468 lines
13 KiB
JavaScript
468 lines
13 KiB
JavaScript
var bcrypto = require('./crypto')
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var bscript = require('./script')
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var bufferutils = require('./bufferutils')
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var bufferReverse = require('buffer-reverse')
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var opcodes = require('./opcodes.json')
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var typeforce = require('typeforce')
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var types = require('./types')
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function varSliceSize (someScript) {
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var length = someScript.length
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return bufferutils.varIntSize(length) + length
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}
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function vectorSize (someVector) {
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var length = someVector.length
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return bufferutils.varIntSize(length) + someVector.reduce(function (sum, witness) {
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return sum + varSliceSize(witness)
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}, 0)
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}
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function Transaction () {
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this.version = 1
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this.locktime = 0
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this.ins = []
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this.outs = []
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}
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Transaction.DEFAULT_SEQUENCE = 0xffffffff
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Transaction.SIGHASH_ALL = 0x01
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Transaction.SIGHASH_NONE = 0x02
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Transaction.SIGHASH_SINGLE = 0x03
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Transaction.SIGHASH_ANYONECANPAY = 0x80
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Transaction.ADVANCED_TRANSACTION_MARKER = 0x00
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Transaction.ADVANCED_TRANSACTION_FLAG = 0x01
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var EMPTY_SCRIPT = new Buffer(0)
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var EMPTY_WITNESS = []
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var ZERO = new Buffer('0000000000000000000000000000000000000000000000000000000000000000', 'hex')
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var ONE = new Buffer('0000000000000000000000000000000000000000000000000000000000000001', 'hex')
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var VALUE_UINT64_MAX = new Buffer('ffffffffffffffff', 'hex')
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var BLANK_OUTPUT = {
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script: EMPTY_SCRIPT,
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valueBuffer: VALUE_UINT64_MAX
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}
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Transaction.fromBuffer = function (buffer, __noStrict) {
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var offset = 0
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function readSlice (n) {
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offset += n
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return buffer.slice(offset - n, offset)
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}
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function readUInt32 () {
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var i = buffer.readUInt32LE(offset)
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offset += 4
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return i
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}
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function readInt32 () {
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var i = buffer.readInt32LE(offset)
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offset += 4
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return i
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}
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function readUInt64 () {
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var i = bufferutils.readUInt64LE(buffer, offset)
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offset += 8
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return i
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}
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function readVarInt () {
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var vi = bufferutils.readVarInt(buffer, offset)
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offset += vi.size
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return vi.number
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}
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function readVarSlice () {
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return readSlice(readVarInt())
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}
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function readVector () {
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var count = readVarInt()
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var vector = []
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for (var i = 0; i < count; i++) vector.push(readVarSlice())
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return vector
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}
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var tx = new Transaction()
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tx.version = readInt32()
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var marker = buffer.readUInt8(offset)
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var flag = buffer.readUInt8(offset + 1)
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var hasWitnesses = false
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if (marker === Transaction.ADVANCED_TRANSACTION_MARKER &&
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flag === Transaction.ADVANCED_TRANSACTION_FLAG) {
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offset += 2
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hasWitnesses = true
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}
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var vinLen = readVarInt()
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for (var i = 0; i < vinLen; ++i) {
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tx.ins.push({
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hash: readSlice(32),
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index: readUInt32(),
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script: readVarSlice(),
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sequence: readUInt32(),
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witness: EMPTY_WITNESS
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})
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}
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var voutLen = readVarInt()
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for (i = 0; i < voutLen; ++i) {
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tx.outs.push({
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value: readUInt64(),
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script: readVarSlice()
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})
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}
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if (hasWitnesses) {
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for (i = 0; i < vinLen; ++i) {
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tx.ins[i].witness = readVector()
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}
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// was this pointless?
