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OttoAllmendingerOttoAllmendinger
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Merge pull request #5381 from BitGo/BTC-1731.abstract-utxo-offline-vault
feat(abstract-utxo): add descriptor signing support for offline vault
2 parents ad33065 + 7082893 commit 49ae008

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‎modules/abstract-utxo/src/names.ts‎

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@@ -82,6 +82,19 @@ export function getChainFromNetwork(n: utxolib.Network): string {
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}
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}
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/**
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* @param coinName - the name of the coin (e.g. 'btc', 'bch', 'ltc'). Also called 'chain' in some contexts.
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* @returns the network for a coin. This is the mainnet network for the coin.
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*/
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export function getNetworkFromChain(coinName: string): utxolib.Network {
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for (const network of utxolib.getNetworkList()) {
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if (getChainFromNetwork(network) === coinName) {
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return network;
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}
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}
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throw new Error(`Unknown chain ${coinName}`);
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}
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export function getFullNameFromNetwork(n: utxolib.Network): string {
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const name = getNetworkName(n);
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‎modules/abstract-utxo/src/offlineVault/OfflineVaultHalfSigned.ts‎

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import * as utxolib from '@bitgo/utxo-lib';
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import { BIP32Interface } from '@bitgo/utxo-lib';
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import { getNetworkFromChain } from '../names';
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import { OfflineVaultUnsigned } from './OfflineVaultUnsigned';
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import { DescriptorTransaction, getHalfSignedPsbt } from './descriptor';
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export type OfflineVaultHalfSigned = {
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halfSigned: { txHex: string };
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};
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function createHalfSignedFromPsbt(psbt: utxolib.Psbt): OfflineVaultHalfSigned {
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return { halfSigned: { txHex: psbt.toHex() } };
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}
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export function createHalfSigned(coin: string, prv: string | BIP32Interface, tx: unknown): OfflineVaultHalfSigned {
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const network = getNetworkFromChain(coin);
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if (typeof prv === 'string') {
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prv = utxolib.bip32.fromBase58(prv);
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}
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if (!OfflineVaultUnsigned.is(tx)) {
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throw new Error('unsupported transaction type');
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}
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if (DescriptorTransaction.is(tx)) {
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return createHalfSignedFromPsbt(getHalfSignedPsbt(tx, prv, network));
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}
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throw new Error('unsupported transaction type');
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}

‎modules/abstract-utxo/src/offlineVault/OfflineVaultUnsigned.ts‎

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import * as utxolib from '@bitgo/utxo-lib';
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import { Triple } from '@bitgo/sdk-core';
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import * as t from 'io-ts';
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export const XPubWithDerivationPath = t.intersection(
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[t.type({ xpub: t.string }), t.partial({ derivationPath: t.string })],
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'XPubWithDerivationPath'
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);
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export type XPubWithDerivationPath = t.TypeOf<typeof XPubWithDerivationPath>;
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/**
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* This is the transaction payload that is sent to the offline vault to sign.
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*/
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export const OfflineVaultUnsigned = t.type(
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{
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xpubsWithDerivationPath: t.type({
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user: XPubWithDerivationPath,
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backup: XPubWithDerivationPath,
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bitgo: XPubWithDerivationPath,
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}),
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coinSpecific: t.type({ txHex: t.string }),
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},
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'BaseTransaction'
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);
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export type OfflineVaultUnsigned = t.TypeOf<typeof OfflineVaultUnsigned>;
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type WithXpub = { xpub: string };
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type NamedKeys = { user: WithXpub; backup: WithXpub; bitgo: WithXpub };
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export function toKeyTriple(xpubs: NamedKeys): Triple<utxolib.BIP32Interface> {
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return [xpubs.user.xpub, xpubs.backup.xpub, xpubs.bitgo.xpub].map((xpub) =>
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utxolib.bip32.fromBase58(xpub)
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) as Triple<utxolib.BIP32Interface>;
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}

‎modules/abstract-utxo/src/offlineVault/descriptor/index.ts‎

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export * from './transaction';

