EIP-1702: Generalized Account Versioning Scheme #1702
Merged
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This was originally designed for Ethereum Classic around 2017 (ethereumproject/ECIPs#86). As I saw there're some interests in using account versioning on Ethereum, I thought I would just submit an EIP here.
Abstract
This defines a method of hard forking while maintaining the exact functionality of existing account by allowing multiple versions of the virtual machines to execute in the same block. This is also useful to define future account state structures when we introduce the on-chain WebAssembly virtual machine.
Motivation
By allowing account versioning, we can execute different virtual machine for contracts created at different times. This allows breaking features to be implemented while making sure existing contracts work as expected.
Note that this specification might not apply to all hard forks. We have emergency hard forks in the past due to network attacks. Whether they should maintain existing account compatibility should be evaluated in individual basis. If the attack can only be executed once against some particular contracts, then the scheme defined here might still be applicable. Otherwise, having a plain emergency hard fork might still be a good idea.