bitcoinjs-lib",
-  "version": "4.0.3",
+  "version": "5.0.0",
   "description": "Client-side Bitcoin JavaScript library",
   "main": "./src/index.js",
+  "types": "./types/index.d.ts",
   "engines": {
     "node": ">=8.0.0"
   },
@@ -14,24 +15,36 @@
     "bitcoinjs"
   ],
   "scripts": {
-    "coverage-report": "nyc report --reporter=lcov",
-    "coverage-html": "nyc report --reporter=html",
-    "coverage": "nyc --check-coverage --branches 90 --functions 90 mocha",
-    "integration": "mocha --timeout 50000 test/integration/",
-    "standard": "standard",
-    "test": "npm run standard && npm run coverage",
-    "unit": "mocha"
+    "build": "tsc -p ./tsconfig.json",
+    "coverage-report": "npm run build && npm run nobuild:coverage-report",
+    "coverage-html": "npm run build && npm run nobuild:coverage-html",
+    "coverage": "npm run build && npm run nobuild:coverage",
+    "format": "npm run prettier -- --write",
+    "format:ci": "npm run prettier -- --check",
+    "gitdiff:ci": "npm run build && git diff --exit-code",
+    "integration": "npm run build && npm run nobuild:integration",
+    "lint": "tslint -p tsconfig.json -c tslint.json",
+    "nobuild:coverage-report": "nyc report --reporter=lcov",
+    "nobuild:coverage-html": "nyc report --reporter=html",
+    "nobuild:coverage": "nyc --check-coverage --branches 90 --functions 90 --lines 90 mocha",
+    "nobuild:integration": "mocha --timeout 50000 test/integration/",
+    "nobuild:unit": "mocha",
+    "prettier": "prettier 'ts_src/**/*.ts' --ignore-path ./.prettierignore",
+    "test": "npm run build && npm run format:ci && npm run lint && npm run nobuild:coverage",
+    "unit": "npm run build && npm run nobuild:unit"
   },
   "repository": {
     "type": "git",
     "url": "https://github.com/bitcoinjs/bitcoinjs-lib.git"
   },
   "files": [
-    "src"
+    "src",
+    "types"
   ],
   "dependencies": {
+    "@types/node": "10.12.18",
     "bech32": "^1.1.2",
-    "bip32": "^1.0.0",
+    "bip32": "^2.0.0",
     "bip66": "^1.1.0",
     "bitcoin-ops": "^1.4.0",
     "bs58check": "^2.0.0",
@@ -40,7 +53,6 @@
     "merkle-lib": "^2.0.10",
     "pushdata-bitcoin": "^1.0.1",
     "randombytes": "^2.0.1",
-    "safe-buffer": "^5.1.1",
     "tiny-secp256k1": "^1.0.0",
     "typeforce": "^1.11.3",
     "varuint-bitcoin": "^1.0.4",
@@ -56,9 +68,11 @@
     "hoodwink": "^2.0.0",
     "minimaldata": "^1.0.2",
     "mocha": "^5.2.0",
-    "nyc": "^11.8.0",
+    "nyc": "^13.3.0",
+    "prettier": "1.16.4",
     "proxyquire": "^2.0.1",
-    "standard": "^11.0.1"
+    "tslint": "5.13.1",
+    "typescript": "3.2.2"
   },
   "license": "MIT"
 }

src/address.js

@@ -1,97 +1,100 @@
-const Buffer = require('safe-buffer').Buffer
-const bech32 = require('bech32')
-const bs58check = require('bs58check')
-const bscript = require('./script')
-const networks = require('./networks')
-const typeforce = require('typeforce')
-const types = require('./types')
-const payments = require('./payments')
-
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const networks = require("./networks");
+const payments = require("./payments");
+const bscript = require("./script");
+const types = require("./types");
+const bech32 = require('bech32');
+const bs58check = require('bs58check');
+const typeforce = require('typeforce');
 function fromBase58Check(address) {
-  const payload = bs58check.decode(address)
-
+    const payload = bs58check.decode(address);
     // TODO: 4.0.0, move to "toOutputScript"
-  if (payload.length < 21) throw new TypeError(address + ' is too short')
-  if (payload.length > 21) throw new TypeError(address + ' is too long')
-
-  const version = payload.readUInt8(0)
-  const hash = payload.slice(1)
-
-  return { version: version, hash: hash }
+    if (payload.length < 21)
+        throw new TypeError(address + ' is too short');
+    if (payload.length > 21)
+        throw new TypeError(address + ' is too long');
+    const version = payload.readUInt8(0);
+    const hash = payload.slice(1);
+    return { version, hash };
 }
-
+exports.fromBase58Check = fromBase58Check;
 function fromBech32(address) {
-  const result = bech32.decode(address)
-  const data = bech32.fromWords(result.words.slice(1))
-
+    const result = bech32.decode(address);
+    const data = bech32.fromWords(result.words.slice(1));
     return {
         version: result.words[0],
         prefix: result.prefix,
-    data: Buffer.from(data)
+        data: Buffer.from(data),
+    };
 }
-}
-
+exports.fromBech32 = fromBech32;
 function toBase58Check(hash, version) {
-  typeforce(types.tuple(types.Hash160bit, types.UInt8), arguments)
-
-  const payload = Buffer.allocUnsafe(21)
-  payload.writeUInt8(version, 0)
-  hash.copy(payload, 1)
-
-  return bs58check.encode(payload)
+    typeforce(types.tuple(types.Hash160bit, types.UInt8), arguments);
+    const payload = Buffer.allocUnsafe(21);
+    payload.writeUInt8(version, 0);
+    hash.copy(payload, 1);
+    return bs58check.encode(payload);
 }
-
+exports.toBase58Check = toBase58Check;
 function toBech32(data, version, prefix) {
-  const words = bech32.toWords(data)
-  words.unshift(version)
-
-  return bech32.encode(prefix, words)
+    const words = bech32.toWords(data);
+    words.unshift(version);
+    return bech32.encode(prefix, words);
 }
-
+exports.toBech32 = toBech32;
 function fromOutputScript(output, network) {
-  network = network || networks.bitcoin
-
-  try { return payments.p2pkh({ output, network }).address } catch (e) {}
-  try { return payments.p2sh({ output, network }).address } catch (e) {}
-  try { return payments.p2wpkh({ output, network }).address } catch (e) {}
-  try { return payments.p2wsh({ output, network }).address } catch (e) {}
-
-  throw new Error(bscript.toASM(output) + ' has no matching Address')
+    // TODO: Network
+    network = network || networks.bitcoin;
+    try {
+        return payments.p2pkh({ output, network }).address;
     }
-
+    catch (e) { }
+    try {
+        return payments.p2sh({ output, network }).address;
+    }
+    catch (e) { }
+    try {
+        return payments.p2wpkh({ output, network }).address;
+    }
+    catch (e) { }
+    try {
+        return payments.p2wsh({ output, network }).address;
+    }
+    catch (e) { }
+    throw new Error(bscript.toASM(output) + ' has no matching Address');
+}
+exports.fromOutputScript = fromOutputScript;
 function toOutputScript(address, network) {
-  network = network || networks.bitcoin
-
-  let decode
+    network = network || networks.bitcoin;
+    let decodeBase58;
+    let decodeBech32;
     try {
-    decode = fromBase58Check(address)
-  } catch (e) {}
-
-  if (decode) {
-    if (decode.version === network.pubKeyHash) return payments.p2pkh({ hash: decode.hash }).output
-    if (decode.version === network.scriptHash) return payments.p2sh({ hash: decode.hash }).output
-  } else {
+        decodeBase58 = fromBase58Check(address);
+    }
+    catch (e) { }
+    if (decodeBase58) {
+        if (decodeBase58.version === network.pubKeyHash)
+            return payments.p2pkh({ hash: decodeBase58.hash }).output;
+        if (decodeBase58.version === network.scriptHash)
+            return payments.p2sh({ hash: decodeBase58.hash }).output;
+    }
+    else {
         try {
-      decode = fromBech32(address)
-    } catch (e) {}
-
-    if (decode) {
-      if (decode.prefix !== network.bech32) throw new Error(address + ' has an invalid prefix')
-      if (decode.version === 0) {
-        if (decode.data.length === 20) return payments.p2wpkh({ hash: decode.data }).output
-        if (decode.data.length === 32) return payments.p2wsh({ hash: decode.data }).output
+            decodeBech32 = fromBech32(address);
+        }
+        catch (e) { }
+        if (decodeBech32) {
+            if (decodeBech32.prefix !== network.bech32)
+                throw new Error(address + ' has an invalid prefix');
+            if (decodeBech32.version === 0) {
+                if (decodeBech32.data.length === 20)
+                    return payments.p2wpkh({ hash: decodeBech32.data }).output;
+                if (decodeBech32.data.length === 32)
+                    return payments.p2wsh({ hash: decodeBech32.data }).output;
             }
         }
     }
-
-  throw new Error(address + ' has no matching Script')
-}
-
-module.exports = {
-  fromBase58Check: fromBase58Check,
-  fromBech32: fromBech32,
-  fromOutputScript: fromOutputScript,
-  toBase58Check: toBase58Check,
-  toBech32: toBech32,
-  toOutputScript: toOutputScript
+    throw new Error(address + ' has no matching Script');
 }
+exports.toOutputScript = toOutputScript;

src/block.js

@@ -1,177 +1,222 @@
-const Buffer = require('safe-buffer').Buffer
-const bcrypto = require('./crypto')
-const fastMerkleRoot = require('merkle-lib/fastRoot')
-const typeforce = require('typeforce')
-const types = require('./types')
-const varuint = require('varuint-bitcoin')
-
-const Transaction = require('./transaction')
-
-function Block () {
-  this.version = 1
-  this.prevHash = null
-  this.merkleRoot = null
-  this.timestamp = 0
-  this.bits = 0
-  this.nonce = 0
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const bufferutils_1 = require("./bufferutils");
+const bcrypto = require("./crypto");
+const transaction_1 = require("./transaction");
+const types = require("./types");
+const fastMerkleRoot = require('merkle-lib/fastRoot');
+const typeforce = require('typeforce');
+const varuint = require('varuint-bitcoin');
+const errorMerkleNoTxes = new TypeError('Cannot compute merkle root for zero transactions');
+const errorWitnessNotSegwit = new TypeError('Cannot compute witness commit for non-segwit block');
+class Block {
+    constructor() {
+        this.version = 1;
+        this.prevHash = undefined;
+        this.merkleRoot = undefined;
+        this.timestamp = 0;
+        this.witnessCommit = undefined;
+        this.bits = 0;
+        this.nonce = 0;
+        this.transactions = undefined;
     }
-
-Block.fromBuffer = function (buffer) {
-  if (buffer.length < 80) throw new Error('Buffer too small (< 80 bytes)')
-
-  let offset = 0
-  function readSlice (n) {
-    offset += n
-    return buffer.slice(offset - n, offset)
+    static fromBuffer(buffer) {
+        if (buffer.length < 80)
+            throw new Error('Buffer too small (< 80 bytes)');
+        let offset = 0;
+        const readSlice = (n) => {
+            offset += n;
+            return buffer.slice(offset - n, offset);
+        };
+        const readUInt32 = () => {
+            const i = buffer.readUInt32LE(offset);
+            offset += 4;
+            return i;
+        };
+        const readInt32 = () => {
+            const i = buffer.readInt32LE(offset);
+            offset += 4;
+            return i;
+        };
+        const block = new Block();
+        block.version = readInt32();
+        block.prevHash = readSlice(32);
+        block.merkleRoot = readSlice(32);
+        block.timestamp = readUInt32();
+        block.bits = readUInt32();
+        block.nonce = readUInt32();
+        if (buffer.length === 80)
+            return block;
+        const readVarInt = () => {
+            const vi = varuint.decode(buffer, offset);
+            offset += varuint.decode.bytes;
+            return vi;
+        };
+        const readTransaction = () => {
+            const tx = transaction_1.Transaction.fromBuffer(buffer.slice(offset), true);
+            offset += tx.byteLength();
+            return tx;
+        };
+        const nTransactions = readVarInt();
+        block.transactions = [];
+        for (let i = 0; i < nTransactions; ++i) {
+            const tx = readTransaction();
+            block.transactions.push(tx);
         }
-
-  function readUInt32 () {
-    const i = buffer.readUInt32LE(offset)
-    offset += 4
-    return i
+        const witnessCommit = block.getWitnessCommit();
+        // This Block contains a witness commit
+        if (witnessCommit)
+            block.witnessCommit = witnessCommit;
+        return block;
     }
-
-  function readInt32 () {
-    const i = buffer.readInt32LE(offset)
-    offset += 4
-    return i
+    static fromHex(hex) {
+        return Block.fromBuffer(Buffer.from(hex, 'hex'));
     }
-
-  const block = new Block()
-  block.version = readInt32()
-  block.prevHash = readSlice(32)
-  block.merkleRoot = readSlice(32)
-  block.timestamp = readUInt32()
-  block.bits = readUInt32()
-  block.nonce = readUInt32()
-
-  if (buffer.length === 80) return block
-
-  function readVarInt () {
-    const vi = varuint.decode(buffer, offset)
-    offset += varuint.decode.bytes
-    return vi
+    static calculateTarget(bits) {
+        const exponent = ((bits & 0xff000000) >> 24) - 3;
+        const mantissa = bits & 0x007fffff;
+        const target = Buffer.alloc(32, 0);
+        target.writeUIntBE(mantissa, 29 - exponent, 3);
+        return target;
     }
-
-  function readTransaction () {
-    const tx = Transaction.fromBuffer(buffer.slice(offset), true)
-    offset += tx.byteLength()
-    return tx
+    static calculateMerkleRoot(transactions, forWitness) {
+        typeforce([{ getHash: types.Function }], transactions);
+        if (transactions.length === 0)
+            throw errorMerkleNoTxes;
+        if (forWitness && !txesHaveWitnessCommit(transactions))
+            throw errorWitnessNotSegwit;
+        const hashes = transactions.map(transaction => transaction.getHash(forWitness));
+        const rootHash = fastMerkleRoot(hashes, bcrypto.hash256);
+        return forWitness
+            ? bcrypto.hash256(Buffer.concat([rootHash, transactions[0].ins[0].witness[0]]))
+            : rootHash;
     }
-
-  const nTransactions = readVarInt()
-  block.transactions = []
-
-  for (var i = 0; i < nTransactions; ++i) {
-    const tx = readTransaction()
-    block.transactions.push(tx)
+    getWitnessCommit() {
+        if (!txesHaveWitnessCommit(this.transactions))
+            return null;
+        // The merkle root for the witness data is in an OP_RETURN output.
+        // There is no rule for the index of the output, so use filter to find it.
+        // The root is prepended with 0xaa21a9ed so check for 0x6a24aa21a9ed
+        // If multiple commits are found, the output with highest index is assumed.
+        const witnessCommits = this.transactions[0].outs.filter(out => out.script.slice(0, 6).equals(Buffer.from('6a24aa21a9ed', 'hex'))).map(out => out.script.slice(6, 38));
+        if (witnessCommits.length === 0)
+            return null;
+        // Use the commit with the highest output (should only be one though)
+        const result = witnessCommits[witnessCommits.length - 1];
+        if (!(result instanceof Buffer && result.length === 32))
+            return null;
+        return result;
     }
-
-  return block
+    hasWitnessCommit() {
+        if (this.witnessCommit instanceof Buffer &&
+            this.witnessCommit.length === 32)
+            return true;
+        if (this.getWitnessCommit() !== null)
+            return true;
+        return false;
     }
-
-Block.prototype.byteLength = function (headersOnly) {
-  if (headersOnly || !this.transactions) return 80
-
-  return 80 + varuint.encodingLength(this.transactions.length) + this.transactions.reduce(function (a, x) {
-    return a + x.byteLength()
-  }, 0)
+    hasWitness() {
+        return anyTxHasWitness(this.transactions);
     }
-
-Block.fromHex = function (hex) {
-  return Block.fromBuffer(Buffer.from(hex, 'hex'))
+    byteLength(headersOnly) {
+        if (headersOnly || !this.transactions)
+            return 80;
+        return (80 +
+            varuint.encodingLength(this.transactions.length) +
+            this.transactions.reduce((a, x) => a + x.byteLength(), 0));
     }
-
-Block.prototype.getHash = function () {
-  return bcrypto.hash256(this.toBuffer(true))
+    getHash() {
+        return bcrypto.hash256(this.toBuffer(true));
     }
-
-Block.prototype.getId = function () {
-  return this.getHash().reverse().toString('hex')
+    getId() {
+        return bufferutils_1.reverseBuffer(this.getHash()).toString('hex');
     }
-
-Block.prototype.getUTCDate = function () {
-  const date = new Date(0) // epoch
-  date.setUTCSeconds(this.timestamp)
-
-  return date
+    getUTCDate() {
+        const date = new Date(0); // epoch
+        date.setUTCSeconds(this.timestamp);
+        return date;
     }
-
     // TODO: buffer, offset compatibility
-Block.prototype.toBuffer = function (headersOnly) {
-  const buffer = Buffer.allocUnsafe(this.byteLength(headersOnly))
-
-  let offset = 0
-  function writeSlice (slice) {
-    slice.copy(buffer, offset)
-    offset += slice.length
+    toBuffer(headersOnly) {
+        const buffer = Buffer.allocUnsafe(this.byteLength(headersOnly));
+        let offset = 0;
+        const writeSlice = (slice) => {
+            slice.copy(buffer, offset);
+            offset += slice.length;
+        };
+        const writeInt32 = (i) => {
+            buffer.writeInt32LE(i, offset);
+            offset += 4;
+        };
+        const writeUInt32 = (i) => {
+            buffer.writeUInt32LE(i, offset);
+            offset += 4;
+        };
+        writeInt32(this.version);
+        writeSlice(this.prevHash);
+        writeSlice(this.merkleRoot);
+        writeUInt32(this.timestamp);
+        writeUInt32(this.bits);
+        writeUInt32(this.nonce);
+        if (headersOnly || !this.transactions)
+            return buffer;
+        varuint.encode(this.transactions.length, buffer, offset);
+        offset += varuint.encode.bytes;
+        this.transactions.forEach(tx => {
+            const txSize = tx.byteLength(); // TODO: extract from toBuffer?
+            tx.toBuffer(buffer, offset);
+            offset += txSize;
+        });
+        return buffer;
     }
-
-  function writeInt32 (i) {
-    buffer.writeInt32LE(i, offset)
-    offset += 4
+    toHex(headersOnly) {
+        return this.toBuffer(headersOnly).toString('hex');
     }
-  function writeUInt32 (i) {
-    buffer.writeUInt32LE(i, offset)
-    offset += 4
+    checkTxRoots() {
+        // If the Block has segwit transactions but no witness commit,
+        // there's no way it can be valid, so fail the check.
+        const hasWitnessCommit = this.hasWitnessCommit();
+        if (!hasWitnessCommit && this.hasWitness())
+            return false;
+        return (this.__checkMerkleRoot() &&
+            (hasWitnessCommit ? this.__checkWitnessCommit() : true));
     }
-
-  writeInt32(this.version)
-  writeSlice(this.prevHash)
-  writeSlice(this.merkleRoot)
-  writeUInt32(this.timestamp)
-  writeUInt32(this.bits)
-  writeUInt32(this.nonce)
-
-  if (headersOnly || !this.transactions) return buffer
-
-  varuint.encode(this.transactions.length, buffer, offset)
-  offset += varuint.encode.bytes
-
-  this.transactions.forEach(function (tx) {
-    const txSize = tx.byteLength() // TODO: extract from toBuffer?
-    tx.toBuffer(buffer, offset)
-    offset += txSize
-  })
-
-  return buffer
+    checkProofOfWork() {
+        const hash = bufferutils_1.reverseBuffer(this.getHash());
+        const target = Block.calculateTarget(this.bits);
+        return hash.compare(target) <= 0;
     }
-
-Block.prototype.toHex = function (headersOnly) {
-  return this.toBuffer(headersOnly).toString('hex')
+    __checkMerkleRoot() {
+        if (!this.transactions)
+            throw errorMerkleNoTxes;
+        const actualMerkleRoot = Block.calculateMerkleRoot(this.transactions);
+        return this.merkleRoot.compare(actualMerkleRoot) === 0;
     }
-
-Block.calculateTarget = function (bits) {
-  const exponent = ((bits & 0xff000000) >> 24) - 3
-  const mantissa = bits & 0x007fffff
-  const target = Buffer.alloc(32, 0)
-  target.writeUIntBE(mantissa, 29 - exponent, 3)
-  return target
+    __checkWitnessCommit() {
+        if (!this.transactions)
+            throw errorMerkleNoTxes;
+        if (!this.hasWitnessCommit())
+            throw errorWitnessNotSegwit;
+        const actualWitnessCommit = Block.calculateMerkleRoot(this.transactions, true);
+        return this.witnessCommit.compare(actualWitnessCommit) === 0;
     }
-
-Block.calculateMerkleRoot = function (transactions) {
-  typeforce([{ getHash: types.Function }], transactions)
-  if (transactions.length === 0) throw TypeError('Cannot compute merkle root for zero transactions')
-
-  const hashes = transactions.map(function (transaction) {
-    return transaction.getHash()
-  })
-
-  return fastMerkleRoot(hashes, bcrypto.hash256)
 }
-
-Block.prototype.checkMerkleRoot = function () {
-  if (!this.transactions) return false
-
-  const actualMerkleRoot = Block.calculateMerkleRoot(this.transactions)
-  return this.merkleRoot.compare(actualMerkleRoot) === 0
+exports.Block = Block;
+function txesHaveWitnessCommit(transactions) {
+    return (transactions instanceof Array &&
+        transactions[0] &&
+        transactions[0].ins &&
+        transactions[0].ins instanceof Array &&
+        transactions[0].ins[0] &&
+        transactions[0].ins[0].witness &&
+        transactions[0].ins[0].witness instanceof Array &&
+        transactions[0].ins[0].witness.length > 0);
 }
-
-Block.prototype.checkProofOfWork = function () {
-  const hash = this.getHash().reverse()
-  const target = Block.calculateTarget(this.bits)
-
-  return hash.compare(target) <= 0
+function anyTxHasWitness(transactions) {
+    return (transactions instanceof Array &&
+        transactions.some(tx => typeof tx === 'object' &&
+            tx.ins instanceof Array &&
+            tx.ins.some(input => typeof input === 'object' &&
+                input.witness instanceof Array &&
+                input.witness.length > 0)));
 }
-
-module.exports = Block

src/bufferutils.js

@@ -1,29 +1,42 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
 // https://github.com/feross/buffer/blob/master/index.js#L1127
 function verifuint(value, max) {
-  if (typeof value !== 'number') throw new Error('cannot write a non-number as a number')
-  if (value < 0) throw new Error('specified a negative value for writing an unsigned value')
-  if (value > max) throw new Error('RangeError: value out of range')
-  if (Math.floor(value) !== value) throw new Error('value has a fractional component')
+    if (typeof value !== 'number')
+        throw new Error('cannot write a non-number as a number');
+    if (value < 0)
+        throw new Error('specified a negative value for writing an unsigned value');
+    if (value > max)
+        throw new Error('RangeError: value out of range');
+    if (Math.floor(value) !== value)
+        throw new Error('value has a fractional component');
 }
-
 function readUInt64LE(buffer, offset) {
-  const a = buffer.readUInt32LE(offset)
-  let b = buffer.readUInt32LE(offset + 4)
-  b *= 0x100000000
-
-  verifuint(b + a, 0x001fffffffffffff)
-  return b + a
+    const a = buffer.readUInt32LE(offset);
+    let b = buffer.readUInt32LE(offset + 4);
+    b *= 0x100000000;
+    verifuint(b + a, 0x001fffffffffffff);
+    return b + a;
 }
-
+exports.readUInt64LE = readUInt64LE;
 function writeUInt64LE(buffer, value, offset) {
-  verifuint(value, 0x001fffffffffffff)
-
-  buffer.writeInt32LE(value & -1, offset)
-  buffer.writeUInt32LE(Math.floor(value / 0x100000000), offset + 4)
-  return offset + 8
+    verifuint(value, 0x001fffffffffffff);
+    buffer.writeInt32LE(value & -1, offset);
+    buffer.writeUInt32LE(Math.floor(value / 0x100000000), offset + 4);
+    return offset + 8;
 }
-
-module.exports = {
-  readUInt64LE: readUInt64LE,
-  writeUInt64LE: writeUInt64LE
+exports.writeUInt64LE = writeUInt64LE;
+function reverseBuffer(buffer) {
+    if (buffer.length < 1)
+        return buffer;
+    let j = buffer.length - 1;
+    let tmp = 0;
+    for (let i = 0; i < buffer.length / 2; i++) {
+        tmp = buffer[i];
+        buffer[i] = buffer[j];
+        buffer[j] = tmp;
+        j--;
     }
+    return buffer;
+}
+exports.reverseBuffer = reverseBuffer;

src/classify.js

@@ -1,13 +1,14 @@
-const decompile = require('./script').decompile
-const multisig = require('./templates/multisig')
-const nullData = require('./templates/nulldata')
-const pubKey = require('./templates/pubkey')
-const pubKeyHash = require('./templates/pubkeyhash')
-const scriptHash = require('./templates/scripthash')
-const witnessPubKeyHash = require('./templates/witnesspubkeyhash')
-const witnessScriptHash = require('./templates/witnessscripthash')
-const witnessCommitment = require('./templates/witnesscommitment')
-
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const script_1 = require("./script");
+const multisig = require("./templates/multisig");
+const nullData = require("./templates/nulldata");
+const pubKey = require("./templates/pubkey");
+const pubKeyHash = require("./templates/pubkeyhash");
+const scriptHash = require("./templates/scripthash");
+const witnessCommitment = require("./templates/witnesscommitment");
+const witnessPubKeyHash = require("./templates/witnesspubkeyhash");
+const witnessScriptHash = require("./templates/witnessscripthash");
 const types = {
     P2MS: 'multisig',
     NONSTANDARD: 'nonstandard',
@@ -17,54 +18,58 @@ const types = {
     P2SH: 'scripthash',
     P2WPKH: 'witnesspubkeyhash',
     P2WSH: 'witnessscripthash',
-  WITNESS_COMMITMENT: 'witnesscommitment'
-}
-
+    WITNESS_COMMITMENT: 'witnesscommitment',
+};
+exports.types = types;
 function classifyOutput(script) {
-  if (witnessPubKeyHash.output.check(script)) return types.P2WPKH
-  if (witnessScriptHash.output.check(script)) return types.P2WSH
-  if (pubKeyHash.output.check(script)) return types.P2PKH
-  if (scriptHash.output.check(script)) return types.P2SH
-
+    if (witnessPubKeyHash.output.check(script))
+        return types.P2WPKH;
+    if (witnessScriptHash.output.check(script))
+        return types.P2WSH;
+    if (pubKeyHash.output.check(script))
+        return types.P2PKH;
+    if (scriptHash.output.check(script))
+        return types.P2SH;
     // XXX: optimization, below functions .decompile before use
-  const chunks = decompile(script)
-  if (!chunks) throw new TypeError('Invalid script')
-
-  if (multisig.output.check(chunks)) return types.P2MS
-  if (pubKey.output.check(chunks)) return types.P2PK
-  if (witnessCommitment.output.check(chunks)) return types.WITNESS_COMMITMENT
-  if (nullData.output.check(chunks)) return types.NULLDATA
-
-  return types.NONSTANDARD
+    const chunks = script_1.decompile(script);
+    if (!chunks)
+        throw new TypeError('Invalid script');
+    if (multisig.output.check(chunks))
+        return types.P2MS;
+    if (pubKey.output.check(chunks))
+        return types.P2PK;
+    if (witnessCommitment.output.check(chunks))
+        return types.WITNESS_COMMITMENT;
+    if (nullData.output.check(chunks))
+        return types.NULLDATA;
+    return types.NONSTANDARD;
 }
-
+exports.output = classifyOutput;
 function classifyInput(script, allowIncomplete) {
     // XXX: optimization, below functions .decompile before use
-  const chunks = decompile(script)
-  if (!chunks) throw new TypeError('Invalid script')
-
-  if (pubKeyHash.input.check(chunks)) return types.P2PKH
-  if (scriptHash.input.check(chunks, allowIncomplete)) return types.P2SH
-  if (multisig.input.check(chunks, allowIncomplete)) return types.P2MS
-  if (pubKey.input.check(chunks)) return types.P2PK
-
-  return types.NONSTANDARD
+    const chunks = script_1.decompile(script);
+    if (!chunks)
+        throw new TypeError('Invalid script');
+    if (pubKeyHash.input.check(chunks))
+        return types.P2PKH;
+    if (scriptHash.input.check(chunks, allowIncomplete))
+        return types.P2SH;
+    if (multisig.input.check(chunks, allowIncomplete))
+        return types.P2MS;
+    if (pubKey.input.check(chunks))
+        return types.P2PK;
+    return types.NONSTANDARD;
 }
-
+exports.input = classifyInput;
 function classifyWitness(script, allowIncomplete) {
     // XXX: optimization, below functions .decompile before use
-  const chunks = decompile(script)
-  if (!chunks) throw new TypeError('Invalid script')
-
-  if (witnessPubKeyHash.input.check(chunks)) return types.P2WPKH
-  if (witnessScriptHash.input.check(chunks, allowIncomplete)) return types.P2WSH
-
-  return types.NONSTANDARD
-}
-
-module.exports = {
-  input: classifyInput,
-  output: classifyOutput,
-  witness: classifyWitness,
-  types: types
+    const chunks = script_1.decompile(script);
+    if (!chunks)
+        throw new TypeError('Invalid script');
+    if (witnessPubKeyHash.input.check(chunks))
+        return types.P2WPKH;
+    if (witnessScriptHash.input.check(chunks, allowIncomplete))
+        return types.P2WSH;
+    return types.NONSTANDARD;
 }
+exports.witness = classifyWitness;

src/crypto.js

@@ -1,29 +1,36 @@
-const createHash = require('create-hash')
-
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const createHash = require('create-hash');
 function ripemd160(buffer) {
-  return createHash('rmd160').update(buffer).digest()
+    try {
+        return createHash('rmd160')
+            .update(buffer)
+            .digest();
     }
-
+    catch (err) {
+        return createHash('ripemd160')
+            .update(buffer)
+            .digest();
+    }
+}
+exports.ripemd160 = ripemd160;
 function sha1(buffer) {
-  return createHash('sha1').update(buffer).digest()
+    return createHash('sha1')
+        .update(buffer)
+        .digest();
 }
-
+exports.sha1 = sha1;
 function sha256(buffer) {
-  return createHash('sha256').update(buffer).digest()
+    return createHash('sha256')
+        .update(buffer)
+        .digest();
 }
-
+exports.sha256 = sha256;
 function hash160(buffer) {
-  return ripemd160(sha256(buffer))
+    return ripemd160(sha256(buffer));
 }
-
+exports.hash160 = hash160;
 function hash256(buffer) {
-  return sha256(sha256(buffer))
-}
-
-module.exports = {
-  hash160: hash160,
-  hash256: hash256,
-  ripemd160: ripemd160,
-  sha1: sha1,
-  sha256: sha256
+    return sha256(sha256(buffer));
 }
+exports.hash256 = hash256;