‎modules/abstract-utxo/src/offlineVault/descriptor/transaction.ts‎

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import * as utxolib from '@bitgo/utxo-lib';
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import * as t from 'io-ts';
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import { NamedDescriptor } from '../../descriptor';
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import { OfflineVaultUnsigned, toKeyTriple } from '../OfflineVaultUnsigned';
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import {
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getValidatorOneOfTemplates,
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getValidatorSignedByUserKey,
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getValidatorSome,
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toDescriptorMapValidate,
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} from '../../descriptor/validatePolicy';
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import { DescriptorMap } from '../../core/descriptor';
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import { signPsbt } from '../../transaction/descriptor';
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export const DescriptorTransaction = t.intersection(
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[OfflineVaultUnsigned, t.type({ descriptors: t.array(NamedDescriptor) })],
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'DescriptorTransaction'
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);
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export type DescriptorTransaction = t.TypeOf<typeof DescriptorTransaction>;
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export function getDescriptorsFromDescriptorTransaction(tx: DescriptorTransaction): DescriptorMap {
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const { descriptors, xpubsWithDerivationPath } = tx;
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const pubkeys = toKeyTriple(xpubsWithDerivationPath);
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const policy = getValidatorSome([
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// allow all 2-of-3-ish descriptors where the keys match the wallet keys
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getValidatorOneOfTemplates(['Wsh2Of3', 'Wsh2Of3CltvDrop', 'ShWsh2Of3CltvDrop']),
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// allow all descriptors signed by the user key
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getValidatorSignedByUserKey(),
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]);
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return toDescriptorMapValidate(descriptors, pubkeys, policy);
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}
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export function getHalfSignedPsbt(
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tx: DescriptorTransaction,
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prv: utxolib.BIP32Interface,
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network: utxolib.Network
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): utxolib.Psbt {
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const psbt = utxolib.bitgo.createPsbtDecode(tx.coinSpecific.txHex, network);
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const descriptorMap = getDescriptorsFromDescriptorTransaction(tx);
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signPsbt(psbt, descriptorMap, prv, { onUnknownInput: 'throw' });
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return psbt;
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}

‎modules/abstract-utxo/src/offlineVault/index.ts‎

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export * as descriptor from './descriptor';
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export * from './OfflineVaultHalfSigned';

‎modules/abstract-utxo/test/offlineVault/fixtures/Wsh2Of3.buildAdmin.custodial.json‎

