Add clone, addInputs, addOutputs

src/psbt.js

@@ -95,6 +95,12 @@ class Psbt extends bip174_1.Psbt {
   get inputCount() {
     return this.inputs.length;
   }
+  clone() {
+    // TODO: more efficient cloning
+    const res = Psbt.fromBuffer(this.toBuffer());
+    res.opts = JSON.parse(JSON.stringify(this.opts));
+    return res;
+  }
   setMaximumFeeRate(satoshiPerByte) {
     check32Bit(satoshiPerByte); // 42.9 BTC per byte IS excessive... so throw
     this.opts.maximumFeeRate = satoshiPerByte;
@@ -129,6 +135,10 @@ class Psbt extends bip174_1.Psbt {
     c.__EXTRACTED_TX = undefined;
     return this;
   }
+  addInputs(inputDatas) {
+    inputDatas.forEach(inputData => this.addInput(inputData));
+    return this;
+  }
   addInput(inputData) {
     checkInputsForPartialSig(this.inputs, 'addInput');
     const c = this.__CACHE;
@@ -138,6 +148,10 @@ class Psbt extends bip174_1.Psbt {
     c.__EXTRACTED_TX = undefined;
     return this;
   }
+  addOutputs(outputDatas) {
+    outputDatas.forEach(outputData => this.addOutput(outputData));
+    return this;
+  }
   addOutput(outputData) {
     checkInputsForPartialSig(this.inputs, 'addOutput');
     const { address } = outputData;

test/integration/transactions-psbt.js

@@ -1,17 +1,19 @@
-const { describe, it } = require('mocha')
+const { describe, it } = require('mocha');
-const assert = require('assert')
+const assert = require('assert');
-const bitcoin = require('../../')
+const bitcoin = require('../../');
-const regtestUtils = require('./_regtest')
+const regtestUtils = require('./_regtest');
-const regtest = regtestUtils.network
+const regtest = regtestUtils.network;
 
 // See bottom of file for some helper functions used to make the payment objects needed.
 
 describe('bitcoinjs-lib (transactions with psbt)', () => {
   it('can create a 1-to-1 Transaction', () => {
-    const alice = bitcoin.ECPair.fromWIF('L2uPYXe17xSTqbCjZvL2DsyXPCbXspvcu5mHLDYUgzdUbZGSKrSr')
+    const alice = bitcoin.ECPair.fromWIF(
-    const psbt = new bitcoin.Psbt()
+      'L2uPYXe17xSTqbCjZvL2DsyXPCbXspvcu5mHLDYUgzdUbZGSKrSr',
-    psbt.setVersion(2) // These are defaults. This line is not needed.
+    );
-    psbt.setLocktime(0) // These are defaults. This line is not needed.
+    const psbt = new bitcoin.Psbt();
+    psbt.setVersion(2); // These are defaults. This line is not needed.
+    psbt.setLocktime(0); // These are defaults. This line is not needed.
     psbt.addInput({
       // if hash is string, txid, if hash is Buffer, is reversed compared to txid
       hash: '7d067b4a697a09d2c3cff7d4d9506c9955e93bff41bf82d439da7d030382bc3e',
@@ -21,18 +23,18 @@ describe('bitcoinjs-lib (transactions with psbt)', () => {
       // non-segwit inputs now require passing the whole previous tx as Buffer
       nonWitnessUtxo: Buffer.from(
         '0200000001f9f34e95b9d5c8abcd20fc5bd4a825d1517be62f0f775e5f36da944d9' +
-        '452e550000000006b483045022100c86e9a111afc90f64b4904bd609e9eaed80d48' +
+          '452e550000000006b483045022100c86e9a111afc90f64b4904bd609e9eaed80d48' +
-        'ca17c162b1aca0a788ac3526f002207bb79b60d4fc6526329bf18a77135dc566020' +
+          'ca17c162b1aca0a788ac3526f002207bb79b60d4fc6526329bf18a77135dc566020' +
-        '9e761da46e1c2f1152ec013215801210211755115eabf846720f5cb18f248666fec' +
+          '9e761da46e1c2f1152ec013215801210211755115eabf846720f5cb18f248666fec' +
-        '631e5e1e66009ce3710ceea5b1ad13ffffffff01' +
+          '631e5e1e66009ce3710ceea5b1ad13ffffffff01' +
-        // value in satoshis (Int64LE) = 0x015f90 = 90000
+          // value in satoshis (Int64LE) = 0x015f90 = 90000
-        '905f010000000000' +
+          '905f010000000000' +
-        // scriptPubkey length
+          // scriptPubkey length
-        '19' +
+          '19' +
-        // scriptPubkey
+          // scriptPubkey
-        '76a9148bbc95d2709c71607c60ee3f097c1217482f518d88ac' +
+          '76a9148bbc95d2709c71607c60ee3f097c1217482f518d88ac' +
-        // locktime
+          // locktime
-        '00000000',
+          '00000000',
         'hex',
       ),
 