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if (!tx._hasWitnesses()) throw new Error('Transaction has superfluous witness data')
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}
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tx.locktime = readUInt32()
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if (__noStrict) return tx
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if (offset !== buffer.length) throw new Error('Transaction has unexpected data')
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return tx
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}
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Transaction.fromHex = function (hex) {
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return Transaction.fromBuffer(new Buffer(hex, 'hex'))
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}
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Transaction.isCoinbaseHash = function (buffer) {
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typeforce(types.Hash256bit, buffer)
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for (var i = 0; i < 32; ++i) {
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if (buffer[i] !== 0) return false
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}
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return true
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}
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Transaction.prototype.isCoinbase = function () {
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return this.ins.length === 1 && Transaction.isCoinbaseHash(this.ins[0].hash)
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}
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Transaction.prototype.addInput = function (hash, index, sequence, scriptSig) {
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typeforce(types.tuple(
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types.Hash256bit,
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types.UInt32,
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types.maybe(types.UInt32),
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types.maybe(types.Buffer)
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), arguments)
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if (types.Null(sequence)) {
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sequence = Transaction.DEFAULT_SEQUENCE
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}
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// Add the input and return the input's index
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return (this.ins.push({
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hash: hash,
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index: index,
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script: scriptSig || EMPTY_SCRIPT,
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sequence: sequence,
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witness: EMPTY_WITNESS
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}) - 1)
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}
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Transaction.prototype.addOutput = function (scriptPubKey, value) {
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typeforce(types.tuple(types.Buffer, types.Satoshi), arguments)
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// Add the output and return the output's index
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return (this.outs.push({
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script: scriptPubKey,
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value: value
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}) - 1)
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}
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Transaction.prototype._hasWitnesses = function () {
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return this.ins.some(function (x) {
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return x.witness.length !== 0
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})
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}
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Transaction.prototype.byteLength = function () {
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var hasWitnesses = this._hasWitnesses()
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return (
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(hasWitnesses ? 10 : 8) +
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bufferutils.varIntSize(this.ins.length) +
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bufferutils.varIntSize(this.outs.length) +
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this.ins.reduce(function (sum, input) { return sum + 40 + varSliceSize(input.script) }, 0) +
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this.outs.reduce(function (sum, output) { return sum + 8 + varSliceSize(output.script) }, 0) +
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(hasWitnesses ? this.ins.reduce(function (sum, input) { return sum + vectorSize(input.witness) }, 0) : 0)
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)
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}
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Transaction.prototype.clone = function () {
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var newTx = new Transaction()
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newTx.version = this.version
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newTx.locktime = this.locktime
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newTx.ins = this.ins.map(function (txIn) {
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return {
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hash: txIn.hash,
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index: txIn.index,
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script: txIn.script,
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sequence: txIn.sequence,
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witness: txIn.witness
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}
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})
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newTx.outs = this.outs.map(function (txOut) {
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return {
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script: txOut.script,
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value: txOut.value
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}
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})
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return newTx
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}
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/**
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* Hash transaction for signing a specific input.
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*
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* Bitcoin uses a different hash for each signed transaction input.
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* This method copies the transaction, makes the necessary changes based on the
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* hashType, and then hashes the result.
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* This hash can then be used to sign the provided transaction input.
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*/
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Transaction.prototype.hashForSignature = function (inIndex, prevOutScript, hashType) {
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typeforce(types.tuple(types.UInt32, types.Buffer, /* types.UInt8 */ types.Number), arguments)
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// https://github.com/bitcoin/bitcoin/blob/master/src/test/sighash_tests.cpp#L29
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if (inIndex >= this.ins.length) return ONE
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// ignore OP_CODESEPARATOR
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var ourScript = bscript.compile(bscript.decompile(prevOutScript).filter(function (x) {
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return x !== opcodes.OP_CODESEPARATOR
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}))
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var txTmp = this.clone()
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// SIGHASH_NONE: ignore all outputs? (wildcard payee)
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if ((hashType & 0x1f) === Transaction.SIGHASH_NONE) {
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txTmp.outs = []
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// ignore sequence numbers (except at inIndex)
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txTmp.ins.forEach(function (input, i) {
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if (i === inIndex) return
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input.sequence = 0
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})
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// SIGHASH_SINGLE: ignore all outputs, except at the same index?