src/ecpair.js

@@ -1,106 +1,98 @@
-const ecc = require('tiny-secp256k1')
-const randomBytes = require('randombytes')
-const typeforce = require('typeforce')
-const types = require('./types')
-const wif = require('wif')
-
-const NETWORKS = require('./networks')
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const NETWORKS = require("./networks");
+const types = require("./types");
+const ecc = require('tiny-secp256k1');
+const randomBytes = require('randombytes');
+const typeforce = require('typeforce');
+const wif = require('wif');
 const isOptions = typeforce.maybe(typeforce.compile({
     compressed: types.maybe(types.Boolean),
-  network: types.maybe(types.Network)
-}))
-
-function ECPair (d, Q, options) {
-  options = options || {}
-
-  this.compressed = options.compressed === undefined ? true : options.compressed
-  this.network = options.network || NETWORKS.bitcoin
-
-  this.__d = d || null
-  this.__Q = null
-  if (Q) this.__Q = ecc.pointCompress(Q, this.compressed)
+    network: types.maybe(types.Network),
+}));
+class ECPair {
+    constructor(__D, __Q, options) {
+        this.__D = __D;
+        this.__Q = __Q;
+        if (options === undefined)
+            options = {};
+        this.compressed =
+            options.compressed === undefined ? true : options.compressed;
+        this.network = options.network || NETWORKS.bitcoin;
+        if (__Q !== undefined)
+            this.__Q = ecc.pointCompress(__Q, this.compressed);
     }
-
-Object.defineProperty(ECPair.prototype, 'privateKey', {
-  enumerable: false,
-  get: function () { return this.__d }
-})
-
-Object.defineProperty(ECPair.prototype, 'publicKey', { get: function () {
-  if (!this.__Q) this.__Q = ecc.pointFromScalar(this.__d, this.compressed)
-  return this.__Q
-}})
-
-ECPair.prototype.toWIF = function () {
-  if (!this.__d) throw new Error('Missing private key')
-  return wif.encode(this.network.wif, this.__d, this.compressed)
+    get privateKey() {
+        return this.__D;
     }
-
-ECPair.prototype.sign = function (hash) {
-  if (!this.__d) throw new Error('Missing private key')
-  return ecc.sign(hash, this.__d)
+    get publicKey() {
+        if (!this.__Q)
+            this.__Q = ecc.pointFromScalar(this.__D, this.compressed);
+        return this.__Q;
+    }
+    toWIF() {
+        if (!this.__D)
+            throw new Error('Missing private key');
+        return wif.encode(this.network.wif, this.__D, this.compressed);
+    }
+    sign(hash) {
+        if (!this.__D)
+            throw new Error('Missing private key');
+        return ecc.sign(hash, this.__D);
+    }
+    verify(hash, signature) {
+        return ecc.verify(hash, this.publicKey, signature);
     }
-
-ECPair.prototype.verify = function (hash, signature) {
-  return ecc.verify(hash, this.publicKey, signature)
 }
-
 function fromPrivateKey(buffer, options) {
-  typeforce(types.Buffer256bit, buffer)
-  if (!ecc.isPrivate(buffer)) throw new TypeError('Private key not in range [1, n)')
-  typeforce(isOptions, options)
-
-  return new ECPair(buffer, null, options)
+    typeforce(types.Buffer256bit, buffer);
+    if (!ecc.isPrivate(buffer))
+        throw new TypeError('Private key not in range [1, n)');
+    typeforce(isOptions, options);
+    return new ECPair(buffer, undefined, options);
 }
-
+exports.fromPrivateKey = fromPrivateKey;
 function fromPublicKey(buffer, options) {
-  typeforce(ecc.isPoint, buffer)
-  typeforce(isOptions, options)
-  return new ECPair(null, buffer, options)
+    typeforce(ecc.isPoint, buffer);
+    typeforce(isOptions, options);
+    return new ECPair(undefined, buffer, options);
 }
-
-function fromWIF (string, network) {
-  const decoded = wif.decode(string)
-  const version = decoded.version
-
+exports.fromPublicKey = fromPublicKey;
+function fromWIF(wifString, network) {
+    const decoded = wif.decode(wifString);
+    const version = decoded.version;
     // list of networks?
     if (types.Array(network)) {
-    network = network.filter(function (x) {
-      return version === x.wif
-    }).pop()
-
-    if (!network) throw new Error('Unknown network version')
-
+        network = network
+            .filter((x) => {
+            return version === x.wif;
+        })
+            .pop();
+        if (!network)
+            throw new Error('Unknown network version');
         // otherwise, assume a network object (or default to bitcoin)
-  } else {
-    network = network || NETWORKS.bitcoin
-
-    if (version !== network.wif) throw new Error('Invalid network version')
     }
-
+    else {
+        network = network || NETWORKS.bitcoin;
+        if (version !== network.wif)
+            throw new Error('Invalid network version');
+    }
     return fromPrivateKey(decoded.privateKey, {
         compressed: decoded.compressed,
-    network: network
-  })
+        network: network,
+    });
 }
-
+exports.fromWIF = fromWIF;
 function makeRandom(options) {
-  typeforce(isOptions, options)
-  options = options || {}
-  const rng = options.rng || randomBytes
-
-  let d
+    typeforce(isOptions, options);
+    if (options === undefined)
+        options = {};
+    const rng = options.rng || randomBytes;
+    let d;
     do {
-    d = rng(32)
-    typeforce(types.Buffer256bit, d)
-  } while (!ecc.isPrivate(d))
-
-  return fromPrivateKey(d, options)
-}
-
-module.exports = {
-  makeRandom,
-  fromPrivateKey,
-  fromPublicKey,
-  fromWIF
+        d = rng(32);
+        typeforce(types.Buffer256bit, d);
+    } while (!ecc.isPrivate(d));
+    return fromPrivateKey(d, options);
 }
+exports.makeRandom = makeRandom;

src/index.js

@@ -1,16 +1,24 @@
-const script = require('./script')
-
-module.exports = {
-  Block: require('./block'),
-  ECPair: require('./ecpair'),
-  Transaction: require('./transaction'),
-  TransactionBuilder: require('./transaction_builder'),
-
-  address: require('./address'),
-  bip32: require('bip32'),
-  crypto: require('./crypto'),
-  networks: require('./networks'),
-  opcodes: require('bitcoin-ops'),
-  payments: require('./payments'),
-  script: script
-}
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const bip32 = require("bip32");
+exports.bip32 = bip32;
+const address = require("./address");
+exports.address = address;
+const crypto = require("./crypto");
+exports.crypto = crypto;
+const ECPair = require("./ecpair");
+exports.ECPair = ECPair;
+const networks = require("./networks");
+exports.networks = networks;
+const payments = require("./payments");
+exports.payments = payments;
+const script = require("./script");
+exports.script = script;
+var block_1 = require("./block");
+exports.Block = block_1.Block;
+var script_1 = require("./script");
+exports.opcodes = script_1.OPS;
+var transaction_1 = require("./transaction");
+exports.Transaction = transaction_1.Transaction;
+var transaction_builder_1 = require("./transaction_builder");
+exports.TransactionBuilder = transaction_builder_1.TransactionBuilder;

src/networks.js

@@ -1,38 +1,35 @@
-// https://en.bitcoin.it/wiki/List_of_address_prefixes
-// Dogecoin BIP32 is a proposed standard: https://bitcointalk.org/index.php?topic=409731
-
-module.exports = {
-  bitcoin: {
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.bitcoin = {
     messagePrefix: '\x18Bitcoin Signed Message:\n',
     bech32: 'bc',
     bip32: {
         public: 0x0488b21e,
-      private: 0x0488ade4
+        private: 0x0488ade4,
     },
     pubKeyHash: 0x00,
     scriptHash: 0x05,
-    wif: 0x80
-  },
-  regtest: {
+    wif: 0x80,
+};
+exports.regtest = {
     messagePrefix: '\x18Bitcoin Signed Message:\n',
     bech32: 'bcrt',
     bip32: {
         public: 0x043587cf,
-      private: 0x04358394
+        private: 0x04358394,
     },
     pubKeyHash: 0x6f,
     scriptHash: 0xc4,
-    wif: 0xef
-  },
-  testnet: {
+    wif: 0xef,
+};
+exports.testnet = {
     messagePrefix: '\x18Bitcoin Signed Message:\n',
     bech32: 'tb',
     bip32: {
         public: 0x043587cf,
-      private: 0x04358394
+        private: 0x04358394,
     },
     pubKeyHash: 0x6f,
     scriptHash: 0xc4,
-    wif: 0xef
-  }
-}
+    wif: 0xef,
+};

src/payments/embed.js

@@ -1,56 +1,51 @@
-const lazy = require('./lazy')
-const typef = require('typeforce')
-const OPS = require('bitcoin-ops')
-
-const bscript = require('../script')
-const BITCOIN_NETWORK = require('../networks').bitcoin
-
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const networks_1 = require("../networks");
+const bscript = require("../script");
+const lazy = require("./lazy");
+const typef = require('typeforce');
+const OPS = bscript.OPS;
 function stacksEqual(a, b) {
-  if (a.length !== b.length) return false
-
-  return a.every(function (x, i) {
-    return x.equals(b[i])
-  })
+    if (a.length !== b.length)
+        return false;
+    return a.every((x, i) => {
+        return x.equals(b[i]);
+    });
 }
-
 // output: OP_RETURN ...
 function p2data(a, opts) {
-  if (
-    !a.data &&
-    !a.output
-  ) throw new TypeError('Not enough data')
-  opts = Object.assign({ validate: true }, opts || {})
-
+    if (!a.data && !a.output)
+        throw new TypeError('Not enough data');
+    opts = Object.assign({ validate: true }, opts || {});
     typef({
         network: typef.maybe(typef.Object),
         output: typef.maybe(typef.Buffer),
-    data: typef.maybe(typef.arrayOf(typef.Buffer))
-  }, a)
-
-  const network = a.network || BITCOIN_NETWORK
-  const o = { network }
-
-  lazy.prop(o, 'output', function () {
-    if (!a.data) return
-    return bscript.compile([OPS.OP_RETURN].concat(a.data))
-  })
-  lazy.prop(o, 'data', function () {
-    if (!a.output) return
-    return bscript.decompile(a.output).slice(1)
-  })
-
+        data: typef.maybe(typef.arrayOf(typef.Buffer)),
+    }, a);
+    const network = a.network || networks_1.bitcoin;
+    const o = { network };
+    lazy.prop(o, 'output', () => {
+        if (!a.data)
+            return;
+        return bscript.compile([OPS.OP_RETURN].concat(a.data));
+    });
+    lazy.prop(o, 'data', () => {
+        if (!a.output)
+            return;
+        return bscript.decompile(a.output).slice(1);
+    });
     // extended validation
     if (opts.validate) {
         if (a.output) {
-      const chunks = bscript.decompile(a.output)
-      if (chunks[0] !== OPS.OP_RETURN) throw new TypeError('Output is invalid')
-      if (!chunks.slice(1).every(typef.Buffer)) throw new TypeError('Output is invalid')
-
-      if (a.data && !stacksEqual(a.data, o.data)) throw new TypeError('Data mismatch')
+            const chunks = bscript.decompile(a.output);
+            if (chunks[0] !== OPS.OP_RETURN)
+                throw new TypeError('Output is invalid');
+            if (!chunks.slice(1).every(typef.Buffer))
+                throw new TypeError('Output is invalid');
+            if (a.data && !stacksEqual(a.data, o.data))
+                throw new TypeError('Data mismatch');
         }
     }
-
-  return Object.assign(o, a)
+    return Object.assign(o, a);
 }
-
-module.exports = p2data
+exports.p2data = p2data;

src/payments/index.js

@@ -1,12 +1,18 @@
-const embed = require('./embed')
-const p2ms = require('./p2ms')
-const p2pk = require('./p2pk')
-const p2pkh = require('./p2pkh')
-const p2sh = require('./p2sh')
-const p2wpkh = require('./p2wpkh')
-const p2wsh = require('./p2wsh')
-
-module.exports = { embed, p2ms, p2pk, p2pkh, p2sh, p2wpkh, p2wsh }
-
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const embed_1 = require("./embed");
+exports.embed = embed_1.p2data;
+const p2ms_1 = require("./p2ms");
+exports.p2ms = p2ms_1.p2ms;
+const p2pk_1 = require("./p2pk");
+exports.p2pk = p2pk_1.p2pk;
+const p2pkh_1 = require("./p2pkh");
+exports.p2pkh = p2pkh_1.p2pkh;
+const p2sh_1 = require("./p2sh");
+exports.p2sh = p2sh_1.p2sh;
+const p2wpkh_1 = require("./p2wpkh");
+exports.p2wpkh = p2wpkh_1.p2wpkh;
+const p2wsh_1 = require("./p2wsh");
+exports.p2wsh = p2wsh_1.p2wsh;
 // TODO
 // witness commitment

src/payments/lazy.js

@@ -1,30 +1,32 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
 function prop(object, name, f) {
     Object.defineProperty(object, name, {
         configurable: true,
         enumerable: true,
-    get: function () {
-      let value = f.call(this)
-      this[name] = value
-      return value
+        get() {
+            const _value = f.call(this);
+            this[name] = _value;
+            return _value;
         },
-    set: function (value) {
+        set(_value) {
             Object.defineProperty(this, name, {
                 configurable: true,
                 enumerable: true,
-        value: value,
-        writable: true
-      })
+                value: _value,
+                writable: true,
+            });
+        },
+    });
 }
-  })
-}
-
+exports.prop = prop;
 function value(f) {
-  let value
-  return function () {
-    if (value !== undefined) return value
-    value = f()
-    return value
+    let _value;
+    return () => {
+        if (_value !== undefined)
+            return _value;
+        _value = f();
+        return _value;
+    };
 }
-}
-
-module.exports = { prop, value }
+exports.value = value;

src/payments/p2ms.js

@@ -1,140 +1,141 @@
-const lazy = require('./lazy')
-const typef = require('typeforce')
-const OPS = require('bitcoin-ops')
-const ecc = require('tiny-secp256k1')
-
-const bscript = require('../script')
-const BITCOIN_NETWORK = require('../networks').bitcoin
-const OP_INT_BASE = OPS.OP_RESERVED // OP_1 - 1
-
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const networks_1 = require("../networks");
+const bscript = require("../script");
+const lazy = require("./lazy");
+const OPS = bscript.OPS;
+const typef = require('typeforce');
+const ecc = require('tiny-secp256k1');
+const OP_INT_BASE = OPS.OP_RESERVED; // OP_1 - 1
 function stacksEqual(a, b) {
-  if (a.length !== b.length) return false
-
-  return a.every(function (x, i) {
-    return x.equals(b[i])
-  })
+    if (a.length !== b.length)
+        return false;
+    return a.every((x, i) => {
+        return x.equals(b[i]);
+    });
 }
-
 // input: OP_0 [signatures ...]
 // output: m [pubKeys ...] n OP_CHECKMULTISIG
 function p2ms(a, opts) {
-  if (
-    !a.input &&
+    if (!a.input &&
         !a.output &&
         !(a.pubkeys && a.m !== undefined) &&
-    !a.signatures
-  ) throw new TypeError('Not enough data')
-  opts = Object.assign({ validate: true }, opts || {})
-
+        !a.signatures)
+        throw new TypeError('Not enough data');
+    opts = Object.assign({ validate: true }, opts || {});
     function isAcceptableSignature(x) {
-    return bscript.isCanonicalScriptSignature(x) || (opts.allowIncomplete && (x === OPS.OP_0))
+        return (bscript.isCanonicalScriptSignature(x) ||
+            (opts.allowIncomplete && x === OPS.OP_0) !== undefined);
     }
-
     typef({
         network: typef.maybe(typef.Object),
         m: typef.maybe(typef.Number),
         n: typef.maybe(typef.Number),
         output: typef.maybe(typef.Buffer),
         pubkeys: typef.maybe(typef.arrayOf(ecc.isPoint)),
-
         signatures: typef.maybe(typef.arrayOf(isAcceptableSignature)),
-    input: typef.maybe(typef.Buffer)
-  }, a)
-
-  const network = a.network || BITCOIN_NETWORK
-  const o = { network }
-
-  let chunks
-  let decoded = false
+        input: typef.maybe(typef.Buffer),
+    }, a);
+    const network = a.network || networks_1.bitcoin;
+    const o = { network };
+    let chunks = [];
+    let decoded = false;
     function decode(output) {
-    if (decoded) return
-    decoded = true
-    chunks = bscript.decompile(output)
-    o.m = chunks[0] - OP_INT_BASE
-    o.n = chunks[chunks.length - 2] - OP_INT_BASE
-    o.pubkeys = chunks.slice(1, -2)
+        if (decoded)
+            return;
+        decoded = true;
+        chunks = bscript.decompile(output);
+        o.m = chunks[0] - OP_INT_BASE;
+        o.n = chunks[chunks.length - 2] - OP_INT_BASE;
+        o.pubkeys = chunks.slice(1, -2);
     }
-
-  lazy.prop(o, 'output', function () {
-    if (!a.m) return
-    if (!o.n) return
-    if (!a.pubkeys) return
-    return bscript.compile([].concat(
-      OP_INT_BASE + a.m,
-      a.pubkeys,
-      OP_INT_BASE + o.n,
-      OPS.OP_CHECKMULTISIG
-    ))
-  })
-  lazy.prop(o, 'm', function () {
-    if (!o.output) return
-    decode(o.output)
-    return o.m
-  })
-  lazy.prop(o, 'n', function () {
-    if (!o.pubkeys) return
-    return o.pubkeys.length
-  })
-  lazy.prop(o, 'pubkeys', function () {
-    if (!a.output) return
-    decode(a.output)
-    return o.pubkeys
-  })
-  lazy.prop(o, 'signatures', function () {
-    if (!a.input) return
-    return bscript.decompile(a.input).slice(1)
-  })
-  lazy.prop(o, 'input', function () {
-    if (!a.signatures) return
-    return bscript.compile([OPS.OP_0].concat(a.signatures))
-  })
-  lazy.prop(o, 'witness', function () {
-    if (!o.input) return
-    return []
-  })
-
+    lazy.prop(o, 'output', () => {
+        if (!a.m)
+            return;
+        if (!o.n)
+            return;
+        if (!a.pubkeys)
+            return;
+        return bscript.compile([].concat(OP_INT_BASE + a.m, a.pubkeys, OP_INT_BASE + o.n, OPS.OP_CHECKMULTISIG));
+    });
+    lazy.prop(o, 'm', () => {
+        if (!o.output)
+            return;
+        decode(o.output);
+        return o.m;
+    });
+    lazy.prop(o, 'n', () => {
+        if (!o.pubkeys)
+            return;
+        return o.pubkeys.length;
+    });
+    lazy.prop(o, 'pubkeys', () => {
+        if (!a.output)
+            return;
+        decode(a.output);
+        return o.pubkeys;
+    });
+    lazy.prop(o, 'signatures', () => {
+        if (!a.input)
+            return;
+        return bscript.decompile(a.input).slice(1);
+    });
+    lazy.prop(o, 'input', () => {
+        if (!a.signatures)
+            return;
+        return bscript.compile([OPS.OP_0].concat(a.signatures));
+    });
+    lazy.prop(o, 'witness', () => {
+        if (!o.input)
+            return;
+        return [];
+    });
     // extended validation
     if (opts.validate) {
         if (a.output) {
-      decode(a.output)
-      if (!typef.Number(chunks[0])) throw new TypeError('Output is invalid')
-      if (!typef.Number(chunks[chunks.length - 2])) throw new TypeError('Output is invalid')
-      if (chunks[chunks.length - 1] !== OPS.OP_CHECKMULTISIG) throw new TypeError('Output is invalid')
-
-      if (
-        o.m <= 0 ||
-        o.n > 16 ||
-        o.m > o.n ||
-        o.n !== chunks.length - 3) throw new TypeError('Output is invalid')
-      if (!o.pubkeys.every(x => ecc.isPoint(x))) throw new TypeError('Output is invalid')
-
-      if (a.m !== undefined && a.m !== o.m) throw new TypeError('m mismatch')
-      if (a.n !== undefined && a.n !== o.n) throw new TypeError('n mismatch')
-      if (a.pubkeys && !stacksEqual(a.pubkeys, o.pubkeys)) throw new TypeError('Pubkeys mismatch')
+            decode(a.output);
+            if (!typef.Number(chunks[0]))
+                throw new TypeError('Output is invalid');
+            if (!typef.Number(chunks[chunks.length - 2]))
+                throw new TypeError('Output is invalid');
+            if (chunks[chunks.length - 1] !== OPS.OP_CHECKMULTISIG)
+                throw new TypeError('Output is invalid');
+            if (o.m <= 0 || o.n > 16 || o.m > o.n || o.n !== chunks.length - 3)
+                throw new TypeError('Output is invalid');
+            if (!o.pubkeys.every(x => ecc.isPoint(x)))
+                throw new TypeError('Output is invalid');
+            if (a.m !== undefined && a.m !== o.m)
+                throw new TypeError('m mismatch');
+            if (a.n !== undefined && a.n !== o.n)
+                throw new TypeError('n mismatch');
+            if (a.pubkeys && !stacksEqual(a.pubkeys, o.pubkeys))
+                throw new TypeError('Pubkeys mismatch');
         }
-
         if (a.pubkeys) {
-      if (a.n !== undefined && a.n !== a.pubkeys.length) throw new TypeError('Pubkey count mismatch')
-      o.n = a.pubkeys.length
-
-      if (o.n < o.m) throw new TypeError('Pubkey count cannot be less than m')
+            if (a.n !== undefined && a.n !== a.pubkeys.length)
+                throw new TypeError('Pubkey count mismatch');
+            o.n = a.pubkeys.length;
+            if (o.n < o.m)
+                throw new TypeError('Pubkey count cannot be less than m');
         }
-
         if (a.signatures) {
-      if (a.signatures.length < o.m) throw new TypeError('Not enough signatures provided')
-      if (a.signatures.length > o.m) throw new TypeError('Too many signatures provided')
+            if (a.signatures.length < o.m)
+                throw new TypeError('Not enough signatures provided');
+            if (a.signatures.length > o.m)
+                throw new TypeError('Too many signatures provided');
         }
-
         if (a.input) {
-      if (a.input[0] !== OPS.OP_0) throw new TypeError('Input is invalid')
-      if (o.signatures.length === 0 || !o.signatures.every(isAcceptableSignature)) throw new TypeError('Input has invalid signature(s)')
-
-      if (a.signatures && !stacksEqual(a.signatures, o.signatures)) throw new TypeError('Signature mismatch')
-      if (a.m !== undefined && a.m !== a.signatures.length) throw new TypeError('Signature count mismatch')
+            if (a.input[0] !== OPS.OP_0)
+                throw new TypeError('Input is invalid');
+            if (o.signatures.length === 0 ||
+                !o.signatures.every(isAcceptableSignature))
+                throw new TypeError('Input has invalid signature(s)');
+            if (a.signatures && !stacksEqual(a.signatures, o.signatures))
+                throw new TypeError('Signature mismatch');
+            if (a.m !== undefined && a.m !== a.signatures.length)
+                throw new TypeError('Signature count mismatch');
         }
     }
-
-  return Object.assign(o, a)
+    return Object.assign(o, a);
 }
-
-module.exports = p2ms
+exports.p2ms = p2ms;

src/payments/p2pk.js

@@ -1,80 +1,75 @@
-const lazy = require('./lazy')
-const typef = require('typeforce')
-const OPS = require('bitcoin-ops')
-const ecc = require('tiny-secp256k1')
-
-const bscript = require('../script')
-const BITCOIN_NETWORK = require('../networks').bitcoin
-
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const networks_1 = require("../networks");
+const bscript = require("../script");
+const lazy = require("./lazy");
+const typef = require('typeforce');
+const OPS = bscript.OPS;
+const ecc = require('tiny-secp256k1');
 // input: {signature}
 // output: {pubKey} OP_CHECKSIG
 function p2pk(a, opts) {
-  if (
-    !a.input &&
-    !a.output &&
-    !a.pubkey &&
-    !a.input &&
-    !a.signature
-  ) throw new TypeError('Not enough data')
-  opts = Object.assign({ validate: true }, opts || {})
-
+    if (!a.input && !a.output && !a.pubkey && !a.input && !a.signature)
+        throw new TypeError('Not enough data');
+    opts = Object.assign({ validate: true }, opts || {});
     typef({
         network: typef.maybe(typef.Object),
         output: typef.maybe(typef.Buffer),
         pubkey: typef.maybe(ecc.isPoint),
-
         signature: typef.maybe(bscript.isCanonicalScriptSignature),
-    input: typef.maybe(typef.Buffer)
-  }, a)
-
-  const _chunks = lazy.value(function () { return bscript.decompile(a.input) })
-
-  const network = a.network || BITCOIN_NETWORK
-  const o = { network }
-
-  lazy.prop(o, 'output', function () {
-    if (!a.pubkey) return
-    return bscript.compile([
-      a.pubkey,
-      OPS.OP_CHECKSIG
-    ])
-  })
-  lazy.prop(o, 'pubkey', function () {
-    if (!a.output) return
-    return a.output.slice(1, -1)
-  })
-  lazy.prop(o, 'signature', function () {
-    if (!a.input) return
-    return _chunks()[0]
-  })
-  lazy.prop(o, 'input', function () {
-    if (!a.signature) return
-    return bscript.compile([a.signature])
-  })
-  lazy.prop(o, 'witness', function () {
-    if (!o.input) return
-    return []
-  })
-
+        input: typef.maybe(typef.Buffer),
+    }, a);
+    const _chunks = lazy.value(() => {
+        return bscript.decompile(a.input);
+    });
+    const network = a.network || networks_1.bitcoin;
+    const o = { network };
+    lazy.prop(o, 'output', () => {
+        if (!a.pubkey)
+            return;
+        return bscript.compile([a.pubkey, OPS.OP_CHECKSIG]);
+    });
+    lazy.prop(o, 'pubkey', () => {
+        if (!a.output)
+            return;
+        return a.output.slice(1, -1);
+    });
+    lazy.prop(o, 'signature', () => {
+        if (!a.input)
+            return;
+        return _chunks()[0];
+    });
+    lazy.prop(o, 'input', () => {
+        if (!a.signature)
+            return;
+        return bscript.compile([a.signature]);
+    });
+    lazy.prop(o, 'witness', () => {
+        if (!o.input)
+            return;
+        return [];
+    });
     // extended validation
     if (opts.validate) {
         if (a.output) {
-      if (a.output[a.output.length - 1] !== OPS.OP_CHECKSIG) throw new TypeError('Output is invalid')
-      if (!ecc.isPoint(o.pubkey)) throw new TypeError('Output pubkey is invalid')
-      if (a.pubkey && !a.pubkey.equals(o.pubkey)) throw new TypeError('Pubkey mismatch')
+            if (a.output[a.output.length - 1] !== OPS.OP_CHECKSIG)
+                throw new TypeError('Output is invalid');
+            if (!ecc.isPoint(o.pubkey))
+                throw new TypeError('Output pubkey is invalid');
+            if (a.pubkey && !a.pubkey.equals(o.pubkey))
+                throw new TypeError('Pubkey mismatch');
         }
-
         if (a.signature) {
-      if (a.input && !a.input.equals(o.input)) throw new TypeError('Signature mismatch')
+            if (a.input && !a.input.equals(o.input))
+                throw new TypeError('Signature mismatch');
         }
-
         if (a.input) {
-      if (_chunks().length !== 1) throw new TypeError('Input is invalid')
-      if (!bscript.isCanonicalScriptSignature(o.signature)) throw new TypeError('Input has invalid signature')
+            if (_chunks().length !== 1)
+                throw new TypeError('Input is invalid');
+            if (!bscript.isCanonicalScriptSignature(o.signature))
+                throw new TypeError('Input has invalid signature');
         }
     }
-
-  return Object.assign(o, a)
+    return Object.assign(o, a);
 }
-
-module.exports = p2pk
+exports.p2pk = p2pk;

src/payments/p2pkh.js

@@ -1,137 +1,142 @@
-const lazy = require('./lazy')
-const typef = require('typeforce')
-const OPS = require('bitcoin-ops')
-const ecc = require('tiny-secp256k1')
-
-const bcrypto = require('../crypto')
-const bscript = require('../script')
-const BITCOIN_NETWORK = require('../networks').bitcoin
-const bs58check = require('bs58check')
-
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const bcrypto = require("../crypto");
+const networks_1 = require("../networks");
+const bscript = require("../script");
+const lazy = require("./lazy");
+const typef = require('typeforce');
+const OPS = bscript.OPS;
+const ecc = require('tiny-secp256k1');
+const bs58check = require('bs58check');
 // input: {signature} {pubkey}
 // output: OP_DUP OP_HASH160 {hash160(pubkey)} OP_EQUALVERIFY OP_CHECKSIG
 function p2pkh(a, opts) {
-  if (
-    !a.address &&
-    !a.hash &&
-    !a.output &&
-    !a.pubkey &&
-    !a.input
-  ) throw new TypeError('Not enough data')
-  opts = Object.assign({ validate: true }, opts || {})
-
+    if (!a.address && !a.hash && !a.output && !a.pubkey && !a.input)
+        throw new TypeError('Not enough data');
+    opts = Object.assign({ validate: true }, opts || {});
     typef({
         network: typef.maybe(typef.Object),
         address: typef.maybe(typef.String),
         hash: typef.maybe(typef.BufferN(20)),
         output: typef.maybe(typef.BufferN(25)),
-
         pubkey: typef.maybe(ecc.isPoint),
         signature: typef.maybe(bscript.isCanonicalScriptSignature),
-    input: typef.maybe(typef.Buffer)
-  }, a)
-
-  const _address = lazy.value(function () {
-    const payload = bs58check.decode(a.address)
-    const version = payload.readUInt8(0)
-    const hash = payload.slice(1)
-    return { version, hash }
-  })
-  const _chunks = lazy.value(function () { return bscript.decompile(a.input) })
-
-  const network = a.network || BITCOIN_NETWORK
-  const o = { network }
-
-  lazy.prop(o, 'address', function () {
-    if (!o.hash) return
-
-    const payload = Buffer.allocUnsafe(21)
-    payload.writeUInt8(network.pubKeyHash, 0)
-    o.hash.copy(payload, 1)
-    return bs58check.encode(payload)
-  })
-  lazy.prop(o, 'hash', function () {
-    if (a.output) return a.output.slice(3, 23)
-    if (a.address) return _address().hash
-    if (a.pubkey || o.pubkey) return bcrypto.hash160(a.pubkey || o.pubkey)
-  })
-  lazy.prop(o, 'output', function () {
-    if (!o.hash) return
+        input: typef.maybe(typef.Buffer),
+    }, a);
+    const _address = lazy.value(() => {
+        const payload = bs58check.decode(a.address);
+        const version = payload.readUInt8(0);
+        const hash = payload.slice(1);
+        return { version, hash };
+    });
+    const _chunks = lazy.value(() => {
+        return bscript.decompile(a.input);
+    });
+    const network = a.network || networks_1.bitcoin;
+    const o = { network };
+    lazy.prop(o, 'address', () => {
+        if (!o.hash)
+            return;
+        const payload = Buffer.allocUnsafe(21);
+        payload.writeUInt8(network.pubKeyHash, 0);
+        o.hash.copy(payload, 1);
+        return bs58check.encode(payload);
+    });
+    lazy.prop(o, 'hash', () => {
+        if (a.output)
+            return a.output.slice(3, 23);
+        if (a.address)
+            return _address().hash;
+        if (a.pubkey || o.pubkey)
+            return bcrypto.hash160(a.pubkey || o.pubkey);
+    });
+    lazy.prop(o, 'output', () => {
+        if (!o.hash)
+            return;
         return bscript.compile([
             OPS.OP_DUP,
             OPS.OP_HASH160,
             o.hash,
             OPS.OP_EQUALVERIFY,
-      OPS.OP_CHECKSIG
-    ])
-  })
-  lazy.prop(o, 'pubkey', function () {
-    if (!a.input) return
-    return _chunks()[1]
-  })
-  lazy.prop(o, 'signature', function () {
-    if (!a.input) return
-    return _chunks()[0]
-  })
-  lazy.prop(o, 'input', function () {
-    if (!a.pubkey) return
-    if (!a.signature) return
-    return bscript.compile([a.signature, a.pubkey])
-  })
-  lazy.prop(o, 'witness', function () {
-    if (!o.input) return
-    return []
-  })
-
+            OPS.OP_CHECKSIG,
+        ]);
+    });
+    lazy.prop(o, 'pubkey', () => {
+        if (!a.input)
+            return;
+        return _chunks()[1];
+    });
+    lazy.prop(o, 'signature', () => {
+        if (!a.input)
+            return;
+        return _chunks()[0];
+    });
+    lazy.prop(o, 'input', () => {
+        if (!a.pubkey)
+            return;
+        if (!a.signature)
+            return;
+        return bscript.compile([a.signature, a.pubkey]);
+    });
+    lazy.prop(o, 'witness', () => {
+        if (!o.input)
+            return;
+        return [];
+    });
     // extended validation
     if (opts.validate) {
-    let hash
+        let hash = Buffer.from([]);
         if (a.address) {
-      if (_address().version !== network.pubKeyHash) throw new TypeError('Invalid version or Network mismatch')
-      if (_address().hash.length !== 20) throw new TypeError('Invalid address')
-      hash = _address().hash
+            if (_address().version !== network.pubKeyHash)
+                throw new TypeError('Invalid version or Network mismatch');
+            if (_address().hash.length !== 20)
+                throw new TypeError('Invalid address');
+            hash = _address().hash;
         }
-
         if (a.hash) {
-      if (hash && !hash.equals(a.hash)) throw new TypeError('Hash mismatch')
-      else hash = a.hash
+            if (hash.length > 0 && !hash.equals(a.hash))
+                throw new TypeError('Hash mismatch');
+            else
+                hash = a.hash;
         }
-
         if (a.output) {
-      if (
-        a.output.length !== 25 ||
+            if (a.output.length !== 25 ||
                 a.output[0] !== OPS.OP_DUP ||
                 a.output[1] !== OPS.OP_HASH160 ||
                 a.output[2] !== 0x14 ||
                 a.output[23] !== OPS.OP_EQUALVERIFY ||
-        a.output[24] !== OPS.OP_CHECKSIG) throw new TypeError('Output is invalid')
-
-      const hash2 = a.output.slice(3, 23)
-      if (hash && !hash.equals(hash2)) throw new TypeError('Hash mismatch')
-      else hash = hash2
+                a.output[24] !== OPS.OP_CHECKSIG)
+                throw new TypeError('Output is invalid');
+            const hash2 = a.output.slice(3, 23);
+            if (hash.length > 0 && !hash.equals(hash2))
+                throw new TypeError('Hash mismatch');
+            else
+                hash = hash2;
         }
-
         if (a.pubkey) {
-      const pkh = bcrypto.hash160(a.pubkey)
-      if (hash && !hash.equals(pkh)) throw new TypeError('Hash mismatch')
-      else hash = pkh
+            const pkh = bcrypto.hash160(a.pubkey);
+            if (hash.length > 0 && !hash.equals(pkh))
+                throw new TypeError('Hash mismatch');
+            else
+                hash = pkh;
         }
-
         if (a.input) {
-      const chunks = _chunks()
-      if (chunks.length !== 2) throw new TypeError('Input is invalid')
-      if (!bscript.isCanonicalScriptSignature(chunks[0])) throw new TypeError('Input has invalid signature')
-      if (!ecc.isPoint(chunks[1])) throw new TypeError('Input has invalid pubkey')
-
-      if (a.signature && !a.signature.equals(chunks[0])) throw new TypeError('Signature mismatch')
-      if (a.pubkey && !a.pubkey.equals(chunks[1])) throw new TypeError('Pubkey mismatch')
-
-      const pkh = bcrypto.hash160(chunks[1])
-      if (hash && !hash.equals(pkh)) throw new TypeError('Hash mismatch')
+            const chunks = _chunks();
+            if (chunks.length !== 2)
+                throw new TypeError('Input is invalid');
+            if (!bscript.isCanonicalScriptSignature(chunks[0]))
+                throw new TypeError('Input has invalid signature');
+            if (!ecc.isPoint(chunks[1]))
+                throw new TypeError('Input has invalid pubkey');
+            if (a.signature && !a.signature.equals(chunks[0]))
+                throw new TypeError('Signature mismatch');
+            if (a.pubkey && !a.pubkey.equals(chunks[1]))
+                throw new TypeError('Pubkey mismatch');
+            const pkh = bcrypto.hash160(chunks[1]);
+            if (hash.length > 0 && !hash.equals(pkh))
+                throw new TypeError('Hash mismatch');
         }
     }
-
-  return Object.assign(o, a)
+    return Object.assign(o, a);
 }
-
-module.exports = p2pkh
+exports.p2pkh = p2pkh;