@@ -47,40 +49,50 @@ describe('bitcoinjs-lib (transactions with psbt)', () => {
       // },
 
       // Not featured here: redeemScript. A Buffer of the redeemScript
-    })
+    });
     psbt.addOutput({
       address: '1KRMKfeZcmosxALVYESdPNez1AP1mEtywp',
-      value: 80000
+      value: 80000,
-    })
+    });
-    psbt.signInput(0, alice)
+    psbt.signInput(0, alice);
-    psbt.validateSignatures(0)
+    psbt.validateSignatures(0);
-    psbt.finalizeAllInputs()
+    psbt.finalizeAllInputs();
     assert.strictEqual(
       psbt.extractTransaction().toHex(),
       '02000000013ebc8203037dda39d482bf41ff3be955996c50d9d4f7cfc3d2097a694a7' +
-      'b067d000000006b483045022100931b6db94aed25d5486884d83fc37160f37f3368c0' +
+        'b067d000000006b483045022100931b6db94aed25d5486884d83fc37160f37f3368c0' +
-      'd7f48c757112abefec983802205fda64cff98c849577026eb2ce916a50ea70626a766' +
+        'd7f48c757112abefec983802205fda64cff98c849577026eb2ce916a50ea70626a766' +
-      '9f8596dd89b720a26b4d501210365db9da3f8a260078a7e8f8b708a1161468fb2323f' +
+        '9f8596dd89b720a26b4d501210365db9da3f8a260078a7e8f8b708a1161468fb2323f' +
-      'fda5ec16b261ec1056f455ffffffff0180380100000000001976a914ca0d36044e0dc' +
+        'fda5ec16b261ec1056f455ffffffff0180380100000000001976a914ca0d36044e0dc' +
-      '08a22724efa6f6a07b0ec4c79aa88ac00000000',
+        '08a22724efa6f6a07b0ec4c79aa88ac00000000',
-    )
+    );
-  })
+  });
 
   it('can create (and broadcast via 3PBP) a typical Transaction', async () => {
     // these are { payment: Payment; keys: ECPair[] }
-    const alice1 = createPayment('p2pkh')
+    const alice1 = createPayment('p2pkh');
-    const alice2 = createPayment('p2pkh')
+    const alice2 = createPayment('p2pkh');
 
     // give Alice 2 unspent outputs
-    const inputData1 = await getInputData(5e4, alice1.payment, false, 'noredeem')
+    const inputData1 = await getInputData(
-    const inputData2 = await getInputData(7e4, alice2.payment, false, 'noredeem')
+      5e4,
+      alice1.payment,
+      false,
+      'noredeem',
+    );
+    const inputData2 = await getInputData(
+      7e4,
+      alice2.payment,
+      false,
+      'noredeem',
+    );
     {
       const {
         hash, // string of txid or Buffer of tx hash. (txid and hash are reverse order)
         index, // the output index of the txo you are spending
         nonWitnessUtxo, // the full previous transaction as a Buffer
-      } = inputData1
+      } = inputData1;
-      assert.deepStrictEqual({ hash, index, nonWitnessUtxo }, inputData1)
+      assert.deepStrictEqual({ hash, index, nonWitnessUtxo }, inputData1);
     }
 