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} else if ((hashType & 0x1f) === Transaction.SIGHASH_SINGLE) {
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// https://github.com/bitcoin/bitcoin/blob/master/src/test/sighash_tests.cpp#L60
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if (inIndex >= this.outs.length) return ONE
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// truncate outputs after
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txTmp.outs.length = inIndex + 1
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// "blank" outputs before
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for (var i = 0; i < inIndex; i++) {
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txTmp.outs[i] = BLANK_OUTPUT
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}
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// ignore sequence numbers (except at inIndex)
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txTmp.ins.forEach(function (input, i) {
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if (i === inIndex) return
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input.sequence = 0
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})
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}
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// SIGHASH_ANYONECANPAY: ignore inputs entirely?
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if (hashType & Transaction.SIGHASH_ANYONECANPAY) {
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txTmp.ins = [txTmp.ins[inIndex]]
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txTmp.ins[0].script = ourScript
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// SIGHASH_ALL: only ignore input scripts
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} else {
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// "blank" others input scripts
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txTmp.ins.forEach(function (input) { input.script = EMPTY_SCRIPT })
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txTmp.ins[inIndex].script = ourScript
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}
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// serialize and hash
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var buffer = new Buffer(txTmp.byteLength() + 4)
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buffer.writeInt32LE(hashType, buffer.length - 4)
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txTmp.toBuffer(buffer, 0)
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return bcrypto.hash256(buffer)
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}
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Transaction.prototype.hashForWitnessV0 = function (inIndex, prevOutScript, value, hashType) {
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typeforce(types.tuple(types.UInt32, types.Buffer, types.Satoshi, types.UInt32), arguments)
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var tbuffer, toffset
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function writeSlice (slice) { toffset += slice.copy(tbuffer, toffset) }
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function writeUInt32 (i) { toffset = tbuffer.writeUInt32LE(i, toffset) }
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function writeUInt64 (i) { toffset = bufferutils.writeUInt64LE(tbuffer, i, toffset) }
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function writeVarInt (i) { toffset += bufferutils.writeVarInt(tbuffer, i, toffset) }
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function writeVarSlice (slice) { writeVarInt(slice.length); writeSlice(slice) }
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var hashOutputs = ZERO
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var hashPrevouts = ZERO
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var hashSequence = ZERO
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if (!(hashType & Transaction.SIGHASH_ANYONECANPAY)) {
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tbuffer = new Buffer(36 * this.ins.length)
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toffset = 0
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this.ins.forEach(function (txIn) {
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writeSlice(txIn.hash)
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writeUInt32(txIn.index)
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})
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hashPrevouts = bcrypto.hash256(tbuffer)
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}
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if (!(hashType & Transaction.SIGHASH_ANYONECANPAY) &&
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(hashType & 0x1f) !== Transaction.SIGHASH_SINGLE &&
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(hashType & 0x1f) !== Transaction.SIGHASH_NONE) {
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tbuffer = new Buffer(4 * this.ins.length)
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toffset = 0
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this.ins.forEach(function (txIn) {
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writeUInt32(txIn.sequence)
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})
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hashSequence = bcrypto.hash256(tbuffer)
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}
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if ((hashType & 0x1f) !== Transaction.SIGHASH_SINGLE &&
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(hashType & 0x1f) !== Transaction.SIGHASH_NONE) {
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var txOutsSize = this.outs.reduce(function (sum, output) {
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return sum + 8 + varSliceSize(output.script)
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}, 0)
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tbuffer = new Buffer(txOutsSize)
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toffset = 0
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this.outs.forEach(function (out) {
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writeUInt64(out.value)
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writeVarSlice(out.script)
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})
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hashOutputs = bcrypto.hash256(tbuffer)
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} else if ((hashType & 0x1f) === Transaction.SIGHASH_SINGLE && inIndex < this.outs.length) {
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var output = this.outs[inIndex]
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tbuffer = new Buffer(8 + varSliceSize(output.script))
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toffset = 0
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writeUInt64(output.value)