src/payments/p2sh.js

@@ -1,193 +1,185 @@
-const lazy = require('./lazy')
-const typef = require('typeforce')
-const OPS = require('bitcoin-ops')
-
-const bcrypto = require('../crypto')
-const bscript = require('../script')
-const BITCOIN_NETWORK = require('../networks').bitcoin
-const bs58check = require('bs58check')
-
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const bcrypto = require("../crypto");
+const networks_1 = require("../networks");
+const bscript = require("../script");
+const lazy = require("./lazy");
+const typef = require('typeforce');
+const OPS = bscript.OPS;
+const bs58check = require('bs58check');
 function stacksEqual(a, b) {
-  if (a.length !== b.length) return false
-
-  return a.every(function (x, i) {
-    return x.equals(b[i])
-  })
+    if (a.length !== b.length)
+        return false;
+    return a.every((x, i) => {
+        return x.equals(b[i]);
+    });
 }
-
 // input: [redeemScriptSig ...] {redeemScript}
 // witness: <?>
 // output: OP_HASH160 {hash160(redeemScript)} OP_EQUAL
 function p2sh(a, opts) {
-  if (
-    !a.address &&
-    !a.hash &&
-    !a.output &&
-    !a.redeem &&
-    !a.input
-  ) throw new TypeError('Not enough data')
-  opts = Object.assign({ validate: true }, opts || {})
-
+    if (!a.address && !a.hash && !a.output && !a.redeem && !a.input)
+        throw new TypeError('Not enough data');
+    opts = Object.assign({ validate: true }, opts || {});
     typef({
         network: typef.maybe(typef.Object),
-
         address: typef.maybe(typef.String),
         hash: typef.maybe(typef.BufferN(20)),
         output: typef.maybe(typef.BufferN(23)),
-
         redeem: typef.maybe({
             network: typef.maybe(typef.Object),
             output: typef.maybe(typef.Buffer),
             input: typef.maybe(typef.Buffer),
-      witness: typef.maybe(typef.arrayOf(typef.Buffer))
+            witness: typef.maybe(typef.arrayOf(typef.Buffer)),
         }),
         input: typef.maybe(typef.Buffer),
-    witness: typef.maybe(typef.arrayOf(typef.Buffer))
-  }, a)
-
-  let network = a.network
+        witness: typef.maybe(typef.arrayOf(typef.Buffer)),
+    }, a);
+    let network = a.network;
     if (!network) {
-    network = (a.redeem && a.redeem.network) || BITCOIN_NETWORK
+        network = (a.redeem && a.redeem.network) || networks_1.bitcoin;
     }
-
-  const o = { network }
-
-  const _address = lazy.value(function () {
-    const payload = bs58check.decode(a.address)
-    const version = payload.readUInt8(0)
-    const hash = payload.slice(1)
-    return { version, hash }
-  })
-  const _chunks = lazy.value(function () { return bscript.decompile(a.input) })
-  const _redeem = lazy.value(function () {
-    const chunks = _chunks()
+    const o = { network };
+    const _address = lazy.value(() => {
+        const payload = bs58check.decode(a.address);
+        const version = payload.readUInt8(0);
+        const hash = payload.slice(1);
+        return { version, hash };
+    });
+    const _chunks = lazy.value(() => {
+        return bscript.decompile(a.input);
+    });
+    const _redeem = lazy.value(() => {
+        const chunks = _chunks();
         return {
             network,
             output: chunks[chunks.length - 1],
             input: bscript.compile(chunks.slice(0, -1)),
-      witness: a.witness || []
-    }
-  })
-
+            witness: a.witness || [],
+        };
+    });
     // output dependents
-  lazy.prop(o, 'address', function () {
-    if (!o.hash) return
-
-    const payload = Buffer.allocUnsafe(21)
-    payload.writeUInt8(network.scriptHash, 0)
-    o.hash.copy(payload, 1)
-    return bs58check.encode(payload)
-  })
-  lazy.prop(o, 'hash', function () {
+    lazy.prop(o, 'address', () => {
+        if (!o.hash)
+            return;
+        const payload = Buffer.allocUnsafe(21);
+        payload.writeUInt8(o.network.scriptHash, 0);
+        o.hash.copy(payload, 1);
+        return bs58check.encode(payload);
+    });
+    lazy.prop(o, 'hash', () => {
         // in order of least effort
-    if (a.output) return a.output.slice(2, 22)
-    if (a.address) return _address().hash
-    if (o.redeem && o.redeem.output) return bcrypto.hash160(o.redeem.output)
-  })
-  lazy.prop(o, 'output', function () {
-    if (!o.hash) return
-    return bscript.compile([
-      OPS.OP_HASH160,
-      o.hash,
-      OPS.OP_EQUAL
-    ])
-  })
-
+        if (a.output)
+            return a.output.slice(2, 22);
+        if (a.address)
+            return _address().hash;
+        if (o.redeem && o.redeem.output)
+            return bcrypto.hash160(o.redeem.output);
+    });
+    lazy.prop(o, 'output', () => {
+        if (!o.hash)
+            return;
+        return bscript.compile([OPS.OP_HASH160, o.hash, OPS.OP_EQUAL]);
+    });
     // input dependents
-  lazy.prop(o, 'redeem', function () {
-    if (!a.input) return
-    return _redeem()
-  })
-  lazy.prop(o, 'input', function () {
-    if (!a.redeem || !a.redeem.input || !a.redeem.output) return
-    return bscript.compile([].concat(
-      bscript.decompile(a.redeem.input),
-      a.redeem.output
-    ))
-  })
-  lazy.prop(o, 'witness', function () {
-    if (o.redeem && o.redeem.witness) return o.redeem.witness
-    if (o.input) return []
-  })
-
+    lazy.prop(o, 'redeem', () => {
+        if (!a.input)
+            return;
+        return _redeem();
+    });
+    lazy.prop(o, 'input', () => {
+        if (!a.redeem || !a.redeem.input || !a.redeem.output)
+            return;
+        return bscript.compile([].concat(bscript.decompile(a.redeem.input), a.redeem.output));
+    });
+    lazy.prop(o, 'witness', () => {
+        if (o.redeem && o.redeem.witness)
+            return o.redeem.witness;
+        if (o.input)
+            return [];
+    });
     if (opts.validate) {
-    let hash
+        let hash = Buffer.from([]);
         if (a.address) {
-      if (_address().version !== network.scriptHash) throw new TypeError('Invalid version or Network mismatch')
-      if (_address().hash.length !== 20) throw new TypeError('Invalid address')
-      hash = _address().hash
+            if (_address().version !== network.scriptHash)
+                throw new TypeError('Invalid version or Network mismatch');
+            if (_address().hash.length !== 20)
+                throw new TypeError('Invalid address');
+            hash = _address().hash;
         }
-
         if (a.hash) {
-      if (hash && !hash.equals(a.hash)) throw new TypeError('Hash mismatch')
-      else hash = a.hash
+            if (hash.length > 0 && !hash.equals(a.hash))
+                throw new TypeError('Hash mismatch');
+            else
+                hash = a.hash;
         }
-
         if (a.output) {
-      if (
-        a.output.length !== 23 ||
+            if (a.output.length !== 23 ||
                 a.output[0] !== OPS.OP_HASH160 ||
                 a.output[1] !== 0x14 ||
-        a.output[22] !== OPS.OP_EQUAL) throw new TypeError('Output is invalid')
-
-      const hash2 = a.output.slice(2, 22)
-      if (hash && !hash.equals(hash2)) throw new TypeError('Hash mismatch')
-      else hash = hash2
+                a.output[22] !== OPS.OP_EQUAL)
+                throw new TypeError('Output is invalid');
+            const hash2 = a.output.slice(2, 22);
+            if (hash.length > 0 && !hash.equals(hash2))
+                throw new TypeError('Hash mismatch');
+            else
+                hash = hash2;
         }
-
         // inlined to prevent 'no-inner-declarations' failing
-    const checkRedeem = function (redeem) {
+        const checkRedeem = (redeem) => {
             // is the redeem output empty/invalid?
             if (redeem.output) {
-        const decompile = bscript.decompile(redeem.output)
-        if (!decompile || decompile.length < 1) throw new TypeError('Redeem.output too short')
-
+                const decompile = bscript.decompile(redeem.output);
+                if (!decompile || decompile.length < 1)
+                    throw new TypeError('Redeem.output too short');
                 // match hash against other sources
-        const hash2 = bcrypto.hash160(redeem.output)
-        if (hash && !hash.equals(hash2)) throw new TypeError('Hash mismatch')
-        else hash = hash2
+                const hash2 = bcrypto.hash160(redeem.output);
+                if (hash.length > 0 && !hash.equals(hash2))
+                    throw new TypeError('Hash mismatch');
+                else
+                    hash = hash2;
             }
-
             if (redeem.input) {
-        const hasInput = redeem.input.length > 0
-        const hasWitness = redeem.witness && redeem.witness.length > 0
-        if (!hasInput && !hasWitness) throw new TypeError('Empty input')
-        if (hasInput && hasWitness) throw new TypeError('Input and witness provided')
+                const hasInput = redeem.input.length > 0;
+                const hasWitness = redeem.witness && redeem.witness.length > 0;
+                if (!hasInput && !hasWitness)
+                    throw new TypeError('Empty input');
+                if (hasInput && hasWitness)
+                    throw new TypeError('Input and witness provided');
                 if (hasInput) {
-          const richunks = bscript.decompile(redeem.input)
-          if (!bscript.isPushOnly(richunks)) throw new TypeError('Non push-only scriptSig')
+                    const richunks = bscript.decompile(redeem.input);
+                    if (!bscript.isPushOnly(richunks))
+                        throw new TypeError('Non push-only scriptSig');
                 }
             }
-    }
-
+        };
         if (a.input) {
-      const chunks = _chunks()
-      if (!chunks || chunks.length < 1) throw new TypeError('Input too short')
-      if (!Buffer.isBuffer(_redeem().output)) throw new TypeError('Input is invalid')
-
-      checkRedeem(_redeem())
+            const chunks = _chunks();
+            if (!chunks || chunks.length < 1)
+                throw new TypeError('Input too short');
+            if (!Buffer.isBuffer(_redeem().output))
+                throw new TypeError('Input is invalid');
+            checkRedeem(_redeem());
         }
-
         if (a.redeem) {
-      if (a.redeem.network && a.redeem.network !== network) throw new TypeError('Network mismatch')
+            if (a.redeem.network && a.redeem.network !== network)
+                throw new TypeError('Network mismatch');
             if (a.input) {
-        const redeem = _redeem()
-        if (a.redeem.output && !a.redeem.output.equals(redeem.output)) throw new TypeError('Redeem.output mismatch')
-        if (a.redeem.input && !a.redeem.input.equals(redeem.input)) throw new TypeError('Redeem.input mismatch')
+                const redeem = _redeem();
+                if (a.redeem.output && !a.redeem.output.equals(redeem.output))
+                    throw new TypeError('Redeem.output mismatch');
+                if (a.redeem.input && !a.redeem.input.equals(redeem.input))
+                    throw new TypeError('Redeem.input mismatch');
             }
-
-      checkRedeem(a.redeem)
+            checkRedeem(a.redeem);
         }
-
         if (a.witness) {
-      if (
-        a.redeem &&
+            if (a.redeem &&
                 a.redeem.witness &&
-        !stacksEqual(a.redeem.witness, a.witness)) throw new TypeError('Witness and redeem.witness mismatch')
+                !stacksEqual(a.redeem.witness, a.witness))
+                throw new TypeError('Witness and redeem.witness mismatch');
         }
     }
-
-  return Object.assign(o, a)
+    return Object.assign(o, a);
 }
-
-module.exports = p2sh
+exports.p2sh = p2sh;

src/payments/p2wpkh.js

@@ -1,28 +1,21 @@
-const lazy = require('./lazy')
-const typef = require('typeforce')
-const OPS = require('bitcoin-ops')
-const ecc = require('tiny-secp256k1')
-
-const bcrypto = require('../crypto')
-const bech32 = require('bech32')
-const bscript = require('../script')
-const BITCOIN_NETWORK = require('../networks').bitcoin
-
-const EMPTY_BUFFER = Buffer.alloc(0)
-
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const bcrypto = require("../crypto");
+const networks_1 = require("../networks");
+const bscript = require("../script");
+const lazy = require("./lazy");
+const typef = require('typeforce');
+const OPS = bscript.OPS;
+const ecc = require('tiny-secp256k1');
+const bech32 = require('bech32');
+const EMPTY_BUFFER = Buffer.alloc(0);
 // witness: {signature} {pubKey}
 // input: <>
 // output: OP_0 {pubKeyHash}
 function p2wpkh(a, opts) {
-  if (
-    !a.address &&
-    !a.hash &&
-    !a.output &&
-    !a.pubkey &&
-    !a.witness
-  ) throw new TypeError('Not enough data')
-  opts = Object.assign({ validate: true }, opts || {})
-
+    if (!a.address && !a.hash && !a.output && !a.pubkey && !a.witness)
+        throw new TypeError('Not enough data');
+    opts = Object.assign({ validate: true }, opts || {});
     typef({
         address: typef.maybe(typef.String),
         hash: typef.maybe(typef.BufferN(20)),
@@ -31,105 +24,115 @@ function p2wpkh (a, opts) {
         output: typef.maybe(typef.BufferN(22)),
         pubkey: typef.maybe(ecc.isPoint),
         signature: typef.maybe(bscript.isCanonicalScriptSignature),
-    witness: typef.maybe(typef.arrayOf(typef.Buffer))
-  }, a)
-
-  const _address = lazy.value(function () {
-    const result = bech32.decode(a.address)
-    const version = result.words.shift()
-    const data = bech32.fromWords(result.words)
+        witness: typef.maybe(typef.arrayOf(typef.Buffer)),
+    }, a);
+    const _address = lazy.value(() => {
+        const result = bech32.decode(a.address);
+        const version = result.words.shift();
+        const data = bech32.fromWords(result.words);
         return {
             version,
             prefix: result.prefix,
-      data: Buffer.from(data)
-    }
-  })
-
-  const network = a.network || BITCOIN_NETWORK
-  const o = { network }
-
-  lazy.prop(o, 'address', function () {
-    if (!o.hash) return
-
-    const words = bech32.toWords(o.hash)
-    words.unshift(0x00)
-    return bech32.encode(network.bech32, words)
-  })
-  lazy.prop(o, 'hash', function () {
-    if (a.output) return a.output.slice(2, 22)
-    if (a.address) return _address().data
-    if (a.pubkey || o.pubkey) return bcrypto.hash160(a.pubkey || o.pubkey)
-  })
-  lazy.prop(o, 'output', function () {
-    if (!o.hash) return
-    return bscript.compile([
-      OPS.OP_0,
-      o.hash
-    ])
-  })
-  lazy.prop(o, 'pubkey', function () {
-    if (a.pubkey) return a.pubkey
-    if (!a.witness) return
-    return a.witness[1]
-  })
-  lazy.prop(o, 'signature', function () {
-    if (!a.witness) return
-    return a.witness[0]
-  })
-  lazy.prop(o, 'input', function () {
-    if (!o.witness) return
-    return EMPTY_BUFFER
-  })
-  lazy.prop(o, 'witness', function () {
-    if (!a.pubkey) return
-    if (!a.signature) return
-    return [a.signature, a.pubkey]
-  })
-
+            data: Buffer.from(data),
+        };
+    });
+    const network = a.network || networks_1.bitcoin;
+    const o = { network };
+    lazy.prop(o, 'address', () => {
+        if (!o.hash)
+            return;
+        const words = bech32.toWords(o.hash);
+        words.unshift(0x00);
+        return bech32.encode(network.bech32, words);
+    });
+    lazy.prop(o, 'hash', () => {
+        if (a.output)
+            return a.output.slice(2, 22);
+        if (a.address)
+            return _address().data;
+        if (a.pubkey || o.pubkey)
+            return bcrypto.hash160(a.pubkey || o.pubkey);
+    });
+    lazy.prop(o, 'output', () => {
+        if (!o.hash)
+            return;
+        return bscript.compile([OPS.OP_0, o.hash]);
+    });
+    lazy.prop(o, 'pubkey', () => {
+        if (a.pubkey)
+            return a.pubkey;
+        if (!a.witness)
+            return;
+        return a.witness[1];
+    });
+    lazy.prop(o, 'signature', () => {
+        if (!a.witness)
+            return;
+        return a.witness[0];
+    });
+    lazy.prop(o, 'input', () => {
+        if (!o.witness)
+            return;
+        return EMPTY_BUFFER;
+    });
+    lazy.prop(o, 'witness', () => {
+        if (!a.pubkey)
+            return;
+        if (!a.signature)
+            return;
+        return [a.signature, a.pubkey];
+    });
     // extended validation
     if (opts.validate) {
-    let hash
+        let hash = Buffer.from([]);
         if (a.address) {
-      if (network && network.bech32 !== _address().prefix) throw new TypeError('Invalid prefix or Network mismatch')
-      if (_address().version !== 0x00) throw new TypeError('Invalid address version')
-      if (_address().data.length !== 20) throw new TypeError('Invalid address data')
-      hash = _address().data
+            if (network && network.bech32 !== _address().prefix)
+                throw new TypeError('Invalid prefix or Network mismatch');
+            if (_address().version !== 0x00)
+                throw new TypeError('Invalid address version');
+            if (_address().data.length !== 20)
+                throw new TypeError('Invalid address data');
+            hash = _address().data;
         }
-
         if (a.hash) {
-      if (hash && !hash.equals(a.hash)) throw new TypeError('Hash mismatch')
-      else hash = a.hash
+            if (hash.length > 0 && !hash.equals(a.hash))
+                throw new TypeError('Hash mismatch');
+            else
+                hash = a.hash;
         }
-
         if (a.output) {
-      if (
-        a.output.length !== 22 ||
+            if (a.output.length !== 22 ||
                 a.output[0] !== OPS.OP_0 ||
-        a.output[1] !== 0x14) throw new TypeError('Output is invalid')
-      if (hash && !hash.equals(a.output.slice(2))) throw new TypeError('Hash mismatch')
-      else hash = a.output.slice(2)
+                a.output[1] !== 0x14)
+                throw new TypeError('Output is invalid');
+            if (hash.length > 0 && !hash.equals(a.output.slice(2)))
+                throw new TypeError('Hash mismatch');
+            else
+                hash = a.output.slice(2);
         }
-
         if (a.pubkey) {
-      const pkh = bcrypto.hash160(a.pubkey)
-      if (hash && !hash.equals(pkh)) throw new TypeError('Hash mismatch')
-      else hash = pkh
+            const pkh = bcrypto.hash160(a.pubkey);
+            if (hash.length > 0 && !hash.equals(pkh))
+                throw new TypeError('Hash mismatch');
+            else
+                hash = pkh;
         }
-
         if (a.witness) {
-      if (a.witness.length !== 2) throw new TypeError('Witness is invalid')
-      if (!bscript.isCanonicalScriptSignature(a.witness[0])) throw new TypeError('Witness has invalid signature')
-      if (!ecc.isPoint(a.witness[1])) throw new TypeError('Witness has invalid pubkey')
-
-      if (a.signature && !a.signature.equals(a.witness[0])) throw new TypeError('Signature mismatch')
-      if (a.pubkey && !a.pubkey.equals(a.witness[1])) throw new TypeError('Pubkey mismatch')
-
-      const pkh = bcrypto.hash160(a.witness[1])
-      if (hash && !hash.equals(pkh)) throw new TypeError('Hash mismatch')
+            if (a.witness.length !== 2)
+                throw new TypeError('Witness is invalid');
+            if (!bscript.isCanonicalScriptSignature(a.witness[0]))
+                throw new TypeError('Witness has invalid signature');
+            if (!ecc.isPoint(a.witness[1]))
+                throw new TypeError('Witness has invalid pubkey');
+            if (a.signature && !a.signature.equals(a.witness[0]))
+                throw new TypeError('Signature mismatch');
+            if (a.pubkey && !a.pubkey.equals(a.witness[1]))
+                throw new TypeError('Pubkey mismatch');
+            const pkh = bcrypto.hash160(a.witness[1]);
+            if (hash.length > 0 && !hash.equals(pkh))
+                throw new TypeError('Hash mismatch');
         }
     }
-
-  return Object.assign(o, a)
+    return Object.assign(o, a);
 }
-
-module.exports = p2wpkh
+exports.p2wpkh = p2wpkh;

src/payments/p2wsh.js

@@ -1,180 +1,177 @@
-const lazy = require('./lazy')
-const typef = require('typeforce')
-const OPS = require('bitcoin-ops')
-
-const bech32 = require('bech32')
-const bcrypto = require('../crypto')
-const bscript = require('../script')
-const BITCOIN_NETWORK = require('../networks').bitcoin
-
-const EMPTY_BUFFER = Buffer.alloc(0)
-
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const bcrypto = require("../crypto");
+const networks_1 = require("../networks");
+const bscript = require("../script");
+const lazy = require("./lazy");
+const typef = require('typeforce');
+const OPS = bscript.OPS;
+const bech32 = require('bech32');
+const EMPTY_BUFFER = Buffer.alloc(0);
 function stacksEqual(a, b) {
-  if (a.length !== b.length) return false
-
-  return a.every(function (x, i) {
-    return x.equals(b[i])
-  })
+    if (a.length !== b.length)
+        return false;
+    return a.every((x, i) => {
+        return x.equals(b[i]);
+    });
 }
-
 // input: <>
 // witness: [redeemScriptSig ...] {redeemScript}
 // output: OP_0 {sha256(redeemScript)}
 function p2wsh(a, opts) {
-  if (
-    !a.address &&
-    !a.hash &&
-    !a.output &&
-    !a.redeem &&
-    !a.witness
-  ) throw new TypeError('Not enough data')
-  opts = Object.assign({ validate: true }, opts || {})
-
+    if (!a.address && !a.hash && !a.output && !a.redeem && !a.witness)
+        throw new TypeError('Not enough data');
+    opts = Object.assign({ validate: true }, opts || {});
     typef({
         network: typef.maybe(typef.Object),
-
         address: typef.maybe(typef.String),
         hash: typef.maybe(typef.BufferN(32)),
         output: typef.maybe(typef.BufferN(34)),
-
         redeem: typef.maybe({
             input: typef.maybe(typef.Buffer),
             network: typef.maybe(typef.Object),
             output: typef.maybe(typef.Buffer),
-      witness: typef.maybe(typef.arrayOf(typef.Buffer))
+            witness: typef.maybe(typef.arrayOf(typef.Buffer)),
         }),
         input: typef.maybe(typef.BufferN(0)),
-    witness: typef.maybe(typef.arrayOf(typef.Buffer))
-  }, a)
-
-  const _address = lazy.value(function () {
-    const result = bech32.decode(a.address)
-    const version = result.words.shift()
-    const data = bech32.fromWords(result.words)
+        witness: typef.maybe(typef.arrayOf(typef.Buffer)),
+    }, a);
+    const _address = lazy.value(() => {
+        const result = bech32.decode(a.address);
+        const version = result.words.shift();
+        const data = bech32.fromWords(result.words);
         return {
             version,
             prefix: result.prefix,
-      data: Buffer.from(data)
-    }
-  })
-  const _rchunks = lazy.value(function () { return bscript.decompile(a.redeem.input) })
-
-  let network = a.network
+            data: Buffer.from(data),
+        };
+    });
+    const _rchunks = lazy.value(() => {
+        return bscript.decompile(a.redeem.input);
+    });
+    let network = a.network;
     if (!network) {
-    network = (a.redeem && a.redeem.network) || BITCOIN_NETWORK
+        network = (a.redeem && a.redeem.network) || networks_1.bitcoin;
     }
-
-  const o = { network }
-
-  lazy.prop(o, 'address', function () {
-    if (!o.hash) return
-    const words = bech32.toWords(o.hash)
-    words.unshift(0x00)
-    return bech32.encode(network.bech32, words)
-  })
-  lazy.prop(o, 'hash', function () {
-    if (a.output) return a.output.slice(2)
-    if (a.address) return _address().data
-    if (o.redeem && o.redeem.output) return bcrypto.sha256(o.redeem.output)
-  })
-  lazy.prop(o, 'output', function () {
-    if (!o.hash) return
-    return bscript.compile([
-      OPS.OP_0,
-      o.hash
-    ])
-  })
-  lazy.prop(o, 'redeem', function () {
-    if (!a.witness) return
+    const o = { network };
+    lazy.prop(o, 'address', () => {
+        if (!o.hash)
+            return;
+        const words = bech32.toWords(o.hash);
+        words.unshift(0x00);
+        return bech32.encode(network.bech32, words);
+    });
+    lazy.prop(o, 'hash', () => {
+        if (a.output)
+            return a.output.slice(2);
+        if (a.address)
+            return _address().data;
+        if (o.redeem && o.redeem.output)
+            return bcrypto.sha256(o.redeem.output);
+    });
+    lazy.prop(o, 'output', () => {
+        if (!o.hash)
+            return;
+        return bscript.compile([OPS.OP_0, o.hash]);
+    });
+    lazy.prop(o, 'redeem', () => {
+        if (!a.witness)
+            return;
         return {
             output: a.witness[a.witness.length - 1],
             input: EMPTY_BUFFER,
-      witness: a.witness.slice(0, -1)
-    }
-  })
-  lazy.prop(o, 'input', function () {
-    if (!o.witness) return
-    return EMPTY_BUFFER
-  })
-  lazy.prop(o, 'witness', function () {
+            witness: a.witness.slice(0, -1),
+        };
+    });
+    lazy.prop(o, 'input', () => {
+        if (!o.witness)
+            return;
+        return EMPTY_BUFFER;
+    });
+    lazy.prop(o, 'witness', () => {
         // transform redeem input to witness stack?
-    if (
-      a.redeem &&
+        if (a.redeem &&
             a.redeem.input &&
             a.redeem.input.length > 0 &&
             a.redeem.output &&
-      a.redeem.output.length > 0
-    ) {
-      const stack = bscript.toStack(_rchunks())
-
+            a.redeem.output.length > 0) {
+            const stack = bscript.toStack(_rchunks());
             // assign, and blank the existing input
-      o.redeem = Object.assign({ witness: stack }, a.redeem)
-      o.redeem.input = EMPTY_BUFFER
-      return [].concat(stack, a.redeem.output)
+            o.redeem = Object.assign({ witness: stack }, a.redeem);
+            o.redeem.input = EMPTY_BUFFER;
+            return [].concat(stack, a.redeem.output);
         }
-
-    if (!a.redeem) return
-    if (!a.redeem.output) return
-    if (!a.redeem.witness) return
-    return [].concat(a.redeem.witness, a.redeem.output)
-  })
-
+        if (!a.redeem)
+            return;
+        if (!a.redeem.output)
+            return;
+        if (!a.redeem.witness)
+            return;
+        return [].concat(a.redeem.witness, a.redeem.output);
+    });
     // extended validation
     if (opts.validate) {
-    let hash
+        let hash = Buffer.from([]);
         if (a.address) {
-      if (_address().prefix !== network.bech32) throw new TypeError('Invalid prefix or Network mismatch')
-      if (_address().version !== 0x00) throw new TypeError('Invalid address version')
-      if (_address().data.length !== 32) throw new TypeError('Invalid address data')
-      hash = _address().data
+            if (_address().prefix !== network.bech32)
+                throw new TypeError('Invalid prefix or Network mismatch');
+            if (_address().version !== 0x00)
+                throw new TypeError('Invalid address version');
+            if (_address().data.length !== 32)
+                throw new TypeError('Invalid address data');
+            hash = _address().data;
         }
-
         if (a.hash) {
-      if (hash && !hash.equals(a.hash)) throw new TypeError('Hash mismatch')
-      else hash = a.hash
+            if (hash.length > 0 && !hash.equals(a.hash))
+                throw new TypeError('Hash mismatch');
+            else
+                hash = a.hash;
         }
-
         if (a.output) {
-      if (
-        a.output.length !== 34 ||
+            if (a.output.length !== 34 ||
                 a.output[0] !== OPS.OP_0 ||
-        a.output[1] !== 0x20) throw new TypeError('Output is invalid')
-      const hash2 = a.output.slice(2)
-      if (hash && !hash.equals(hash2)) throw new TypeError('Hash mismatch')
-      else hash = hash2
+                a.output[1] !== 0x20)
+                throw new TypeError('Output is invalid');
+            const hash2 = a.output.slice(2);
+            if (hash.length > 0 && !hash.equals(hash2))
+                throw new TypeError('Hash mismatch');
+            else
+                hash = hash2;
         }
-
         if (a.redeem) {
-      if (a.redeem.network && a.redeem.network !== network) throw new TypeError('Network mismatch')
-
+            if (a.redeem.network && a.redeem.network !== network)
+                throw new TypeError('Network mismatch');
             // is there two redeem sources?
-      if (
-        a.redeem.input &&
+            if (a.redeem.input &&
                 a.redeem.input.length > 0 &&
                 a.redeem.witness &&
-        a.redeem.witness.length > 0
-      ) throw new TypeError('Ambiguous witness source')
-
+                a.redeem.witness.length > 0)
+                throw new TypeError('Ambiguous witness source');
             // is the redeem output non-empty?
             if (a.redeem.output) {
-        if (bscript.decompile(a.redeem.output).length === 0) throw new TypeError('Redeem.output is invalid')
-
+                if (bscript.decompile(a.redeem.output).length === 0)
+                    throw new TypeError('Redeem.output is invalid');
                 // match hash against other sources
-        const hash2 = bcrypto.sha256(a.redeem.output)
-        if (hash && !hash.equals(hash2)) throw new TypeError('Hash mismatch')
-        else hash = hash2
+                const hash2 = bcrypto.sha256(a.redeem.output);
+                if (hash.length > 0 && !hash.equals(hash2))
+                    throw new TypeError('Hash mismatch');
+                else
+                    hash = hash2;
             }
-
-      if (a.redeem.input && !bscript.isPushOnly(_rchunks())) throw new TypeError('Non push-only scriptSig')
-      if (a.witness && a.redeem.witness && !stacksEqual(a.witness, a.redeem.witness)) throw new TypeError('Witness and redeem.witness mismatch')
+            if (a.redeem.input && !bscript.isPushOnly(_rchunks()))
+                throw new TypeError('Non push-only scriptSig');
+            if (a.witness &&
+                a.redeem.witness &&
+                !stacksEqual(a.witness, a.redeem.witness))
+                throw new TypeError('Witness and redeem.witness mismatch');
         }
-
         if (a.witness) {
-      if (a.redeem && a.redeem.output && !a.redeem.output.equals(a.witness[a.witness.length - 1])) throw new TypeError('Witness and redeem.output mismatch')
+            if (a.redeem &&
+                a.redeem.output &&
+                !a.redeem.output.equals(a.witness[a.witness.length - 1]))
+                throw new TypeError('Witness and redeem.output mismatch');
         }
     }
-
-  return Object.assign(o, a)
+    return Object.assign(o, a);
 }
-
-module.exports = p2wsh
+exports.p2wsh = p2wsh;

