@leather.io/bitcoin - npm Package Compare versions

Comparing version 0.37.0 to 0.37.1

.turbo/turbo-build.log

 
-> @leather.io/bitcoin@0.37.0 build /home/runner/work/mono/mono/packages/bitcoin
+> @leather.io/bitcoin@0.37.1 build /home/runner/work/mono/mono/packages/bitcoin
 > tsdown
@@ -10,7 +10,7 @@
 ℹ Build start
-ℹ dist/index.js         58.22 kB │ gzip: 13.64 kB
-ℹ dist/index.js.map    117.82 kB │ gzip: 27.59 kB
-ℹ dist/index.d.ts.map   11.64 kB │ gzip:  4.75 kB
-ℹ dist/index.d.ts       33.53 kB │ gzip:  6.95 kB
-ℹ 4 files, total: 221.21 kB
-✔ Build complete in 4423ms
+ℹ dist/index.js         58.24 kB │ gzip: 13.65 kB
+ℹ dist/index.js.map    117.86 kB │ gzip: 27.60 kB
+ℹ dist/index.d.ts.map   11.65 kB │ gzip:  4.75 kB
+ℹ dist/index.d.ts       33.54 kB │ gzip:  6.96 kB
+ℹ 4 files, total: 221.29 kB
+✔ Build complete in 4248ms

dist/index.d.ts

@@ -143,3 +143,4 @@ import { Bip21Options } from "bip21";
   feeRate,
-  recipients
+  recipients,
+  isSendMax
 }: GetSpendableAmountArgs<T>): {
@@ -492,5 +493,5 @@ spendableAmount: BigNumber;
 declare const paymentTypeMap: Record<BtcSignerLibPaymentTypeIdentifers, BitcoinPaymentTypes>;
-declare function btcSignerLibPaymentTypeToPaymentTypeMap(payment: BtcSignerLibPaymentTypeIdentifers): "p2wpkh" | "p2tr" | "p2pkh" | "p2sh" | "p2wpkh-p2sh";
+declare function btcSignerLibPaymentTypeToPaymentTypeMap(payment: BtcSignerLibPaymentTypeIdentifers): "p2pkh" | "p2sh" | "p2wpkh-p2sh" | "p2wpkh" | "p2tr";
 declare function isBtcSignerLibPaymentType(payment: string): payment is BtcSignerLibPaymentTypeIdentifers;
-declare function parseKnownPaymentType(payment: BtcSignerLibPaymentTypeIdentifers | BitcoinPaymentTypes): "p2wpkh" | "p2tr" | "p2pkh" | "p2sh" | "p2wpkh-p2sh";
+declare function parseKnownPaymentType(payment: BtcSignerLibPaymentTypeIdentifers | BitcoinPaymentTypes): "p2pkh" | "p2sh" | "p2wpkh-p2sh" | "p2wpkh" | "p2tr";
 type PaymentTypeMap<T> = Record<BitcoinPaymentTypes, T>;
@@ -497,0 +498,0 @@ declare function whenPaymentType(mode: BitcoinPaymentTypes | BtcSignerLibPaymentTypeIdentifers): <T>(paymentMap: PaymentTypeMap<T>) => T;

dist/index.d.ts.map

@@ -1,1 +0,1 @@
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dist/index.js

@@ -769,7 +769,8 @@ import { decode, encode } from "bip21";
 }
-function getSpendableAmount({ utxos, feeRate, recipients }) {
+function getSpendableAmount({ utxos, feeRate, recipients, isSendMax }) {
 	const balance = utxos.map((utxo) => utxo.value).reduce((prevVal, curVal) => prevVal + curVal, 0);
 	const size = getSizeInfo({
 		utxos,
-		recipients
+		recipients,
+		isSendMax
 	});
@@ -776,0 +777,0 @@ const fee = Math.ceil(size.txVBytes * feeRate);

package.json

@@ -5,3 +5,3 @@ {
   "description": "Shared bitcoin utilities",
-  "version": "0.37.0",
+  "version": "0.37.1",
   "license": "MIT",
@@ -36,6 +36,6 @@ "homepage": "https://github.com/leather.io/mono/tree/dev/packages/bitcoin",
     "zod": "4.0.17",
-    "@leather.io/crypto": "1.12.17",
+    "@leather.io/crypto": "1.12.18",
+    "@leather.io/constants": "0.33.0",
     "@leather.io/models": "0.54.0",
-    "@leather.io/utils": "0.50.0",
-    "@leather.io/constants": "0.32.0"
+    "@leather.io/utils": "0.50.1"
   },
@@ -48,6 +48,6 @@ "devDependencies": {
     "vitest": "2.1.9",
-    "@leather.io/test-config": "0.1.3",
-    "@leather.io/rpc": "2.21.11",
+    "@leather.io/prettier-config": "0.9.0",
+    "@leather.io/rpc": "2.21.12",
     "@leather.io/tsconfig-config": "0.11.1",
-    "@leather.io/prettier-config": "0.9.0"
+    "@leather.io/test-config": "0.1.3"
   },
@@ -54,0 +54,0 @@ "keywords": [

