2017-0001: Generalized Account Versioning Scheme for Hard Fork

[sorpaas]

Discussion thread for 2017-0001.

[sorpaas]

Related ECIP-1040: ethereumproject/ECIPs#86

[ellaismer]

I like how this can push Ellaism's immutability property to Bitcoin level. Unlike UTXO, plain account model is more easily mutated. Having a higher standard is great. At the same time, while I agree that this already seems simple enough, I still think we should review the design in more detail to avoid any unnecessary complexity.