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{
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"walletKeys": [
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"xprv9zXudaVgkhXsjTeXgpJ3K62R6bZDYQ5L5TVYfhGPLDDLNhfLtCYwHm4R4aMnMMeRpHSiM5Krxxbrux7iz99f7rSmZyddtBogiSch4PRVVXZ",
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"xpub6CYwP1gQmPLwzD67x2nBoxiKquYs2CQExaqyQ3KbcntynZCoUGKErxXNg6Mft3x7r5c1xtHTp827ZRQY7dwUa8XYjQ5RCPUwtTPAe6bSv8b",
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"xprv9s21ZrQH143K3Kh6W9VDkrpUSDrikEYKbbEKyB5Xn9bJeBPRSRSyWqQ5Fzoujj4eFmRKrxFPipYtfVqyu3aNYH4Lojrdhemi4aUdX8CjD8W"
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],
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"response": {
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"txBase64": "cHNidP8BAN0CAAAAAgEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAAAAAAD9////AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAAAAAP3///8DQEIPAAAAAAAiACAuAn5Z4A9++9biGFSGSJS+3cnn3ohmFQFpd0KlDIOfDYCEHgAAAAAAIgAgLgJ+WeAPfvvW4hhUhkiUvt3J596IZhUBaXdCpQyDnw376b0LAAAAACIAIHLLoHpPlak2CJhRYi7qO2MjLed3pKYntyo8SVjwbzOhAAAAAAABASsA4fUFAAAAACIAIC4CflngD3771uIYVIZIlL7dyefeiGYVAWl3QqUMg58NAQVpUiEC9wkjs3h1EBsdSbCEm+/vS3u5+Q8/Vx96MYf5jrRaBh4hAtIS5E2sC0WGyraJxWaWPsyZTTAFCJORgMu3B+E6jDLfIQI722k8S/c1hwtcvieb8+hrEd+73y/VQpRbvO+Nlt0Xe1OuIgYCO9tpPEv3NYcLXL4nm/PoaxHfu98v1UKUW7zvjZbdF3sMWeYqcQAAAAAAAAAAIgYC0hLkTawLRYbKtonFZpY+zJlNMAUIk5GAy7cH4TqMMt8MFQhHCwAAAAAAAAAAIgYC9wkjs3h1EBsdSbCEm+/vS3u5+Q8/Vx96MYf5jrRaBh4MKhST6AAAAAAAAAAAAAEBKwDh9QUAAAAAIgAgLgJ+WeAPfvvW4hhUhkiUvt3J596IZhUBaXdCpQyDnw0BBWlSIQL3CSOzeHUQGx1JsISb7+9Le7n5Dz9XH3oxh/mOtFoGHiEC0hLkTawLRYbKtonFZpY+zJlNMAUIk5GAy7cH4TqMMt8hAjvbaTxL9zWHC1y+J5vz6GsR37vfL9VClFu8742W3Rd7U64iBgI722k8S/c1hwtcvieb8+hrEd+73y/VQpRbvO+Nlt0XewxZ5ipxAAAAAAAAAAAiBgLSEuRNrAtFhsq2icVmlj7MmU0wBQiTkYDLtwfhOowy3wwVCEcLAAAAAAAAAAAiBgL3CSOzeHUQGx1JsISb7+9Le7n5Dz9XH3oxh/mOtFoGHgwqFJPoAAAAAAAAAAAAAQFpUiEC9wkjs3h1EBsdSbCEm+/vS3u5+Q8/Vx96MYf5jrRaBh4hAtIS5E2sC0WGyraJxWaWPsyZTTAFCJORgMu3B+E6jDLfIQI722k8S/c1hwtcvieb8+hrEd+73y/VQpRbvO+Nlt0Xe1OuIgICO9tpPEv3NYcLXL4nm/PoaxHfu98v1UKUW7zvjZbdF3sMWeYqcQAAAAAAAAAAIgIC0hLkTawLRYbKtonFZpY+zJlNMAUIk5GAy7cH4TqMMt8MFQhHCwAAAAAAAAAAIgIC9wkjs3h1EBsdSbCEm+/vS3u5+Q8/Vx96MYf5jrRaBh4MKhST6AAAAAAAAAAAAAEBaVIhAvcJI7N4dRAbHUmwhJvv70t7ufkPP1cfejGH+Y60WgYeIQLSEuRNrAtFhsq2icVmlj7MmU0wBQiTkYDLtwfhOowy3yECO9tpPEv3NYcLXL4nm/PoaxHfu98v1UKUW7zvjZbdF3tTriICAjvbaTxL9zWHC1y+J5vz6GsR37vfL9VClFu8742W3Rd7DFnmKnEAAAAAAAAAACICAtIS5E2sC0WGyraJxWaWPsyZTTAFCJORgMu3B+E6jDLfDBUIRwsAAAAAAAAAACICAvcJI7N4dRAbHUmwhJvv70t7ufkPP1cfejGH+Y60WgYeDCoUk+gAAAAAAAAAAAABAWlSIQNEoEL2IutxoZ+A74v7hk8gaO0tBkPRZbps5nQTTZy5RiED/TztbXrbe277ngeo5gQl9z+4gqai6uQb8wOqEQwOhXEhArSwlLUidtqWhqmgN5ZNm2N7ulwrPy97hSH7qUhRApoWU64iAgK0sJS1InbaloapoDeWTZtje7pcKz8ve4Uh+6lIUQKaFgxZ5ipxAAAAAAEAAAAiAgNEoEL2IutxoZ+A74v7hk8gaO0tBkPRZbps5nQTTZy5RgwqFJPoAAAAAAEAAAAiAgP9PO1tett7bvueB6jmBCX3P7iCpqLq5BvzA6oRDA6FcQwVCEcLAAAAAAEAAAAA",
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"descriptors": [
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{
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"name": "external",
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"value": "wsh(multi(2,xpub6DXG362ab56Awwiznqq3gDy9edPhwroBSgR9U5fztYkKFVzVRjsBqZNtusyuT3U841NogK9ByRFHz6Zhb5jTGWkiJyu3SVBqKiPFzw2GcyV/0/*,xpub6CYwP1gQmPLwzD67x2nBoxiKquYs2CQExaqyQ3KbcntynZCoUGKErxXNg6Mft3x7r5c1xtHTp827ZRQY7dwUa8XYjQ5RCPUwtTPAe6bSv8b/0/*,xpub661MyMwAqRbcFomZcB2E7zmCzFhD9hGAxp9vmZV9LV8HWyiZyxmE4diZ7EREPnU5XdHjx1w9Xp2o7qtP3mGmWM6SWYD1zGcA2VuU6VEjomd/0/*))#gw7wwcku",
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"signatures": [],
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"lastIndex": 1
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},
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{
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"name": "internal",
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"value": "wsh(multi(2,xpub6DXG362ab56Awwiznqq3gDy9edPhwroBSgR9U5fztYkKFVzVRjsBqZNtusyuT3U841NogK9ByRFHz6Zhb5jTGWkiJyu3SVBqKiPFzw2GcyV/1/*,xpub6CYwP1gQmPLwzD67x2nBoxiKquYs2CQExaqyQ3KbcntynZCoUGKErxXNg6Mft3x7r5c1xtHTp827ZRQY7dwUa8XYjQ5RCPUwtTPAe6bSv8b/1/*,xpub661MyMwAqRbcFomZcB2E7zmCzFhD9hGAxp9vmZV9LV8HWyiZyxmE4diZ7EREPnU5XdHjx1w9Xp2o7qtP3mGmWM6SWYD1zGcA2VuU6VEjomd/1/*))#sw3k4yqr",
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"signatures": [],
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"lastIndex": 0
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}