src/coin-selection/calculate-max-spend.spec.ts

@@ -0,7 +1,18 @@
+import { createMoney } from '@leather.io/utils';
+
+import { recipientAddress, taprootAddress } from '../mocks/mocks';
 import { createBitcoinAddress } from '../validation/bitcoin-address';
 import { calculateMaxSpend } from './calculate-max-spend';
-import { mockUtxos } from './coin-selection.mocks';
+import { mockTaprootUtxos, mockUtxos } from './coin-selection.mocks';
+import { getSizeInfo } from './coin-selection.utils';
 
 const recipient = createBitcoinAddress('');
 describe(calculateMaxSpend.name, () => {
+  test('that empty utxos returns zero', () => {
+    const result = calculateMaxSpend({ recipient: recipientAddress, utxos: [], feeRate: 1 });
+    expect(result.spendAllFee).toEqual(0);
+    expect(result.amount.amount.toNumber()).toEqual(0);
+    expect(result.spendableBitcoin.toNumber()).toEqual(0);
+  });
+
   test('with 1 sat/vb fee', () => {
@@ -13,3 +24,4 @@ const maxBitcoinSpend = calculateMaxSpend({
     });
-    expect(maxBitcoinSpend.amount.amount.toNumber()).toEqual(50087948);
+    expect(maxBitcoinSpend.amount.amount.toNumber()).toEqual(50087979);
+    expect(maxBitcoinSpend.spendAllFee).toEqual(621);
   });
@@ -23,3 +35,4 @@
     });
-    expect(maxBitcoinSpend.amount.amount.toNumber()).toEqual(50085342);
+    expect(maxBitcoinSpend.amount.amount.toNumber()).toEqual(50085497);
+    expect(maxBitcoinSpend.spendAllFee).toEqual(3103);
   });
@@ -33,3 +46,4 @@
     });
-    expect(maxBitcoinSpend.amount.amount.toNumber()).toEqual(50073585);
+    expect(maxBitcoinSpend.amount.amount.toNumber()).toEqual(50074515);
+    expect(maxBitcoinSpend.spendAllFee).toEqual(10485);
   });
@@ -43,3 +57,4 @@
     });
-    expect(maxBitcoinSpend.amount.amount.toNumber()).toEqual(50046950);
+    expect(maxBitcoinSpend.amount.amount.toNumber()).toEqual(50050050);
+    expect(maxBitcoinSpend.spendAllFee).toEqual(34950);
   });
@@ -53,4 +68,108 @@
     });
-    expect(maxBitcoinSpend.amount.amount.toNumber()).toEqual(49969100);
+    expect(maxBitcoinSpend.amount.amount.toNumber()).toEqual(49981500);
+    expect(maxBitcoinSpend.spendAllFee).toEqual(58500);
   });
+
+  describe('with taproot UTXOs', () => {
+    const taprootRecipient = recipientAddress;
+
+    test('with 1 sat/vb fee', () => {
+      const result = calculateMaxSpend({
+        recipient: taprootRecipient,
+        utxos: mockTaprootUtxos,
+        feeRate: 1,
+      });
+      expect(result.amount.amount.toNumber()).toEqual(50088043);
+      expect(result.spendAllFee).toEqual(557);
+      expect(result.spendableBitcoin.toNumber()).toEqual(0.50088043);
+    });
+
+    test('with 5 sat/vb fee', () => {
+      const result = calculateMaxSpend({
+        recipient: taprootRecipient,
+        utxos: mockTaprootUtxos,
+        feeRate: 5,
+      });
+      expect(result.amount.amount.toNumber()).toEqual(50085815);
+      expect(result.spendAllFee).toEqual(2785);
+    });
+
+    test('with 30 sat/vb fee', () => {
+      const result = calculateMaxSpend({
+        recipient: taprootRecipient,
+        utxos: mockTaprootUtxos,
+        feeRate: 30,
+      });
+      expect(result.amount.amount.toNumber()).toEqual(50075160);
+      expect(result.spendAllFee).toEqual(9840);
+    });
+
+    test('with 100 sat/vb fee', () => {
+      const result = calculateMaxSpend({
+        recipient: taprootRecipient,
+        utxos: mockTaprootUtxos,
+        feeRate: 100,
+      });
+      expect(result.amount.amount.toNumber()).toEqual(50052200);
+      expect(result.spendAllFee).toEqual(32800);
+    });
+
+    test('with 400 sat/vb fee', () => {
+      const result = calculateMaxSpend({
+        recipient: taprootRecipient,
+        utxos: mockTaprootUtxos,
+        feeRate: 400,
+      });
+      expect(result.amount.amount.toNumber()).toEqual(49979600);
+      expect(result.spendAllFee).toEqual(85400);
+    });
+
+    test('taproot inputs have lower fees than native segwit at same fee rate', () => {
+      const segwitResult = calculateMaxSpend({
+        recipient: taprootRecipient,
+        utxos: mockUtxos,
+        feeRate: 30,
+      });
+      const taprootResult = calculateMaxSpend({
+        recipient: taprootRecipient,
+        utxos: mockTaprootUtxos,
+        feeRate: 30,
+      });
+      expect(taprootResult.spendAllFee).toBeLessThan(segwitResult.spendAllFee);
+    });
+  });
+
+  test('send-max fee should not include a change output', () => {
+    const feeRate = 10;
+    const utxos = mockTaprootUtxos;
+
+    const result = calculateMaxSpend({ recipient: recipientAddress, utxos, feeRate });
+
+    const correctSize = getSizeInfo({
+      utxos,
+      recipients: [{ address: recipientAddress, amount: createMoney(0, 'BTC') }],
+      isSendMax: true,
+    });
+    const correctFee = Math.ceil(correctSize.txVBytes * feeRate);
+
+    expect(result.spendAllFee).toEqual(correctFee);
+  });
+
+  describe('with taproot recipient', () => {
+    test('P2TR output costs more than P2WPKH output', () => {
+      const segwitRecipientResult = calculateMaxSpend({
+        recipient: recipientAddress,
+        utxos: mockUtxos,
+        feeRate: 30,
+      });
+      const taprootRecipientResult = calculateMaxSpend({
+        recipient: taprootAddress,
+        utxos: mockUtxos,
+        feeRate: 30,
+      });
+      expect(segwitRecipientResult.amount.amount.toNumber()).toEqual(50073585);
+      expect(taprootRecipientResult.amount.amount.toNumber()).toEqual(50073225);
+      expect(taprootRecipientResult.spendAllFee).toBeGreaterThan(segwitRecipientResult.spendAllFee);
+    });
+  });
 });