src/script.js

@@ -1,205 +1,191 @@
-const Buffer = require('safe-buffer').Buffer
-const bip66 = require('bip66')
-const ecc = require('tiny-secp256k1')
-const pushdata = require('pushdata-bitcoin')
-const typeforce = require('typeforce')
-const types = require('./types')
-const scriptNumber = require('./script_number')
-
-const OPS = require('bitcoin-ops')
-const REVERSE_OPS = require('bitcoin-ops/map')
-const OP_INT_BASE = OPS.OP_RESERVED // OP_1 - 1
-
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const scriptNumber = require("./script_number");
+const scriptSignature = require("./script_signature");
+const types = require("./types");
+const bip66 = require('bip66');
+const ecc = require('tiny-secp256k1');
+const pushdata = require('pushdata-bitcoin');
+const typeforce = require('typeforce');
+exports.OPS = require('bitcoin-ops');
+const REVERSE_OPS = require('bitcoin-ops/map');
+const OP_INT_BASE = exports.OPS.OP_RESERVED; // OP_1 - 1
 function isOPInt(value) {
-  return types.Number(value) &&
-    ((value === OPS.OP_0) ||
-    (value >= OPS.OP_1 && value <= OPS.OP_16) ||
-    (value === OPS.OP_1NEGATE))
+    return (types.Number(value) &&
+        (value === exports.OPS.OP_0 ||
+            (value >= exports.OPS.OP_1 && value <= exports.OPS.OP_16) ||
+            value === exports.OPS.OP_1NEGATE));
 }
-
 function isPushOnlyChunk(value) {
-  return types.Buffer(value) || isOPInt(value)
+    return types.Buffer(value) || isOPInt(value);
 }
-
 function isPushOnly(value) {
-  return types.Array(value) && value.every(isPushOnlyChunk)
+    return types.Array(value) && value.every(isPushOnlyChunk);
 }
-
+exports.isPushOnly = isPushOnly;
 function asMinimalOP(buffer) {
-  if (buffer.length === 0) return OPS.OP_0
-  if (buffer.length !== 1) return
-  if (buffer[0] >= 1 && buffer[0] <= 16) return OP_INT_BASE + buffer[0]
-  if (buffer[0] === 0x81) return OPS.OP_1NEGATE
+    if (buffer.length === 0)
+        return exports.OPS.OP_0;
+    if (buffer.length !== 1)
+        return;
+    if (buffer[0] >= 1 && buffer[0] <= 16)
+        return OP_INT_BASE + buffer[0];
+    if (buffer[0] === 0x81)
+        return exports.OPS.OP_1NEGATE;
+}
+function chunksIsBuffer(buf) {
+    return Buffer.isBuffer(buf);
+}
+function chunksIsArray(buf) {
+    return types.Array(buf);
+}
+function singleChunkIsBuffer(buf) {
+    return Buffer.isBuffer(buf);
 }
-
 function compile(chunks) {
     // TODO: remove me
-  if (Buffer.isBuffer(chunks)) return chunks
-
-  typeforce(types.Array, chunks)
-
-  const bufferSize = chunks.reduce(function (accum, chunk) {
+    if (chunksIsBuffer(chunks))
+        return chunks;
+    typeforce(types.Array, chunks);
+    const bufferSize = chunks.reduce((accum, chunk) => {
         // data chunk
-    if (Buffer.isBuffer(chunk)) {
+        if (singleChunkIsBuffer(chunk)) {
             // adhere to BIP62.3, minimal push policy
             if (chunk.length === 1 && asMinimalOP(chunk) !== undefined) {
-        return accum + 1
+                return accum + 1;
             }
-
-      return accum + pushdata.encodingLength(chunk.length) + chunk.length
+            return accum + pushdata.encodingLength(chunk.length) + chunk.length;
         }
-
         // opcode
-    return accum + 1
-  }, 0.0)
-
-  const buffer = Buffer.allocUnsafe(bufferSize)
-  let offset = 0
-
-  chunks.forEach(function (chunk) {
+        return accum + 1;
+    }, 0.0);
+    const buffer = Buffer.allocUnsafe(bufferSize);
+    let offset = 0;
+    chunks.forEach(chunk => {
         // data chunk
-    if (Buffer.isBuffer(chunk)) {
+        if (singleChunkIsBuffer(chunk)) {
             // adhere to BIP62.3, minimal push policy
-      const opcode = asMinimalOP(chunk)
+            const opcode = asMinimalOP(chunk);
             if (opcode !== undefined) {
-        buffer.writeUInt8(opcode, offset)
-        offset += 1
-        return
+                buffer.writeUInt8(opcode, offset);
+                offset += 1;
+                return;
             }
-
-      offset += pushdata.encode(buffer, chunk.length, offset)
-      chunk.copy(buffer, offset)
-      offset += chunk.length
-
+            offset += pushdata.encode(buffer, chunk.length, offset);
+            chunk.copy(buffer, offset);
+            offset += chunk.length;
             // opcode
-    } else {
-      buffer.writeUInt8(chunk, offset)
-      offset += 1
         }
-  })
-
-  if (offset !== buffer.length) throw new Error('Could not decode chunks')
-  return buffer
+        else {
+            buffer.writeUInt8(chunk, offset);
+            offset += 1;
         }
-
+    });
+    if (offset !== buffer.length)
+        throw new Error('Could not decode chunks');
+    return buffer;
+}
+exports.compile = compile;
 function decompile(buffer) {
     // TODO: remove me
-  if (types.Array(buffer)) return buffer
-
-  typeforce(types.Buffer, buffer)
-
-  const chunks = []
-  let i = 0
-
+    if (chunksIsArray(buffer))
+        return buffer;
+    typeforce(types.Buffer, buffer);
+    const chunks = [];
+    let i = 0;
     while (i < buffer.length) {
-    const opcode = buffer[i]
-
+        const opcode = buffer[i];
         // data chunk
-    if ((opcode > OPS.OP_0) && (opcode <= OPS.OP_PUSHDATA4)) {
-      const d = pushdata.decode(buffer, i)
-
+        if (opcode > exports.OPS.OP_0 && opcode <= exports.OPS.OP_PUSHDATA4) {
+            const d = pushdata.decode(buffer, i);
             // did reading a pushDataInt fail?
-      if (d === null) return null
-      i += d.size
-
+            if (d === null)
+                return null;
+            i += d.size;
             // attempt to read too much data?
-      if (i + d.number > buffer.length) return null
-
-      const data = buffer.slice(i, i + d.number)
-      i += d.number
-
+            if (i + d.number > buffer.length)
+                return null;
+            const data = buffer.slice(i, i + d.number);
+            i += d.number;
             // decompile minimally
-      const op = asMinimalOP(data)
+            const op = asMinimalOP(data);
             if (op !== undefined) {
-        chunks.push(op)
-      } else {
-        chunks.push(data)
+                chunks.push(op);
+            }
+            else {
+                chunks.push(data);
             }
-
             // opcode
-    } else {
-      chunks.push(opcode)
-
-      i += 1
+        }
+        else {
+            chunks.push(opcode);
+            i += 1;
         }
     }
-
-  return chunks
+    return chunks;
 }
-
+exports.decompile = decompile;
 function toASM(chunks) {
-  if (Buffer.isBuffer(chunks)) {
-    chunks = decompile(chunks)
+    if (chunksIsBuffer(chunks)) {
+        chunks = decompile(chunks);
     }
-
-  return chunks.map(function (chunk) {
+    return chunks
+        .map(chunk => {
         // data?
-    if (Buffer.isBuffer(chunk)) {
-      const op = asMinimalOP(chunk)
-      if (op === undefined) return chunk.toString('hex')
-      chunk = op
+        if (singleChunkIsBuffer(chunk)) {
+            const op = asMinimalOP(chunk);
+            if (op === undefined)
+                return chunk.toString('hex');
+            chunk = op;
         }
-
         // opcode!
-    return REVERSE_OPS[chunk]
-  }).join(' ')
-}
-
-function fromASM (asm) {
-  typeforce(types.String, asm)
-
-  return compile(asm.split(' ').map(function (chunkStr) {
-    // opcode?
-    if (OPS[chunkStr] !== undefined) return OPS[chunkStr]
-    typeforce(types.Hex, chunkStr)
-
-    // data!
-    return Buffer.from(chunkStr, 'hex')
-  }))
-}
-
-function toStack (chunks) {
-  chunks = decompile(chunks)
-  typeforce(isPushOnly, chunks)
-
-  return chunks.map(function (op) {
-    if (Buffer.isBuffer(op)) return op
-    if (op === OPS.OP_0) return Buffer.allocUnsafe(0)
-
-    return scriptNumber.encode(op - OP_INT_BASE)
+        return REVERSE_OPS[chunk];
     })
+        .join(' ');
 }
-
+exports.toASM = toASM;
+function fromASM(asm) {
+    typeforce(types.String, asm);
+    return compile(asm.split(' ').map(chunkStr => {
+        // opcode?
+        if (exports.OPS[chunkStr] !== undefined)
+            return exports.OPS[chunkStr];
+        typeforce(types.Hex, chunkStr);
+        // data!
+        return Buffer.from(chunkStr, 'hex');
+    }));
+}
+exports.fromASM = fromASM;
+function toStack(chunks) {
+    chunks = decompile(chunks);
+    typeforce(isPushOnly, chunks);
+    return chunks.map(op => {
+        if (singleChunkIsBuffer(op))
+            return op;
+        if (op === exports.OPS.OP_0)
+            return Buffer.allocUnsafe(0);
+        return scriptNumber.encode(op - OP_INT_BASE);
+    });
+}
+exports.toStack = toStack;
 function isCanonicalPubKey(buffer) {
-  return ecc.isPoint(buffer)
+    return ecc.isPoint(buffer);
 }
-
+exports.isCanonicalPubKey = isCanonicalPubKey;
 function isDefinedHashType(hashType) {
-  const hashTypeMod = hashType & ~0x80
-
+    const hashTypeMod = hashType & ~0x80;
     // return hashTypeMod > SIGHASH_ALL && hashTypeMod < SIGHASH_SINGLE
-  return hashTypeMod > 0x00 && hashTypeMod < 0x04
+    return hashTypeMod > 0x00 && hashTypeMod < 0x04;
 }
-
+exports.isDefinedHashType = isDefinedHashType;
 function isCanonicalScriptSignature(buffer) {
-  if (!Buffer.isBuffer(buffer)) return false
-  if (!isDefinedHashType(buffer[buffer.length - 1])) return false
-
-  return bip66.check(buffer.slice(0, -1))
-}
-
-module.exports = {
-  compile: compile,
-  decompile: decompile,
-  fromASM: fromASM,
-  toASM: toASM,
-  toStack: toStack,
-
-  number: require('./script_number'),
-  signature: require('./script_signature'),
-
-  isCanonicalPubKey: isCanonicalPubKey,
-  isCanonicalScriptSignature: isCanonicalScriptSignature,
-  isPushOnly: isPushOnly,
-  isDefinedHashType: isDefinedHashType
+    if (!Buffer.isBuffer(buffer))
+        return false;
+    if (!isDefinedHashType(buffer[buffer.length - 1]))
+        return false;
+    return bip66.check(buffer.slice(0, -1));
 }
+exports.isCanonicalScriptSignature = isCanonicalScriptSignature;
+// tslint:disable-next-line variable-name
+exports.number = scriptNumber;
+exports.signature = scriptSignature;

src/script_number.js

@@ -1,67 +1,65 @@
-const Buffer = require('safe-buffer').Buffer
-
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
 function decode(buffer, maxLength, minimal) {
-  maxLength = maxLength || 4
-  minimal = minimal === undefined ? true : minimal
-
-  const length = buffer.length
-  if (length === 0) return 0
-  if (length > maxLength) throw new TypeError('Script number overflow')
+    maxLength = maxLength || 4;
+    minimal = minimal === undefined ? true : minimal;
+    const length = buffer.length;
+    if (length === 0)
+        return 0;
+    if (length > maxLength)
+        throw new TypeError('Script number overflow');
     if (minimal) {
         if ((buffer[length - 1] & 0x7f) === 0) {
-      if (length <= 1 || (buffer[length - 2] & 0x80) === 0) throw new Error('Non-minimally encoded script number')
+            if (length <= 1 || (buffer[length - 2] & 0x80) === 0)
+                throw new Error('Non-minimally encoded script number');
         }
     }
-
     // 40-bit
     if (length === 5) {
-    const a = buffer.readUInt32LE(0)
-    const b = buffer.readUInt8(4)
-
-    if (b & 0x80) return -(((b & ~0x80) * 0x100000000) + a)
-    return (b * 0x100000000) + a
+        const a = buffer.readUInt32LE(0);
+        const b = buffer.readUInt8(4);
+        if (b & 0x80)
+            return -((b & ~0x80) * 0x100000000 + a);
+        return b * 0x100000000 + a;
     }
-
     // 32-bit / 24-bit / 16-bit / 8-bit
-  let result = 0
-  for (var i = 0; i < length; ++i) {
-    result |= buffer[i] << (8 * i)
+    let result = 0;
+    for (let i = 0; i < length; ++i) {
+        result |= buffer[i] << (8 * i);
     }
-
-  if (buffer[length - 1] & 0x80) return -(result & ~(0x80 << (8 * (length - 1))))
-  return result
+    if (buffer[length - 1] & 0x80)
+        return -(result & ~(0x80 << (8 * (length - 1))));
+    return result;
 }
-
+exports.decode = decode;
 function scriptNumSize(i) {
-  return i > 0x7fffffff ? 5
-    : i > 0x7fffff ? 4
-      : i > 0x7fff ? 3
-        : i > 0x7f ? 2
-          : i > 0x00 ? 1
-            : 0
+    return i > 0x7fffffff
+        ? 5
+        : i > 0x7fffff
+            ? 4
+            : i > 0x7fff
+                ? 3
+                : i > 0x7f
+                    ? 2
+                    : i > 0x00
+                        ? 1
+                        : 0;
 }
-
-function encode (number) {
-  let value = Math.abs(number)
-  const size = scriptNumSize(value)
-  const buffer = Buffer.allocUnsafe(size)
-  const negative = number < 0
-
-  for (var i = 0; i < size; ++i) {
-    buffer.writeUInt8(value & 0xff, i)
-    value >>= 8
+function encode(_number) {
+    let value = Math.abs(_number);
+    const size = scriptNumSize(value);
+    const buffer = Buffer.allocUnsafe(size);
+    const negative = _number < 0;
+    for (let i = 0; i < size; ++i) {
+        buffer.writeUInt8(value & 0xff, i);
+        value >>= 8;
     }
-
     if (buffer[size - 1] & 0x80) {
-    buffer.writeUInt8(negative ? 0x80 : 0x00, size - 1)
-  } else if (negative) {
-    buffer[size - 1] |= 0x80
+        buffer.writeUInt8(negative ? 0x80 : 0x00, size - 1);
     }
-
-  return buffer
+    else if (negative) {
+        buffer[size - 1] |= 0x80;
     }
-
-module.exports = {
-  decode: decode,
-  encode: encode
+    return buffer;
 }
+exports.encode = encode;

src/script_signature.js

@@ -1,64 +1,53 @@
-const bip66 = require('bip66')
-const Buffer = require('safe-buffer').Buffer
-const typeforce = require('typeforce')
-const types = require('./types')
-
-const ZERO = Buffer.alloc(1, 0)
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const types = require("./types");
+const bip66 = require('bip66');
+const typeforce = require('typeforce');
+const ZERO = Buffer.alloc(1, 0);
 function toDER(x) {
-  let i = 0
-  while (x[i] === 0) ++i
-  if (i === x.length) return ZERO
-  x = x.slice(i)
-  if (x[0] & 0x80) return Buffer.concat([ZERO, x], 1 + x.length)
-  return x
+    let i = 0;
+    while (x[i] === 0)
+        ++i;
+    if (i === x.length)
+        return ZERO;
+    x = x.slice(i);
+    if (x[0] & 0x80)
+        return Buffer.concat([ZERO, x], 1 + x.length);
+    return x;
 }
-
 function fromDER(x) {
-  if (x[0] === 0x00) x = x.slice(1)
-  const buffer = Buffer.alloc(32, 0)
-  const bstart = Math.max(0, 32 - x.length)
-  x.copy(buffer, bstart)
-  return buffer
+    if (x[0] === 0x00)
+        x = x.slice(1);
+    const buffer = Buffer.alloc(32, 0);
+    const bstart = Math.max(0, 32 - x.length);
+    x.copy(buffer, bstart);
+    return buffer;
 }
-
 // BIP62: 1 byte hashType flag (only 0x01, 0x02, 0x03, 0x81, 0x82 and 0x83 are allowed)
 function decode(buffer) {
-  const hashType = buffer.readUInt8(buffer.length - 1)
-  const hashTypeMod = hashType & ~0x80
-  if (hashTypeMod <= 0 || hashTypeMod >= 4) throw new Error('Invalid hashType ' + hashType)
-
-  const decode = bip66.decode(buffer.slice(0, -1))
-  const r = fromDER(decode.r)
-  const s = fromDER(decode.s)
-
-  return {
-    signature: Buffer.concat([r, s], 64),
-    hashType: hashType
+    const hashType = buffer.readUInt8(buffer.length - 1);
+    const hashTypeMod = hashType & ~0x80;
+    if (hashTypeMod <= 0 || hashTypeMod >= 4)
+        throw new Error('Invalid hashType ' + hashType);
+    const decoded = bip66.decode(buffer.slice(0, -1));
+    const r = fromDER(decoded.r);
+    const s = fromDER(decoded.s);
+    const signature = Buffer.concat([r, s], 64);
+    return { signature, hashType };
 }
-}
-
+exports.decode = decode;
 function encode(signature, hashType) {
     typeforce({
         signature: types.BufferN(64),
-    hashType: types.UInt8
-  }, { signature, hashType })
-
-  const hashTypeMod = hashType & ~0x80
-  if (hashTypeMod <= 0 || hashTypeMod >= 4) throw new Error('Invalid hashType ' + hashType)
-
-  const hashTypeBuffer = Buffer.allocUnsafe(1)
-  hashTypeBuffer.writeUInt8(hashType, 0)
-
-  const r = toDER(signature.slice(0, 32))
-  const s = toDER(signature.slice(32, 64))
-
-  return Buffer.concat([
-    bip66.encode(r, s),
-    hashTypeBuffer
-  ])
-}
-
-module.exports = {
-  decode: decode,
-  encode: encode
+        hashType: types.UInt8,
+    }, { signature, hashType });
+    const hashTypeMod = hashType & ~0x80;
+    if (hashTypeMod <= 0 || hashTypeMod >= 4)
+        throw new Error('Invalid hashType ' + hashType);
+    const hashTypeBuffer = Buffer.allocUnsafe(1);
+    hashTypeBuffer.writeUInt8(hashType, 0);
+    const r = toDER(signature.slice(0, 32));
+    const s = toDER(signature.slice(32, 64));
+    return Buffer.concat([bip66.encode(r, s), hashTypeBuffer]);
 }
+exports.encode = encode;

src/templates/multisig/index.js

@@ -1,4 +1,6 @@
-module.exports = {
-  input: require('./input'),
-  output: require('./output')
-}
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const input = require("./input");
+exports.input = input;
+const output = require("./output");
+exports.output = output;

src/templates/multisig/input.js

@@ -1,23 +1,23 @@
+"use strict";
 // OP_0 [signatures ...]
-
-const bscript = require('../../script')
-const OPS = require('bitcoin-ops')
-
+Object.defineProperty(exports, "__esModule", { value: true });
+const bscript = require("../../script");
+const script_1 = require("../../script");
 function partialSignature(value) {
-  return value === OPS.OP_0 || bscript.isCanonicalScriptSignature(value)
+    return (value === script_1.OPS.OP_0 || bscript.isCanonicalScriptSignature(value));
 }
-
 function check(script, allowIncomplete) {
-  const chunks = bscript.decompile(script)
-  if (chunks.length < 2) return false
-  if (chunks[0] !== OPS.OP_0) return false
-
+    const chunks = bscript.decompile(script);
+    if (chunks.length < 2)
+        return false;
+    if (chunks[0] !== script_1.OPS.OP_0)
+        return false;
     if (allowIncomplete) {
-    return chunks.slice(1).every(partialSignature)
+        return chunks.slice(1).every(partialSignature);
     }
-
-  return chunks.slice(1).every(bscript.isCanonicalScriptSignature)
+    return chunks.slice(1).every(bscript.isCanonicalScriptSignature);
 }
-check.toJSON = function () { return 'multisig input' }
-
-module.exports = { check }
+exports.check = check;
+check.toJSON = () => {
+    return 'multisig input';
+};

src/templates/multisig/output.js

@@ -1,29 +1,36 @@
+"use strict";
 // m [pubKeys ...] n OP_CHECKMULTISIG
-
-const bscript = require('../../script')
-const types = require('../../types')
-const OPS = require('bitcoin-ops')
-const OP_INT_BASE = OPS.OP_RESERVED // OP_1 - 1
-
+Object.defineProperty(exports, "__esModule", { value: true });
+const bscript = require("../../script");
+const script_1 = require("../../script");
+const types = require("../../types");
+const OP_INT_BASE = script_1.OPS.OP_RESERVED; // OP_1 - 1
 function check(script, allowIncomplete) {
-  const chunks = bscript.decompile(script)
-
-  if (chunks.length < 4) return false
-  if (chunks[chunks.length - 1] !== OPS.OP_CHECKMULTISIG) return false
-  if (!types.Number(chunks[0])) return false
-  if (!types.Number(chunks[chunks.length - 2])) return false
-  const m = chunks[0] - OP_INT_BASE
-  const n = chunks[chunks.length - 2] - OP_INT_BASE
-
-  if (m <= 0) return false
-  if (n > 16) return false
-  if (m > n) return false
-  if (n !== chunks.length - 3) return false
-  if (allowIncomplete) return true
-
-  const keys = chunks.slice(1, -2)
-  return keys.every(bscript.isCanonicalPubKey)
+    const chunks = bscript.decompile(script);
+    if (chunks.length < 4)
+        return false;
+    if (chunks[chunks.length - 1] !== script_1.OPS.OP_CHECKMULTISIG)
+        return false;
+    if (!types.Number(chunks[0]))
+        return false;
+    if (!types.Number(chunks[chunks.length - 2]))
+        return false;
+    const m = chunks[0] - OP_INT_BASE;
+    const n = chunks[chunks.length - 2] - OP_INT_BASE;
+    if (m <= 0)
+        return false;
+    if (n > 16)
+        return false;
+    if (m > n)
+        return false;
+    if (n !== chunks.length - 3)
+        return false;
+    if (allowIncomplete)
+        return true;
+    const keys = chunks.slice(1, -2);
+    return keys.every(bscript.isCanonicalPubKey);
 }
-check.toJSON = function () { return 'multi-sig output' }
-
-module.exports = { check }
+exports.check = check;
+check.toJSON = () => {
+    return 'multi-sig output';
+};

src/templates/nulldata.js

@@ -1,14 +1,15 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
 // OP_RETURN {data}
-
-const bscript = require('../script')
-const OPS = require('bitcoin-ops')
-
+const bscript = require("../script");
+const OPS = bscript.OPS;
 function check(script) {
-  const buffer = bscript.compile(script)
-
-  return buffer.length > 1 &&
-    buffer[0] === OPS.OP_RETURN
+    const buffer = bscript.compile(script);
+    return buffer.length > 1 && buffer[0] === OPS.OP_RETURN;
 }
-check.toJSON = function () { return 'null data output' }
-
-module.exports = { output: { check: check } }
+exports.check = check;
+check.toJSON = () => {
+    return 'null data output';
+};
+const output = { check };
+exports.output = output;

src/templates/pubkey/index.js

@@ -1,4 +1,6 @@
-module.exports = {
-  input: require('./input'),
-  output: require('./output')
-}
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const input = require("./input");
+exports.input = input;
+const output = require("./output");
+exports.output = output;

src/templates/pubkey/input.js

@@ -1,15 +1,13 @@
+"use strict";
 // {signature}
-
-const bscript = require('../../script')
-
+Object.defineProperty(exports, "__esModule", { value: true });
+const bscript = require("../../script");
 function check(script) {
-  const chunks = bscript.decompile(script)
-
-  return chunks.length === 1 &&
-    bscript.isCanonicalScriptSignature(chunks[0])
-}
-check.toJSON = function () { return 'pubKey input' }
-
-module.exports = {
-  check: check
+    const chunks = bscript.decompile(script);
+    return (chunks.length === 1 &&
+        bscript.isCanonicalScriptSignature(chunks[0]));
 }
+exports.check = check;
+check.toJSON = () => {
+    return 'pubKey input';
+};

src/templates/pubkey/output.js

@@ -1,15 +1,15 @@
+"use strict";
 // {pubKey} OP_CHECKSIG
-
-const bscript = require('../../script')
-const OPS = require('bitcoin-ops')
-
+Object.defineProperty(exports, "__esModule", { value: true });
+const bscript = require("../../script");
+const script_1 = require("../../script");
 function check(script) {
-  const chunks = bscript.decompile(script)
-
-  return chunks.length === 2 &&
+    const chunks = bscript.decompile(script);
+    return (chunks.length === 2 &&
         bscript.isCanonicalPubKey(chunks[0]) &&
-    chunks[1] === OPS.OP_CHECKSIG
+        chunks[1] === script_1.OPS.OP_CHECKSIG);
 }
-check.toJSON = function () { return 'pubKey output' }
-
-module.exports = { check }
+exports.check = check;
+check.toJSON = () => {
+    return 'pubKey output';
+};

src/templates/pubkeyhash/index.js

@@ -1,4 +1,6 @@
-module.exports = {
-  input: require('./input'),
-  output: require('./output')
-}
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const input = require("./input");
+exports.input = input;
+const output = require("./output");
+exports.output = output;

src/templates/pubkeyhash/input.js

@@ -1,14 +1,14 @@
+"use strict";
 // {signature} {pubKey}
-
-const bscript = require('../../script')
-
+Object.defineProperty(exports, "__esModule", { value: true });
+const bscript = require("../../script");
 function check(script) {
-  const chunks = bscript.decompile(script)
-
-  return chunks.length === 2 &&
+    const chunks = bscript.decompile(script);
+    return (chunks.length === 2 &&
         bscript.isCanonicalScriptSignature(chunks[0]) &&
-    bscript.isCanonicalPubKey(chunks[1])
+        bscript.isCanonicalPubKey(chunks[1]));
 }
-check.toJSON = function () { return 'pubKeyHash input' }
-
-module.exports = { check }
+exports.check = check;
+check.toJSON = () => {
+    return 'pubKeyHash input';
+};

src/templates/pubkeyhash/output.js

@@ -1,18 +1,18 @@
+"use strict";
 // OP_DUP OP_HASH160 {pubKeyHash} OP_EQUALVERIFY OP_CHECKSIG
-
-const bscript = require('../../script')
-const OPS = require('bitcoin-ops')
-
+Object.defineProperty(exports, "__esModule", { value: true });
+const bscript = require("../../script");
+const script_1 = require("../../script");
 function check(script) {
-  const buffer = bscript.compile(script)
-
-  return buffer.length === 25 &&
-    buffer[0] === OPS.OP_DUP &&
-    buffer[1] === OPS.OP_HASH160 &&
+    const buffer = bscript.compile(script);
+    return (buffer.length === 25 &&
+        buffer[0] === script_1.OPS.OP_DUP &&
+        buffer[1] === script_1.OPS.OP_HASH160 &&
         buffer[2] === 0x14 &&
-    buffer[23] === OPS.OP_EQUALVERIFY &&
-    buffer[24] === OPS.OP_CHECKSIG
+        buffer[23] === script_1.OPS.OP_EQUALVERIFY &&
+        buffer[24] === script_1.OPS.OP_CHECKSIG);
 }
-check.toJSON = function () { return 'pubKeyHash output' }
-
-module.exports = { check }
+exports.check = check;
+check.toJSON = () => {
+    return 'pubKeyHash output';
+};

src/templates/scripthash/index.js

@@ -1,4 +1,6 @@
-module.exports = {
-  input: require('./input'),
-  output: require('./output')
-}
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const input = require("./input");
+exports.input = input;
+const output = require("./output");
+exports.output = output;

src/templates/scripthash/input.js

@@ -1,48 +1,44 @@
+"use strict";
 // <scriptSig> {serialized scriptPubKey script}
-
-const Buffer = require('safe-buffer').Buffer
-const bscript = require('../../script')
-
-const p2ms = require('../multisig/')
-const p2pk = require('../pubkey/')
-const p2pkh = require('../pubkeyhash/')
-const p2wpkho = require('../witnesspubkeyhash/output')
-const p2wsho = require('../witnessscripthash/output')
-
+Object.defineProperty(exports, "__esModule", { value: true });
+const bscript = require("../../script");
+const p2ms = require("../multisig");
+const p2pk = require("../pubkey");
+const p2pkh = require("../pubkeyhash");
+const p2wpkho = require("../witnesspubkeyhash/output");
+const p2wsho = require("../witnessscripthash/output");
 function check(script, allowIncomplete) {
-  const chunks = bscript.decompile(script)
-  if (chunks.length < 1) return false
-
-  const lastChunk = chunks[chunks.length - 1]
-  if (!Buffer.isBuffer(lastChunk)) return false
-
-  const scriptSigChunks = bscript.decompile(bscript.compile(chunks.slice(0, -1)))
-  const redeemScriptChunks = bscript.decompile(lastChunk)
-
+    const chunks = bscript.decompile(script);
+    if (chunks.length < 1)
+        return false;
+    const lastChunk = chunks[chunks.length - 1];
+    if (!Buffer.isBuffer(lastChunk))
+        return false;
+    const scriptSigChunks = bscript.decompile(bscript.compile(chunks.slice(0, -1)));
+    const redeemScriptChunks = bscript.decompile(lastChunk);
     // is redeemScript a valid script?
-  if (!redeemScriptChunks) return false
-
+    if (!redeemScriptChunks)
+        return false;
     // is redeemScriptSig push only?
-  if (!bscript.isPushOnly(scriptSigChunks)) return false
-
+    if (!bscript.isPushOnly(scriptSigChunks))
+        return false;
     // is witness?
     if (chunks.length === 1) {
-    return p2wsho.check(redeemScriptChunks) ||
-      p2wpkho.check(redeemScriptChunks)
+        return (p2wsho.check(redeemScriptChunks) || p2wpkho.check(redeemScriptChunks));
     }
-
     // match types
     if (p2pkh.input.check(scriptSigChunks) &&
-    p2pkh.output.check(redeemScriptChunks)) return true
-
+        p2pkh.output.check(redeemScriptChunks))
+        return true;
     if (p2ms.input.check(scriptSigChunks, allowIncomplete) &&
-    p2ms.output.check(redeemScriptChunks)) return true
-
+        p2ms.output.check(redeemScriptChunks))
+        return true;
     if (p2pk.input.check(scriptSigChunks) &&
-    p2pk.output.check(redeemScriptChunks)) return true
-
-  return false
+        p2pk.output.check(redeemScriptChunks))
+        return true;
+    return false;
 }
-check.toJSON = function () { return 'scriptHash input' }
-
-module.exports = { check }
+exports.check = check;
+check.toJSON = () => {
+    return 'scriptHash input';
+};

src/templates/scripthash/output.js

@@ -1,16 +1,16 @@
+"use strict";
 // OP_HASH160 {scriptHash} OP_EQUAL
-
-const bscript = require('../../script')
-const OPS = require('bitcoin-ops')
-
+Object.defineProperty(exports, "__esModule", { value: true });
+const bscript = require("../../script");
+const script_1 = require("../../script");
 function check(script) {
-  const buffer = bscript.compile(script)
-
-  return buffer.length === 23 &&
-    buffer[0] === OPS.OP_HASH160 &&
+    const buffer = bscript.compile(script);
+    return (buffer.length === 23 &&
+        buffer[0] === script_1.OPS.OP_HASH160 &&
         buffer[1] === 0x14 &&
-    buffer[22] === OPS.OP_EQUAL
+        buffer[22] === script_1.OPS.OP_EQUAL);
 }
-check.toJSON = function () { return 'scriptHash output' }
-
-module.exports = { check }
+exports.check = check;
+check.toJSON = () => {
+    return 'scriptHash output';
+};

src/templates/witnesscommitment/index.js

@@ -1,3 +1,4 @@
-module.exports = {
-  output: require('./output')
-}
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const output = require("./output");
+exports.output = output;

src/templates/witnesscommitment/output.js

@@ -1,42 +1,32 @@
+"use strict";
 // OP_RETURN {aa21a9ed} {commitment}
-
-const Buffer = require('safe-buffer').Buffer
-const bscript = require('../../script')
-const types = require('../../types')
-const typeforce = require('typeforce')
-const OPS = require('bitcoin-ops')
-
-const HEADER = Buffer.from('aa21a9ed', 'hex')
-
+Object.defineProperty(exports, "__esModule", { value: true });
+const bscript = require("../../script");
+const script_1 = require("../../script");
+const types = require("../../types");
+const typeforce = require('typeforce');
+const HEADER = Buffer.from('aa21a9ed', 'hex');
 function check(script) {
-  const buffer = bscript.compile(script)
-
-  return buffer.length > 37 &&
-    buffer[0] === OPS.OP_RETURN &&
+    const buffer = bscript.compile(script);
+    return (buffer.length > 37 &&
+        buffer[0] === script_1.OPS.OP_RETURN &&
         buffer[1] === 0x24 &&
-    buffer.slice(2, 6).equals(HEADER)
+        buffer.slice(2, 6).equals(HEADER));
 }
-
-check.toJSON = function () { return 'Witness commitment output' }
-
+exports.check = check;
+check.toJSON = () => {
+    return 'Witness commitment output';
+};
 function encode(commitment) {
-  typeforce(types.Hash256bit, commitment)
-
-  const buffer = Buffer.allocUnsafe(36)
-  HEADER.copy(buffer, 0)
-  commitment.copy(buffer, 4)
-
-  return bscript.compile([OPS.OP_RETURN, buffer])
+    typeforce(types.Hash256bit, commitment);
+    const buffer = Buffer.allocUnsafe(36);
+    HEADER.copy(buffer, 0);
+    commitment.copy(buffer, 4);
+    return bscript.compile([script_1.OPS.OP_RETURN, buffer]);
 }
-
+exports.encode = encode;
 function decode(buffer) {
-  typeforce(check, buffer)
-
-  return bscript.decompile(buffer)[1].slice(4, 36)
-}
-
-module.exports = {
-  check: check,
-  decode: decode,
-  encode: encode
+    typeforce(check, buffer);
+    return bscript.decompile(buffer)[1].slice(4, 36);
 }
+exports.decode = decode;

src/templates/witnesspubkeyhash/index.js

@@ -1,4 +1,6 @@
-module.exports = {
-  input: require('./input'),
-  output: require('./output')
-}
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const input = require("./input");
+exports.input = input;
+const output = require("./output");
+exports.output = output;