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],
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"formatVersion": 1,
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"coin": "btc",
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"pubs": [
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"xpub6DXG362ab56Awwiznqq3gDy9edPhwroBSgR9U5fztYkKFVzVRjsBqZNtusyuT3U841NogK9ByRFHz6Zhb5jTGWkiJyu3SVBqKiPFzw2GcyV",
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"xpub6CYwP1gQmPLwzD67x2nBoxiKquYs2CQExaqyQ3KbcntynZCoUGKErxXNg6Mft3x7r5c1xtHTp827ZRQY7dwUa8XYjQ5RCPUwtTPAe6bSv8b",
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"xpub661MyMwAqRbcFomZcB2E7zmCzFhD9hGAxp9vmZV9LV8HWyiZyxmE4diZ7EREPnU5XdHjx1w9Xp2o7qtP3mGmWM6SWYD1zGcA2VuU6VEjomd"
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],
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"xpubsWithDerivationPath": {
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"user": {
32+
"xpub": "xpub6DXG362ab56Awwiznqq3gDy9edPhwroBSgR9U5fztYkKFVzVRjsBqZNtusyuT3U841NogK9ByRFHz6Zhb5jTGWkiJyu3SVBqKiPFzw2GcyV",
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"derivedFromParentWithSeed": "143700591154482"
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},
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"backup": {
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"xpub": "xpub6CYwP1gQmPLwzD67x2nBoxiKquYs2CQExaqyQ3KbcntynZCoUGKErxXNg6Mft3x7r5c1xtHTp827ZRQY7dwUa8XYjQ5RCPUwtTPAe6bSv8b",
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"derivedFromParentWithSeed": "210593312354420"
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},
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"bitgo": {
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"xpub": "xpub661MyMwAqRbcFomZcB2E7zmCzFhD9hGAxp9vmZV9LV8HWyiZyxmE4diZ7EREPnU5XdHjx1w9Xp2o7qtP3mGmWM6SWYD1zGcA2VuU6VEjomd"
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}
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},
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"walletId": "6788d3cf8eaf7aa1db27d4575218103c",
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"walletLabel": "UtxoWalletClient",
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"amount": "199995579",
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"address": "bc1q9cp8uk0qpal0h4hzrp2gvjy5hmwune773pnp2qtfwap22ryrnuxsehzwgh",
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"pendingApprovalId": "6788d3cf8eaf7aa1db27d4f563e0e411",
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"creatorId": "6788d3ce8eaf7aa1db27d18bc5baa93d",
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"creatorEmail": "[email protected]",
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"createDate": "2025-01-16T09:39:27.667Z",
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"enterpriseId": "6788d3ce8eaf7aa1db27d2a664daec54",
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"enterpriseName": "Foo Enterprises",
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"enterpriseFeatureFlags": [
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"enableMMI"
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],
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"videoId": {
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"approver": "",
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"date": "",
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"link": "",
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"exception": "",
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"waived": true
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},
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"coinSpecific": {
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"txHex": "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",
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"inputIds": [
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"0101010101010101010101010101010101010101010101010101010101010101:0",
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"0101010101010101010101010101010101010101010101010101010101010101:1"
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]
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},
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"recipientsInfo": [],
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"keyDerivationPath": "143700591154482"
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}
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}