src/coin-selection/coin-selection.spec.ts

@@ -243,2 +243,25 @@ import { BTC_P2WPKH_DUST_AMOUNT } from '@leather.io/constants';
   });
+
+  test('that spending all taproot utxos with sendMax produces lower fee than native segwit', () => {
+    const taprootUtxos = generateMockTaprootTransactions([1000, 2000, 3000]);
+    const segwitUtxos = generateMockTransactions([1000, 2000, 3000]);
+    const feeRate = 2;
+
+    const taprootResult = determineUtxosForSpendAll({
+      utxos: taprootUtxos,
+      recipients: [{ address: recipientAddress, amount: createMoney(5000, 'BTC') }],
+      feeRate,
+    });
+    const segwitResult = determineUtxosForSpendAll({
+      utxos: segwitUtxos,
+      recipients: [{ address: recipientAddress, amount: createMoney(5000, 'BTC') }],
+      feeRate,
+    });
+
+    expect(taprootResult.inputs.length).toEqual(3);
+    expect(taprootResult.outputs.length).toEqual(1);
+    expect(taprootResult.fee.amount.isLessThan(segwitResult.fee.amount)).toBeTruthy();
+    expect(taprootResult.size).toBeGreaterThan(200);
+    expect(taprootResult.size).toBeLessThan(220);
+  });
 });
@@ -285,2 +308,55 @@
   });
+
+  test('that spending all mixed P2WPKH + P2TR utxos includes inputs from both address types', () => {
+    const nativeSegwitUtxos = generateMockTransactions([2000, 3000]);
+    const taprootUtxos = generateMockTaprootTransactions([2000, 3000]);
+    const allTaprootUtxos = generateMockTaprootTransactions([2000, 3000, 2000, 3000]);
+    const mixedUtxos = [...nativeSegwitUtxos, ...taprootUtxos];
+    const feeRate = 4;
+
+    const mixedResult = determineUtxosForSpendAll({
+      utxos: mixedUtxos,
+      recipients: [{ address: recipientAddress, amount: createMoney(8000, 'BTC') }],
+      feeRate,
+    });
+    const allTaprootResult = determineUtxosForSpendAll({
+      utxos: allTaprootUtxos,
+      recipients: [{ address: recipientAddress, amount: createMoney(8000, 'BTC') }],
+      feeRate,
+    });
+
+    expect(mixedResult.inputs.length).toEqual(4);
+    expect(mixedResult.outputs.length).toEqual(1);
+
+    const hasSegwit = mixedResult.inputs.some(u => u.address.startsWith('tb1q'));
+    const hasTaproot = mixedResult.inputs.some(u => u.address.startsWith('tb1p'));
+    expect(hasSegwit).toBeTruthy();
+    expect(hasTaproot).toBeTruthy();
+
+    expect(mixedResult.size).toBeGreaterThan(280);
+    expect(mixedResult.size).toBeLessThan(300);
+    expect(mixedResult.fee.amount.isGreaterThan(allTaprootResult.fee.amount)).toBeTruthy();
+  });
+
+  test('that mixed P2WPKH + P2TR inputs are sorted by value descending', () => {
+    const nativeSegwitUtxos = generateMockTransactions([15_000, 40_000]);
+    const taprootUtxos = generateMockTaprootTransactions([25_000, 30_000]);
+    const utxos = [...nativeSegwitUtxos, ...taprootUtxos];
+
+    const result = determineUtxosForSpend({
+      utxos,
+      recipients: [
+        {
+          address: recipientAddress,
+          amount: createMoney(50_000, 'BTC'),
+        },
+      ],
+      feeRate: 20,
+    });
+    result.inputs.forEach((input, i) => {
+      const nextInput = result.inputs[i + 1];
+      if (!nextInput) return;
+      expect(input.value >= nextInput.value).toEqual(true);
+    });
+  });
 });

src/coin-selection/coin-selection.utils.spec.ts

 import { createMoney } from '@leather.io/utils';
 
 import { recipientAddress } from '../mocks/mocks';
-import { mockUtxos } from './coin-selection.mocks';
-import { filterUneconomicalUtxos } from './coin-selection.utils';
+import {
+  generateMockTaprootTransactions,
+  generateMockTransactions,
+  mockTaprootUtxos,
+  mockUtxos,
+} from './coin-selection.mocks';
+import {
+  countInputsByScriptType,
+  filterUneconomicalUtxos,
+  getSpendableAmount,
+} from './coin-selection.utils';
 
