EIP-712: eth_signTypedData as a standard for machine-verifiable and human-readable typed data signing

[Amxx]

@PhABC

Can’t we simply re-use the EIP-712 hashStruct for byte arrays? So long as one of the contract down the line can interpret this embeded hashStruct, the original contract called doesn’t need to know what this hashStruct is. It will simply take the hash of that byte array before doing an EIP-712 hash, like specified in the spec and can then pass that bytes array to another contract, which understands what the structure of that bytes array is.

Reusing the logic of byte arrays for uint[], bytes32[] or any other array of “native types <= 1 word” is ok, but it goes against the whole proposal for arrays of struct (such as a Recipient[] where Recipient would be a struct with multiple entries).

I believe the logic would be to hash each entry, turning the Recipient[] into a bytes32[] and then hashing the bytes32[]. The drawback is that this cannot be done in place.

In the end, it’s pointless what I believe the logic should or should not be, as long as we have ONE way to do it that is part of the standard