vega-frontend-monorepo/libs/wallet/src/utils.ts

import { ethers } from 'ethers';
import { sha3_256 } from 'js-sha3';
import type { Transaction } from './connectors';

/**
 * Creates an ID in the same way that core does on the backend. This way we
 * Can match up the newly created order with incoming orders via a subscription
 */
export const determineId = (sig: string) => {
  return sha3_256(ethers.utils.arrayify('0x' + sig));
};

/**
 * Base64 encode a transaction object
 */
export const encodeTransaction = (tx: Transaction): string => {
  return ethers.utils.base64.encode(
    ethers.utils.toUtf8Bytes(JSON.stringify(tx))
  );
};