src/templates/witnesspubkeyhash/input.js

@@ -1,18 +1,17 @@
+"use strict";
 // {signature} {pubKey}
-
-const bscript = require('../../script')
-
+Object.defineProperty(exports, "__esModule", { value: true });
+const bscript = require("../../script");
 function isCompressedCanonicalPubKey(pubKey) {
-  return bscript.isCanonicalPubKey(pubKey) && pubKey.length === 33
+    return bscript.isCanonicalPubKey(pubKey) && pubKey.length === 33;
 }
-
 function check(script) {
-  const chunks = bscript.decompile(script)
-
-  return chunks.length === 2 &&
+    const chunks = bscript.decompile(script);
+    return (chunks.length === 2 &&
         bscript.isCanonicalScriptSignature(chunks[0]) &&
-    isCompressedCanonicalPubKey(chunks[1])
+        isCompressedCanonicalPubKey(chunks[1]));
 }
-check.toJSON = function () { return 'witnessPubKeyHash input' }
-
-module.exports = { check }
+exports.check = check;
+check.toJSON = () => {
+    return 'witnessPubKeyHash input';
+};

src/templates/witnesspubkeyhash/output.js

@@ -1,17 +1,13 @@
+"use strict";
 // OP_0 {pubKeyHash}
-
-const bscript = require('../../script')
-const OPS = require('bitcoin-ops')
-
+Object.defineProperty(exports, "__esModule", { value: true });
+const bscript = require("../../script");
+const script_1 = require("../../script");
 function check(script) {
-  const buffer = bscript.compile(script)
-
-  return buffer.length === 22 &&
-    buffer[0] === OPS.OP_0 &&
-    buffer[1] === 0x14
-}
-check.toJSON = function () { return 'Witness pubKeyHash output' }
-
-module.exports = {
-  check
+    const buffer = bscript.compile(script);
+    return buffer.length === 22 && buffer[0] === script_1.OPS.OP_0 && buffer[1] === 0x14;
 }
+exports.check = check;
+check.toJSON = () => {
+    return 'Witness pubKeyHash output';
+};

src/templates/witnessscripthash/index.js

@@ -1,4 +1,6 @@
-module.exports = {
-  input: require('./input'),
-  output: require('./output')
-}
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const input = require("./input");
+exports.input = input;
+const output = require("./output");
+exports.output = output;

src/templates/witnessscripthash/input.js

@@ -1,39 +1,36 @@
+"use strict";
 // <scriptSig> {serialized scriptPubKey script}
-
-const bscript = require('../../script')
-const types = require('../../types')
-const typeforce = require('typeforce')
-
-const p2ms = require('../multisig/')
-const p2pk = require('../pubkey/')
-const p2pkh = require('../pubkeyhash/')
-
+Object.defineProperty(exports, "__esModule", { value: true });
+const bscript = require("../../script");
+const typeforce = require('typeforce');
+const p2ms = require("../multisig");
+const p2pk = require("../pubkey");
+const p2pkh = require("../pubkeyhash");
 function check(chunks, allowIncomplete) {
-  typeforce(types.Array, chunks)
-  if (chunks.length < 1) return false
-
-  const witnessScript = chunks[chunks.length - 1]
-  if (!Buffer.isBuffer(witnessScript)) return false
-
-  const witnessScriptChunks = bscript.decompile(witnessScript)
-
+    typeforce(typeforce.Array, chunks);
+    if (chunks.length < 1)
+        return false;
+    const witnessScript = chunks[chunks.length - 1];
+    if (!Buffer.isBuffer(witnessScript))
+        return false;
+    const witnessScriptChunks = bscript.decompile(witnessScript);
     // is witnessScript a valid script?
-  if (!witnessScriptChunks || witnessScriptChunks.length === 0) return false
-
-  const witnessRawScriptSig = bscript.compile(chunks.slice(0, -1))
-
+    if (!witnessScriptChunks || witnessScriptChunks.length === 0)
+        return false;
+    const witnessRawScriptSig = bscript.compile(chunks.slice(0, -1));
     // match types
     if (p2pkh.input.check(witnessRawScriptSig) &&
-    p2pkh.output.check(witnessScriptChunks)) return true
-
+        p2pkh.output.check(witnessScriptChunks))
+        return true;
     if (p2ms.input.check(witnessRawScriptSig, allowIncomplete) &&
-    p2ms.output.check(witnessScriptChunks)) return true
-
+        p2ms.output.check(witnessScriptChunks))
+        return true;
     if (p2pk.input.check(witnessRawScriptSig) &&
-    p2pk.output.check(witnessScriptChunks)) return true
-
-  return false
+        p2pk.output.check(witnessScriptChunks))
+        return true;
+    return false;
 }
-check.toJSON = function () { return 'witnessScriptHash input' }
-
-module.exports = { check }
+exports.check = check;
+check.toJSON = () => {
+    return 'witnessScriptHash input';
+};

src/templates/witnessscripthash/output.js

@@ -1,15 +1,13 @@
+"use strict";
 // OP_0 {scriptHash}
-
-const bscript = require('../../script')
-const OPS = require('bitcoin-ops')
-
+Object.defineProperty(exports, "__esModule", { value: true });
+const bscript = require("../../script");
+const script_1 = require("../../script");
 function check(script) {
-  const buffer = bscript.compile(script)
-
-  return buffer.length === 34 &&
-    buffer[0] === OPS.OP_0 &&
-    buffer[1] === 0x20
+    const buffer = bscript.compile(script);
+    return buffer.length === 34 && buffer[0] === script_1.OPS.OP_0 && buffer[1] === 0x20;
 }
-check.toJSON = function () { return 'Witness scriptHash output' }
-
-module.exports = { check }
+exports.check = check;
+check.toJSON = () => {
+    return 'Witness scriptHash output';
+};

src/transaction.js

@@ -1,248 +1,194 @@
-const Buffer = require('safe-buffer').Buffer
-const bcrypto = require('./crypto')
-const bscript = require('./script')
-const bufferutils = require('./bufferutils')
-const opcodes = require('bitcoin-ops')
-const typeforce = require('typeforce')
-const types = require('./types')
-const varuint = require('varuint-bitcoin')
-
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const bufferutils = require("./bufferutils");
+const bufferutils_1 = require("./bufferutils");
+const bcrypto = require("./crypto");
+const bscript = require("./script");
+const script_1 = require("./script");
+const types = require("./types");
+const typeforce = require('typeforce');
+const varuint = require('varuint-bitcoin');
 function varSliceSize(someScript) {
-  const length = someScript.length
-
-  return varuint.encodingLength(length) + length
+    const length = someScript.length;
+    return varuint.encodingLength(length) + length;
 }
-
 function vectorSize(someVector) {
-  const length = someVector.length
-
-  return varuint.encodingLength(length) + someVector.reduce(function (sum, witness) {
-    return sum + varSliceSize(witness)
-  }, 0)
+    const length = someVector.length;
+    return (varuint.encodingLength(length) +
+        someVector.reduce((sum, witness) => {
+            return sum + varSliceSize(witness);
+        }, 0));
 }
-
-function Transaction () {
-  this.version = 1
-  this.locktime = 0
-  this.ins = []
-  this.outs = []
-}
-
-Transaction.DEFAULT_SEQUENCE = 0xffffffff
-Transaction.SIGHASH_ALL = 0x01
-Transaction.SIGHASH_NONE = 0x02
-Transaction.SIGHASH_SINGLE = 0x03
-Transaction.SIGHASH_ANYONECANPAY = 0x80
-Transaction.ADVANCED_TRANSACTION_MARKER = 0x00
-Transaction.ADVANCED_TRANSACTION_FLAG = 0x01
-
-const EMPTY_SCRIPT = Buffer.allocUnsafe(0)
-const EMPTY_WITNESS = []
-const ZERO = Buffer.from('0000000000000000000000000000000000000000000000000000000000000000', 'hex')
-const ONE = Buffer.from('0000000000000000000000000000000000000000000000000000000000000001', 'hex')
-const VALUE_UINT64_MAX = Buffer.from('ffffffffffffffff', 'hex')
+const EMPTY_SCRIPT = Buffer.allocUnsafe(0);
+const EMPTY_WITNESS = [];
+const ZERO = Buffer.from('0000000000000000000000000000000000000000000000000000000000000000', 'hex');
+const ONE = Buffer.from('0000000000000000000000000000000000000000000000000000000000000001', 'hex');
+const VALUE_UINT64_MAX = Buffer.from('ffffffffffffffff', 'hex');
 const BLANK_OUTPUT = {
     script: EMPTY_SCRIPT,
-  valueBuffer: VALUE_UINT64_MAX
+    valueBuffer: VALUE_UINT64_MAX,
+};
+function isOutput(out) {
+    return out.value !== undefined;
 }
-
-Transaction.fromBuffer = function (buffer, __noStrict) {
-  let offset = 0
+class Transaction {
+    constructor() {
+        this.version = 1;
+        this.locktime = 0;
+        this.ins = [];
+        this.outs = [];
+    }
+    static fromBuffer(buffer, _NO_STRICT) {
+        let offset = 0;
         function readSlice(n) {
-    offset += n
-    return buffer.slice(offset - n, offset)
+            offset += n;
+            return buffer.slice(offset - n, offset);
         }
-
         function readUInt32() {
-    const i = buffer.readUInt32LE(offset)
-    offset += 4
-    return i
+            const i = buffer.readUInt32LE(offset);
+            offset += 4;
+            return i;
         }
-
         function readInt32() {
-    const i = buffer.readInt32LE(offset)
-    offset += 4
-    return i
+            const i = buffer.readInt32LE(offset);
+            offset += 4;
+            return i;
         }
-
         function readUInt64() {
-    const i = bufferutils.readUInt64LE(buffer, offset)
-    offset += 8
-    return i
+            const i = bufferutils.readUInt64LE(buffer, offset);
+            offset += 8;
+            return i;
         }
-
         function readVarInt() {
-    const vi = varuint.decode(buffer, offset)
-    offset += varuint.decode.bytes
-    return vi
+            const vi = varuint.decode(buffer, offset);
+            offset += varuint.decode.bytes;
+            return vi;
         }
-
         function readVarSlice() {
-    return readSlice(readVarInt())
+            return readSlice(readVarInt());
         }
-
         function readVector() {
-    const count = readVarInt()
-    const vector = []
-    for (var i = 0; i < count; i++) vector.push(readVarSlice())
-    return vector
+            const count = readVarInt();
+            const vector = [];
+            for (let i = 0; i < count; i++)
+                vector.push(readVarSlice());
+            return vector;
         }
-
-  const tx = new Transaction()
-  tx.version = readInt32()
-
-  const marker = buffer.readUInt8(offset)
-  const flag = buffer.readUInt8(offset + 1)
-
-  let hasWitnesses = false
+        const tx = new Transaction();
+        tx.version = readInt32();
+        const marker = buffer.readUInt8(offset);
+        const flag = buffer.readUInt8(offset + 1);
+        let hasWitnesses = false;
         if (marker === Transaction.ADVANCED_TRANSACTION_MARKER &&
             flag === Transaction.ADVANCED_TRANSACTION_FLAG) {
-    offset += 2
-    hasWitnesses = true
+            offset += 2;
+            hasWitnesses = true;
         }
-
-  const vinLen = readVarInt()
-  for (var i = 0; i < vinLen; ++i) {
+        const vinLen = readVarInt();
+        for (let i = 0; i < vinLen; ++i) {
             tx.ins.push({
                 hash: readSlice(32),
                 index: readUInt32(),
                 script: readVarSlice(),
                 sequence: readUInt32(),
-      witness: EMPTY_WITNESS
-    })
+                witness: EMPTY_WITNESS,
+            });
         }
-
-  const voutLen = readVarInt()
-  for (i = 0; i < voutLen; ++i) {
+        const voutLen = readVarInt();
+        for (let i = 0; i < voutLen; ++i) {
             tx.outs.push({
                 value: readUInt64(),
-      script: readVarSlice()
-    })
+                script: readVarSlice(),
+            });
         }
-
         if (hasWitnesses) {
-    for (i = 0; i < vinLen; ++i) {
-      tx.ins[i].witness = readVector()
+            for (let i = 0; i < vinLen; ++i) {
+                tx.ins[i].witness = readVector();
             }
-
             // was this pointless?
-    if (!tx.hasWitnesses()) throw new Error('Transaction has superfluous witness data')
+            if (!tx.hasWitnesses())
+                throw new Error('Transaction has superfluous witness data');
         }
-
-  tx.locktime = readUInt32()
-
-  if (__noStrict) return tx
-  if (offset !== buffer.length) throw new Error('Transaction has unexpected data')
-
-  return tx
+        tx.locktime = readUInt32();
+        if (_NO_STRICT)
+            return tx;
+        if (offset !== buffer.length)
+            throw new Error('Transaction has unexpected data');
+        return tx;
     }
-
-Transaction.fromHex = function (hex) {
-  return Transaction.fromBuffer(Buffer.from(hex, 'hex'))
+    static fromHex(hex) {
+        return Transaction.fromBuffer(Buffer.from(hex, 'hex'), false);
     }
-
-Transaction.isCoinbaseHash = function (buffer) {
-  typeforce(types.Hash256bit, buffer)
-  for (var i = 0; i < 32; ++i) {
-    if (buffer[i] !== 0) return false
+    static isCoinbaseHash(buffer) {
+        typeforce(types.Hash256bit, buffer);
+        for (let i = 0; i < 32; ++i) {
+            if (buffer[i] !== 0)
+                return false;
         }
-  return true
+        return true;
     }
-
-Transaction.prototype.isCoinbase = function () {
-  return this.ins.length === 1 && Transaction.isCoinbaseHash(this.ins[0].hash)
+    isCoinbase() {
+        return (this.ins.length === 1 && Transaction.isCoinbaseHash(this.ins[0].hash));
     }
-
-Transaction.prototype.addInput = function (hash, index, sequence, scriptSig) {
-  typeforce(types.tuple(
-    types.Hash256bit,
-    types.UInt32,
-    types.maybe(types.UInt32),
-    types.maybe(types.Buffer)
-  ), arguments)
-
+    addInput(hash, index, sequence, scriptSig) {
+        typeforce(types.tuple(types.Hash256bit, types.UInt32, types.maybe(types.UInt32), types.maybe(types.Buffer)), arguments);
         if (types.Null(sequence)) {
-    sequence = Transaction.DEFAULT_SEQUENCE
+            sequence = Transaction.DEFAULT_SEQUENCE;
         }
-
         // Add the input and return the input's index
         return (this.ins.push({
-    hash: hash,
-    index: index,
+            hash,
+            index,
             script: scriptSig || EMPTY_SCRIPT,
             sequence: sequence,
-    witness: EMPTY_WITNESS
-  }) - 1)
+            witness: EMPTY_WITNESS,
+        }) - 1);
     }
-
-Transaction.prototype.addOutput = function (scriptPubKey, value) {
-  typeforce(types.tuple(types.Buffer, types.Satoshi), arguments)
-
+    addOutput(scriptPubKey, value) {
+        typeforce(types.tuple(types.Buffer, types.Satoshi), arguments);
         // Add the output and return the output's index
         return (this.outs.push({
             script: scriptPubKey,
-    value: value
-  }) - 1)
+            value,
+        }) - 1);
     }
-
-Transaction.prototype.hasWitnesses = function () {
-  return this.ins.some(function (x) {
-    return x.witness.length !== 0
-  })
+    hasWitnesses() {
+        return this.ins.some(x => {
+            return x.witness.length !== 0;
+        });
     }
-
-Transaction.prototype.weight = function () {
-  const base = this.__byteLength(false)
-  const total = this.__byteLength(true)
-  return base * 3 + total
+    weight() {
+        const base = this.__byteLength(false);
+        const total = this.__byteLength(true);
+        return base * 3 + total;
     }
-
-Transaction.prototype.virtualSize = function () {
-  return Math.ceil(this.weight() / 4)
+    virtualSize() {
+        return Math.ceil(this.weight() / 4);
     }
-
-Transaction.prototype.byteLength = function () {
-  return this.__byteLength(true)
+    byteLength() {
+        return this.__byteLength(true);
     }
-
-Transaction.prototype.__byteLength = function (__allowWitness) {
-  const hasWitnesses = __allowWitness && this.hasWitnesses()
-
-  return (
-    (hasWitnesses ? 10 : 8) +
-    varuint.encodingLength(this.ins.length) +
-    varuint.encodingLength(this.outs.length) +
-    this.ins.reduce(function (sum, input) { return sum + 40 + varSliceSize(input.script) }, 0) +
-    this.outs.reduce(function (sum, output) { return sum + 8 + varSliceSize(output.script) }, 0) +
-    (hasWitnesses ? this.ins.reduce(function (sum, input) { return sum + vectorSize(input.witness) }, 0) : 0)
-  )
-}
-
-Transaction.prototype.clone = function () {
-  const newTx = new Transaction()
-  newTx.version = this.version
-  newTx.locktime = this.locktime
-
-  newTx.ins = this.ins.map(function (txIn) {
+    clone() {
+        const newTx = new Transaction();
+        newTx.version = this.version;
+        newTx.locktime = this.locktime;
+        newTx.ins = this.ins.map(txIn => {
             return {
                 hash: txIn.hash,
                 index: txIn.index,
                 script: txIn.script,
                 sequence: txIn.sequence,
-      witness: txIn.witness
-    }
-  })
-
-  newTx.outs = this.outs.map(function (txOut) {
+                witness: txIn.witness,
+            };
+        });
+        newTx.outs = this.outs.map(txOut => {
             return {
                 script: txOut.script,
-      value: txOut.value
+                value: txOut.value,
+            };
+        });
+        return newTx;
     }
-  })
-
-  return newTx
-}
-
     /**
      * Hash transaction for signing a specific input.
      *
@@ -251,242 +197,256 @@ Transaction.prototype.clone = function () {
      * hashType, and then hashes the result.
      * This hash can then be used to sign the provided transaction input.
      */
-Transaction.prototype.hashForSignature = function (inIndex, prevOutScript, hashType) {
-  typeforce(types.tuple(types.UInt32, types.Buffer, /* types.UInt8 */ types.Number), arguments)
-
+    hashForSignature(inIndex, prevOutScript, hashType) {
+        typeforce(types.tuple(types.UInt32, types.Buffer, /* types.UInt8 */ types.Number), arguments);
         // https://github.com/bitcoin/bitcoin/blob/master/src/test/sighash_tests.cpp#L29
-  if (inIndex >= this.ins.length) return ONE
-
+        if (inIndex >= this.ins.length)
+            return ONE;
         // ignore OP_CODESEPARATOR
-  const ourScript = bscript.compile(bscript.decompile(prevOutScript).filter(function (x) {
-    return x !== opcodes.OP_CODESEPARATOR
-  }))
-
-  const txTmp = this.clone()
-
+        const ourScript = bscript.compile(bscript.decompile(prevOutScript).filter(x => {
+            return x !== script_1.OPS.OP_CODESEPARATOR;
+        }));
+        const txTmp = this.clone();
         // SIGHASH_NONE: ignore all outputs? (wildcard payee)
         if ((hashType & 0x1f) === Transaction.SIGHASH_NONE) {
-    txTmp.outs = []
-
+            txTmp.outs = [];
             // ignore sequence numbers (except at inIndex)
-    txTmp.ins.forEach(function (input, i) {
-      if (i === inIndex) return
-
-      input.sequence = 0
-    })
-
+            txTmp.ins.forEach((input, i) => {
+                if (i === inIndex)
+                    return;
+                input.sequence = 0;
+            });
             // SIGHASH_SINGLE: ignore all outputs, except at the same index?
-  } else if ((hashType & 0x1f) === Transaction.SIGHASH_SINGLE) {
+        }
+        else if ((hashType & 0x1f) === Transaction.SIGHASH_SINGLE) {
             // https://github.com/bitcoin/bitcoin/blob/master/src/test/sighash_tests.cpp#L60
-    if (inIndex >= this.outs.length) return ONE
-
+            if (inIndex >= this.outs.length)
+                return ONE;
             // truncate outputs after
-    txTmp.outs.length = inIndex + 1
-
+            txTmp.outs.length = inIndex + 1;
             // "blank" outputs before
-    for (var i = 0; i < inIndex; i++) {
-      txTmp.outs[i] = BLANK_OUTPUT
+            for (let i = 0; i < inIndex; i++) {
+                txTmp.outs[i] = BLANK_OUTPUT;
             }
-
             // ignore sequence numbers (except at inIndex)
-    txTmp.ins.forEach(function (input, y) {
-      if (y === inIndex) return
-
-      input.sequence = 0
-    })
+            txTmp.ins.forEach((input, y) => {
+                if (y === inIndex)
+                    return;
+                input.sequence = 0;
+            });
         }
-
         // SIGHASH_ANYONECANPAY: ignore inputs entirely?
         if (hashType & Transaction.SIGHASH_ANYONECANPAY) {
-    txTmp.ins = [txTmp.ins[inIndex]]
-    txTmp.ins[0].script = ourScript
-
+            txTmp.ins = [txTmp.ins[inIndex]];
+            txTmp.ins[0].script = ourScript;
             // SIGHASH_ALL: only ignore input scripts
-  } else {
+        }
+        else {
             // "blank" others input scripts
-    txTmp.ins.forEach(function (input) { input.script = EMPTY_SCRIPT })
-    txTmp.ins[inIndex].script = ourScript
+            txTmp.ins.forEach(input => {
+                input.script = EMPTY_SCRIPT;
+            });
+            txTmp.ins[inIndex].script = ourScript;
         }
-
         // serialize and hash
-  const buffer = Buffer.allocUnsafe(txTmp.__byteLength(false) + 4)
-  buffer.writeInt32LE(hashType, buffer.length - 4)
-  txTmp.__toBuffer(buffer, 0, false)
-
-  return bcrypto.hash256(buffer)
+        const buffer = Buffer.allocUnsafe(txTmp.__byteLength(false) + 4);
+        buffer.writeInt32LE(hashType, buffer.length - 4);
+        txTmp.__toBuffer(buffer, 0, false);
+        return bcrypto.hash256(buffer);
+    }
+    hashForWitnessV0(inIndex, prevOutScript, value, hashType) {
+        typeforce(types.tuple(types.UInt32, types.Buffer, types.Satoshi, types.UInt32), arguments);
+        let tbuffer = Buffer.from([]);
+        let toffset = 0;
+        function writeSlice(slice) {
+            toffset += slice.copy(tbuffer, toffset);
+        }
+        function writeUInt32(i) {
+            toffset = tbuffer.writeUInt32LE(i, toffset);
+        }
+        function writeUInt64(i) {
+            toffset = bufferutils.writeUInt64LE(tbuffer, i, toffset);
         }
-
-Transaction.prototype.hashForWitnessV0 = function (inIndex, prevOutScript, value, hashType) {
-  typeforce(types.tuple(types.UInt32, types.Buffer, types.Satoshi, types.UInt32), arguments)
-
-  let tbuffer, toffset
-  function writeSlice (slice) { toffset += slice.copy(tbuffer, toffset) }
-  function writeUInt32 (i) { toffset = tbuffer.writeUInt32LE(i, toffset) }
-  function writeUInt64 (i) { toffset = bufferutils.writeUInt64LE(tbuffer, i, toffset) }
         function writeVarInt(i) {
-    varuint.encode(i, tbuffer, toffset)
-    toffset += varuint.encode.bytes
+            varuint.encode(i, tbuffer, toffset);
+            toffset += varuint.encode.bytes;
         }
-  function writeVarSlice (slice) { writeVarInt(slice.length); writeSlice(slice) }
-
-  let hashOutputs = ZERO
-  let hashPrevouts = ZERO
-  let hashSequence = ZERO
-
+        function writeVarSlice(slice) {
+            writeVarInt(slice.length);
+            writeSlice(slice);
+        }
+        let hashOutputs = ZERO;
+        let hashPrevouts = ZERO;
+        let hashSequence = ZERO;
         if (!(hashType & Transaction.SIGHASH_ANYONECANPAY)) {
-    tbuffer = Buffer.allocUnsafe(36 * this.ins.length)
-    toffset = 0
-
-    this.ins.forEach(function (txIn) {
-      writeSlice(txIn.hash)
-      writeUInt32(txIn.index)
-    })
-
-    hashPrevouts = bcrypto.hash256(tbuffer)
+            tbuffer = Buffer.allocUnsafe(36 * this.ins.length);
+            toffset = 0;
+            this.ins.forEach(txIn => {
+                writeSlice(txIn.hash);
+                writeUInt32(txIn.index);
+            });
+            hashPrevouts = bcrypto.hash256(tbuffer);
         }
-
         if (!(hashType & Transaction.SIGHASH_ANYONECANPAY) &&
             (hashType & 0x1f) !== Transaction.SIGHASH_SINGLE &&
             (hashType & 0x1f) !== Transaction.SIGHASH_NONE) {
-    tbuffer = Buffer.allocUnsafe(4 * this.ins.length)
-    toffset = 0
-
-    this.ins.forEach(function (txIn) {
-      writeUInt32(txIn.sequence)
-    })
-
-    hashSequence = bcrypto.hash256(tbuffer)
+            tbuffer = Buffer.allocUnsafe(4 * this.ins.length);
+            toffset = 0;
+            this.ins.forEach(txIn => {
+                writeUInt32(txIn.sequence);
+            });
+            hashSequence = bcrypto.hash256(tbuffer);
         }
-
         if ((hashType & 0x1f) !== Transaction.SIGHASH_SINGLE &&
             (hashType & 0x1f) !== Transaction.SIGHASH_NONE) {
-    const txOutsSize = this.outs.reduce(function (sum, output) {
-      return sum + 8 + varSliceSize(output.script)
-    }, 0)
-
-    tbuffer = Buffer.allocUnsafe(txOutsSize)
-    toffset = 0
-
-    this.outs.forEach(function (out) {
-      writeUInt64(out.value)
-      writeVarSlice(out.script)
-    })
-
-    hashOutputs = bcrypto.hash256(tbuffer)
-  } else if ((hashType & 0x1f) === Transaction.SIGHASH_SINGLE && inIndex < this.outs.length) {
-    const output = this.outs[inIndex]
-
-    tbuffer = Buffer.allocUnsafe(8 + varSliceSize(output.script))
-    toffset = 0
-    writeUInt64(output.value)
-    writeVarSlice(output.script)
-
-    hashOutputs = bcrypto.hash256(tbuffer)
+            const txOutsSize = this.outs.reduce((sum, output) => {
+                return sum + 8 + varSliceSize(output.script);
+            }, 0);
+            tbuffer = Buffer.allocUnsafe(txOutsSize);
+            toffset = 0;
+            this.outs.forEach(out => {
+                writeUInt64(out.value);
+                writeVarSlice(out.script);
+            });
+            hashOutputs = bcrypto.hash256(tbuffer);
         }
-
-  tbuffer = Buffer.allocUnsafe(156 + varSliceSize(prevOutScript))
-  toffset = 0
-
-  const input = this.ins[inIndex]
-  writeUInt32(this.version)
-  writeSlice(hashPrevouts)
-  writeSlice(hashSequence)
-  writeSlice(input.hash)
-  writeUInt32(input.index)
-  writeVarSlice(prevOutScript)
-  writeUInt64(value)
-  writeUInt32(input.sequence)
-  writeSlice(hashOutputs)
-  writeUInt32(this.locktime)
-  writeUInt32(hashType)
-  return bcrypto.hash256(tbuffer)
+        else if ((hashType & 0x1f) === Transaction.SIGHASH_SINGLE &&
+            inIndex < this.outs.length) {
+            const output = this.outs[inIndex];
+            tbuffer = Buffer.allocUnsafe(8 + varSliceSize(output.script));
+            toffset = 0;
+            writeUInt64(output.value);
+            writeVarSlice(output.script);
+            hashOutputs = bcrypto.hash256(tbuffer);
         }
-
-Transaction.prototype.getHash = function () {
-  return bcrypto.hash256(this.__toBuffer(undefined, undefined, false))
+        tbuffer = Buffer.allocUnsafe(156 + varSliceSize(prevOutScript));
+        toffset = 0;
+        const input = this.ins[inIndex];
+        writeUInt32(this.version);
+        writeSlice(hashPrevouts);
+        writeSlice(hashSequence);
+        writeSlice(input.hash);
+        writeUInt32(input.index);
+        writeVarSlice(prevOutScript);
+        writeUInt64(value);
+        writeUInt32(input.sequence);
+        writeSlice(hashOutputs);
+        writeUInt32(this.locktime);
+        writeUInt32(hashType);
+        return bcrypto.hash256(tbuffer);
     }
-
-Transaction.prototype.getId = function () {
+    getHash(forWitness) {
+        // wtxid for coinbase is always 32 bytes of 0x00
+        if (forWitness && this.isCoinbase())
+            return Buffer.alloc(32, 0);
+        return bcrypto.hash256(this.__toBuffer(undefined, undefined, forWitness));
+    }
+    getId() {
         // transaction hash's are displayed in reverse order
-  return this.getHash().reverse().toString('hex')
+        return bufferutils_1.reverseBuffer(this.getHash(false)).toString('hex');
     }
-
-Transaction.prototype.toBuffer = function (buffer, initialOffset) {
-  return this.__toBuffer(buffer, initialOffset, true)
+    toBuffer(buffer, initialOffset) {
+        return this.__toBuffer(buffer, initialOffset, true);
+    }
+    toHex() {
+        return this.toBuffer(undefined, undefined).toString('hex');
+    }
+    setInputScript(index, scriptSig) {
+        typeforce(types.tuple(types.Number, types.Buffer), arguments);
+        this.ins[index].script = scriptSig;
+    }
+    setWitness(index, witness) {
+        typeforce(types.tuple(types.Number, [types.Buffer]), arguments);
+        this.ins[index].witness = witness;
+    }
+    __byteLength(_ALLOW_WITNESS) {
+        const hasWitnesses = _ALLOW_WITNESS && this.hasWitnesses();
+        return ((hasWitnesses ? 10 : 8) +
+            varuint.encodingLength(this.ins.length) +
+            varuint.encodingLength(this.outs.length) +
+            this.ins.reduce((sum, input) => {
+                return sum + 40 + varSliceSize(input.script);
+            }, 0) +
+            this.outs.reduce((sum, output) => {
+                return sum + 8 + varSliceSize(output.script);
+            }, 0) +
+            (hasWitnesses
+                ? this.ins.reduce((sum, input) => {
+                    return sum + vectorSize(input.witness);
+                }, 0)
+                : 0));
+    }
+    __toBuffer(buffer, initialOffset, _ALLOW_WITNESS) {
+        if (!buffer)
+            buffer = Buffer.allocUnsafe(this.__byteLength(_ALLOW_WITNESS));
+        let offset = initialOffset || 0;
+        function writeSlice(slice) {
+            offset += slice.copy(buffer, offset);
+        }
+        function writeUInt8(i) {
+            offset = buffer.writeUInt8(i, offset);
+        }
+        function writeUInt32(i) {
+            offset = buffer.writeUInt32LE(i, offset);
+        }
+        function writeInt32(i) {
+            offset = buffer.writeInt32LE(i, offset);
+        }
+        function writeUInt64(i) {
+            offset = bufferutils.writeUInt64LE(buffer, i, offset);
         }
-
-Transaction.prototype.__toBuffer = function (buffer, initialOffset, __allowWitness) {
-  if (!buffer) buffer = Buffer.allocUnsafe(this.__byteLength(__allowWitness))
-
-  let offset = initialOffset || 0
-  function writeSlice (slice) { offset += slice.copy(buffer, offset) }
-  function writeUInt8 (i) { offset = buffer.writeUInt8(i, offset) }
-  function writeUInt32 (i) { offset = buffer.writeUInt32LE(i, offset) }
-  function writeInt32 (i) { offset = buffer.writeInt32LE(i, offset) }
-  function writeUInt64 (i) { offset = bufferutils.writeUInt64LE(buffer, i, offset) }
         function writeVarInt(i) {
-    varuint.encode(i, buffer, offset)
-    offset += varuint.encode.bytes
+            varuint.encode(i, buffer, offset);
+            offset += varuint.encode.bytes;
         }
-  function writeVarSlice (slice) { writeVarInt(slice.length); writeSlice(slice) }
-  function writeVector (vector) { writeVarInt(vector.length); vector.forEach(writeVarSlice) }
-
-  writeInt32(this.version)
-
-  const hasWitnesses = __allowWitness && this.hasWitnesses()
-
+        function writeVarSlice(slice) {
+            writeVarInt(slice.length);
+            writeSlice(slice);
+        }
+        function writeVector(vector) {
+            writeVarInt(vector.length);
+            vector.forEach(writeVarSlice);
+        }
+        writeInt32(this.version);
+        const hasWitnesses = _ALLOW_WITNESS && this.hasWitnesses();
         if (hasWitnesses) {
-    writeUInt8(Transaction.ADVANCED_TRANSACTION_MARKER)
-    writeUInt8(Transaction.ADVANCED_TRANSACTION_FLAG)
+            writeUInt8(Transaction.ADVANCED_TRANSACTION_MARKER);
+            writeUInt8(Transaction.ADVANCED_TRANSACTION_FLAG);
         }
-
-  writeVarInt(this.ins.length)
-
-  this.ins.forEach(function (txIn) {
-    writeSlice(txIn.hash)
-    writeUInt32(txIn.index)
-    writeVarSlice(txIn.script)
-    writeUInt32(txIn.sequence)
-  })
-
-  writeVarInt(this.outs.length)
-  this.outs.forEach(function (txOut) {
-    if (!txOut.valueBuffer) {
-      writeUInt64(txOut.value)
-    } else {
-      writeSlice(txOut.valueBuffer)
+        writeVarInt(this.ins.length);
+        this.ins.forEach(txIn => {
+            writeSlice(txIn.hash);
+            writeUInt32(txIn.index);
+            writeVarSlice(txIn.script);
+            writeUInt32(txIn.sequence);
+        });
+        writeVarInt(this.outs.length);
+        this.outs.forEach(txOut => {
+            if (isOutput(txOut)) {
+                writeUInt64(txOut.value);
             }
-
-    writeVarSlice(txOut.script)
-  })
-
+            else {
+                writeSlice(txOut.valueBuffer);
+            }
+            writeVarSlice(txOut.script);
+        });
         if (hasWitnesses) {
-    this.ins.forEach(function (input) {
-      writeVector(input.witness)
-    })
+            this.ins.forEach(input => {
+                writeVector(input.witness);
+            });
         }
-
-  writeUInt32(this.locktime)
-
+        writeUInt32(this.locktime);
         // avoid slicing unless necessary
-  if (initialOffset !== undefined) return buffer.slice(initialOffset, offset)
-  return buffer
+        if (initialOffset !== undefined)
+            return buffer.slice(initialOffset, offset);
+        return buffer;
     }
-
-Transaction.prototype.toHex = function () {
-  return this.toBuffer().toString('hex')
 }
-
-Transaction.prototype.setInputScript = function (index, scriptSig) {
-  typeforce(types.tuple(types.Number, types.Buffer), arguments)
-
-  this.ins[index].script = scriptSig
-}
-
-Transaction.prototype.setWitness = function (index, witness) {
-  typeforce(types.tuple(types.Number, [types.Buffer]), arguments)
-
-  this.ins[index].witness = witness
-}
-
-module.exports = Transaction
+Transaction.DEFAULT_SEQUENCE = 0xffffffff;
+Transaction.SIGHASH_ALL = 0x01;
+Transaction.SIGHASH_NONE = 0x02;
+Transaction.SIGHASH_SINGLE = 0x03;
+Transaction.SIGHASH_ANYONECANPAY = 0x80;
+Transaction.ADVANCED_TRANSACTION_MARKER = 0x00;
+Transaction.ADVANCED_TRANSACTION_FLAG = 0x01;
+exports.Transaction = Transaction;

