I've seen a variety of questions and answers in this forum about extracting the public key from a signed transaction hash. I am able to get the correct answer from newer transactions, but unable to with older transactions and am curious if anyone has any ideas.


This is the signed transaction I am attempting to generate the public key for. Any help would be appreciated!

1 Answer 1


It essentially comes down to the three methods constructing transactions through the Ethereum history until now.

Below is a piece a tiny bit modified Python script originally published in this gist (full credit should go to the original author) covering the three types.


  • type_0_keys — legacy transactions before EIP-155.
  • type_1_keys — EIP-155 transactions.
  • type_2_keys — EIP-1559 transactions.

Replace NODE_ENDPOINT and TX_HASH with your values. Note also tx["chainId"] = 1 set for the Ethereum mainnet.

import web3
from eth_account._utils.signing import extract_chain_id, to_standard_v
from eth_account._utils.legacy_transactions import serializable_unsigned_transaction_from_dict

w3 = web3.Web3(web3.HTTPProvider("NODE_ENDPOINT"))
tx = w3.eth.get_transaction("TX_HASH")
tx = dict(tx)

type_0_keys = ['chainId', 'gas', 'gasPrice', 'nonce', 'to', 'value']
type_1_keys = ["to",
type_2_keys = ["to",

s = w3.eth.account._keys.Signature(vrs=(

if tx["type"] == 0:
    keys_to_get = type_0_keys
elif tx["type"] == 1:
    keys_to_get = type_1_keys
elif tx["type"] == 2:
    keys_to_get = type_2_keys

if "chainId" not in tx:
    tx["chainId"] = 1

tt = {k:tx[k] for k in keys_to_get}
tt["data"] = tx["input"]

ut = serializable_unsigned_transaction_from_dict(tt)

public_key = s.recover_public_key_from_msg_hash(ut.hash())

if hasattr(public_key, 'to_hex'):
    public_key_hex = public_key.to_hex()
    public_key_bytes = public_key.to_bytes()
    public_key_hex = public_key_bytes.hex()

  • Thank you SO much, I was struggling with this for around a week, and there isn't a great deal of info online (that I could find) about the differences between these types of transactions. This worked! Really appreciate the help. Oct 2, 2023 at 14:05

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