How to get sender’s Ethereum address and public key from signed transaction. (2024)

1 min read

Aug 5, 2018

In this article, I’d like to explain how to get Ethereum address and public key of sender (who signs to transaction) from signed transaction.

Below is an actual signed transaction which has been sent to Ropsten network: https://ropsten.etherscan.io/tx/0xf4727b35f10cbe2256b38adcc594f25854a7f16c8461e280079e7003a18d446d

0xf86b808504a817c800825208942890228d4478e2c3b0ebf5a38479e3396c1d6074872386f26fc100008029a0520e5053c1b573d747f823a0b23d52e5a619298f46cd781d677d0e5e78fbc750a075be461137c2c2a5594beff76ecb11a215384c574a7e5b620dba5cc63b0a0f13

Create a Transaction object of the ethereumjs-tx from the signed transaction.
Then use getSenderAddress() and getSenderPublicKey() method to get sender’s Ethereum address and public key.

const EthUtil = require('ethereumjs-util')
const EthTx = require('ethereumjs-tx')// signed tx
const signedTx = "0xf86b808504a817c800825208942890228d4478e2c3b0ebf5a38479e3396c1d6074872386f26fc100008029a0520e5053c1b573d747f823a0b23d52e5a619298f46cd781d677d0e5e78fbc750a075be461137c2c2a5594beff76ecb11a215384c574a7e5b620dba5cc63b0a0f13"// Create a tx object from signed tx 
const tx = new EthTx(signedTx)// Get an address of sender
const address = EthUtil.bufferToHex(tx.getSenderAddress())// get a public key of sender
const publicKey = EthUtil.bufferToHex(tx.getSenderPublicKey())console.log(address)
// => 0x89c24a88bad4abe0a4f5b2eb5a86db1fb323832cconsole.log(publicKey)
// => 0xfff49b58b83104ff16875452852466a46c7169ba4e368d11830c9170624e0a9509080a05a38c18841718ea4fc13483ac467d3e2d728d41ff16b73b9c943734f8

Internally ethereumjs-tx uses ecrecover to verify signature and get a public key.
Ethereum address can be calculated from a public key.

How to get sender’s Ethereum address and public key from signed transaction. (2024)

FAQs

How do you get the address from the public key in Ethereum? ›

The public key is generated from the private key using the Elliptic Curve Digital Signature Algorithm. You get a public address for your account by taking the last 20 bytes of the Keccak-256 hash of the public key and adding 0x to the beginning.

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How do you derive the public key from the private key in Ethereum? ›

The public key is simply the private key multiplied by the point G on the secp256k1 elliptic curve. That's it.

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How do I get Ethereum private key from address? ›

Here is a step-by-step guide:

Log into your wallet via web-browser.
Navigate to Settings - Wallets & Addresses and select Ethereum.
Read the warning message and click Show button to view your private key.

May 29, 2023

What is the Ethereum sender address? ›

Basically, the Ethereum address is the "public" address that you would need to receive funds from another party through the Ethereum network. This means if the network is on a different network, the fund will not appear in the recipient's wallet address.

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How can I get my Ethereum address? ›

You can find out your Ethereum address by opening your multi-chain Bitcoin wallet. Read more: How do I create an Ethereum wallet? Every Ethereum wallet is a little different, but your Ethereum address will always be displayed somewhere within the wallet.

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How to get public key from wallet address? ›

You can retrieve the public key from address with the reference client using the validateaddress RPC call (or in the debug window of Bitcoin-Qt), but that simply fetches it from the wallet, and only works if the address belongs to you. Update: you need to use getaddressinfo now instead of validateaddress .

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How do I recover my private key Ethereum? ›

Please take note that if a private key is lost, there is no way to either recover it or to regenerate it. If you've backed up your ETH Wallet, you can recover access to it by importing/adding it within the app. Reinstall the app. Once your keys are recovered, you'll be able to access your crypto assets.

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How to get the public key from the private key in crypto? ›

A public key is created via elliptic curve multiplication. In technical terms, you multiply a starting point (generator point) on the secp256k1 elliptic curve by the private key (a random number), and this results in a new set of x and y coordinates, which is the public key.

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What is the private key in Ethereum transaction? ›

An Ethereum private key is a 256-bit number usually represented in hexadecimal format (32 bytes or 64 characters when represented in hexadecimal). It serves as a digital identity that enables you to sign transactions and securely manage your Ethereum assets.

How to find the private key of a wallet? ›

Backup Recovery Phrase (Seed Phrase):Many wallets use a recovery phrase (often 12 or 24 words) that you should have written down when you first set up the wallet. If you have this recovery phrase, you can typically recover your wallet and its private keys on any compatible wallet software or hardware device.

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Where are Ethereum private keys stored? ›

The public key itself is not stored anywhere on the blockchain. The private key is stored in your keystore (or ledger, or trezor, or whatever device).

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How do I generate random Ethereum address? ›

Vanity-ETH is an open-source tool that uses your web browser to generate Ethereum vanity addresses. Enter a short prefix and/or suffix of your choice and click Generate to start.

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What is the public key of Ethereum address? ›

To derive an Ethereum public address from the Keccak-256 hash of a public key, you follow these steps: Take the Keccak-256 hash of the uncompressed public key (excluding the 0x04 prefix if present, which is already done in our case). Extract the last 40 characters (20 bytes) of the hash.

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Can you trace an Ethereum address? ›

One way is to use the Defi dashboards, which let you track any Ethereum wallet address. Then, there are specialized wallet and tracker apps that let you punch in your wallet address or any Ethereum wallet address to let you track it.

How do I investigate an ETH address? ›

To determine the owner of an Ethereum wallet address, you can use blockchain explorers like Etherscan or Ethplorer. Simply enter the wallet address to view its transaction history and associated balances.

What is my public Ethereum address? ›

Find your Ethereum address

Now that you have your wallet set up, you can find your Ethereum address. You can open your wallet by clicking the fox icon in the top right corner and that will open your wallet. Now if you click the letters and numbers that start with "0x...." and copy that -- that is your address.

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How do I find my Ethereum token address? ›

The first way to find a token contract address is through an explorer:

Go to the relevant blockchain explorer (Etherscan for ERC-20 tokens, or BSC-scan for BEP-20).
Enter the token name into the search to see a list of tokens with similar names. ...
Click on the contract address at the top to copy it to your clipboard.

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How do I get a named ETH address? ›

To register a . eth domain, you need to create a cryptocurrency wallet (if you don't have one), bid on your desired domain, reveal your bid after the auction, finalize the auction, and then set up the resolver by linking your domain to your wallet address.

Learn More ›