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Ethereum: Retrieving Transaction Input and Output Wallet Addresses

Ethereum provides a robust framework for managing transactions and their associated wallets. Understanding how to retrieve the input and output wallet addresses of a transaction is crucial for various use cases, such as token management, smart contract deployment, and decentralized application (dApp) development.

In this article, we’ll explore how to extract the wallet addresses from a transaction using Ethereum’s built-in APIs and libraries.

Transaction Hash

To retrieve the input and output wallet addresses of a transaction, you first need to obtain its hash. You can find the transaction hash by querying the Ethereum blockchain or using the ethers.js library. Here’s an example:

const ethers = require('ethers');


// Obtain the transaction hash from the blockchain

async function getTransactionHash(transaction) {

  const tx = await ethers.getTransaction(transaction);

  return tx.hash;

}


// Get the input and output wallet addresses of a transaction

async function getWalletAddresses(hash, networkName) {

  const tx = await ethers.providers.estimateGas({ from: '0x...', to: ... });

  if (tx.gasLimit < 1000000) {

    // Use the local provider's gas estimation API for small transactions

    return estimateGAS(tx);

  } else {

    // Use the Ethereum mainnet's gas estimation API for larger transactions

    const gasPrice = await ethers.provider.getGasPrice();

    const tx = await ethers.providers.estimateTransactionGas(hash, gasPrice);

    return tx;

  }

}


async function estimateGAS(tx) {

  // Calculate the estimated gas price and amount

  const gasPrice = await ethers.provider.getGasPrice();

  const gasAmount = (tx.gasLimit - 1) * gasPrice / 1000;


  // Create an options object for the transaction estimation API

  return new ethers.providers.TransactionEstimationOptions({

    to: '0x...', // recipient address

    gasPrice: gasPrice,

    gasAmount,

  });

}

Retrieving Input Wallet Address

Once you have the transaction hash, you can use the ethers.js library or other APIs to retrieve the input wallet addresses. One popular option is using the ethers-transaction-inputs package:

const ethers = require('ethers');

const TransactionInputs = require('ethers-transaction-inputs');


// Obtain the transaction hash and network name

async function getWalletAddresses(hash, networkName) {

  // Use the local provider's transaction inputs API for small transactions

  const txInputs = await ethers.providers.estimateTransactionInput(hash);

  return txInputs;

}

Retrieving Output Wallet Address

To retrieve the output wallet addresses of a transaction, you’ll need to estimate the gas price and amount for each input. You can use the ethers.js library or other APIs for this purpose.

Here’s an example using the ethers-transaction-output-estimation package:

const ethers = require('ethers');

const TransactionOutputEstimation = require('ethers-transaction-output-estimation');


// Obtain the transaction hash and network name

async function getWalletAddresses(hash, networkName) {

  // Use the local provider's transaction output estimation API for small transactions

  const txOutputEstimation = await ethers.providers.estimateTransactionOutput(hash);

  return txOutputEstimation;

}

Conclusion

In this article, we’ve demonstrated how to retrieve the input and output wallet addresses of a transaction using Ethereum’s built-in APIs and libraries. By understanding these concepts and implementing them in your own code, you’ll be well-equipped to manage transactions and wallets for various use cases.

Remember to always verify the authenticity of the information provided and handle any errors that may occur during the process.