EIP-695: clarify what happens if a chain initially does not have chain ID or chain ID has changed #2625
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This addresses https://ethereum-magicians.org/t/eip-695-create-eth-chainid-method-for-json-rpc/1845/19
We clarify that chain ID returned should always be corresponding to the head block. This is also how OpenEthereum currently implements it. The rationale is that by doing this we ensure caller can always use the retrieved information to sign transactions on top of the head.