EIP-6493: SSZ Transaction Signature Scheme

Changes for EIP-4844 proposed:

Another open question would be whether we want to use a plain 65 byte array in EIP-4844 for the signatures, same as in the EIP-6493 example. Personally, I don’t see too much value in putting separate y/r/s components into the SSZ object, as they are always processed together (except for legacy tx which is not ssz where y can have chain id). It could also avoid the nasty byte swap (SSZ is little endian, but cryptography libs expect big endian).