Getting the Operation Hash without Injecting

There might come a time when you would like to retrieve the operation hash without injecting it into the blockchain.

To accomplish this, we have a utility function called encodeOpHash() in the @taquito/utils package. This function takes in the signed operation bytes in the form of a string, and outputs the operation hash of said transaction without injecting it.

Usage example

Here is a simple example on getting the operation hash of a transaction (transfer) operation:

// import { TezosToolkit } from '@taquito/taquito';
// import { encodeOpHash } from '@taquito/utils';
// import { LocalForger } from '@taquito/local-forging';

// const Tezos = new TezosToolkit('RPC_ENDPOINT');

const preparedTransfer = await Tezos.prepare.transaction({
  amount: 1,
  to: 'tz1ZfrERcALBwmAqwonRXYVQBDT9BjNjBHJu'
});


// convert prepared operation into a forgeable object
const forgeParams = await Tezos.prepare.toForge(preparedTransfer);

// forge the transaction operation
const forger = new LocalForger();
const forgedBytes = await forger.forge(forgeParams);

// sign the transaction operation
const signedBytes = await Tezos.signer.sign(forgedBytes);

// get the operation hash using the encodeOpHash() function
const opHash = encodeOpHash(signedBytes.sbytes, new Uint8Array([3]));