     // network is only needed if you pass an address to addOutput
@@ -90,12 +102,12 @@ describe('bitcoinjs-lib (transactions with psbt)', () => {
       .addInput(inputData2) // alice2 unspent
       .addOutput({
         address: 'mwCwTceJvYV27KXBc3NJZys6CjsgsoeHmf',
-        value: 8e4
+        value: 8e4,
       }) // the actual "spend"
       .addOutput({
         address: alice2.payment.address, // OR script, which is a Buffer.
-        value: 1e4
+        value: 1e4,
-      }) // Alice's change
+      }); // Alice's change
     // (in)(5e4 + 7e4) - (out)(8e4 + 1e4) = (fee)3e4 = 30000, this is the miner fee
 
     // Let's show a new feature with PSBT.
@@ -103,231 +115,248 @@ describe('bitcoinjs-lib (transactions with psbt)', () => {
     // (this is not necessary, but a nice feature)
 
     // encode to send out to the signers
-    const psbtBaseText = psbt.toBase64()
+    const psbtBaseText = psbt.toBase64();
 
     // each signer imports
-    const signer1 = bitcoin.Psbt.fromBase64(psbtBaseText)
+    const signer1 = bitcoin.Psbt.fromBase64(psbtBaseText);
-    const signer2 = bitcoin.Psbt.fromBase64(psbtBaseText)
+    const signer2 = bitcoin.Psbt.fromBase64(psbtBaseText);
 
     // Alice signs each input with the respective private keys
     // signInput and signInputAsync are better
     // (They take the input index explicitly as the first arg)
-    signer1.sign(alice1.keys[0])
+    signer1.sign(alice1.keys[0]);
-    signer2.sign(alice2.keys[0])
+    signer2.sign(alice2.keys[0]);
 
     // If your signer object's sign method returns a promise, use the following
     // await signer2.signAsync(alice2.keys[0])
 
     // encode to send back to combiner (signer 1 and 2 are not near each other)
-    const s1text = signer1.toBase64()
+    const s1text = signer1.toBase64();
-    const s2text = signer2.toBase64()
+    const s2text = signer2.toBase64();
 
-    const final1 = bitcoin.Psbt.fromBase64(s1text)
+    const final1 = bitcoin.Psbt.fromBase64(s1text);
-    const final2 = bitcoin.Psbt.fromBase64(s2text)
+    const final2 = bitcoin.Psbt.fromBase64(s2text);
 
     // final1.combine(final2) would give the exact same result
-    psbt.combine(final1, final2)
+    psbt.combine(final1, final2);
 
     // Finalizer wants to check all signatures are valid before finalizing.
     // If the finalizer wants to check for specific pubkeys, the second arg
     // can be passed. See the first multisig example below.
-    assert.strictEqual(psbt.validateSignatures(0), true)
+    assert.strictEqual(psbt.validateSignatures(0), true);
-    assert.strictEqual(psbt.validateSignatures(1), true)
+    assert.strictEqual(psbt.validateSignatures(1), true);
 
     // This step it new. Since we separate the signing operation and
     // the creation of the scriptSig and witness stack, we are able to
-    psbt.finalizeAllInputs()
+    psbt.finalizeAllInputs();
     // it returns an array of the success of each input, also a result attribute
     // which is true if all array items are true.
 