@@ -65,2 +74,104 @@ describe(filterUneconomicalUtxos.name, () => {
   });
+
+  describe('with taproot utxos', () => {
+    test('that every surviving taproot utxo increases spendable amount', () => {
+      const feeRate = 200;
+      const survivors = filterUneconomicalUtxos({
+        utxos: mockTaprootUtxos,
+        feeRate,
+        recipients,
+      });
+
+      const { spendableAmount: fullAmount } = getSpendableAmount({
+        utxos: mockTaprootUtxos,
+        feeRate,
+        recipients,
+      });
+
+      for (const utxo of survivors) {
+        const { spendableAmount: withoutUtxo } = getSpendableAmount({
+          utxos: mockTaprootUtxos.filter(u => u.txid !== utxo.txid),
+          feeRate,
+          recipients,
+        });
+        expect(fullAmount.toNumber()).toBeGreaterThan(withoutUtxo.toNumber());
+      }
+    });
+
+    test('that every filtered taproot utxo does not increase spendable amount', () => {
+      const feeRate = 200;
+      const survivors = filterUneconomicalUtxos({
+        utxos: mockTaprootUtxos,
+        feeRate,
+        recipients,
+      });
+      const filtered = mockTaprootUtxos.filter(u => !survivors.some(s => s.txid === u.txid));
+
+      expect(filtered.length).toBeGreaterThan(0);
+
+      const { spendableAmount: fullAmount } = getSpendableAmount({
+        utxos: mockTaprootUtxos,
+        feeRate,
+        recipients,
+      });
+
+      for (const utxo of filtered) {
+        const { spendableAmount: withoutUtxo } = getSpendableAmount({
+          utxos: mockTaprootUtxos.filter(u => u.txid !== utxo.txid),
+          feeRate,
+          recipients,
+        });
+        expect(withoutUtxo.toNumber()).toBeGreaterThanOrEqual(fullAmount.toNumber());
+      }
+    });
+
+    test('that taproot inputs are cheaper so more survive than native segwit', () => {
+      const feeRate = 10;
+      const segwitResult = filterUneconomicalUtxos({
+        utxos: mockUtxos,
+        feeRate,
+        recipients,
+      });
+      const taprootResult = filterUneconomicalUtxos({
+        utxos: mockTaprootUtxos,
+        feeRate,
+        recipients,
+      });
+
+      expect(taprootResult.length).toBeGreaterThan(segwitResult.length);
+    });
+
+    test('that taproot utxo below dust threshold is filtered even at low fee rate', () => {
+      const utxosWithDust = generateMockTaprootTransactions([200, 50000000]);
+      const result = filterUneconomicalUtxos({
+        utxos: utxosWithDust,
+        feeRate: 1,
+        recipients,
+      });
+
+      expect(result.length).toEqual(1);
+      expect(result[0].value).toEqual(50000000);
+    });
+  });
 });
+
+describe(countInputsByScriptType.name, () => {
+  test('all native segwit utxos', () => {
+    const result = countInputsByScriptType(mockUtxos);
+    expect(result).toEqual({ p2wpkh: 9, p2tr: 0 });
+  });
+
+  test('all taproot utxos', () => {
+    const result = countInputsByScriptType(mockTaprootUtxos);
+    expect(result).toEqual({ p2wpkh: 0, p2tr: 9 });
+  });
+
+  test('mixed utxos', () => {
+    const mixed = [
+      ...generateMockTransactions([1000, 2000]),
+      ...generateMockTaprootTransactions([3000, 4000, 5000]),
+    ];
+    const result = countInputsByScriptType(mixed);
+    expect(result).toEqual({ p2wpkh: 2, p2tr: 3 });
+  });
+});

src/coin-selection/coin-selection.utils.ts

@@ -98,2 +98,3 @@ import BigNumber from 'bignumber.js';
   recipients,
+  isSendMax,
 }: GetSpendableAmountArgs<T>) {
@@ -105,2 +106,3 @@ const balance = utxos.map(utxo => utxo.value).reduce((prevVal, curVal) => prevVal + curVal, 0);
     recipients,
+    isSendMax,
   });
@@ -107,0 +109,0 @@ const fee = Math.ceil(size.txVBytes * feeRate);

src/fees/bitcoin-fees.spec.ts

@@ -7,3 +7,3 @@ import BigNumber from 'bignumber.js';
 import { CoinSelectionRecipient } from '../coin-selection/coin-selection';
-import { recipientAddress } from '../mocks/mocks';
+import { recipientAddress, taprootAddress } from '../mocks/mocks';
 import { getBitcoinFees, getBitcoinTransactionFee } from './bitcoin-fees';
@@ -60,2 +60,70 @@
 
