# 0x01 receive payable Investigation as to which 0x01 credentials deployed *today* are relying on critical `payable` functionality (if any). The [spec](https://github.com/ethereum/consensus-specs/blob/dev/specs/phase0/validator.md#eth1_address_withdrawal_prefix) is written such that it *would* hit EVM execution, but "push" designs are opened up if we bypass that. All eth1 withdrawal addrs as of 22/2/22 -- https://gist.github.com/djrtwo/6c77383c3321372b3166b615d6bb2766 Non-rocketpool deployed code -- https://gist.github.com/djrtwo/f3deb53873862daa216d897c6e64b918 [toc] ## Investigation ### Method On 22/2/22 steps: * pull down all `validators` from lighthouse node * filter `0x01` withdrawal credential addresses * `sort` and `uniq` the set * use `geth` node to call `getCode` on each * identify the majority use same code -- RocketPoolMiniPool -- remove this code and addrs from the set * manually review remaining ### Results **The 0x01 addrs deployed today consist of the following:** * Most (~3k) are rocketpool minipool's with the following [bytecode](https://etherscan.io/address/0xfc47978daaf266f8c4bcec37e775bf7522496722#code): ``` 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``` * Some are stakefish contracts which seem to not have special logic on `receive` -- https://etherscan.io/address/0xb89fb4ffc1fc926e13c4ce9c895d1df81428388d#code * One is a gnosis safe -- https://etherscan.io/address/0xfe80804d2e3ab78a13ce90f45b2803cf9bbd1f51#code * The rest are EOAs (or counterfactual contracts that we can't see) ## Project investigation ### Lido Discussed with some Lido leadership that they don't yet have any 0x01 credentials deployed. > We can work with that. it'll be harder to track exact validators that do withdrawals but I expect we'll have to move this kind of tracking off L1 anyway so it's not a huge consideration ### RocketPool [sample contract](https://etherscan.io/address/0xfc47978daaf266f8c4bcec37e775bf7522496722#code)  Has receive() logic to emit a receipt but doesn't seem critical and this contract is fully upgradeable