How can I validate if a transaction hash is valid using web3.py?

Question

How can I check whether a transaction hash is valid or not using Python [web3.py]?

The answers I found was in javascript, related:

Why can't you just check if the transaction with this hash exists on the chain ? — Itération 122442, Oct 09 '21 at 12:24
I don't want to check if the transaction hash exists on the chain, which will also consumes additional time to check from. — alper, Oct 09 '21 at 22:23
Considering a hash is just a bunch of characters with a specific length (the string), any string with said length is a valid transaction hash. — Itération 122442, Oct 10 '21 at 07:15

alper · Accepted Answer · 2021-10-09T11:58:45.497

With the help of regex at https://ethereum.stackexchange.com/a/34286/4575:

/^0x([A-Fa-f0-9]{64})$/

import re
def is_transaction_valid(tx_hash) -> bool:
    pattern = re.compile(r"^0x[a-fA-F0-9]{64}")
    return bool(re.fullmatch(pattern, tx_hash))
tx_hash = "0xd65dc6bf6dcc111237f9acfbfa6003ea4a4d88f2e071f4307d3af81ae877f7be"
if is_transaction_valid(tx_hash):
    print(f"{tx_hash} is an valid transaction.")
else:
    print(f"{tx_hash} is NOT a valid transaction.")

How can I validate if a transaction hash is valid using web3.py?

1 Answers1