src/types.js

@@ -1,49 +1,50 @@
-const typeforce = require('typeforce')
-
-const UINT31_MAX = Math.pow(2, 31) - 1
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const typeforce = require('typeforce');
+const UINT31_MAX = Math.pow(2, 31) - 1;
 function UInt31(value) {
-  return typeforce.UInt32(value) && value <= UINT31_MAX
+    return typeforce.UInt32(value) && value <= UINT31_MAX;
 }
-
+exports.UInt31 = UInt31;
 function BIP32Path(value) {
-  return typeforce.String(value) && value.match(/^(m\/)?(\d+'?\/)*\d+'?$/)
+    return typeforce.String(value) && !!value.match(/^(m\/)?(\d+'?\/)*\d+'?$/);
 }
-BIP32Path.toJSON = function () { return 'BIP32 derivation path' }
-
-const SATOSHI_MAX = 21 * 1e14
+exports.BIP32Path = BIP32Path;
+BIP32Path.toJSON = () => {
+    return 'BIP32 derivation path';
+};
+const SATOSHI_MAX = 21 * 1e14;
 function Satoshi(value) {
-  return typeforce.UInt53(value) && value <= SATOSHI_MAX
+    return typeforce.UInt53(value) && value <= SATOSHI_MAX;
 }
-
+exports.Satoshi = Satoshi;
 // external dependent types
-const ECPoint = typeforce.quacksLike('Point')
-
+exports.ECPoint = typeforce.quacksLike('Point');
 // exposed, external API
-const Network = typeforce.compile({
+exports.Network = typeforce.compile({
     messagePrefix: typeforce.oneOf(typeforce.Buffer, typeforce.String),
     bip32: {
         public: typeforce.UInt32,
-    private: typeforce.UInt32
+        private: typeforce.UInt32,
     },
     pubKeyHash: typeforce.UInt8,
     scriptHash: typeforce.UInt8,
-  wif: typeforce.UInt8
-})
-
-// extend typeforce types with ours
-const types = {
-  BIP32Path: BIP32Path,
-  Buffer256bit: typeforce.BufferN(32),
-  ECPoint: ECPoint,
-  Hash160bit: typeforce.BufferN(20),
-  Hash256bit: typeforce.BufferN(32),
-  Network: Network,
-  Satoshi: Satoshi,
-  UInt31: UInt31
-}
-
-for (var typeName in typeforce) {
-  types[typeName] = typeforce[typeName]
-}
-
-module.exports = types
+    wif: typeforce.UInt8,
+});
+exports.Buffer256bit = typeforce.BufferN(32);
+exports.Hash160bit = typeforce.BufferN(20);
+exports.Hash256bit = typeforce.BufferN(32);
+exports.Number = typeforce.Number; // tslint:disable-line variable-name
+exports.Array = typeforce.Array;
+exports.Boolean = typeforce.Boolean; // tslint:disable-line variable-name
+exports.String = typeforce.String; // tslint:disable-line variable-name
+exports.Buffer = typeforce.Buffer;
+exports.Hex = typeforce.Hex;
+exports.maybe = typeforce.maybe;
+exports.tuple = typeforce.tuple;
+exports.UInt8 = typeforce.UInt8;
+exports.UInt32 = typeforce.UInt32;
+exports.Function = typeforce.Function;
+exports.BufferN = typeforce.BufferN;
+exports.Null = typeforce.Null;
+exports.oneOf = typeforce.oneOf;

test/block.js

@@ -1,6 +1,6 @@
 const { describe, it, beforeEach } = require('mocha')
 const assert = require('assert')
-const Block = require('../src/block')
+const Block = require('..').Block
 
 const fixtures = require('./fixtures/block')
 
@@ -32,6 +32,9 @@ describe('Block', function () {
         assert.strictEqual(block.version, f.version)
         assert.strictEqual(block.prevHash.toString('hex'), f.prevHash)
         assert.strictEqual(block.merkleRoot.toString('hex'), f.merkleRoot)
+        if (block.witnessCommit) {
+          assert.strictEqual(block.witnessCommit.toString('hex'), f.witnessCommit)
+        }
         assert.strictEqual(block.timestamp, f.timestamp)
         assert.strictEqual(block.bits, f.bits)
         assert.strictEqual(block.nonce, f.nonce)
@@ -113,10 +116,16 @@ describe('Block', function () {
       it('returns ' + f.merkleRoot + ' for ' + f.id, function () {
         assert.strictEqual(Block.calculateMerkleRoot(block.transactions).toString('hex'), f.merkleRoot)
       })
+
+      if (f.witnessCommit) {
+        it('returns witness commit ' + f.witnessCommit + ' for ' + f.id, function () {
+          assert.strictEqual(Block.calculateMerkleRoot(block.transactions, true).toString('hex'), f.witnessCommit)
+        })
+      }
     })
   })
 
-  describe('checkMerkleRoot', function () {
+  describe('checkTxRoots', function () {
     fixtures.valid.forEach(function (f) {
       if (f.hex.length === 160) return
 
@@ -127,7 +136,7 @@ describe('Block', function () {
       })
 
       it('returns ' + f.valid + ' for ' + f.id, function () {
-        assert.strictEqual(block.checkMerkleRoot(), true)
+        assert.strictEqual(block.checkTxRoots(), true)
       })
     })
   })

test/ecpair.js

@@ -1,5 +1,3 @@
-/* eslint-disable no-new */
-
 const { describe, it, beforeEach } = require('mocha')
 const assert = require('assert')
 const proxyquire = require('proxyquire')
@@ -30,7 +28,7 @@ describe('ECPair', function () {
     })
 
     it('calls pointFromScalar lazily', hoodwink(function () {
-      assert.strictEqual(keyPair.__Q, null)
+      assert.strictEqual(keyPair.__Q, undefined)
 
       // .publicKey forces the memoization
       assert.strictEqual(keyPair.publicKey.toString('hex'), '0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798')
@@ -240,7 +238,7 @@ describe('ECPair', function () {
       }))
 
       it('throws if no private key is found', function () {
-        delete keyPair.__d
+        delete keyPair.__D
 
         assert.throws(function () {
           keyPair.sign(hash)

test/fixtures/block.json

@@ -119,6 +119,21 @@
       "timestamp": 1231006505,
       "valid": true,
       "version": 1
+    },
+    {
+      "description": "Block with witness commit",
+      "bits": 388503969,
+      "hash": "ec61d8d62a4945034a1df40dd3dfda364221c0562c3a14000000000000000000",
+      "height": 542213,
+      "hex": "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",
+      "id": "000000000000000000143a2c56c0214236dadfd30df41d4a0345492ad6d861ec",
+      "merkleRoot": "135e9b653aee9a70028aff2db53d4f43f4484ad52558c3ae300410b79cb6a864",
+      "witnessCommit": "4a657fcaa2149342376247e2e283a55a6b92dcc35d4d89e4ac7b74488cb63be2",
+      "nonce": 31692307,
+      "prevHash": "8980ebb11236bacc66c447d5ad961bc546c0f9cc385a08000000000000000000",
+      "timestamp": 1537429727,
+      "valid": true,
+      "version": 536870912
     }
   ],
   "invalid": [

test/fixtures/transaction_builder.json

@@ -1976,7 +1976,7 @@
     "sign": [
       {
         "description": "Transaction w/ witness value mismatch",
-        "exception": "Input didn\\'t match witnessValue",
+        "exception": "Input did not match witnessValue",
         "network": "testnet",
         "inputs": [
           {

test/payments.js

@@ -4,7 +4,13 @@ const u = require('./payments.utils')
 
 ;['embed', 'p2ms', 'p2pk', 'p2pkh', 'p2sh', 'p2wpkh', 'p2wsh'].forEach(function (p) {
   describe(p, function () {
-    const fn = require('../src/payments/' + p)
+    let fn
+    let payment = require('../src/payments/' + p)
+    if (p === 'embed') {
+      fn = payment.p2data
+    } else {
+      fn = payment[p]
+    }
     const fixtures = require('./fixtures/' + p)
 
     fixtures.valid.forEach(function (f, i) {

test/transaction.js

@@ -2,7 +2,7 @@ const { describe, it, beforeEach } = require('mocha')
 const assert = require('assert')
 const bscript = require('../src/script')
 const fixtures = require('./fixtures/transaction')
-const Transaction = require('../src/transaction')
+const Transaction = require('..').Transaction
 
 describe('Transaction', function () {
   function fromRaw (raw, noWitness) {

test/transaction_builder.js

@@ -5,8 +5,8 @@ const bscript = require('../src/script')
 const payments = require('../src/payments')
 
 const ECPair = require('../src/ecpair')
-const Transaction = require('../src/transaction')
-const TransactionBuilder = require('../src/transaction_builder')
+const Transaction = require('..').Transaction
+const TransactionBuilder = require('..').TransactionBuilder
 const NETWORKS = require('../src/networks')
 
 const fixtures = require('./fixtures/transaction_builder')
@@ -164,7 +164,7 @@ describe('TransactionBuilder', function () {
       const tx = Transaction.fromHex(fixtures.valid.classification.hex)
       const txb = TransactionBuilder.fromTransaction(tx)
 
-      txb.__inputs.forEach(function (i) {
+      txb.__INPUTS.forEach(function (i) {
         assert.strictEqual(i.prevOutType, 'scripthash')
         assert.strictEqual(i.redeemScriptType, 'multisig')
       })
@@ -191,22 +191,22 @@ describe('TransactionBuilder', function () {
       const vin = txb.addInput(txHash, 1, 54)
       assert.strictEqual(vin, 0)
 
-      const txIn = txb.__tx.ins[0]
+      const txIn = txb.__TX.ins[0]
       assert.strictEqual(txIn.hash, txHash)
       assert.strictEqual(txIn.index, 1)
       assert.strictEqual(txIn.sequence, 54)
-      assert.strictEqual(txb.__inputs[0].prevOutScript, undefined)
+      assert.strictEqual(txb.__INPUTS[0].prevOutScript, undefined)
     })
 
     it('accepts a txHash, index [, sequence number and scriptPubKey]', function () {
       const vin = txb.addInput(txHash, 1, 54, scripts[1])
       assert.strictEqual(vin, 0)
 
-      const txIn = txb.__tx.ins[0]
+      const txIn = txb.__TX.ins[0]
       assert.strictEqual(txIn.hash, txHash)
       assert.strictEqual(txIn.index, 1)
       assert.strictEqual(txIn.sequence, 54)
-      assert.strictEqual(txb.__inputs[0].prevOutScript, scripts[1])
+      assert.strictEqual(txb.__INPUTS[0].prevOutScript, scripts[1])
     })
 
     it('accepts a prevTx, index [and sequence number]', function () {
@@ -217,11 +217,11 @@ describe('TransactionBuilder', function () {
       const vin = txb.addInput(prevTx, 1, 54)
       assert.strictEqual(vin, 0)
 
-      const txIn = txb.__tx.ins[0]
+      const txIn = txb.__TX.ins[0]
       assert.deepEqual(txIn.hash, prevTx.getHash())
       assert.strictEqual(txIn.index, 1)
       assert.strictEqual(txIn.sequence, 54)
-      assert.strictEqual(txb.__inputs[0].prevOutScript, scripts[1])
+      assert.strictEqual(txb.__INPUTS[0].prevOutScript, scripts[1])
     })
 
     it('returns the input index', function () {
@@ -251,7 +251,7 @@ describe('TransactionBuilder', function () {
       const vout = txb.addOutput(address, 1000)
       assert.strictEqual(vout, 0)
 
-      const txout = txb.__tx.outs[0]
+      const txout = txb.__TX.outs[0]
       assert.deepEqual(txout.script, scripts[0])
       assert.strictEqual(txout.value, 1000)
     })
@@ -260,7 +260,7 @@ describe('TransactionBuilder', function () {
       const vout = txb.addOutput(scripts[0], 1000)
       assert.strictEqual(vout, 0)
 
-      const txout = txb.__tx.outs[0]
+      const txout = txb.__TX.outs[0]
       assert.deepEqual(txout.script, scripts[0])
       assert.strictEqual(txout.value, 1000)
     })
@@ -533,10 +533,10 @@ describe('TransactionBuilder', function () {
       '194a565cd6aa4cc38b8eaffa343402201c5b4b61d73fa38e49c1ee68cc0e6dfd2f5dae453dd86eb142e87a' +
       '0bafb1bc8401210283409659355b6d1cc3c32decd5d561abaac86c37a353b52895a5e6c196d6f44800000000'
       const txb = TransactionBuilder.fromTransaction(Transaction.fromHex(rawtx))
-      txb.__inputs[0].value = 241530
-      txb.__inputs[1].value = 241530
-      txb.__inputs[2].value = 248920
-      txb.__inputs[3].value = 248920
+      txb.__INPUTS[0].value = 241530
+      txb.__INPUTS[1].value = 241530
+      txb.__INPUTS[2].value = 248920
+      txb.__INPUTS[3].value = 248920
 
       assert.throws(function () {
         txb.build()

ts_src/address.ts

@@ -0,0 +1,119 @@
+import { Network } from './networks';
+import * as networks from './networks';
+import * as payments from './payments';
+import * as bscript from './script';
+import * as types from './types';
+
+const bech32 = require('bech32');
+const bs58check = require('bs58check');
+const typeforce = require('typeforce');
+
+export interface Base58CheckResult {
+  hash: Buffer;
+  version: number;
+}
+
+export interface Bech32Result {
+  version: number;
+  prefix: string;
+  data: Buffer;
+}
+
+export function fromBase58Check(address: string): Base58CheckResult {
+  const payload = bs58check.decode(address);
+
+  // TODO: 4.0.0, move to "toOutputScript"
+  if (payload.length < 21) throw new TypeError(address + ' is too short');
+  if (payload.length > 21) throw new TypeError(address + ' is too long');
+
+  const version = payload.readUInt8(0);
+  const hash = payload.slice(1);
+
+  return { version, hash };
+}
+
+export function fromBech32(address: string): Bech32Result {
+  const result = bech32.decode(address);
+  const data = bech32.fromWords(result.words.slice(1));
+
+  return {
+    version: result.words[0],
+    prefix: result.prefix,
+    data: Buffer.from(data),
+  };
+}
+
+export function toBase58Check(hash: Buffer, version: number): string {
+  typeforce(types.tuple(types.Hash160bit, types.UInt8), arguments);
+
+  const payload = Buffer.allocUnsafe(21);
+  payload.writeUInt8(version, 0);
+  hash.copy(payload, 1);
+
+  return bs58check.encode(payload);
+}
+
+export function toBech32(
+  data: Buffer,
+  version: number,
+  prefix: string,
+): string {
+  const words = bech32.toWords(data);
+  words.unshift(version);
+
+  return bech32.encode(prefix, words);
+}
+
+export function fromOutputScript(output: Buffer, network: Network): string {
+  // TODO: Network
+  network = network || networks.bitcoin;
+
+  try {
+    return payments.p2pkh({ output, network }).address as string;
+  } catch (e) {}
+  try {
+    return payments.p2sh({ output, network }).address as string;
+  } catch (e) {}
+  try {
+    return payments.p2wpkh({ output, network }).address as string;
+  } catch (e) {}
+  try {
+    return payments.p2wsh({ output, network }).address as string;
+  } catch (e) {}
+
+  throw new Error(bscript.toASM(output) + ' has no matching Address');
+}
+
+export function toOutputScript(address: string, network: Network): Buffer {
+  network = network || networks.bitcoin;
+
+  let decodeBase58: Base58CheckResult | undefined;
+  let decodeBech32: Bech32Result | undefined;
+  try {
+    decodeBase58 = fromBase58Check(address);
+  } catch (e) {}
+
+  if (decodeBase58) {
+    if (decodeBase58.version === network.pubKeyHash)
+      return payments.p2pkh({ hash: decodeBase58.hash }).output as Buffer;
+    if (decodeBase58.version === network.scriptHash)
+      return payments.p2sh({ hash: decodeBase58.hash }).output as Buffer;
+  } else {
+    try {
+      decodeBech32 = fromBech32(address);
+    } catch (e) {}
+
+    if (decodeBech32) {
+      if (decodeBech32.prefix !== network.bech32)
+        throw new Error(address + ' has an invalid prefix');
+      if (decodeBech32.version === 0) {
+        if (decodeBech32.data.length === 20)
+          return payments.p2wpkh({ hash: decodeBech32.data }).output as Buffer;
+        if (decodeBech32.data.length === 32)
+          return payments.p2wsh({ hash: decodeBech32.data }).output as Buffer;
+      }
+    }
+  }
+
+  throw new Error(address + ' has no matching Script');
+}

ts_src/block.ts

@@ -0,0 +1,285 @@
+import { reverseBuffer } from './bufferutils';
+import * as bcrypto from './crypto';
+import { Transaction } from './transaction';
+import * as types from './types';
+
+const fastMerkleRoot = require('merkle-lib/fastRoot');
+const typeforce = require('typeforce');
+const varuint = require('varuint-bitcoin');
+
+const errorMerkleNoTxes = new TypeError(
+  'Cannot compute merkle root for zero transactions',
+);
+const errorWitnessNotSegwit = new TypeError(
+  'Cannot compute witness commit for non-segwit block',
+);
+
+export class Block {
+  static fromBuffer(buffer: Buffer): Block {
+    if (buffer.length < 80) throw new Error('Buffer too small (< 80 bytes)');
+
+    let offset: number = 0;
+    const readSlice = (n: number): Buffer => {
+      offset += n;
+      return buffer.slice(offset - n, offset);
+    };
+
+    const readUInt32 = (): number => {
+      const i = buffer.readUInt32LE(offset);
+      offset += 4;
+      return i;
+    };
+
+    const readInt32 = (): number => {
+      const i = buffer.readInt32LE(offset);
+      offset += 4;
+      return i;
+    };
+
+    const block = new Block();
+    block.version = readInt32();
+    block.prevHash = readSlice(32);
+    block.merkleRoot = readSlice(32);
+    block.timestamp = readUInt32();
+    block.bits = readUInt32();
+    block.nonce = readUInt32();
+
+    if (buffer.length === 80) return block;
+
+    const readVarInt = (): number => {
+      const vi = varuint.decode(buffer, offset);
+      offset += varuint.decode.bytes;
+      return vi;
+    };
+
+    const readTransaction = (): any => {
+      const tx = Transaction.fromBuffer(buffer.slice(offset), true);
+      offset += tx.byteLength();
+      return tx;
+    };
+
+    const nTransactions = readVarInt();
+    block.transactions = [];
+
+    for (let i = 0; i < nTransactions; ++i) {
+      const tx = readTransaction();
+      block.transactions.push(tx);
+    }
+
+    const witnessCommit = block.getWitnessCommit();
+    // This Block contains a witness commit
+    if (witnessCommit) block.witnessCommit = witnessCommit;
+
+    return block;
+  }
+
+  static fromHex(hex: string): Block {
+    return Block.fromBuffer(Buffer.from(hex, 'hex'));
+  }
+
+  static calculateTarget(bits: number): Buffer {
+    const exponent = ((bits & 0xff000000) >> 24) - 3;
+    const mantissa = bits & 0x007fffff;
+    const target = Buffer.alloc(32, 0);
+    target.writeUIntBE(mantissa, 29 - exponent, 3);
+    return target;
+  }
+
+  static calculateMerkleRoot(
+    transactions: Transaction[],
+    forWitness?: boolean,
+  ): Buffer {
+    typeforce([{ getHash: types.Function }], transactions);
+    if (transactions.length === 0) throw errorMerkleNoTxes;
+    if (forWitness && !txesHaveWitnessCommit(transactions))
+      throw errorWitnessNotSegwit;
+
+    const hashes = transactions.map(transaction =>
+      transaction.getHash(forWitness!),
+    );
+
+    const rootHash = fastMerkleRoot(hashes, bcrypto.hash256);
+
+    return forWitness
+      ? bcrypto.hash256(
+          Buffer.concat([rootHash, transactions[0].ins[0].witness[0]]),
+        )
+      : rootHash;
+  }
+
+  version: number = 1;
+  prevHash?: Buffer = undefined;
+  merkleRoot?: Buffer = undefined;
+  timestamp: number = 0;
+  witnessCommit?: Buffer = undefined;
+  bits: number = 0;
+  nonce: number = 0;
+  transactions?: Transaction[] = undefined;
+
+  getWitnessCommit(): Buffer | null {
+    if (!txesHaveWitnessCommit(this.transactions!)) return null;
+
+    // The merkle root for the witness data is in an OP_RETURN output.
+    // There is no rule for the index of the output, so use filter to find it.
+    // The root is prepended with 0xaa21a9ed so check for 0x6a24aa21a9ed
+    // If multiple commits are found, the output with highest index is assumed.
+    const witnessCommits = this.transactions![0].outs.filter(out =>
+      out.script.slice(0, 6).equals(Buffer.from('6a24aa21a9ed', 'hex')),
+    ).map(out => out.script.slice(6, 38));
+    if (witnessCommits.length === 0) return null;
+    // Use the commit with the highest output (should only be one though)
+    const result = witnessCommits[witnessCommits.length - 1];
+
+    if (!(result instanceof Buffer && result.length === 32)) return null;
+    return result;
+  }
+
+  hasWitnessCommit(): boolean {
+    if (
+      this.witnessCommit instanceof Buffer &&
+      this.witnessCommit.length === 32
+    )
+      return true;
+    if (this.getWitnessCommit() !== null) return true;
+    return false;
+  }
+
+  hasWitness(): boolean {
+    return anyTxHasWitness(this.transactions!);
+  }
+
+  byteLength(headersOnly: boolean): number {
+    if (headersOnly || !this.transactions) return 80;
+
+    return (
+      80 +
+      varuint.encodingLength(this.transactions.length) +
+      this.transactions.reduce((a, x) => a + x.byteLength(), 0)
+    );
+  }
+
+  getHash(): Buffer {
+    return bcrypto.hash256(this.toBuffer(true));
+  }
+
+  getId(): string {
+    return reverseBuffer(this.getHash()).toString('hex');
+  }
+
+  getUTCDate(): Date {
+    const date = new Date(0); // epoch
+    date.setUTCSeconds(this.timestamp);
+
+    return date;
+  }
+
+  // TODO: buffer, offset compatibility
+  toBuffer(headersOnly: boolean): Buffer {
+    const buffer: Buffer = Buffer.allocUnsafe(this.byteLength(headersOnly));
+
+    let offset: number = 0;
+    const writeSlice = (slice: Buffer): void => {
+      slice.copy(buffer, offset);
+      offset += slice.length;
+    };
+
+    const writeInt32 = (i: number): void => {
+      buffer.writeInt32LE(i, offset);
+      offset += 4;
+    };
+    const writeUInt32 = (i: number): void => {
+      buffer.writeUInt32LE(i, offset);
+      offset += 4;
+    };
+
+    writeInt32(this.version);
+    writeSlice(this.prevHash!);
+    writeSlice(this.merkleRoot!);
+    writeUInt32(this.timestamp);
+    writeUInt32(this.bits);
+    writeUInt32(this.nonce);
+
+    if (headersOnly || !this.transactions) return buffer;
+
+    varuint.encode(this.transactions.length, buffer, offset);
+    offset += varuint.encode.bytes;
+
+    this.transactions.forEach(tx => {
+      const txSize = tx.byteLength(); // TODO: extract from toBuffer?
+      tx.toBuffer(buffer, offset);
+      offset += txSize;
+    });
+
+    return buffer;
+  }
+
+  toHex(headersOnly: boolean): string {
+    return this.toBuffer(headersOnly).toString('hex');
+  }
+
+  checkTxRoots(): boolean {
+    // If the Block has segwit transactions but no witness commit,
+    // there's no way it can be valid, so fail the check.
+    const hasWitnessCommit = this.hasWitnessCommit();
+    if (!hasWitnessCommit && this.hasWitness()) return false;
+    return (
+      this.__checkMerkleRoot() &&
+      (hasWitnessCommit ? this.__checkWitnessCommit() : true)
+    );
+  }
+
+  checkProofOfWork(): boolean {
+    const hash: Buffer = reverseBuffer(this.getHash());
+    const target = Block.calculateTarget(this.bits);
+
+    return hash.compare(target) <= 0;
+  }
+
+  private __checkMerkleRoot(): boolean {
+    if (!this.transactions) throw errorMerkleNoTxes;
+
+    const actualMerkleRoot = Block.calculateMerkleRoot(this.transactions);
+    return this.merkleRoot!.compare(actualMerkleRoot) === 0;
+  }
+
+  private __checkWitnessCommit(): boolean {
+    if (!this.transactions) throw errorMerkleNoTxes;
+    if (!this.hasWitnessCommit()) throw errorWitnessNotSegwit;
+
+    const actualWitnessCommit = Block.calculateMerkleRoot(
+      this.transactions,
+      true,
+    );
+    return this.witnessCommit!.compare(actualWitnessCommit) === 0;
+  }
+}
+
+function txesHaveWitnessCommit(transactions: Transaction[]): boolean {
+  return (
+    transactions instanceof Array &&
+    transactions[0] &&
+    transactions[0].ins &&
+    transactions[0].ins instanceof Array &&
+    transactions[0].ins[0] &&
+    transactions[0].ins[0].witness &&
+    transactions[0].ins[0].witness instanceof Array &&
+    transactions[0].ins[0].witness.length > 0
+  );
+}
+
+function anyTxHasWitness(transactions: Transaction[]): boolean {
+  return (
+    transactions instanceof Array &&
+    transactions.some(
+      tx =>
+        typeof tx === 'object' &&
+        tx.ins instanceof Array &&
+        tx.ins.some(
+          input =>
+            typeof input === 'object' &&
+            input.witness instanceof Array &&
+            input.witness.length > 0,
+        ),
+    )
+  );
+}

ts_src/bufferutils.ts

@@ -0,0 +1,44 @@
+// https://github.com/feross/buffer/blob/master/index.js#L1127
+function verifuint(value: number, max: number): void {
+  if (typeof value !== 'number')
+    throw new Error('cannot write a non-number as a number');
+  if (value < 0)
+    throw new Error('specified a negative value for writing an unsigned value');
+  if (value > max) throw new Error('RangeError: value out of range');
+  if (Math.floor(value) !== value)
+    throw new Error('value has a fractional component');
+}
+
+export function readUInt64LE(buffer: Buffer, offset: number): number {
+  const a = buffer.readUInt32LE(offset);
+  let b = buffer.readUInt32LE(offset + 4);
+  b *= 0x100000000;
+
+  verifuint(b + a, 0x001fffffffffffff);
+  return b + a;
+}
+
+export function writeUInt64LE(
+  buffer: Buffer,
+  value: number,
+  offset: number,
+): number {
+  verifuint(value, 0x001fffffffffffff);
+
+  buffer.writeInt32LE(value & -1, offset);
+  buffer.writeUInt32LE(Math.floor(value / 0x100000000), offset + 4);
+  return offset + 8;
+}
+
+export function reverseBuffer(buffer: Buffer): Buffer {
+  if (buffer.length < 1) return buffer;
+  let j = buffer.length - 1;
+  let tmp = 0;
+  for (let i = 0; i < buffer.length / 2; i++) {
+    tmp = buffer[i];
+    buffer[i] = buffer[j];
+    buffer[j] = tmp;
+    j--;
+  }
+  return buffer;
+}

ts_src/classify.ts

@@ -0,0 +1,71 @@
+import { decompile } from './script';
+import * as multisig from './templates/multisig';
+import * as nullData from './templates/nulldata';
+import * as pubKey from './templates/pubkey';
+import * as pubKeyHash from './templates/pubkeyhash';
+import * as scriptHash from './templates/scripthash';
+import * as witnessCommitment from './templates/witnesscommitment';
+import * as witnessPubKeyHash from './templates/witnesspubkeyhash';
+import * as witnessScriptHash from './templates/witnessscripthash';
+
+const types = {
+  P2MS: 'multisig' as string,
+  NONSTANDARD: 'nonstandard' as string,
+  NULLDATA: 'nulldata' as string,
+  P2PK: 'pubkey' as string,
+  P2PKH: 'pubkeyhash' as string,
+  P2SH: 'scripthash' as string,
+  P2WPKH: 'witnesspubkeyhash' as string,
+  P2WSH: 'witnessscripthash' as string,
+  WITNESS_COMMITMENT: 'witnesscommitment' as string,
+};
+
+function classifyOutput(script: Buffer): string {
+  if (witnessPubKeyHash.output.check(script)) return types.P2WPKH;
+  if (witnessScriptHash.output.check(script)) return types.P2WSH;
+  if (pubKeyHash.output.check(script)) return types.P2PKH;
+  if (scriptHash.output.check(script)) return types.P2SH;
+
+  // XXX: optimization, below functions .decompile before use
+  const chunks = decompile(script);
+  if (!chunks) throw new TypeError('Invalid script');
+
+  if (multisig.output.check(chunks)) return types.P2MS;
+  if (pubKey.output.check(chunks)) return types.P2PK;
+  if (witnessCommitment.output.check(chunks)) return types.WITNESS_COMMITMENT;
+  if (nullData.output.check(chunks)) return types.NULLDATA;
+
+  return types.NONSTANDARD;
+}
+
+function classifyInput(script: Buffer, allowIncomplete: boolean): string {
+  // XXX: optimization, below functions .decompile before use
+  const chunks = decompile(script);
+  if (!chunks) throw new TypeError('Invalid script');
+
+  if (pubKeyHash.input.check(chunks)) return types.P2PKH;
+  if (scriptHash.input.check(chunks, allowIncomplete)) return types.P2SH;
+  if (multisig.input.check(chunks, allowIncomplete)) return types.P2MS;
+  if (pubKey.input.check(chunks)) return types.P2PK;
+
+  return types.NONSTANDARD;
+}
+
+function classifyWitness(script: Buffer[], allowIncomplete: boolean): string {
+  // XXX: optimization, below functions .decompile before use
+  const chunks = decompile(script);
+  if (!chunks) throw new TypeError('Invalid script');
+
+  if (witnessPubKeyHash.input.check(chunks)) return types.P2WPKH;
+  if (witnessScriptHash.input.check(chunks as Buffer[], allowIncomplete))
+    return types.P2WSH;
+
+  return types.NONSTANDARD;
+}
+
+export {
+  classifyInput as input,
+  classifyOutput as output,
+  classifyWitness as witness,
+  types,
+};

ts_src/crypto.ts

@@ -0,0 +1,33 @@
+const createHash = require('create-hash');
+
+export function ripemd160(buffer: Buffer): Buffer {
+  try {
+    return createHash('rmd160')
+      .update(buffer)
+      .digest();
+  } catch (err) {
+    return createHash('ripemd160')
+      .update(buffer)
+      .digest();
+  }
+}
+
+export function sha1(buffer: Buffer): Buffer {
+  return createHash('sha1')
+    .update(buffer)
+    .digest();
+}
+
+export function sha256(buffer: Buffer): Buffer {
+  return createHash('sha256')
+    .update(buffer)
+    .digest();
+}
+
+export function hash160(buffer: Buffer): Buffer {
+  return ripemd160(sha256(buffer));
+}
+
+export function hash256(buffer: Buffer): Buffer {
+  return sha256(sha256(buffer));
+}