+describe('getBitcoinTransactionFee with taproot', () => {
+  const mockTxid = '8192e8e20088c5f052fc7351b86b8f60a9454937860b281227e53e19f3e9c3f6';
+  const defaultRecipients = [{ address: recipientAddress, amount: createMoney(1000, 'BTC') }];
+
+  it('should return a lower fee for a taproot UTXO than native segwit', () => {
+    const segwitFee = getBitcoinTransactionFee({
+      recipients: defaultRecipients,
+      utxos: [{ address: recipientAddress, txid: mockTxid, value: 2000 }],
+      feeRate: 1,
+    });
+    const taprootFee = getBitcoinTransactionFee({
+      recipients: defaultRecipients,
+      utxos: [{ address: taprootAddress, txid: mockTxid, value: 2000 }],
+      feeRate: 1,
+    });
+
+    expect(segwitFee).not.toBeNull();
+    expect(taprootFee).not.toBeNull();
+    expect(taprootFee!.amount.toNumber()).toBeLessThan(segwitFee!.amount.toNumber());
+  });
+
+  it('should return a lower fee for taproot max send than native segwit', () => {
+    const maxSendRecipients = [{ address: recipientAddress, amount: createMoney(2000, 'BTC') }];
+
+    const segwitFee = getBitcoinTransactionFee({
+      isSendingMax: true,
+      recipients: maxSendRecipients,
+      utxos: [{ address: recipientAddress, txid: mockTxid, value: 2000 }],
+      feeRate: 2,
+    });
+    const taprootFee = getBitcoinTransactionFee({
+      isSendingMax: true,
+      recipients: maxSendRecipients,
+      utxos: [{ address: taprootAddress, txid: mockTxid, value: 2000 }],
+      feeRate: 2,
+    });
+
+    expect(segwitFee).not.toBeNull();
+    expect(taprootFee).not.toBeNull();
+    expect(taprootFee!.amount.toNumber()).toBeLessThan(segwitFee!.amount.toNumber());
+  });
+
+  it('should return a lower fee for mixed UTXOs than all native segwit', () => {
+    const mixedRecipients = [{ address: recipientAddress, amount: createMoney(15000, 'BTC') }];
+
+    const allSegwitFee = getBitcoinTransactionFee({
+      recipients: mixedRecipients,
+      utxos: [
+        { address: recipientAddress, txid: mockTxid, value: 10000 },
+        { address: recipientAddress, txid: mockTxid, value: 10000 },
+      ],
+      feeRate: 1,
+    });
+    const mixedFee = getBitcoinTransactionFee({
+      recipients: mixedRecipients,
+      utxos: [
+        { address: recipientAddress, txid: mockTxid, value: 10000 },
+        { address: taprootAddress, txid: mockTxid, value: 10000 },
+      ],
+      feeRate: 1,
+    });
+
+    expect(allSegwitFee).not.toBeNull();
+    expect(mixedFee).not.toBeNull();
+    expect(mixedFee!.amount.toNumber()).toBeLessThan(allSegwitFee!.amount.toNumber());
+  });
+});
+
 describe('getBitcoinFees', () => {
@@ -62,0 +130,0 @@ it('should return the fees for different fee rates', () => {

src/transactions/generate-unsigned-transaction.spec.ts

@@ -6,5 +6,6 @@ import { hex } from '@scure/base';
 import { OwnedUtxo } from '@leather.io/models';
-import { createMoney } from '@leather.io/utils';
+import { createMoney, hexToNumber } from '@leather.io/utils';
 
 import { getBtcSignerLibNetworkConfigByMode } from '../utils/bitcoin.network';
+import { ecdsaPublicKeyToSchnorr } from '../utils/bitcoin.utils';
 import { createBitcoinAddress } from '../validation/bitcoin-address';
@@ -18,2 +19,3 @@ import {
 const payment = btc.p2wpkh(publicKey, btc.TEST_NETWORK);
+const taprootPayment = btc.p2tr(ecdsaPublicKeyToSchnorr(publicKey), undefined, btc.TEST_NETWORK);
 
@@ -64,7 +66,7 @@ const mockResult = {
     ],
-    payerLookup() {
+    payerLookup(keyOrigin: string) {
       return {
         paymentType: 'p2wpkh',
         address: createBitcoinAddress(payment.address!),
-        keyOrigin: "deadbeef/84'/1'/0'/0/0",
+        keyOrigin,
         masterKeyFingerprint: 'deadbeef',
@@ -83,8 +85,18 @@ network: 'testnet',
     const result = generateBitcoinUnsignedTransaction(mockArgs);
-    if (result) {
-      expect(result.inputs).toEqual(mockResult.inputs);
-      expect(result.fee).toEqual(mockResult.fee);
-      expect(result.hex).toBeDefined();
-      expect(result.psbt).toBeDefined();
-    }
+
+    expect(result.inputs).toEqual(mockResult.inputs);
+    expect(result.fee).toEqual(mockResult.fee);
+
+    const psbtMagic = [0x70, 0x73, 0x62, 0x74, 0xff];
+    expect(Array.from(result.psbt.slice(0, 5))).toEqual(psbtMagic);
+    expect(result.hex.length).toBeGreaterThan(0);
+
+    const psbtInput = result.tx.getInput(0);
+    expect(psbtInput.bip32Derivation).toHaveLength(1);
+    expect(psbtInput.bip32Derivation![0][0]).toEqual(publicKey);
+    expect(psbtInput.bip32Derivation![0][1].fingerprint).toBe(hexToNumber('deadbeef'));
+    expect(psbtInput.bip32Derivation![0][1].path).toEqual(btc.bip32Path("m/84'/1'/0'/0/1"));
+    expect(psbtInput.tapInternalKey).toBeUndefined();
+    expect(psbtInput.witnessUtxo!.script).toEqual(payment.script);
+    expect(psbtInput.witnessUtxo!.amount).toBe(BigInt(200000));
   });
@@ -94,7 +106,12 @@
     const result = generateBitcoinUnsignedTransaction(mockArgs);
+    const fee = BigInt(result.fee.amount.toNumber());
+    const inputTotal = BigInt(200000);
 