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writeVarSlice(output.script)
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hashOutputs = bcrypto.hash256(tbuffer)
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}
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tbuffer = new Buffer(156 + varSliceSize(prevOutScript))
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toffset = 0
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var input = this.ins[inIndex]
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writeUInt32(this.version)
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writeSlice(hashPrevouts)
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writeSlice(hashSequence)
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writeSlice(input.hash)
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writeUInt32(input.index)
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writeVarSlice(prevOutScript)
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writeUInt64(value)
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writeUInt32(input.sequence)
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writeSlice(hashOutputs)
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writeUInt32(this.locktime)
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writeUInt32(hashType)
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return bcrypto.hash256(tbuffer)
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}
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Transaction.prototype.getHash = function () {
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return bcrypto.hash256(this.toBuffer())
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}
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Transaction.prototype.getId = function () {
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// transaction hash's are displayed in reverse order
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return bufferReverse(this.getHash()).toString('hex')
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}
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Transaction.prototype.toBuffer = function (buffer, initialOffset) {
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if (!buffer) buffer = new Buffer(this.byteLength())
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var offset = initialOffset || 0
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function writeSlice (slice) { offset += slice.copy(buffer, offset) }
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function writeUInt8 (i) { offset = buffer.writeUInt8(i, offset) }
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function writeUInt32 (i) { offset = buffer.writeUInt32LE(i, offset) }
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function writeInt32 (i) { offset = buffer.writeInt32LE(i, offset) }
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function writeUInt64 (i) { offset = bufferutils.writeUInt64LE(buffer, i, offset) }
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function writeVarInt (i) { offset += bufferutils.writeVarInt(buffer, i, offset) }
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function writeVarSlice (slice) { writeVarInt(slice.length); writeSlice(slice) }
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function writeVector (vector) { writeVarInt(vector.length); vector.forEach(writeVarSlice) }
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writeInt32(this.version)
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var hasWitnesses = this._hasWitnesses()
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if (hasWitnesses) {
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writeUInt8(Transaction.ADVANCED_TRANSACTION_MARKER)
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writeUInt8(Transaction.ADVANCED_TRANSACTION_FLAG)
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}
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writeVarInt(this.ins.length)
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this.ins.forEach(function (txIn) {
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writeSlice(txIn.hash)
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writeUInt32(txIn.index)
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writeVarSlice(txIn.script)
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writeUInt32(txIn.sequence)
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})
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writeVarInt(this.outs.length)
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this.outs.forEach(function (txOut) {
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if (!txOut.valueBuffer) {
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writeUInt64(txOut.value)
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} else {
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writeSlice(txOut.valueBuffer)
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}
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writeVarSlice(txOut.script)
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})
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if (hasWitnesses) {
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this.ins.forEach(function (input) {
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writeVector(input.witness)
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})
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}
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writeUInt32(this.locktime)
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// avoid slicing unless necessary
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if (initialOffset !== undefined) return buffer.slice(initialOffset, offset)
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return buffer
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}
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Transaction.prototype.toHex = function () {
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return this.toBuffer().toString('hex')
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}
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Transaction.prototype.setInputScript = function (index, scriptSig) {
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typeforce(types.tuple(types.Number, types.Buffer), arguments)
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this.ins[index].script = scriptSig
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}
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Transaction.prototype.setWitness = function (index, witness) {
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typeforce(types.tuple(types.Number, types.Buffer), arguments)
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this.ins[index].witness = witness
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}
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module.exports = Transaction
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