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Текущая директория: /opt/BitGoJS/modules/utxo-bin/src

Просмотр файла: hollowSegwitSpend.ts

import * as utxolib from '@bitgo/utxo-lib';

/**
 * Users can mistakenly create wrapped segwit outputs on chains that do not support it (bitcoincash, bitcoinSV).
 *
 * These funds can be claimed by miners that learn the hash preimage, typically by observing a spend on the bitcoin
 * chain.
 *
 * Since the transaction does not have a full inner script, let's call them "hollow".
 *
 * See https://bitcoin.stackexchange.com/a/115850/137601 for more details.
 */
export type HollowSegwitSpend =
  /** Wrapped Segwit Pay-To-Witness-Script-Hash */
  | { scriptType: 'p2shP2wshHollow' }
  /** Wrapped Segwit Pay-To-Pubkey-Hash */
  | { scriptType: 'p2shP2wpkhHollow' };

/**
 * @return HollowSegwitSpend if spend is a
 */
export function parseHollowSegwitSpend(
  input: utxolib.TxInput,
  network: utxolib.Network
): HollowSegwitSpend | undefined {
  if (
    utxolib.getMainnet(network) !== utxolib.networks.bitcoincash &&
    utxolib.getMainnet(network) !== utxolib.networks.bitcoinsv
  ) {
    // this can only happen on the BCH/BSV forks
    return;
  }

  const type = utxolib.classify.input(input.script, true);
  if (type !== 'scripthash') {
    // this can only happen for p2sh spends
    return;
  }

  const bufs = utxolib.script.decompile(input.script);
  if (!bufs || bufs.length !== 1) {
    return;
  }

  const buf = bufs[0];
  if (typeof buf === 'number') {
    return;
  }

  const [a, b] = buf;
  if (a === 0x00 && b === 0x14 && buf.length === 22) {
    return { scriptType: 'p2shP2wpkhHollow' };
  }

  if (a === 0x00 && b === 0x20 && buf.length === 34) {
    return { scriptType: 'p2shP2wshHollow' };
  }
}

export function getHollowSpendMessage(): string {
  return `This output was likely claimed by a miner. See https://bitcoin.stackexchange.com/a/115850/137601 for details.`;
}

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