-    if (result) {
-      expect(result.tx.outputsLength).toBe(2);
-      expect(result.tx.getOutput(1).script).toBeDefined();
-    }
+    expect(result.tx.outputsLength).toBe(2);
+    expect(result.tx.getOutput(0).amount).toBe(BigInt(150000));
+    expect(result.tx.getOutput(1).script).toBeDefined();
+
+    const recipientAmount = result.tx.getOutput(0).amount!;
+    const changeAmount = result.tx.getOutput(1).amount!;
+    expect(recipientAmount + changeAmount + fee).toBe(inputTotal);
   });
@@ -112,2 +129,323 @@
   });
+
+  it('should not produce change output when change would be below dust threshold', () => {
+    const dustArgs: GenerateBitcoinUnsignedTransactionArgs<OwnedUtxo> = {
+      ...mockArgs,
+      utxos: [
+        {
+          address: payment.address!,
+          path: "m/84'/1'/0'/0/0",
+          keyOrigin: "deadbeef/84'/1'/0'/0/0",
+          txid: '8192e8e20088c5f052fc7351b86b8f60a9454937860b281227e53e19f3e9c3f6',
+          vout: 0,
+          value: 150400,
+        },
+      ],
+      recipients: [
+        {
+          address: 'tb1qsqncyhhqdtfn07t3dhupx7smv5gk83ds6k0gfa',
+          amount: createMoney(150000, 'BTC'),
+        },
+      ],
+    };
+
+    const result = generateBitcoinUnsignedTransaction(dustArgs);
+    const fee = BigInt(result.fee.amount.toNumber());
+
+    expect(result.tx.outputsLength).toBe(1);
+    expect(result.tx.getOutput(0).amount).toBe(BigInt(150000));
+
+    // Change (150400 - 150000 - fee) is below dust, so no change output.
+    // The sub-dust remainder becomes an implicit miner tip.
+    const remainder = BigInt(150400) - BigInt(150000) - fee;
+    expect(remainder).toBeGreaterThan(0n);
+    expect(remainder).toBeLessThan(294n);
+  });
+
+  it('should build correct transaction with isSendingMax for segwit inputs', () => {
+    const sendMaxArgs: GenerateBitcoinUnsignedTransactionArgs<OwnedUtxo> = {
+      ...mockArgs,
+      isSendingMax: true,
+    };
+
+    const result = generateBitcoinUnsignedTransaction(sendMaxArgs);
+
+    expect(result.tx.outputsLength).toBe(1);
+    expect(result.tx.getOutput(0).amount).toBe(BigInt(150000));
+    expect(result.fee.amount.isGreaterThan(0)).toBe(true);
+    expect(result.inputs.length).toBeGreaterThanOrEqual(1);
+
+    const psbtInput = result.tx.getInput(0);
+    expect(psbtInput.bip32Derivation).toHaveLength(1);
+    expect(psbtInput.tapInternalKey).toBeUndefined();
+  });
+
+  describe('taproot inputs', () => {
+    const taprootMockArgs: GenerateBitcoinUnsignedTransactionArgs<OwnedUtxo> = {
+      feeRate: 1,
+      isSendingMax: false,
+      network: getBtcSignerLibNetworkConfigByMode('testnet'),
+      changeAddress: createBitcoinAddress(payment.address!),
+      recipients: [
+        {
+          address: 'tb1qsqncyhhqdtfn07t3dhupx7smv5gk83ds6k0gfa',
+          amount: createMoney(150000, 'BTC'),
+        },
+      ],
+      utxos: [
+        {
+          address: taprootPayment.address!,
+          path: "m/86'/1'/0'/0/0",
+          keyOrigin: "deadbeef/86'/1'/0'/0/0",
+          txid: '8192e8e20088c5f052fc7351b86b8f60a9454937860b281227e53e19f3e9c3f6',
+          vout: 0,
+          value: 100000,
+        },
+        {
+          address: taprootPayment.address!,
+          path: "m/86'/1'/0'/0/1",
+          keyOrigin: "deadbeef/86'/1'/0'/0/1",
+          txid: 'c715ea469c8d794f6dd7e0043148631f69d411c428ef0ab2b04e4528ffe8319f',
+          vout: 1,
+          value: 200000,
+        },
+      ],
+      payerLookup(keyOrigin: string) {
+        return {
+          paymentType: 'p2tr' as const,
+          address: createBitcoinAddress(taprootPayment.address!),
+          keyOrigin,
+          masterKeyFingerprint: 'deadbeef',
+          network: 'testnet',
+          payment: taprootPayment,
+          publicKey,
+        };
+      },
+    };
+
+    it('should set tapInternalKey and tapBip32Derivation for p2tr inputs', () => {
+      const result = generateBitcoinUnsignedTransaction(taprootMockArgs);
+
+      expect(result.hex).toBeDefined();
+      expect(result.psbt).toBeDefined();
+      expect(result.inputs.length).toBe(1);
+
+      const psbtInput = result.tx.getInput(0);
+
+      expect(hex.encode(psbtInput.txid!)).toBe(
+        'c715ea469c8d794f6dd7e0043148631f69d411c428ef0ab2b04e4528ffe8319f'
+      );
+      expect(psbtInput.index).toBe(1);
+
+      expect(psbtInput.tapInternalKey).toEqual(taprootPayment.tapInternalKey);
+      expect(psbtInput.tapBip32Derivation).toHaveLength(1);
+      expect(psbtInput.tapBip32Derivation![0][0]).toEqual(ecdsaPublicKeyToSchnorr(publicKey));
+      expect(psbtInput.tapBip32Derivation![0][1].hashes).toEqual([]);