ts_src/ecpair.ts

@@ -0,0 +1,131 @@
+import { Network } from './networks';
+import * as NETWORKS from './networks';
+import * as types from './types';
+const ecc = require('tiny-secp256k1');
+const randomBytes = require('randombytes');
+const typeforce = require('typeforce');
+const wif = require('wif');
+
+const isOptions = typeforce.maybe(
+  typeforce.compile({
+    compressed: types.maybe(types.Boolean),
+    network: types.maybe(types.Network),
+  }),
+);
+
+interface ECPairOptions {
+  compressed?: boolean;
+  network?: Network;
+  rng?(arg0: Buffer): Buffer;
+}
+
+export interface ECPairInterface {
+  compressed: boolean;
+  network: Network;
+  privateKey?: Buffer;
+  publicKey?: Buffer;
+  toWIF(): string;
+  sign(hash: Buffer): Buffer;
+  verify(hash: Buffer, signature: Buffer): Buffer;
+  getPublicKey?(): Buffer;
+}
+
+class ECPair implements ECPairInterface {
+  compressed: boolean;
+  network: Network;
+
+  constructor(
+    private __D?: Buffer,
+    private __Q?: Buffer,
+    options?: ECPairOptions,
+  ) {
+    if (options === undefined) options = {};
+    this.compressed =
+      options.compressed === undefined ? true : options.compressed;
+    this.network = options.network || NETWORKS.bitcoin;
+
+    if (__Q !== undefined) this.__Q = ecc.pointCompress(__Q, this.compressed);
+  }
+
+  get privateKey(): Buffer | undefined {
+    return this.__D;
+  }
+
+  get publicKey(): Buffer | undefined {
+    if (!this.__Q) this.__Q = ecc.pointFromScalar(this.__D, this.compressed);
+    return this.__Q;
+  }
+
+  toWIF(): string {
+    if (!this.__D) throw new Error('Missing private key');
+    return wif.encode(this.network.wif, this.__D, this.compressed);
+  }
+
+  sign(hash: Buffer): Buffer {
+    if (!this.__D) throw new Error('Missing private key');
+    return ecc.sign(hash, this.__D);
+  }
+
+  verify(hash: Buffer, signature: Buffer): Buffer {
+    return ecc.verify(hash, this.publicKey, signature);
+  }
+}
+
+function fromPrivateKey(buffer: Buffer, options?: ECPairOptions): ECPair {
+  typeforce(types.Buffer256bit, buffer);
+  if (!ecc.isPrivate(buffer))
+    throw new TypeError('Private key not in range [1, n)');
+  typeforce(isOptions, options);
+
+  return new ECPair(buffer, undefined, options as ECPairOptions);
+}
+
+function fromPublicKey(buffer: Buffer, options?: ECPairOptions): ECPair {
+  typeforce(ecc.isPoint, buffer);
+  typeforce(isOptions, options);
+  return new ECPair(undefined, buffer, options as ECPairOptions);
+}
+
+function fromWIF(wifString: string, network?: Network | Network[]): ECPair {
+  const decoded = wif.decode(wifString);
+  const version = decoded.version;
+
+  // list of networks?
+  if (types.Array(network)) {
+    network = (network as Network[])
+      .filter((x: Network) => {
+        return version === x.wif;
+      })
+      .pop() as Network;
+
+    if (!network) throw new Error('Unknown network version');
+
+    // otherwise, assume a network object (or default to bitcoin)
+  } else {
+    network = network || NETWORKS.bitcoin;
+
+    if (version !== (network as Network).wif)
+      throw new Error('Invalid network version');
+  }
+
+  return fromPrivateKey(decoded.privateKey, {
+    compressed: decoded.compressed,
+    network: network as Network,
+  });
+}
+
+function makeRandom(options?: ECPairOptions): ECPair {
+  typeforce(isOptions, options);
+  if (options === undefined) options = {};
+  const rng = options.rng || randomBytes;
+
+  let d;
+  do {
+    d = rng(32);
+    typeforce(types.Buffer256bit, d);
+  } while (!ecc.isPrivate(d));
+
+  return fromPrivateKey(d, options);
+}
+
+export { makeRandom, fromPrivateKey, fromPublicKey, fromWIF };

ts_src/index.ts

@@ -0,0 +1,20 @@
+import * as bip32 from 'bip32';
+import * as address from './address';
+import * as crypto from './crypto';
+import * as ECPair from './ecpair';
+import * as networks from './networks';
+import * as payments from './payments';
+import * as script from './script';
+
+export { ECPair, address, bip32, crypto, networks, payments, script };
+
+export { Block } from './block';
+export { OPS as opcodes } from './script';
+export { Transaction } from './transaction';
+export { TransactionBuilder } from './transaction_builder';
+
+export { BIP32Interface } from 'bip32';
+export { Network } from './networks';
+export { Payment, PaymentOpts } from './payments';
+export { OpCode } from './script';
+export { Input as TxInput, Output as TxOutput } from './transaction';

ts_src/networks.ts

@@ -0,0 +1,49 @@
+// https://en.bitcoin.it/wiki/List_of_address_prefixes
+// Dogecoin BIP32 is a proposed standard: https://bitcointalk.org/index.php?topic=409731
+export interface Network {
+  messagePrefix: string;
+  bech32: string;
+  bip32: Bip32;
+  pubKeyHash: number;
+  scriptHash: number;
+  wif: number;
+}
+
+interface Bip32 {
+  public: number;
+  private: number;
+}
+
+export const bitcoin: Network = {
+  messagePrefix: '\x18Bitcoin Signed Message:\n',
+  bech32: 'bc',
+  bip32: {
+    public: 0x0488b21e,
+    private: 0x0488ade4,
+  },
+  pubKeyHash: 0x00,
+  scriptHash: 0x05,
+  wif: 0x80,
+};
+export const regtest: Network = {
+  messagePrefix: '\x18Bitcoin Signed Message:\n',
+  bech32: 'bcrt',
+  bip32: {
+    public: 0x043587cf,
+    private: 0x04358394,
+  },
+  pubKeyHash: 0x6f,
+  scriptHash: 0xc4,
+  wif: 0xef,
+};
+export const testnet: Network = {
+  messagePrefix: '\x18Bitcoin Signed Message:\n',
+  bech32: 'tb',
+  bip32: {
+    public: 0x043587cf,
+    private: 0x04358394,
+  },
+  pubKeyHash: 0x6f,
+  scriptHash: 0xc4,
+  wif: 0xef,
+};

ts_src/payments/embed.ts

@@ -0,0 +1,58 @@
+import { bitcoin as BITCOIN_NETWORK } from '../networks';
+import * as bscript from '../script';
+import { Payment, PaymentOpts, Stack } from './index';
+import * as lazy from './lazy';
+
+const typef = require('typeforce');
+const OPS = bscript.OPS;
+
+function stacksEqual(a: Buffer[], b: Buffer[]): boolean {
+  if (a.length !== b.length) return false;
+
+  return a.every((x, i) => {
+    return x.equals(b[i]);
+  });
+}
+
+// output: OP_RETURN ...
+export function p2data(a: Payment, opts?: PaymentOpts): Payment {
+  if (!a.data && !a.output) throw new TypeError('Not enough data');
+  opts = Object.assign({ validate: true }, opts || {});
+
+  typef(
+    {
+      network: typef.maybe(typef.Object),
+      output: typef.maybe(typef.Buffer),
+      data: typef.maybe(typef.arrayOf(typef.Buffer)),
+    },
+    a,
+  );
+
+  const network = a.network || BITCOIN_NETWORK;
+  const o = { network } as Payment;
+
+  lazy.prop(o, 'output', () => {
+    if (!a.data) return;
+    return bscript.compile(([OPS.OP_RETURN] as Stack).concat(a.data));
+  });
+  lazy.prop(o, 'data', () => {
+    if (!a.output) return;
+    return bscript.decompile(a.output)!.slice(1);
+  });
+
+  // extended validation
+  if (opts.validate) {
+    if (a.output) {
+      const chunks = bscript.decompile(a.output);
+      if (chunks![0] !== OPS.OP_RETURN)
+        throw new TypeError('Output is invalid');
+      if (!chunks!.slice(1).every(typef.Buffer))
+        throw new TypeError('Output is invalid');
+
+      if (a.data && !stacksEqual(a.data, o.data as Buffer[]))
+        throw new TypeError('Data mismatch');
+    }
+  }
+
+  return Object.assign(o, a);
+}

ts_src/payments/index.ts

@@ -0,0 +1,41 @@
+import { Network } from '../networks';
+import { p2data as embed } from './embed';
+import { p2ms } from './p2ms';
+import { p2pk } from './p2pk';
+import { p2pkh } from './p2pkh';
+import { p2sh } from './p2sh';
+import { p2wpkh } from './p2wpkh';
+import { p2wsh } from './p2wsh';
+
+export interface Payment {
+  network?: Network;
+  output?: Buffer;
+  data?: Buffer[];
+  m?: number;
+  n?: number;
+  pubkeys?: Buffer[];
+  input?: Buffer;
+  signatures?: Buffer[];
+  pubkey?: Buffer;
+  signature?: Buffer;
+  address?: string;
+  hash?: Buffer;
+  redeem?: Payment;
+  witness?: Buffer[];
+}
+
+export type PaymentFunction = () => Payment;
+
+export interface PaymentOpts {
+  validate?: boolean;
+  allowIncomplete?: boolean;
+}
+
+export type StackElement = Buffer | number;
+export type Stack = StackElement[];
+export type StackFunction = () => Stack;
+
+export { embed, p2ms, p2pk, p2pkh, p2sh, p2wpkh, p2wsh };
+
+// TODO
+// witness commitment

ts_src/payments/lazy.ts

@@ -0,0 +1,28 @@
+export function prop(object: {}, name: string, f: () => any): void {
+  Object.defineProperty(object, name, {
+    configurable: true,
+    enumerable: true,
+    get(): any {
+      const _value = f.call(this);
+      this[name] = _value;
+      return _value;
+    },
+    set(_value: any): void {
+      Object.defineProperty(this, name, {
+        configurable: true,
+        enumerable: true,
+        value: _value,
+        writable: true,
+      });
+    },
+  });
+}
+
+export function value<T>(f: () => T): () => T {
+  let _value: T;
+  return (): T => {
+    if (_value !== undefined) return _value;
+    _value = f();
+    return _value;
+  };
+}

ts_src/payments/p2ms.ts

@@ -0,0 +1,158 @@
+import { bitcoin as BITCOIN_NETWORK } from '../networks';
+import * as bscript from '../script';
+import { Payment, PaymentOpts, Stack } from './index';
+import * as lazy from './lazy';
+const OPS = bscript.OPS;
+const typef = require('typeforce');
+const ecc = require('tiny-secp256k1');
+
+const OP_INT_BASE = OPS.OP_RESERVED; // OP_1 - 1
+
+function stacksEqual(a: Buffer[], b: Buffer[]): boolean {
+  if (a.length !== b.length) return false;
+
+  return a.every((x, i) => {
+    return x.equals(b[i]);
+  });
+}
+
+// input: OP_0 [signatures ...]
+// output: m [pubKeys ...] n OP_CHECKMULTISIG
+export function p2ms(a: Payment, opts?: PaymentOpts): Payment {
+  if (
+    !a.input &&
+    !a.output &&
+    !(a.pubkeys && a.m !== undefined) &&
+    !a.signatures
+  )
+    throw new TypeError('Not enough data');
+  opts = Object.assign({ validate: true }, opts || {});
+
+  function isAcceptableSignature(x: Buffer | number): boolean {
+    return (
+      bscript.isCanonicalScriptSignature(x as Buffer) ||
+      (opts!.allowIncomplete && (x as number) === OPS.OP_0) !== undefined
+    );
+  }
+
+  typef(
+    {
+      network: typef.maybe(typef.Object),
+      m: typef.maybe(typef.Number),
+      n: typef.maybe(typef.Number),
+      output: typef.maybe(typef.Buffer),
+      pubkeys: typef.maybe(typef.arrayOf(ecc.isPoint)),
+
+      signatures: typef.maybe(typef.arrayOf(isAcceptableSignature)),
+      input: typef.maybe(typef.Buffer),
+    },
+    a,
+  );
+
+  const network = a.network || BITCOIN_NETWORK;
+  const o: Payment = { network };
+
+  let chunks: Stack = [];
+  let decoded = false;
+  function decode(output: Buffer | Stack): void {
+    if (decoded) return;
+    decoded = true;
+    chunks = bscript.decompile(output) as Stack;
+    o.m = (chunks[0] as number) - OP_INT_BASE;
+    o.n = (chunks[chunks.length - 2] as number) - OP_INT_BASE;
+    o.pubkeys = chunks.slice(1, -2) as Buffer[];
+  }
+
+  lazy.prop(o, 'output', () => {
+    if (!a.m) return;
+    if (!o.n) return;
+    if (!a.pubkeys) return;
+    return bscript.compile(
+      ([] as Stack).concat(
+        OP_INT_BASE + a.m,
+        a.pubkeys,
+        OP_INT_BASE + o.n,
+        OPS.OP_CHECKMULTISIG,
+      ),
+    );
+  });
+  lazy.prop(o, 'm', () => {
+    if (!o.output) return;
+    decode(o.output);
+    return o.m;
+  });
+  lazy.prop(o, 'n', () => {
+    if (!o.pubkeys) return;
+    return o.pubkeys.length;
+  });
+  lazy.prop(o, 'pubkeys', () => {
+    if (!a.output) return;
+    decode(a.output);
+    return o.pubkeys;
+  });
+  lazy.prop(o, 'signatures', () => {
+    if (!a.input) return;
+    return bscript.decompile(a.input)!.slice(1);
+  });
+  lazy.prop(o, 'input', () => {
+    if (!a.signatures) return;
+    return bscript.compile(([OPS.OP_0] as Stack).concat(a.signatures));
+  });
+  lazy.prop(o, 'witness', () => {
+    if (!o.input) return;
+    return [];
+  });
+
+  // extended validation
+  if (opts.validate) {
+    if (a.output) {
+      decode(a.output);
+      if (!typef.Number(chunks[0])) throw new TypeError('Output is invalid');
+      if (!typef.Number(chunks[chunks.length - 2]))
+        throw new TypeError('Output is invalid');
+      if (chunks[chunks.length - 1] !== OPS.OP_CHECKMULTISIG)
+        throw new TypeError('Output is invalid');
+
+      if (o.m! <= 0 || o.n! > 16 || o.m! > o.n! || o.n !== chunks.length - 3)
+        throw new TypeError('Output is invalid');
+      if (!o.pubkeys!.every(x => ecc.isPoint(x)))
+        throw new TypeError('Output is invalid');
+
+      if (a.m !== undefined && a.m !== o.m) throw new TypeError('m mismatch');
+      if (a.n !== undefined && a.n !== o.n) throw new TypeError('n mismatch');
+      if (a.pubkeys && !stacksEqual(a.pubkeys, o.pubkeys!))
+        throw new TypeError('Pubkeys mismatch');
+    }
+
+    if (a.pubkeys) {
+      if (a.n !== undefined && a.n !== a.pubkeys.length)
+        throw new TypeError('Pubkey count mismatch');
+      o.n = a.pubkeys.length;
+
+      if (o.n < o.m!) throw new TypeError('Pubkey count cannot be less than m');
+    }
+
+    if (a.signatures) {
+      if (a.signatures.length < o.m!)
+        throw new TypeError('Not enough signatures provided');
+      if (a.signatures.length > o.m!)
+        throw new TypeError('Too many signatures provided');
+    }
+
+    if (a.input) {
+      if (a.input[0] !== OPS.OP_0) throw new TypeError('Input is invalid');
+      if (
+        o.signatures!.length === 0 ||
+        !o.signatures!.every(isAcceptableSignature)
+      )
+        throw new TypeError('Input has invalid signature(s)');
+
+      if (a.signatures && !stacksEqual(a.signatures, o.signatures!))
+        throw new TypeError('Signature mismatch');
+      if (a.m !== undefined && a.m !== a.signatures!.length)
+        throw new TypeError('Signature count mismatch');
+    }
+  }
+
+  return Object.assign(o, a);
+}

ts_src/payments/p2pk.ts

@@ -0,0 +1,80 @@
+import { bitcoin as BITCOIN_NETWORK } from '../networks';
+import * as bscript from '../script';
+import { Payment, PaymentOpts, StackFunction } from './index';
+import * as lazy from './lazy';
+const typef = require('typeforce');
+const OPS = bscript.OPS;
+const ecc = require('tiny-secp256k1');
+
+// input: {signature}
+// output: {pubKey} OP_CHECKSIG
+export function p2pk(a: Payment, opts?: PaymentOpts): Payment {
+  if (!a.input && !a.output && !a.pubkey && !a.input && !a.signature)
+    throw new TypeError('Not enough data');
+  opts = Object.assign({ validate: true }, opts || {});
+
+  typef(
+    {
+      network: typef.maybe(typef.Object),
+      output: typef.maybe(typef.Buffer),
+      pubkey: typef.maybe(ecc.isPoint),
+
+      signature: typef.maybe(bscript.isCanonicalScriptSignature),
+      input: typef.maybe(typef.Buffer),
+    },
+    a,
+  );
+
+  const _chunks = lazy.value(() => {
+    return bscript.decompile(a.input!);
+  }) as StackFunction;
+
+  const network = a.network || BITCOIN_NETWORK;
+  const o: Payment = { network };
+
+  lazy.prop(o, 'output', () => {
+    if (!a.pubkey) return;
+    return bscript.compile([a.pubkey, OPS.OP_CHECKSIG]);
+  });
+  lazy.prop(o, 'pubkey', () => {
+    if (!a.output) return;
+    return a.output.slice(1, -1);
+  });
+  lazy.prop(o, 'signature', () => {
+    if (!a.input) return;
+    return _chunks()[0] as Buffer;
+  });
+  lazy.prop(o, 'input', () => {
+    if (!a.signature) return;
+    return bscript.compile([a.signature]);
+  });
+  lazy.prop(o, 'witness', () => {
+    if (!o.input) return;
+    return [];
+  });
+
+  // extended validation
+  if (opts.validate) {
+    if (a.output) {
+      if (a.output[a.output.length - 1] !== OPS.OP_CHECKSIG)
+        throw new TypeError('Output is invalid');
+      if (!ecc.isPoint(o.pubkey))
+        throw new TypeError('Output pubkey is invalid');
+      if (a.pubkey && !a.pubkey.equals(o.pubkey!))
+        throw new TypeError('Pubkey mismatch');
+    }
+
+    if (a.signature) {
+      if (a.input && !a.input.equals(o.input!))
+        throw new TypeError('Signature mismatch');
+    }
+
+    if (a.input) {
+      if (_chunks().length !== 1) throw new TypeError('Input is invalid');
+      if (!bscript.isCanonicalScriptSignature(o.signature!))
+        throw new TypeError('Input has invalid signature');
+    }
+  }
+
+  return Object.assign(o, a);
+}

ts_src/payments/p2pkh.ts

@@ -0,0 +1,147 @@
+import * as bcrypto from '../crypto';
+import { bitcoin as BITCOIN_NETWORK } from '../networks';
+import * as bscript from '../script';
+import { Payment, PaymentOpts, StackFunction } from './index';
+import * as lazy from './lazy';
+const typef = require('typeforce');
+const OPS = bscript.OPS;
+const ecc = require('tiny-secp256k1');
+
+const bs58check = require('bs58check');
+
+// input: {signature} {pubkey}
+// output: OP_DUP OP_HASH160 {hash160(pubkey)} OP_EQUALVERIFY OP_CHECKSIG
+export function p2pkh(a: Payment, opts?: PaymentOpts): Payment {
+  if (!a.address && !a.hash && !a.output && !a.pubkey && !a.input)
+    throw new TypeError('Not enough data');
+  opts = Object.assign({ validate: true }, opts || {});
+
+  typef(
+    {
+      network: typef.maybe(typef.Object),
+      address: typef.maybe(typef.String),
+      hash: typef.maybe(typef.BufferN(20)),
+      output: typef.maybe(typef.BufferN(25)),
+
+      pubkey: typef.maybe(ecc.isPoint),
+      signature: typef.maybe(bscript.isCanonicalScriptSignature),
+      input: typef.maybe(typef.Buffer),
+    },
+    a,
+  );
+
+  const _address = lazy.value(() => {
+    const payload = bs58check.decode(a.address);
+    const version = payload.readUInt8(0);
+    const hash = payload.slice(1);
+    return { version, hash };
+  });
+  const _chunks = lazy.value(() => {
+    return bscript.decompile(a.input!);
+  }) as StackFunction;
+
+  const network = a.network || BITCOIN_NETWORK;
+  const o: Payment = { network };
+
+  lazy.prop(o, 'address', () => {
+    if (!o.hash) return;
+
+    const payload = Buffer.allocUnsafe(21);
+    payload.writeUInt8(network.pubKeyHash, 0);
+    o.hash.copy(payload, 1);
+    return bs58check.encode(payload);
+  });
+  lazy.prop(o, 'hash', () => {
+    if (a.output) return a.output.slice(3, 23);
+    if (a.address) return _address().hash;
+    if (a.pubkey || o.pubkey) return bcrypto.hash160(a.pubkey! || o.pubkey!);
+  });
+  lazy.prop(o, 'output', () => {
+    if (!o.hash) return;
+    return bscript.compile([
+      OPS.OP_DUP,
+      OPS.OP_HASH160,
+      o.hash,
+      OPS.OP_EQUALVERIFY,
+      OPS.OP_CHECKSIG,
+    ]);
+  });
+  lazy.prop(o, 'pubkey', () => {
+    if (!a.input) return;
+    return _chunks()[1] as Buffer;
+  });
+  lazy.prop(o, 'signature', () => {
+    if (!a.input) return;
+    return _chunks()[0] as Buffer;
+  });
+  lazy.prop(o, 'input', () => {
+    if (!a.pubkey) return;
+    if (!a.signature) return;
+    return bscript.compile([a.signature, a.pubkey]);
+  });
+  lazy.prop(o, 'witness', () => {
+    if (!o.input) return;
+    return [];
+  });
+
+  // extended validation
+  if (opts.validate) {
+    let hash: Buffer = Buffer.from([]);
+    if (a.address) {
+      if (_address().version !== network.pubKeyHash)
+        throw new TypeError('Invalid version or Network mismatch');
+      if (_address().hash.length !== 20) throw new TypeError('Invalid address');
+      hash = _address().hash;
+    }
+
+    if (a.hash) {
+      if (hash.length > 0 && !hash.equals(a.hash))
+        throw new TypeError('Hash mismatch');
+      else hash = a.hash;
+    }
+
+    if (a.output) {
+      if (
+        a.output.length !== 25 ||
+        a.output[0] !== OPS.OP_DUP ||
+        a.output[1] !== OPS.OP_HASH160 ||
+        a.output[2] !== 0x14 ||
+        a.output[23] !== OPS.OP_EQUALVERIFY ||
+        a.output[24] !== OPS.OP_CHECKSIG
+      )
+        throw new TypeError('Output is invalid');
+
+      const hash2 = a.output.slice(3, 23);
+      if (hash.length > 0 && !hash.equals(hash2))
+        throw new TypeError('Hash mismatch');
+      else hash = hash2;
+    }
+
+    if (a.pubkey) {
+      const pkh = bcrypto.hash160(a.pubkey);
+      if (hash.length > 0 && !hash.equals(pkh))
+        throw new TypeError('Hash mismatch');
+      else hash = pkh;
+    }
+
+    if (a.input) {
+      const chunks = _chunks();
+      if (chunks.length !== 2) throw new TypeError('Input is invalid');
+      if (!bscript.isCanonicalScriptSignature(chunks[0] as Buffer))
+        throw new TypeError('Input has invalid signature');
+      if (!ecc.isPoint(chunks[1]))
+        throw new TypeError('Input has invalid pubkey');
+
+      if (a.signature && !a.signature.equals(chunks[0] as Buffer))
+        throw new TypeError('Signature mismatch');
+      if (a.pubkey && !a.pubkey.equals(chunks[1] as Buffer))
+        throw new TypeError('Pubkey mismatch');
+
+      const pkh = bcrypto.hash160(chunks[1] as Buffer);
+      if (hash.length > 0 && !hash.equals(pkh))
+        throw new TypeError('Hash mismatch');
+    }
+  }
+
+  return Object.assign(o, a);
+}

ts_src/payments/p2sh.ts

@@ -0,0 +1,213 @@
+import * as bcrypto from '../crypto';
+import { bitcoin as BITCOIN_NETWORK } from '../networks';
+import * as bscript from '../script';
+import {
+  Payment,
+  PaymentFunction,
+  PaymentOpts,
+  Stack,
+  StackFunction,
+} from './index';
+import * as lazy from './lazy';
+const typef = require('typeforce');
+const OPS = bscript.OPS;
+
+const bs58check = require('bs58check');
+
+function stacksEqual(a: Buffer[], b: Buffer[]): boolean {
+  if (a.length !== b.length) return false;
+
+  return a.every((x, i) => {
+    return x.equals(b[i]);
+  });
+}
+
+// input: [redeemScriptSig ...] {redeemScript}
+// witness: <?>
+// output: OP_HASH160 {hash160(redeemScript)} OP_EQUAL
+export function p2sh(a: Payment, opts?: PaymentOpts): Payment {
+  if (!a.address && !a.hash && !a.output && !a.redeem && !a.input)
+    throw new TypeError('Not enough data');
+  opts = Object.assign({ validate: true }, opts || {});
+
+  typef(
+    {
+      network: typef.maybe(typef.Object),
+
+      address: typef.maybe(typef.String),
+      hash: typef.maybe(typef.BufferN(20)),
+      output: typef.maybe(typef.BufferN(23)),
+
+      redeem: typef.maybe({
+        network: typef.maybe(typef.Object),
+        output: typef.maybe(typef.Buffer),
+        input: typef.maybe(typef.Buffer),
+        witness: typef.maybe(typef.arrayOf(typef.Buffer)),
+      }),
+      input: typef.maybe(typef.Buffer),
+      witness: typef.maybe(typef.arrayOf(typef.Buffer)),
+    },
+    a,
+  );
+
+  let network = a.network;
+  if (!network) {
+    network = (a.redeem && a.redeem.network) || BITCOIN_NETWORK;
+  }
+
+  const o: Payment = { network };
+
+  const _address = lazy.value(() => {
+    const payload = bs58check.decode(a.address);
+    const version = payload.readUInt8(0);
+    const hash = payload.slice(1);
+    return { version, hash };
+  });
+  const _chunks = lazy.value(() => {
+    return bscript.decompile(a.input!);
+  }) as StackFunction;
+  const _redeem = lazy.value(
+    (): Payment => {
+      const chunks = _chunks();
+      return {
+        network,
+        output: chunks[chunks.length - 1] as Buffer,
+        input: bscript.compile(chunks.slice(0, -1)),
+        witness: a.witness || [],
+      };
+    },
+  ) as PaymentFunction;
+
+  // output dependents
+  lazy.prop(o, 'address', () => {
+    if (!o.hash) return;
+
+    const payload = Buffer.allocUnsafe(21);
+    payload.writeUInt8(o.network!.scriptHash, 0);
+    o.hash.copy(payload, 1);
+    return bs58check.encode(payload);
+  });
+  lazy.prop(o, 'hash', () => {
+    // in order of least effort
+    if (a.output) return a.output.slice(2, 22);
+    if (a.address) return _address().hash;
+    if (o.redeem && o.redeem.output) return bcrypto.hash160(o.redeem.output);
+  });
+  lazy.prop(o, 'output', () => {
+    if (!o.hash) return;
+    return bscript.compile([OPS.OP_HASH160, o.hash, OPS.OP_EQUAL]);
+  });
+
+  // input dependents
+  lazy.prop(o, 'redeem', () => {
+    if (!a.input) return;
+    return _redeem();
+  });
+  lazy.prop(o, 'input', () => {
+    if (!a.redeem || !a.redeem.input || !a.redeem.output) return;
+    return bscript.compile(
+      ([] as Stack).concat(
+        bscript.decompile(a.redeem.input) as Stack,
+        a.redeem.output,
+      ),
+    );
+  });
+  lazy.prop(o, 'witness', () => {
+    if (o.redeem && o.redeem.witness) return o.redeem.witness;
+    if (o.input) return [];
+  });
+
+  if (opts.validate) {
+    let hash: Buffer = Buffer.from([]);
+    if (a.address) {
+      if (_address().version !== network.scriptHash)
+        throw new TypeError('Invalid version or Network mismatch');
+      if (_address().hash.length !== 20) throw new TypeError('Invalid address');
+      hash = _address().hash;
+    }
+
+    if (a.hash) {
+      if (hash.length > 0 && !hash.equals(a.hash))
+        throw new TypeError('Hash mismatch');
+      else hash = a.hash;
+    }
+
+    if (a.output) {
+      if (
+        a.output.length !== 23 ||
+        a.output[0] !== OPS.OP_HASH160 ||
+        a.output[1] !== 0x14 ||
+        a.output[22] !== OPS.OP_EQUAL
+      )
+        throw new TypeError('Output is invalid');
+
+      const hash2 = a.output.slice(2, 22);
+      if (hash.length > 0 && !hash.equals(hash2))
+        throw new TypeError('Hash mismatch');
+      else hash = hash2;
+    }
+
+    // inlined to prevent 'no-inner-declarations' failing
+    const checkRedeem = (redeem: Payment): void => {
+      // is the redeem output empty/invalid?
+      if (redeem.output) {
+        const decompile = bscript.decompile(redeem.output);
+        if (!decompile || decompile.length < 1)
+          throw new TypeError('Redeem.output too short');
+
+        // match hash against other sources
+        const hash2 = bcrypto.hash160(redeem.output);
+        if (hash.length > 0 && !hash.equals(hash2))
+          throw new TypeError('Hash mismatch');
+        else hash = hash2;
+      }
+
+      if (redeem.input) {
+        const hasInput = redeem.input.length > 0;
+        const hasWitness = redeem.witness && redeem.witness.length > 0;
+        if (!hasInput && !hasWitness) throw new TypeError('Empty input');
+        if (hasInput && hasWitness)
+          throw new TypeError('Input and witness provided');
+        if (hasInput) {
+          const richunks = bscript.decompile(redeem.input) as Stack;
+          if (!bscript.isPushOnly(richunks))
+            throw new TypeError('Non push-only scriptSig');
+        }
+      }
+    };
+
+    if (a.input) {
+      const chunks = _chunks();
+      if (!chunks || chunks.length < 1) throw new TypeError('Input too short');
+      if (!Buffer.isBuffer(_redeem().output))
+        throw new TypeError('Input is invalid');
+
+      checkRedeem(_redeem());
+    }
+
+    if (a.redeem) {
+      if (a.redeem.network && a.redeem.network !== network)
+        throw new TypeError('Network mismatch');
+      if (a.input) {
+        const redeem = _redeem();
+        if (a.redeem.output && !a.redeem.output.equals(redeem.output!))
+          throw new TypeError('Redeem.output mismatch');
+        if (a.redeem.input && !a.redeem.input.equals(redeem.input!))
+          throw new TypeError('Redeem.input mismatch');
+      }
+
+      checkRedeem(a.redeem);
+    }
+
+    if (a.witness) {
+      if (
+        a.redeem &&
+        a.redeem.witness &&
+        !stacksEqual(a.redeem.witness, a.witness)
+      )
+        throw new TypeError('Witness and redeem.witness mismatch');
+    }
+  }
+
+  return Object.assign(o, a);
+}

ts_src/payments/p2wpkh.ts

@@ -0,0 +1,142 @@
+import * as bcrypto from '../crypto';
+import { bitcoin as BITCOIN_NETWORK } from '../networks';
+import * as bscript from '../script';
+import { Payment, PaymentOpts } from './index';
+import * as lazy from './lazy';
+const typef = require('typeforce');
+const OPS = bscript.OPS;
+const ecc = require('tiny-secp256k1');
+
+const bech32 = require('bech32');
+
+const EMPTY_BUFFER = Buffer.alloc(0);
+
+// witness: {signature} {pubKey}
+// input: <>
+// output: OP_0 {pubKeyHash}
+export function p2wpkh(a: Payment, opts?: PaymentOpts): Payment {
+  if (!a.address && !a.hash && !a.output && !a.pubkey && !a.witness)
+    throw new TypeError('Not enough data');
+  opts = Object.assign({ validate: true }, opts || {});
+
+  typef(
+    {
+      address: typef.maybe(typef.String),
+      hash: typef.maybe(typef.BufferN(20)),
+      input: typef.maybe(typef.BufferN(0)),
+      network: typef.maybe(typef.Object),
+      output: typef.maybe(typef.BufferN(22)),
+      pubkey: typef.maybe(ecc.isPoint),
+      signature: typef.maybe(bscript.isCanonicalScriptSignature),
+      witness: typef.maybe(typef.arrayOf(typef.Buffer)),
+    },
+    a,
+  );
+
+  const _address = lazy.value(() => {
+    const result = bech32.decode(a.address);
+    const version = result.words.shift();
+    const data = bech32.fromWords(result.words);
+    return {
+      version,
+      prefix: result.prefix,
+      data: Buffer.from(data),
+    };
+  });
+
+  const network = a.network || BITCOIN_NETWORK;
+  const o: Payment = { network };
+
+  lazy.prop(o, 'address', () => {
+    if (!o.hash) return;
+
+    const words = bech32.toWords(o.hash);
+    words.unshift(0x00);
+    return bech32.encode(network.bech32, words);
+  });
+  lazy.prop(o, 'hash', () => {
+    if (a.output) return a.output.slice(2, 22);
+    if (a.address) return _address().data;
+    if (a.pubkey || o.pubkey) return bcrypto.hash160(a.pubkey! || o.pubkey!);
+  });
+  lazy.prop(o, 'output', () => {
+    if (!o.hash) return;
+    return bscript.compile([OPS.OP_0, o.hash]);
+  });
+  lazy.prop(o, 'pubkey', () => {
+    if (a.pubkey) return a.pubkey;
+    if (!a.witness) return;
+    return a.witness[1];
+  });
+  lazy.prop(o, 'signature', () => {
+    if (!a.witness) return;
+    return a.witness[0];
+  });
+  lazy.prop(o, 'input', () => {
+    if (!o.witness) return;
+    return EMPTY_BUFFER;
+  });
+  lazy.prop(o, 'witness', () => {
+    if (!a.pubkey) return;
+    if (!a.signature) return;
+    return [a.signature, a.pubkey];
+  });
+
+  // extended validation
+  if (opts.validate) {
+    let hash: Buffer = Buffer.from([]);
+    if (a.address) {
+      if (network && network.bech32 !== _address().prefix)
+        throw new TypeError('Invalid prefix or Network mismatch');
+      if (_address().version !== 0x00)
+        throw new TypeError('Invalid address version');
+      if (_address().data.length !== 20)
+        throw new TypeError('Invalid address data');
+      hash = _address().data;
+    }
+
+    if (a.hash) {
+      if (hash.length > 0 && !hash.equals(a.hash))
+        throw new TypeError('Hash mismatch');
+      else hash = a.hash;
+    }
+
+    if (a.output) {
+      if (
+        a.output.length !== 22 ||
+        a.output[0] !== OPS.OP_0 ||
+        a.output[1] !== 0x14
+      )
+        throw new TypeError('Output is invalid');
+      if (hash.length > 0 && !hash.equals(a.output.slice(2)))
+        throw new TypeError('Hash mismatch');
+      else hash = a.output.slice(2);
+    }
+
+    if (a.pubkey) {
+      const pkh = bcrypto.hash160(a.pubkey);
+      if (hash.length > 0 && !hash.equals(pkh))
+        throw new TypeError('Hash mismatch');
+      else hash = pkh;
+    }
+
+    if (a.witness) {
+      if (a.witness.length !== 2) throw new TypeError('Witness is invalid');
+      if (!bscript.isCanonicalScriptSignature(a.witness[0]))
+        throw new TypeError('Witness has invalid signature');
+      if (!ecc.isPoint(a.witness[1]))
+        throw new TypeError('Witness has invalid pubkey');
+
+      if (a.signature && !a.signature.equals(a.witness[0]))
+        throw new TypeError('Signature mismatch');
+      if (a.pubkey && !a.pubkey.equals(a.witness[1]))
+        throw new TypeError('Pubkey mismatch');
+
+      const pkh = bcrypto.hash160(a.witness[1]);
+      if (hash.length > 0 && !hash.equals(pkh))
+        throw new TypeError('Hash mismatch');
+    }
+  }
+
+  return Object.assign(o, a);
+}