     // build and broadcast our RegTest network
-    await regtestUtils.broadcast(psbt.extractTransaction().toHex())
+    await regtestUtils.broadcast(psbt.extractTransaction().toHex());
     // to build and broadcast to the actual Bitcoin network, see https://github.com/bitcoinjs/bitcoinjs-lib/issues/839
-  })
+  });
 
   it('can create (and broadcast via 3PBP) a Transaction with an OP_RETURN output', async () => {
-    const alice1 = createPayment('p2pkh')
+    const alice1 = createPayment('p2pkh');
-    const inputData1 = await getInputData(2e5, alice1.payment, false, 'noredeem')
+    const inputData1 = await getInputData(
+      2e5,
+      alice1.payment,
+      false,
+      'noredeem',
+    );
 
-    const data = Buffer.from('bitcoinjs-lib', 'utf8')
+    const data = Buffer.from('bitcoinjs-lib', 'utf8');
-    const embed = bitcoin.payments.embed({ data: [data] })
+    const embed = bitcoin.payments.embed({ data: [data] });
 
     const psbt = new bitcoin.Psbt({ network: regtest })
       .addInput(inputData1)
       .addOutput({
         script: embed.output,
-        value: 1000
+        value: 1000,
       })
       .addOutput({
         address: regtestUtils.RANDOM_ADDRESS,
-        value: 1e5
+        value: 1e5,
       })
-      .signInput(0, alice1.keys[0])
+      .signInput(0, alice1.keys[0]);
 
-    assert.strictEqual(psbt.validateSignatures(0), true)
+    assert.strictEqual(psbt.validateSignatures(0), true);
-    psbt.finalizeAllInputs()
+    psbt.finalizeAllInputs();
 
     // build and broadcast to the RegTest network
-    await regtestUtils.broadcast(psbt.extractTransaction().toHex())
+    await regtestUtils.broadcast(psbt.extractTransaction().toHex());
-  })
+  });
 
   it('can create (and broadcast via 3PBP) a Transaction, w/ a P2SH(P2MS(2 of 4)) (multisig) input', async () => {
-    const multisig = createPayment('p2sh-p2ms(2 of 4)')
+    const multisig = createPayment('p2sh-p2ms(2 of 4)');
-    const inputData1 = await getInputData(2e4, multisig.payment, false, 'p2sh')
+    const inputData1 = await getInputData(2e4, multisig.payment, false, 'p2sh');
     {
       const {
         hash,
         index,
         nonWitnessUtxo,
         redeemScript, // NEW: P2SH needs to give redeemScript when adding an input.
-      } = inputData1
+      } = inputData1;
-      assert.deepStrictEqual({ hash, index, nonWitnessUtxo, redeemScript }, inputData1)
+      assert.deepStrictEqual(
+        { hash, index, nonWitnessUtxo, redeemScript },
+        inputData1,
+      );
     }
 
     const psbt = new bitcoin.Psbt({ network: regtest })
       .addInput(inputData1)
       .addOutput({
         address: regtestUtils.RANDOM_ADDRESS,
-        value: 1e4
+        value: 1e4,
       })
       .signInput(0, multisig.keys[0])
-      .signInput(0, multisig.keys[2])
+      .signInput(0, multisig.keys[2]);
 
-    assert.strictEqual(psbt.validateSignatures(0), true)
+    assert.strictEqual(psbt.validateSignatures(0), true);
-    assert.strictEqual(psbt.validateSignatures(0, multisig.keys[0].publicKey), true)
+    assert.strictEqual(
+      psbt.validateSignatures(0, multisig.keys[0].publicKey),
+      true,
+    );
     assert.throws(() => {
-      psbt.validateSignatures(0, multisig.keys[3].publicKey)
+      psbt.validateSignatures(0, multisig.keys[3].publicKey);
-    }, new RegExp('No signatures for this pubkey'))
+    }, new RegExp('No signatures for this pubkey'));
-    psbt.finalizeAllInputs()
+    psbt.finalizeAllInputs();
 
-    const tx = psbt.extractTransaction()
+    const tx = psbt.extractTransaction();
 
