Get an SPV envelope for any transaction

The code is hosted on GitHub and the package is available through NPM.

npm i hash-wrap

const hashwrap = require('hash-wrap')

// You just need the TXID
// Envelope is an object that contains an SPV envelope
const envelope = await hashwrap('your-txid-here')

• hashwrap
  • Parameters

Returns an SPV envelope given the TXID of the target transaction.

The returned object for mined transactions looks like:

rawTx
proof: {
  txOrId: transaction hash
  target: merkle root
  targetType: 'merkleRoot'
  nodes: array of merkle tree hashes
  index: integer binary encoding of left (1) or right (0) path through the merkle tree
}

The returned object for pending transactions looks like:

rawTx
mapiResponses: array of single mapi response for this transaction id
inputs: an object where keys are transaction ids that contributed inputs to this transaction and value is recursive hashwrap of those txids.

Uses api.whatsonchain.com to lookup raw transaction and merkle proofs.

For pending transactions (without merkle proofs): Use the taalApiKey property on the options parameter object to use TAAL's mAPI. Otherwise mapi.gorillapool.io is used.

• txid String The confirmed or unconformed TXID for which you would like to generate an SPV envelope.
• options Object Optional. Provide a TAAL api key with { taalApiKey: 'mainnet_9596de07e92300c6287e43...' }. Provide { network: 'testnet' or 'mainnet' }. If testnet, a testnet TAAL key is required (optional, default {})

Returns Object The SPV envelope associated with the TXID you provided.

The license for the code in this repository is the Open BSV License.