Comment by EMM_386
4 months ago
One of the links says the following:
> According to crypto security firm Groom Lake, a Safe multisig wallet was deployed on Ethereum in 2019 and on the Base layer-2 in 2024 with identical transaction hashes. Ethereum’s alphanumeric transaction hashes are 64 characters long, so deploying the same smart contract transaction hash twice should be mathematically impossible.
> The same transaction hash appearing on both Ethereum and Base indicates an attacker could have found a way to make a single transaction valid on more than one network or could be reusing crypto wallet signatures or transaction data across networks, pseudonymous Groom Lake researcher Apollo said.
The quote is incorrect. If I deploy the same smart contract to two different EVM chains, from the same wallet, with the same nonce (pretend it's the first transactions I'm doing with this wallet on each chain, so nonce 0), then the transaction hash will be the same on both chains. That's not odd.
The contract address will be the same but the transaction address should be different because transactions include the chainid in them. Otherwise you could easily replay transactions on other chains.