     // build and broadcast to the Bitcoin RegTest network
-    await regtestUtils.broadcast(tx.toHex())
+    await regtestUtils.broadcast(tx.toHex());
 
     await regtestUtils.verify({
       txId: tx.getId(),
       address: regtestUtils.RANDOM_ADDRESS,
       vout: 0,
-      value: 1e4
+      value: 1e4,
-    })
+    });
-  })
+  });
 
   it('can create (and broadcast via 3PBP) a Transaction, w/ a P2SH(P2WPKH) input', async () => {
-    const p2sh = createPayment('p2sh-p2wpkh')
+    const p2sh = createPayment('p2sh-p2wpkh');
-    const inputData = await getInputData(5e4, p2sh.payment, true, 'p2sh')
+    const inputData = await getInputData(5e4, p2sh.payment, true, 'p2sh');
+    const inputData2 = await getInputData(5e4, p2sh.payment, true, 'p2sh');
     {
       const {
         hash,
         index,
         witnessUtxo, // NEW: this is an object of the output being spent { script: Buffer; value: Satoshis; }
         redeemScript,
-      } = inputData
+      } = inputData;
-      assert.deepStrictEqual({ hash, index, witnessUtxo, redeemScript }, inputData)
+      assert.deepStrictEqual(
+        { hash, index, witnessUtxo, redeemScript },
+        inputData,
+      );
     }
-    const keyPair = p2sh.keys[0]
+    const keyPair = p2sh.keys[0];
     const outputData = {
       script: p2sh.payment.output, // sending to myself for fun
-      value: 2e4
+      value: 2e4,
-    }
+    };
+    const outputData2 = {
+      script: p2sh.payment.output, // sending to myself for fun
+      value: 7e4,
+    };
 
     const tx = new bitcoin.Psbt()
-      .addInput(inputData)
+      .addInputs([inputData, inputData2])
-      .addOutput(outputData)
+      .addOutputs([outputData, outputData2])
       .sign(keyPair)
       .finalizeAllInputs()
-      .extractTransaction()
+      .extractTransaction();
 
     // build and broadcast to the Bitcoin RegTest network
-    await regtestUtils.broadcast(tx.toHex())
+    await regtestUtils.broadcast(tx.toHex());
 
     await regtestUtils.verify({
       txId: tx.getId(),
       address: p2sh.payment.address,
       vout: 0,
-      value: 2e4
+      value: 2e4,
-    })
+    });
-  })
+  });
 
   it('can create (and broadcast via 3PBP) a Transaction, w/ a P2WPKH input', async () => {
-
     // the only thing that changes is you don't give a redeemscript for input data
 
-    const p2wpkh = createPayment('p2wpkh')
+    const p2wpkh = createPayment('p2wpkh');
-    const inputData = await getInputData(5e4, p2wpkh.payment, true, 'noredeem')
+    const inputData = await getInputData(5e4, p2wpkh.payment, true, 'noredeem');
     {
-      const {
+      const { hash, index, witnessUtxo } = inputData;
-        hash,
+      assert.deepStrictEqual({ hash, index, witnessUtxo }, inputData);
-        index,
-        witnessUtxo,
-      } = inputData
-      assert.deepStrictEqual({ hash, index, witnessUtxo }, inputData)
     }
 
     const psbt = new bitcoin.Psbt({ network: regtest })
       .addInput(inputData)
       .addOutput({
         address: regtestUtils.RANDOM_ADDRESS,
-        value: 2e4
+        value: 2e4,
       })
-      .signInput(0, p2wpkh.keys[0])
+      .signInput(0, p2wpkh.keys[0]);
 
-    assert.strictEqual(psbt.validateSignatures(0), true)
+    assert.strictEqual(psbt.validateSignatures(0), true);
-    psbt.finalizeAllInputs()
+    psbt.finalizeAllInputs();
 
-    const tx = psbt.extractTransaction()
+    const tx = psbt.extractTransaction();
 
