Method to check if a chainID is valid at a specific block Number

Status history

1. Draft20 Apr 2019
2. ⋯Stagnantdate not observed

Abstract

This EIP adds a precompile that returns whether a specific chainID (EIP-155 unique identifier) is valid at a specific blockNumber. ChainID are assumed to be valid up to the blockNumber at which they get replaced by a new chainID.