‎modules/abstract-utxo/test/offlineVault/halfSigned.ts‎

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import * as fs from 'fs';
2+
import assert from 'assert';
3+
import crypto from 'crypto';
4+
5+
import * as t from 'io-ts';
6+
import * as utxolib from '@bitgo/utxo-lib';
7+
8+
import { createHalfSigned } from '../../src/offlineVault';
9+
import { DescriptorTransaction } from '../../src/offlineVault/descriptor';
10+
11+
function getFixturesNames(): string[] {
12+
// I'm using sync here because mocha cannot do async setup
13+
// eslint-disable-next-line no-sync
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return fs.readdirSync(__dirname + '/fixtures').filter((f) => f.endsWith('.json'));
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}
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const Fixture = t.type({
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walletKeys: t.array(t.string),
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response: t.unknown,
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});
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type Fixture = t.TypeOf<typeof Fixture>;
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async function readFixture(name: string): Promise<Fixture> {
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const data = JSON.parse(await fs.promises.readFile(__dirname + '/fixtures/' + name, 'utf-8'));
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if (!Fixture.is(data)) {
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throw new Error(`Invalid fixture ${name}`);
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}
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return data;
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}
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function withRotatedXpubs(tx: DescriptorTransaction): DescriptorTransaction {
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const { user, backup, bitgo } = tx.xpubsWithDerivationPath;
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return {
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...tx,
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xpubsWithDerivationPath: {
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user: bitgo,
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backup: user,
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bitgo: backup,
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},
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};
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}
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function withRandomXpubs(tx: DescriptorTransaction) {
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function randomXpub() {
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const bytes = crypto.getRandomValues(new Uint8Array(32));
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return utxolib.bip32.fromSeed(Buffer.from(bytes)).neutered().toBase58();
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}
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return {
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...tx,
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xpubsWithDerivationPath: {
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user: randomXpub(),
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backup: randomXpub(),
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bitgo: randomXpub(),
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},
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};
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}
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function withoutDescriptors(tx: DescriptorTransaction): DescriptorTransaction {
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return {
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...tx,
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descriptors: [],
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};
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}
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describe('OfflineVaultHalfSigned', function () {
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for (const fixtureName of getFixturesNames()) {
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it(`can sign fixture ${fixtureName}`, async function () {
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const { walletKeys, response } = await readFixture(fixtureName);
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const prv = utxolib.bip32.fromBase58(walletKeys[0]);
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createHalfSigned('btc', prv, response);
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assert(DescriptorTransaction.is(response));
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const mutations = [withRotatedXpubs(response), withRandomXpubs(response), withoutDescriptors(response)];
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for (const mutation of mutations) {
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assert.throws(() => createHalfSigned('btc', prv, mutation));
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}
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});
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}
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});

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