ts_src/payments/p2wsh.ts

@@ -0,0 +1,198 @@
+import * as bcrypto from '../crypto';
+import { bitcoin as BITCOIN_NETWORK } from '../networks';
+import * as bscript from '../script';
+import { Payment, PaymentOpts, StackFunction } from './index';
+import * as lazy from './lazy';
+const typef = require('typeforce');
+const OPS = bscript.OPS;
+
+const bech32 = require('bech32');
+
+const EMPTY_BUFFER = Buffer.alloc(0);
+
+function stacksEqual(a: Buffer[], b: Buffer[]): boolean {
+  if (a.length !== b.length) return false;
+
+  return a.every((x, i) => {
+    return x.equals(b[i]);
+  });
+}
+
+// input: <>
+// witness: [redeemScriptSig ...] {redeemScript}
+// output: OP_0 {sha256(redeemScript)}
+export function p2wsh(a: Payment, opts?: PaymentOpts): Payment {
+  if (!a.address && !a.hash && !a.output && !a.redeem && !a.witness)
+    throw new TypeError('Not enough data');
+  opts = Object.assign({ validate: true }, opts || {});
+
+  typef(
+    {
+      network: typef.maybe(typef.Object),
+
+      address: typef.maybe(typef.String),
+      hash: typef.maybe(typef.BufferN(32)),
+      output: typef.maybe(typef.BufferN(34)),
+
+      redeem: typef.maybe({
+        input: typef.maybe(typef.Buffer),
+        network: typef.maybe(typef.Object),
+        output: typef.maybe(typef.Buffer),
+        witness: typef.maybe(typef.arrayOf(typef.Buffer)),
+      }),
+      input: typef.maybe(typef.BufferN(0)),
+      witness: typef.maybe(typef.arrayOf(typef.Buffer)),
+    },
+    a,
+  );
+
+  const _address = lazy.value(() => {
+    const result = bech32.decode(a.address);
+    const version = result.words.shift();
+    const data = bech32.fromWords(result.words);
+    return {
+      version,
+      prefix: result.prefix,
+      data: Buffer.from(data),
+    };
+  });
+  const _rchunks = lazy.value(() => {
+    return bscript.decompile(a.redeem!.input!);
+  }) as StackFunction;
+
+  let network = a.network;
+  if (!network) {
+    network = (a.redeem && a.redeem.network) || BITCOIN_NETWORK;
+  }
+
+  const o: Payment = { network };
+
+  lazy.prop(o, 'address', () => {
+    if (!o.hash) return;
+    const words = bech32.toWords(o.hash);
+    words.unshift(0x00);
+    return bech32.encode(network!.bech32, words);
+  });
+  lazy.prop(o, 'hash', () => {
+    if (a.output) return a.output.slice(2);
+    if (a.address) return _address().data;
+    if (o.redeem && o.redeem.output) return bcrypto.sha256(o.redeem.output);
+  });
+  lazy.prop(o, 'output', () => {
+    if (!o.hash) return;
+    return bscript.compile([OPS.OP_0, o.hash]);
+  });
+  lazy.prop(o, 'redeem', () => {
+    if (!a.witness) return;
+    return {
+      output: a.witness[a.witness.length - 1],
+      input: EMPTY_BUFFER,
+      witness: a.witness.slice(0, -1),
+    };
+  });
+  lazy.prop(o, 'input', () => {
+    if (!o.witness) return;
+    return EMPTY_BUFFER;
+  });
+  lazy.prop(o, 'witness', () => {
+    // transform redeem input to witness stack?
+    if (
+      a.redeem &&
+      a.redeem.input &&
+      a.redeem.input.length > 0 &&
+      a.redeem.output &&
+      a.redeem.output.length > 0
+    ) {
+      const stack = bscript.toStack(_rchunks());
+
+      // assign, and blank the existing input
+      o.redeem = Object.assign({ witness: stack }, a.redeem);
+      o.redeem.input = EMPTY_BUFFER;
+      return ([] as Buffer[]).concat(stack, a.redeem.output);
+    }
+
+    if (!a.redeem) return;
+    if (!a.redeem.output) return;
+    if (!a.redeem.witness) return;
+    return ([] as Buffer[]).concat(a.redeem.witness, a.redeem.output);
+  });
+
+  // extended validation
+  if (opts.validate) {
+    let hash: Buffer = Buffer.from([]);
+    if (a.address) {
+      if (_address().prefix !== network.bech32)
+        throw new TypeError('Invalid prefix or Network mismatch');
+      if (_address().version !== 0x00)
+        throw new TypeError('Invalid address version');
+      if (_address().data.length !== 32)
+        throw new TypeError('Invalid address data');
+      hash = _address().data;
+    }
+
+    if (a.hash) {
+      if (hash.length > 0 && !hash.equals(a.hash))
+        throw new TypeError('Hash mismatch');
+      else hash = a.hash;
+    }
+
+    if (a.output) {
+      if (
+        a.output.length !== 34 ||
+        a.output[0] !== OPS.OP_0 ||
+        a.output[1] !== 0x20
+      )
+        throw new TypeError('Output is invalid');
+      const hash2 = a.output.slice(2);
+      if (hash.length > 0 && !hash.equals(hash2))
+        throw new TypeError('Hash mismatch');
+      else hash = hash2;
+    }
+
+    if (a.redeem) {
+      if (a.redeem.network && a.redeem.network !== network)
+        throw new TypeError('Network mismatch');
+
+      // is there two redeem sources?
+      if (
+        a.redeem.input &&
+        a.redeem.input.length > 0 &&
+        a.redeem.witness &&
+        a.redeem.witness.length > 0
+      )
+        throw new TypeError('Ambiguous witness source');
+
+      // is the redeem output non-empty?
+      if (a.redeem.output) {
+        if (bscript.decompile(a.redeem.output)!.length === 0)
+          throw new TypeError('Redeem.output is invalid');
+
+        // match hash against other sources
+        const hash2 = bcrypto.sha256(a.redeem.output);
+        if (hash.length > 0 && !hash.equals(hash2))
+          throw new TypeError('Hash mismatch');
+        else hash = hash2;
+      }
+
+      if (a.redeem.input && !bscript.isPushOnly(_rchunks()))
+        throw new TypeError('Non push-only scriptSig');
+      if (
+        a.witness &&
+        a.redeem.witness &&
+        !stacksEqual(a.witness, a.redeem.witness)
+      )
+        throw new TypeError('Witness and redeem.witness mismatch');
+    }
+
+    if (a.witness) {
+      if (
+        a.redeem &&
+        a.redeem.output &&
+        !a.redeem.output.equals(a.witness[a.witness.length - 1])
+      )
+        throw new TypeError('Witness and redeem.output mismatch');
+    }
+  }
+
+  return Object.assign(o, a);
+}

ts_src/script.ts

@@ -0,0 +1,216 @@
+import { Stack } from './payments';
+import * as scriptNumber from './script_number';
+import * as scriptSignature from './script_signature';
+import * as types from './types';
+const bip66 = require('bip66');
+const ecc = require('tiny-secp256k1');
+const pushdata = require('pushdata-bitcoin');
+const typeforce = require('typeforce');
+
+export type OpCode = number;
+export const OPS = require('bitcoin-ops') as { [index: string]: OpCode };
+
+const REVERSE_OPS = require('bitcoin-ops/map') as { [index: number]: string };
+const OP_INT_BASE = OPS.OP_RESERVED; // OP_1 - 1
+
+function isOPInt(value: number): boolean {
+  return (
+    types.Number(value) &&
+    (value === OPS.OP_0 ||
+      (value >= OPS.OP_1 && value <= OPS.OP_16) ||
+      value === OPS.OP_1NEGATE)
+  );
+}
+
+function isPushOnlyChunk(value: number | Buffer): boolean {
+  return types.Buffer(value) || isOPInt(value as number);
+}
+
+export function isPushOnly(value: Stack): boolean {
+  return types.Array(value) && value.every(isPushOnlyChunk);
+}
+
+function asMinimalOP(buffer: Buffer): number | void {
+  if (buffer.length === 0) return OPS.OP_0;
+  if (buffer.length !== 1) return;
+  if (buffer[0] >= 1 && buffer[0] <= 16) return OP_INT_BASE + buffer[0];
+  if (buffer[0] === 0x81) return OPS.OP_1NEGATE;
+}
+
+function chunksIsBuffer(buf: Buffer | Stack): buf is Buffer {
+  return Buffer.isBuffer(buf);
+}
+
+function chunksIsArray(buf: Buffer | Stack): buf is Stack {
+  return types.Array(buf);
+}
+
+function singleChunkIsBuffer(buf: number | Buffer): buf is Buffer {
+  return Buffer.isBuffer(buf);
+}
+
+export function compile(chunks: Buffer | Stack): Buffer {
+  // TODO: remove me
+  if (chunksIsBuffer(chunks)) return chunks;
+
+  typeforce(types.Array, chunks);
+
+  const bufferSize = chunks.reduce((accum: number, chunk) => {
+    // data chunk
+    if (singleChunkIsBuffer(chunk)) {
+      // adhere to BIP62.3, minimal push policy
+      if (chunk.length === 1 && asMinimalOP(chunk) !== undefined) {
+        return accum + 1;
+      }
+
+      return accum + pushdata.encodingLength(chunk.length) + chunk.length;
+    }
+
+    // opcode
+    return accum + 1;
+  }, 0.0);
+
+  const buffer = Buffer.allocUnsafe(bufferSize);
+  let offset = 0;
+
+  chunks.forEach(chunk => {
+    // data chunk
+    if (singleChunkIsBuffer(chunk)) {
+      // adhere to BIP62.3, minimal push policy
+      const opcode = asMinimalOP(chunk);
+      if (opcode !== undefined) {
+        buffer.writeUInt8(opcode, offset);
+        offset += 1;
+        return;
+      }
+
+      offset += pushdata.encode(buffer, chunk.length, offset);
+      chunk.copy(buffer, offset);
+      offset += chunk.length;
+
+      // opcode
+    } else {
+      buffer.writeUInt8(chunk, offset);
+      offset += 1;
+    }
+  });
+
+  if (offset !== buffer.length) throw new Error('Could not decode chunks');
+  return buffer;
+}
+
+export function decompile(
+  buffer: Buffer | Array<number | Buffer>,
+): Array<number | Buffer> | null {
+  // TODO: remove me
+  if (chunksIsArray(buffer)) return buffer;
+
+  typeforce(types.Buffer, buffer);
+
+  const chunks: Array<number | Buffer> = [];
+  let i = 0;
+
+  while (i < buffer.length) {
+    const opcode = buffer[i];
+
+    // data chunk
+    if (opcode > OPS.OP_0 && opcode <= OPS.OP_PUSHDATA4) {
+      const d = pushdata.decode(buffer, i);
+
+      // did reading a pushDataInt fail?
+      if (d === null) return null;
+      i += d.size;
+
+      // attempt to read too much data?
+      if (i + d.number > buffer.length) return null;
+
+      const data = buffer.slice(i, i + d.number);
+      i += d.number;
+
+      // decompile minimally
+      const op = asMinimalOP(data);
+      if (op !== undefined) {
+        chunks.push(op);
+      } else {
+        chunks.push(data);
+      }
+
+      // opcode
+    } else {
+      chunks.push(opcode);
+
+      i += 1;
+    }
+  }
+
+  return chunks;
+}
+
+export function toASM(chunks: Buffer | Array<number | Buffer>): string {
+  if (chunksIsBuffer(chunks)) {
+    chunks = decompile(chunks) as Stack;
+  }
+
+  return chunks
+    .map(chunk => {
+      // data?
+      if (singleChunkIsBuffer(chunk)) {
+        const op = asMinimalOP(chunk);
+        if (op === undefined) return chunk.toString('hex');
+        chunk = op as number;
+      }
+
+      // opcode!
+      return REVERSE_OPS[chunk];
+    })
+    .join(' ');
+}
+
+export function fromASM(asm: string): Buffer {
+  typeforce(types.String, asm);
+
+  return compile(
+    asm.split(' ').map(chunkStr => {
+      // opcode?
+      if (OPS[chunkStr] !== undefined) return OPS[chunkStr];
+      typeforce(types.Hex, chunkStr);
+
+      // data!
+      return Buffer.from(chunkStr, 'hex');
+    }),
+  );
+}
+
+export function toStack(chunks: Buffer | Array<number | Buffer>): Buffer[] {
+  chunks = decompile(chunks) as Stack;
+  typeforce(isPushOnly, chunks);
+
+  return chunks.map(op => {
+    if (singleChunkIsBuffer(op)) return op;
+    if (op === OPS.OP_0) return Buffer.allocUnsafe(0);
+
+    return scriptNumber.encode(op - OP_INT_BASE);
+  });
+}
+
+export function isCanonicalPubKey(buffer: Buffer): boolean {
+  return ecc.isPoint(buffer);
+}
+
+export function isDefinedHashType(hashType: number): boolean {
+  const hashTypeMod = hashType & ~0x80;
+
+  // return hashTypeMod > SIGHASH_ALL && hashTypeMod < SIGHASH_SINGLE
+  return hashTypeMod > 0x00 && hashTypeMod < 0x04;
+}
+
+export function isCanonicalScriptSignature(buffer: Buffer): boolean {
+  if (!Buffer.isBuffer(buffer)) return false;
+  if (!isDefinedHashType(buffer[buffer.length - 1])) return false;
+
+  return bip66.check(buffer.slice(0, -1));
+}
+
+// tslint:disable-next-line variable-name
+export const number = scriptNumber;
+export const signature = scriptSignature;

ts_src/script_number.ts

@@ -0,0 +1,71 @@
+export function decode(
+  buffer: Buffer,
+  maxLength?: number,
+  minimal?: boolean,
+): number {
+  maxLength = maxLength || 4;
+  minimal = minimal === undefined ? true : minimal;
+
+  const length = buffer.length;
+  if (length === 0) return 0;
+  if (length > maxLength) throw new TypeError('Script number overflow');
+  if (minimal) {
+    if ((buffer[length - 1] & 0x7f) === 0) {
+      if (length <= 1 || (buffer[length - 2] & 0x80) === 0)
+        throw new Error('Non-minimally encoded script number');
+    }
+  }
+
+  // 40-bit
+  if (length === 5) {
+    const a = buffer.readUInt32LE(0);
+    const b = buffer.readUInt8(4);
+
+    if (b & 0x80) return -((b & ~0x80) * 0x100000000 + a);
+    return b * 0x100000000 + a;
+  }
+
+  // 32-bit / 24-bit / 16-bit / 8-bit
+  let result = 0;
+  for (let i = 0; i < length; ++i) {
+    result |= buffer[i] << (8 * i);
+  }
+
+  if (buffer[length - 1] & 0x80)
+    return -(result & ~(0x80 << (8 * (length - 1))));
+  return result;
+}
+
+function scriptNumSize(i: number): number {
+  return i > 0x7fffffff
+    ? 5
+    : i > 0x7fffff
+    ? 4
+    : i > 0x7fff
+    ? 3
+    : i > 0x7f
+    ? 2
+    : i > 0x00
+    ? 1
+    : 0;
+}
+
+export function encode(_number: number): Buffer {
+  let value = Math.abs(_number);
+  const size = scriptNumSize(value);
+  const buffer = Buffer.allocUnsafe(size);
+  const negative = _number < 0;
+
+  for (let i = 0; i < size; ++i) {
+    buffer.writeUInt8(value & 0xff, i);
+    value >>= 8;
+  }
+
+  if (buffer[size - 1] & 0x80) {
+    buffer.writeUInt8(negative ? 0x80 : 0x00, size - 1);
+  } else if (negative) {
+    buffer[size - 1] |= 0x80;
+  }
+
+  return buffer;
+}

ts_src/script_signature.ts

@@ -0,0 +1,64 @@
+import * as types from './types';
+const bip66 = require('bip66');
+
+const typeforce = require('typeforce');
+
+const ZERO = Buffer.alloc(1, 0);
+function toDER(x: Buffer): Buffer {
+  let i = 0;
+  while (x[i] === 0) ++i;
+  if (i === x.length) return ZERO;
+  x = x.slice(i);
+  if (x[0] & 0x80) return Buffer.concat([ZERO, x], 1 + x.length);
+  return x;
+}
+
+function fromDER(x: Buffer): Buffer {
+  if (x[0] === 0x00) x = x.slice(1);
+  const buffer = Buffer.alloc(32, 0);
+  const bstart = Math.max(0, 32 - x.length);
+  x.copy(buffer, bstart);
+  return buffer;
+}
+
+interface ScriptSignature {
+  signature: Buffer;
+  hashType: number;
+}
+
+// BIP62: 1 byte hashType flag (only 0x01, 0x02, 0x03, 0x81, 0x82 and 0x83 are allowed)
+export function decode(buffer: Buffer): ScriptSignature {
+  const hashType = buffer.readUInt8(buffer.length - 1);
+  const hashTypeMod = hashType & ~0x80;
+  if (hashTypeMod <= 0 || hashTypeMod >= 4)
+    throw new Error('Invalid hashType ' + hashType);
+
+  const decoded = bip66.decode(buffer.slice(0, -1));
+  const r = fromDER(decoded.r);
+  const s = fromDER(decoded.s);
+  const signature = Buffer.concat([r, s], 64);
+
+  return { signature, hashType };
+}
+
+export function encode(signature: Buffer, hashType: number): Buffer {
+  typeforce(
+    {
+      signature: types.BufferN(64),
+      hashType: types.UInt8,
+    },
+    { signature, hashType },
+  );
+
+  const hashTypeMod = hashType & ~0x80;
+  if (hashTypeMod <= 0 || hashTypeMod >= 4)
+    throw new Error('Invalid hashType ' + hashType);
+
+  const hashTypeBuffer = Buffer.allocUnsafe(1);
+  hashTypeBuffer.writeUInt8(hashType, 0);
+
+  const r = toDER(signature.slice(0, 32));
+  const s = toDER(signature.slice(32, 64));
+
+  return Buffer.concat([bip66.encode(r, s), hashTypeBuffer]);
+}

ts_src/templates/multisig/index.ts

@@ -0,0 +1,4 @@
+import * as input from './input';
+import * as output from './output';
+
+export { input, output };

ts_src/templates/multisig/input.ts

@@ -0,0 +1,31 @@
+// OP_0 [signatures ...]
+
+import { Stack } from '../../payments';
+import * as bscript from '../../script';
+import { OPS } from '../../script';
+
+function partialSignature(value: number | Buffer): boolean {
+  return (
+    value === OPS.OP_0 || bscript.isCanonicalScriptSignature(value as Buffer)
+  );
+}
+
+export function check(
+  script: Buffer | Stack,
+  allowIncomplete?: boolean,
+): boolean {
+  const chunks = bscript.decompile(script) as Stack;
+  if (chunks.length < 2) return false;
+  if (chunks[0] !== OPS.OP_0) return false;
+
+  if (allowIncomplete) {
+    return chunks.slice(1).every(partialSignature);
+  }
+
+  return (chunks.slice(1) as Buffer[]).every(
+    bscript.isCanonicalScriptSignature,
+  );
+}
+check.toJSON = (): string => {
+  return 'multisig input';
+};

ts_src/templates/multisig/output.ts

@@ -0,0 +1,33 @@
+// m [pubKeys ...] n OP_CHECKMULTISIG
+
+import { Stack } from '../../payments';
+import * as bscript from '../../script';
+import { OPS } from '../../script';
+import * as types from '../../types';
+const OP_INT_BASE = OPS.OP_RESERVED; // OP_1 - 1
+
+export function check(
+  script: Buffer | Stack,
+  allowIncomplete?: boolean,
+): boolean {
+  const chunks = bscript.decompile(script) as Stack;
+
+  if (chunks.length < 4) return false;
+  if (chunks[chunks.length - 1] !== OPS.OP_CHECKMULTISIG) return false;
+  if (!types.Number(chunks[0])) return false;
+  if (!types.Number(chunks[chunks.length - 2])) return false;
+  const m = (chunks[0] as number) - OP_INT_BASE;
+  const n = (chunks[chunks.length - 2] as number) - OP_INT_BASE;
+
+  if (m <= 0) return false;
+  if (n > 16) return false;
+  if (m > n) return false;
+  if (n !== chunks.length - 3) return false;
+  if (allowIncomplete) return true;
+
+  const keys = chunks.slice(1, -2) as Buffer[];
+  return keys.every(bscript.isCanonicalPubKey);
+}
+check.toJSON = (): string => {
+  return 'multi-sig output';
+};

ts_src/templates/nulldata.ts

@@ -0,0 +1,16 @@
+// OP_RETURN {data}
+import * as bscript from '../script';
+const OPS = bscript.OPS;
+
+export function check(script: Buffer | Array<number | Buffer>): boolean {
+  const buffer = bscript.compile(script);
+
+  return buffer.length > 1 && buffer[0] === OPS.OP_RETURN;
+}
+check.toJSON = (): string => {
+  return 'null data output';
+};
+
+const output = { check };
+
+export { output };

ts_src/templates/pubkey/index.ts

@@ -0,0 +1,4 @@
+import * as input from './input';
+import * as output from './output';
+
+export { input, output };

ts_src/templates/pubkey/input.ts

@@ -0,0 +1,16 @@
+// {signature}
+
+import { Stack } from '../../payments';
+import * as bscript from '../../script';
+
+export function check(script: Buffer | Stack): boolean {
+  const chunks = bscript.decompile(script) as Stack;
+
+  return (
+    chunks.length === 1 &&
+    bscript.isCanonicalScriptSignature(chunks[0] as Buffer)
+  );
+}
+check.toJSON = (): string => {
+  return 'pubKey input';
+};

ts_src/templates/pubkey/output.ts

@@ -0,0 +1,18 @@
+// {pubKey} OP_CHECKSIG
+
+import { Stack } from '../../payments';
+import * as bscript from '../../script';
+import { OPS } from '../../script';
+
+export function check(script: Buffer | Stack): boolean {
+  const chunks = bscript.decompile(script) as Stack;
+
+  return (
+    chunks.length === 2 &&
+    bscript.isCanonicalPubKey(chunks[0] as Buffer) &&
+    chunks[1] === OPS.OP_CHECKSIG
+  );
+}
+check.toJSON = (): string => {
+  return 'pubKey output';
+};

ts_src/templates/pubkeyhash/index.ts

@@ -0,0 +1,4 @@
+import * as input from './input';
+import * as output from './output';
+
+export { input, output };

ts_src/templates/pubkeyhash/input.ts

@@ -0,0 +1,17 @@
+// {signature} {pubKey}
+
+import { Stack } from '../../payments';
+import * as bscript from '../../script';
+
+export function check(script: Buffer | Stack): boolean {
+  const chunks = bscript.decompile(script) as Stack;
+
+  return (
+    chunks.length === 2 &&
+    bscript.isCanonicalScriptSignature(chunks[0] as Buffer) &&
+    bscript.isCanonicalPubKey(chunks[1] as Buffer)
+  );
+}
+check.toJSON = (): string => {
+  return 'pubKeyHash input';
+};

ts_src/templates/pubkeyhash/output.ts

@@ -0,0 +1,20 @@
+// OP_DUP OP_HASH160 {pubKeyHash} OP_EQUALVERIFY OP_CHECKSIG
+
+import * as bscript from '../../script';
+import { OPS } from '../../script';
+
+export function check(script: Buffer | Array<number | Buffer>): boolean {
+  const buffer = bscript.compile(script);
+
+  return (
+    buffer.length === 25 &&
+    buffer[0] === OPS.OP_DUP &&
+    buffer[1] === OPS.OP_HASH160 &&
+    buffer[2] === 0x14 &&
+    buffer[23] === OPS.OP_EQUALVERIFY &&
+    buffer[24] === OPS.OP_CHECKSIG
+  );
+}
+check.toJSON = (): string => {
+  return 'pubKeyHash output';
+};

ts_src/templates/scripthash/index.ts

@@ -0,0 +1,4 @@
+import * as input from './input';
+import * as output from './output';
+
+export { input, output };

ts_src/templates/scripthash/input.ts

@@ -0,0 +1,61 @@
+// <scriptSig> {serialized scriptPubKey script}
+
+import * as bscript from '../../script';
+import * as p2ms from '../multisig';
+import * as p2pk from '../pubkey';
+import * as p2pkh from '../pubkeyhash';
+import * as p2wpkho from '../witnesspubkeyhash/output';
+import * as p2wsho from '../witnessscripthash/output';
+
+export function check(
+  script: Buffer | Array<number | Buffer>,
+  allowIncomplete?: boolean,
+): boolean {
+  const chunks = bscript.decompile(script)!;
+  if (chunks.length < 1) return false;
+
+  const lastChunk = chunks[chunks.length - 1];
+  if (!Buffer.isBuffer(lastChunk)) return false;
+
+  const scriptSigChunks = bscript.decompile(
+    bscript.compile(chunks.slice(0, -1)),
+  )!;
+  const redeemScriptChunks = bscript.decompile(lastChunk);
+
+  // is redeemScript a valid script?
+  if (!redeemScriptChunks) return false;
+
+  // is redeemScriptSig push only?
+  if (!bscript.isPushOnly(scriptSigChunks)) return false;
+
+  // is witness?
+  if (chunks.length === 1) {
+    return (
+      p2wsho.check(redeemScriptChunks) || p2wpkho.check(redeemScriptChunks)
+    );
+  }
+
+  // match types
+  if (
+    p2pkh.input.check(scriptSigChunks) &&
+    p2pkh.output.check(redeemScriptChunks)
+  )
+    return true;
+
+  if (
+    p2ms.input.check(scriptSigChunks, allowIncomplete) &&
+    p2ms.output.check(redeemScriptChunks)
+  )
+    return true;
+
+  if (
+    p2pk.input.check(scriptSigChunks) &&
+    p2pk.output.check(redeemScriptChunks)
+  )
+    return true;
+
+  return false;
+}
+check.toJSON = (): string => {
+  return 'scriptHash input';
+};

ts_src/templates/scripthash/output.ts

@@ -0,0 +1,18 @@
+// OP_HASH160 {scriptHash} OP_EQUAL
+
+import * as bscript from '../../script';
+import { OPS } from '../../script';
+
+export function check(script: Buffer | Array<number | Buffer>): boolean {
+  const buffer = bscript.compile(script);
+
+  return (
+    buffer.length === 23 &&
+    buffer[0] === OPS.OP_HASH160 &&
+    buffer[1] === 0x14 &&
+    buffer[22] === OPS.OP_EQUAL
+  );
+}
+check.toJSON = (): string => {
+  return 'scriptHash output';
+};

ts_src/templates/witnesscommitment/index.ts

@@ -0,0 +1,3 @@
+import * as output from './output';
+
+export { output };

ts_src/templates/witnesscommitment/output.ts

@@ -0,0 +1,40 @@
+// OP_RETURN {aa21a9ed} {commitment}
+
+import * as bscript from '../../script';
+import { OPS } from '../../script';
+import * as types from '../../types';
+
+const typeforce = require('typeforce');
+
+const HEADER: Buffer = Buffer.from('aa21a9ed', 'hex');
+
+export function check(script: Buffer | Array<number | Buffer>): boolean {
+  const buffer = bscript.compile(script);
+
+  return (
+    buffer.length > 37 &&
+    buffer[0] === OPS.OP_RETURN &&
+    buffer[1] === 0x24 &&
+    buffer.slice(2, 6).equals(HEADER)
+  );
+}
+
+check.toJSON = (): string => {
+  return 'Witness commitment output';
+};
+
+export function encode(commitment: Buffer): Buffer {
+  typeforce(types.Hash256bit, commitment);
+
+  const buffer = Buffer.allocUnsafe(36);
+  HEADER.copy(buffer, 0);
+  commitment.copy(buffer, 4);
+
+  return bscript.compile([OPS.OP_RETURN, buffer]);
+}
+
+export function decode(buffer: Buffer): Buffer {
+  typeforce(check, buffer);
+
+  return (bscript.decompile(buffer)![1] as Buffer).slice(4, 36);
+}

ts_src/templates/witnesspubkeyhash/index.ts

@@ -0,0 +1,4 @@
+import * as input from './input';
+import * as output from './output';
+
+export { input, output };

ts_src/templates/witnesspubkeyhash/input.ts

@@ -0,0 +1,21 @@
+// {signature} {pubKey}
+
+import { Stack } from '../../payments';
+import * as bscript from '../../script';
+
+function isCompressedCanonicalPubKey(pubKey: Buffer): boolean {
+  return bscript.isCanonicalPubKey(pubKey) && pubKey.length === 33;
+}
+
+export function check(script: Buffer | Stack): boolean {
+  const chunks = bscript.decompile(script) as Stack;
+
+  return (
+    chunks.length === 2 &&
+    bscript.isCanonicalScriptSignature(chunks[0] as Buffer) &&
+    isCompressedCanonicalPubKey(chunks[1] as Buffer)
+  );
+}
+check.toJSON = (): string => {
+  return 'witnessPubKeyHash input';
+};

ts_src/templates/witnesspubkeyhash/output.ts

@@ -0,0 +1,13 @@
+// OP_0 {pubKeyHash}
+
+import * as bscript from '../../script';
+import { OPS } from '../../script';
+
+export function check(script: Buffer | Array<number | Buffer>): boolean {
+  const buffer = bscript.compile(script);
+
+  return buffer.length === 22 && buffer[0] === OPS.OP_0 && buffer[1] === 0x14;
+}
+check.toJSON = (): string => {
+  return 'Witness pubKeyHash output';
+};

ts_src/templates/witnessscripthash/index.ts

@@ -0,0 +1,4 @@
+import * as input from './input';
+import * as output from './output';
+
+export { input, output };

ts_src/templates/witnessscripthash/input.ts

@@ -0,0 +1,47 @@
+// <scriptSig> {serialized scriptPubKey script}
+
+import * as bscript from '../../script';
+const typeforce = require('typeforce');
+
+import * as p2ms from '../multisig';
+import * as p2pk from '../pubkey';
+import * as p2pkh from '../pubkeyhash';
+
+export function check(chunks: Buffer[], allowIncomplete?: boolean): boolean {
+  typeforce(typeforce.Array, chunks);
+  if (chunks.length < 1) return false;
+
+  const witnessScript = chunks[chunks.length - 1];
+  if (!Buffer.isBuffer(witnessScript)) return false;
+
+  const witnessScriptChunks = bscript.decompile(witnessScript);
+
+  // is witnessScript a valid script?
+  if (!witnessScriptChunks || witnessScriptChunks.length === 0) return false;
+
+  const witnessRawScriptSig = bscript.compile(chunks.slice(0, -1));
+
+  // match types
+  if (
+    p2pkh.input.check(witnessRawScriptSig) &&
+    p2pkh.output.check(witnessScriptChunks)
+  )
+    return true;
+
+  if (
+    p2ms.input.check(witnessRawScriptSig, allowIncomplete) &&
+    p2ms.output.check(witnessScriptChunks)
+  )
+    return true;
+
+  if (
+    p2pk.input.check(witnessRawScriptSig) &&
+    p2pk.output.check(witnessScriptChunks)
+  )
+    return true;
+
+  return false;
+}
+check.toJSON = (): string => {
+  return 'witnessScriptHash input';
+};

ts_src/templates/witnessscripthash/output.ts

@@ -0,0 +1,13 @@
+// OP_0 {scriptHash}
+
+import * as bscript from '../../script';
+import { OPS } from '../../script';
+
+export function check(script: Buffer | Array<number | Buffer>): boolean {
+  const buffer = bscript.compile(script);
+
+  return buffer.length === 34 && buffer[0] === OPS.OP_0 && buffer[1] === 0x20;
+}
+check.toJSON = (): string => {
+  return 'Witness scriptHash output';
+};