+      expect(psbtInput.tapBip32Derivation![0][1].der.fingerprint).toBe(hexToNumber('deadbeef'));
+      expect(psbtInput.tapBip32Derivation![0][1].der.path).toEqual(
+        btc.bip32Path("m/86'/1'/0'/0/1")
+      );
+      expect(psbtInput.bip32Derivation).toBeUndefined();
+      expect(psbtInput.witnessUtxo!.script).toEqual(taprootPayment.script);
+      expect(psbtInput.witnessUtxo!.amount).toBe(BigInt(200000));
+
+      expect(result.tx.outputsLength).toBe(2);
+      expect(result.tx.getOutput(0).amount).toBe(BigInt(150000));
+    });
+
+    it('should handle mixed p2wpkh and p2tr inputs', () => {
+      const mixedArgs: GenerateBitcoinUnsignedTransactionArgs<OwnedUtxo> = {
+        feeRate: 1,
+        isSendingMax: false,
+        network: getBtcSignerLibNetworkConfigByMode('testnet'),
+        changeAddress: createBitcoinAddress(payment.address!),
+        recipients: [
+          {
+            address: 'tb1qsqncyhhqdtfn07t3dhupx7smv5gk83ds6k0gfa',
+            amount: createMoney(350000, 'BTC'),
+          },
+        ],
+        utxos: [
+          {
+            address: payment.address!,
+            path: "m/84'/1'/0'/0/0",
+            keyOrigin: "deadbeef/84'/1'/0'/0/0",
+            txid: '8192e8e20088c5f052fc7351b86b8f60a9454937860b281227e53e19f3e9c3f6',
+            vout: 0,
+            value: 300000,
+          },
+          {
+            address: taprootPayment.address!,
+            path: "m/86'/1'/0'/0/0",
+            keyOrigin: "deadbeef/86'/1'/0'/0/0",
+            txid: 'c715ea469c8d794f6dd7e0043148631f69d411c428ef0ab2b04e4528ffe8319f',
+            vout: 1,
+            value: 200000,
+          },
+        ],
+        payerLookup(keyOrigin: string) {
+          if (keyOrigin.includes("86'")) {
+            return {
+              paymentType: 'p2tr' as const,
+              address: createBitcoinAddress(taprootPayment.address!),
+              keyOrigin,
+              masterKeyFingerprint: 'deadbeef',
+              network: 'testnet',
+              payment: taprootPayment,
+              publicKey,
+            };
+          }
+          return {
+            paymentType: 'p2wpkh' as const,
+            address: createBitcoinAddress(payment.address!),
+            keyOrigin,
+            masterKeyFingerprint: 'deadbeef',
+            network: 'testnet',
+            payment: { script: payment.script, type: 'p2wpkh' },
+            publicKey,
+          };
+        },
+      };
+
+      const result = generateBitcoinUnsignedTransaction(mixedArgs);
+
+      expect(result.inputs.length).toBe(2);
+      expect(result.fee.amount.isGreaterThan(0)).toBe(true);
+
+      const segwitInput = result.tx.getInput(0);
+      expect(segwitInput.index).toBe(0);
+      expect(segwitInput.bip32Derivation).toBeDefined();
+      expect(segwitInput.tapInternalKey).toBeUndefined();
+      expect(segwitInput.witnessUtxo!.script).toEqual(payment.script);
+      expect(segwitInput.witnessUtxo!.amount).toBe(BigInt(300000));
+
+      const taprootInput = result.tx.getInput(1);
+      expect(taprootInput.index).toBe(1);
+      expect(taprootInput.tapBip32Derivation).toBeDefined();
+      expect(taprootInput.tapInternalKey).toEqual(taprootPayment.tapInternalKey);
+      expect(taprootInput.bip32Derivation).toBeUndefined();
+      expect(taprootInput.witnessUtxo!.script).toEqual(taprootPayment.script);
+      expect(taprootInput.witnessUtxo!.amount).toBe(BigInt(200000));
+    });
+
+    it('should use native segwit change address even with all taproot inputs', () => {
+      const result = generateBitcoinUnsignedTransaction(taprootMockArgs);
+
+      expect(result.tx.outputsLength).toBe(2);
+
+      const changeScript = result.tx.getOutput(1).script!;
+      expect(changeScript[0]).toBe(0x00);
+      expect(changeScript[1]).toBe(0x14);
+      expect(changeScript.length).toBe(22);
+    });
+
+    it('should build psbt with isSendingMax for taproot inputs', () => {
+      const sendMaxArgs: GenerateBitcoinUnsignedTransactionArgs<OwnedUtxo> = {
+        feeRate: 1,
+        isSendingMax: true,
+        network: getBtcSignerLibNetworkConfigByMode('testnet'),
+        changeAddress: createBitcoinAddress(payment.address!),
+        recipients: [
+          {
+            address: 'tb1qsqncyhhqdtfn07t3dhupx7smv5gk83ds6k0gfa',
+            amount: createMoney(1, 'BTC'),
+          },
+        ],
+        utxos: [
+          {
+            address: taprootPayment.address!,
+            path: "m/86'/1'/0'/0/0",
+            keyOrigin: "deadbeef/86'/1'/0'/0/0",
+            txid: 'c715ea469c8d794f6dd7e0043148631f69d411c428ef0ab2b04e4528ffe8319f',
+            vout: 0,
