bitcoin-proof

Merkle proof for a Bitcoin transaction.

Install

npm install bitcoin-proof

API

• getProof(String[] txIds, Number txIndex)
• getTxMerkle({txId: String, txIndex: Number, sibling: String[]})
• getMerkleRoot(String[] txIds)

---

getProof(String[] txIds, Number txIndex) -> {txId: String, txIndex: Number, sibling: String[]}

Computes the Merkle proof of a given transaction.

• txIds - array of transaction hashes (as hex string)
• txIndex - index of which transaction to compute a Merkle proof for

Returns an object with the following keys:

• txId - transaction hash that the Merkle proof is computed for
• txIndex - index of txId among txIds
• sibling - sibling hashes of txId which comprise the Merkle proof

---

getTxMerkle({txId: String, txIndex: Number, sibling: String[]}) -> String

Computes the Merkle root of a given proof.

• proof - an object of the form returned by getProof

Returns the Merkle root as a hex string.

---

getMerkleRoot(String[] txIds) -> String

Computes the Merkle root of a set of transactions.

• txIds - array of transaction hashes (as hex string)

Returns the Merkle root as a hex string.

Usage

var btcProof = require('bitcoin-proof');
 
var BLOCK_100K_TRANSACTIONS = [
  '8c14f0db3df150123e6f3dbbf30f8b955a8249b62ac1d1ff16284aefa3d06d87',
  'fff2525b8931402dd09222c50775608f75787bd2b87e56995a7bdd30f79702c4',
  '6359f0868171b1d194cbee1af2f16ea598ae8fad666d9b012c8ed2b79a236ec4',
  'e9a66845e05d5abc0ad04ec80f774a7e585c6e8db975962d069a522137b80c1d'
];
 
var proofOfFirstTx = btcProof.getProof(BLOCK_100K_TRANSACTIONS, 0);
// {
//   txId: '8c14f0db3df150123e6f3dbbf30f8b955a8249b62ac1d1ff16284aefa3d06d87',
//   txIndex: 0,
//   sibling: [
//     'fff2525b8931402dd09222c50775608f75787bd2b87e56995a7bdd30f79702c4',
//     '8e30899078ca1813be036a073bbf80b86cdddde1c96e9e9c99e9e3782df4ae49'
//   ]
// }
 
var proofOfLastTx = btcProof.getProof(BLOCK_100K_TRANSACTIONS, 3);
// {
//   txId: 'e9a66845e05d5abc0ad04ec80f774a7e585c6e8db975962d069a522137b80c1d',
//   txIndex: 0,
//   sibling: [
//     '6359f0868171b1d194cbee1af2f16ea598ae8fad666d9b012c8ed2b79a236ec4',
//     'ccdafb73d8dcd0173d5d5c3c9a0770d0b3953db889dab99ef05b1907518cb815'
//   ]
// }

License

MIT