     // build and broadcast to the Bitcoin RegTest network
-    await regtestUtils.broadcast(tx.toHex())
+    await regtestUtils.broadcast(tx.toHex());
 
     await regtestUtils.verify({
       txId: tx.getId(),
       address: regtestUtils.RANDOM_ADDRESS,
       vout: 0,
-      value: 2e4
+      value: 2e4,
-    })
+    });
-  })
+  });
 
   it('can create (and broadcast via 3PBP) a Transaction, w/ a P2WSH(P2PK) input', async () => {
-    const p2wsh = createPayment('p2wsh-p2pk')
+    const p2wsh = createPayment('p2wsh-p2pk');
-    const inputData = await getInputData(5e4, p2wsh.payment, true, 'p2wsh')
+    const inputData = await getInputData(5e4, p2wsh.payment, true, 'p2wsh');
     {
       const {
         hash,
         index,
         witnessUtxo,
         witnessScript, // NEW: A Buffer of the witnessScript
-      } = inputData
+      } = inputData;
-      assert.deepStrictEqual({ hash, index, witnessUtxo, witnessScript }, inputData)
+      assert.deepStrictEqual(
+        { hash, index, witnessUtxo, witnessScript },
+        inputData,
+      );
     }
 
     const psbt = new bitcoin.Psbt({ network: regtest })
       .addInput(inputData)
       .addOutput({
         address: regtestUtils.RANDOM_ADDRESS,
-        value: 2e4
+        value: 2e4,
       })
-      .signInput(0, p2wsh.keys[0])
+      .signInput(0, p2wsh.keys[0]);
 
-    assert.strictEqual(psbt.validateSignatures(0), true)
+    assert.strictEqual(psbt.validateSignatures(0), true);
-    psbt.finalizeAllInputs()
+    psbt.finalizeAllInputs();
 
-    const tx = psbt.extractTransaction()
+    const tx = psbt.extractTransaction();
 
     // build and broadcast to the Bitcoin RegTest network
-    await regtestUtils.broadcast(tx.toHex())
+    await regtestUtils.broadcast(tx.toHex());
 
     await regtestUtils.verify({
       txId: tx.getId(),
       address: regtestUtils.RANDOM_ADDRESS,
       vout: 0,
-      value: 2e4
+      value: 2e4,
-    })
+    });
-  })
+  });
 
   it('can create (and broadcast via 3PBP) a Transaction, w/ a P2SH(P2WSH(P2MS(3 of 4))) (SegWit multisig) input', async () => {
-    const p2sh = createPayment('p2sh-p2wsh-p2ms(3 of 4)')
+    const p2sh = createPayment('p2sh-p2wsh-p2ms(3 of 4)');
-    const inputData = await getInputData(5e4, p2sh.payment, true, 'p2sh-p2wsh')
+    const inputData = await getInputData(5e4, p2sh.payment, true, 'p2sh-p2wsh');
     {
       const {
         hash,
@@ -335,54 +364,60 @@ describe('bitcoinjs-lib (transactions with psbt)', () => {
         witnessUtxo,
         redeemScript,
         witnessScript,
-      } = inputData
+      } = inputData;
-      assert.deepStrictEqual({ hash, index, witnessUtxo, redeemScript, witnessScript }, inputData)
+      assert.deepStrictEqual(
+        { hash, index, witnessUtxo, redeemScript, witnessScript },
+        inputData,
+      );
     }
 
     const psbt = new bitcoin.Psbt({ network: regtest })
       .addInput(inputData)
       .addOutput({
         address: regtestUtils.RANDOM_ADDRESS,
-        value: 2e4
+        value: 2e4,
       })
       .signInput(0, p2sh.keys[0])
       .signInput(0, p2sh.keys[2])
-      .signInput(0, p2sh.keys[3])
+      .signInput(0, p2sh.keys[3]);
 
-    assert.strictEqual(psbt.validateSignatures(0), true)
+    assert.strictEqual(psbt.validateSignatures(0), true);
-    assert.strictEqual(psbt.validateSignatures(0, p2sh.keys[3].publicKey), true)
+    assert.strictEqual(
+      psbt.validateSignatures(0, p2sh.keys[3].publicKey),
+      true,
+    );
     assert.throws(() => {
-      psbt.validateSignatures(0, p2sh.keys[1].publicKey)
+      psbt.validateSignatures(0, p2sh.keys[1].publicKey);
-    }, new RegExp('No signatures for this pubkey'))
+    }, new RegExp('No signatures for this pubkey'));
-    psbt.finalizeAllInputs()
+    psbt.finalizeAllInputs();
 