+            value: 200000,
+          },
+        ],
+        payerLookup(keyOrigin: string) {
+          return {
+            paymentType: 'p2tr' as const,
+            address: createBitcoinAddress(taprootPayment.address!),
+            keyOrigin,
+            masterKeyFingerprint: 'deadbeef',
+            network: 'testnet',
+            payment: taprootPayment,
+            publicKey,
+          };
+        },
+      };
+
+      const result = generateBitcoinUnsignedTransaction(sendMaxArgs);
+
+      expect(result.inputs.length).toBe(1);
+      expect(result.tx.outputsLength).toBe(1);
+
+      expect(result.tx.getOutput(0).amount).toBe(1n);
+      expect(result.fee.amount.isGreaterThan(0)).toBe(true);
+
+      const psbtInput = result.tx.getInput(0);
+      expect(psbtInput.tapInternalKey).toEqual(taprootPayment.tapInternalKey);
+      expect(psbtInput.tapBip32Derivation).toHaveLength(1);
+    });
+
+    it('should skip inputs when payerLookup returns undefined', () => {
+      const undefinedPayerArgs: GenerateBitcoinUnsignedTransactionArgs<OwnedUtxo> = {
+        feeRate: 1,
+        isSendingMax: false,
+        network: getBtcSignerLibNetworkConfigByMode('testnet'),
+        changeAddress: createBitcoinAddress(payment.address!),
+        recipients: [
+          {
+            address: 'tb1qsqncyhhqdtfn07t3dhupx7smv5gk83ds6k0gfa',
+            amount: createMoney(250000, 'BTC'),
+          },
+        ],
+        utxos: [
+          {
+            address: taprootPayment.address!,
+            path: "m/86'/1'/0'/0/0",
+            keyOrigin: "deadbeef/86'/1'/0'/0/0",
+            txid: '8192e8e20088c5f052fc7351b86b8f60a9454937860b281227e53e19f3e9c3f6',
+            vout: 0,
+            value: 200000,
+          },
+          {
+            address: taprootPayment.address!,
+            path: "m/86'/1'/0'/0/1",
+            keyOrigin: "deadbeef/86'/1'/0'/0/1",
+            txid: 'c715ea469c8d794f6dd7e0043148631f69d411c428ef0ab2b04e4528ffe8319f',
+            vout: 1,
+            value: 100000,
+          },
+        ],
+        payerLookup(keyOrigin: string) {
+          if (keyOrigin === "deadbeef/86'/1'/0'/0/1") return undefined;
+          return {
+            paymentType: 'p2tr' as const,
+            address: createBitcoinAddress(taprootPayment.address!),
+            keyOrigin,
+            masterKeyFingerprint: 'deadbeef',
+            network: 'testnet',
+            payment: taprootPayment,
+            publicKey,
+          };
+        },
+      };
+
+      const result = generateBitcoinUnsignedTransaction(undefinedPayerArgs);
+
+      expect(result.inputs.length).toBe(2);
+      expect(result.tx.inputsLength).toBe(1);
+      expect(result.tx.getInput(0).tapInternalKey).toEqual(taprootPayment.tapInternalKey);
+
+      // Known limitation: coin selection computed fee for 2 inputs but only 1
+      // was added to the tx, producing an unbroadcastable transaction where
+      // total output value exceeds the single input's value
+      const singleInputValue = BigInt(200000);
+      let totalOutputValue = 0n;
+      for (let i = 0; i < result.tx.outputsLength; i++) {
+        totalOutputValue += result.tx.getOutput(i).amount!;
+      }
+      expect(totalOutputValue).toBeGreaterThan(singleInputValue);
+    });
+  });
 });

New alerts

Long strings

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Found 1 instance in 1 package

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Package contains fragments of external URLs or IP addresses, which the package may be accessing at runtime.

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Fixed alerts

Long strings

Supply chain risk

Contains long string literals, which may be a sign of obfuscated or packed code.

Found 1 instance in 1 package

URL strings

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Package contains fragments of external URLs or IP addresses, which the package may be accessing at runtime.

Found 1 instance in 1 package

Improved metrics

Total package byte prevSize

490136

5.7%

Lines of code

7411

9.34%

Worsened metrics

Number of low supply chain risk alerts

4

33.33%

Dependency changes

• + Added

  @leather.io/constants@0.33.0
  (transitive)

• + Added

  @leather.io/crypto@1.12.18
  (transitive)

• + Added

  @leather.io/utils@0.50.1
  (transitive)

• - Removed

  @leather.io/constants@0.32.0
  (transitive)

• - Removed

  @leather.io/crypto@1.12.17
  (transitive)

• - Removed

  @leather.io/utils@0.50.0
  (transitive)

• Updated

  @leather.io/constants@0.33.0

• Updated

  @leather.io/crypto@1.12.18

• Updated

  @leather.io/utils@0.50.1