-    const tx = psbt.extractTransaction()
+    const tx = psbt.extractTransaction();
 
     // build and broadcast to the Bitcoin RegTest network
-    await regtestUtils.broadcast(tx.toHex())
+    await regtestUtils.broadcast(tx.toHex());
 
     await regtestUtils.verify({
       txId: tx.getId(),
       address: regtestUtils.RANDOM_ADDRESS,
       vout: 0,
-      value: 2e4
+      value: 2e4,
-    })
+    });
-  })
+  });
-})
+});
 
 function createPayment(_type, network) {
-  network = network || regtest
+  network = network || regtest;
   const splitType = _type.split('-').reverse();
   const isMultisig = splitType[0].slice(0, 4) === 'p2ms';
   const keys = [];
   let m;
   if (isMultisig) {
-    const match = splitType[0].match(/^p2ms\((\d+) of (\d+)\)$/)
+    const match = splitType[0].match(/^p2ms\((\d+) of (\d+)\)$/);
-    m = parseInt(match[1])
+    m = parseInt(match[1]);
-    let n = parseInt(match[2])
+    let n = parseInt(match[2]);
     while (n > 1) {
       keys.push(bitcoin.ECPair.makeRandom({ network }));
-      n--
+      n--;
     }
   }
   keys.push(bitcoin.ECPair.makeRandom({ network }));

ts_src/psbt.ts

@@ -130,6 +130,13 @@ export class Psbt extends PsbtBase {
     return this.inputs.length;
   }
 
+  clone(): Psbt {
+    // TODO: more efficient cloning
+    const res = Psbt.fromBuffer(this.toBuffer());
+    res.opts = JSON.parse(JSON.stringify(this.opts));
+    return res;
+  }
+
   setMaximumFeeRate(satoshiPerByte: number): void {
     check32Bit(satoshiPerByte); // 42.9 BTC per byte IS excessive... so throw
     this.opts.maximumFeeRate = satoshiPerByte;
@@ -168,6 +175,11 @@ export class Psbt extends PsbtBase {
     return this;
   }
 
+  addInputs(inputDatas: TransactionInput[]): this {
+    inputDatas.forEach(inputData => this.addInput(inputData));
+    return this;
+  }
+
   addInput(inputData: TransactionInput): this {
     checkInputsForPartialSig(this.inputs, 'addInput');
     const c = this.__CACHE;
@@ -178,6 +190,11 @@ export class Psbt extends PsbtBase {
     return this;
   }
 
+  addOutputs(outputDatas: TransactionOutput[]): this {
+    outputDatas.forEach(outputData => this.addOutput(outputData));
+    return this;
+  }
+
   addOutput(outputData: TransactionOutput): this {
     checkInputsForPartialSig(this.inputs, 'addOutput');
     const { address } = outputData as any;

types/psbt.d.ts

@@ -11,11 +11,14 @@ export declare class Psbt extends PsbtBase {
     private opts;
     constructor(opts?: PsbtOptsOptional);
     readonly inputCount: number;
+    clone(): Psbt;
     setMaximumFeeRate(satoshiPerByte: number): void;
     setVersion(version: number): this;
     setLocktime(locktime: number): this;
     setSequence(inputIndex: number, sequence: number): this;
+    addInputs(inputDatas: TransactionInput[]): this;
     addInput(inputData: TransactionInput): this;
+    addOutputs(outputDatas: TransactionOutput[]): this;
     addOutput(outputData: TransactionOutput): this;
     addNonWitnessUtxoToInput(inputIndex: number, nonWitnessUtxo: NonWitnessUtxo): this;
     extractTransaction(disableFeeCheck?: boolean): Transaction;