METROPOLIS: ETHEREUM HARD FORK
Ethereum [https://ethereum.org/] is an open-source, public, blockchain-based,
distributed, computing platform featuring smart contract
[http://etherworld.co/topic/131/smart-contract-an-introduction] functionality.
Since its creation, Ethereum has undergone some hardforking
[http://etherworld.co/topic/22/hard-fork-in-ethereum]. The DAO hardfork
subsequently led to other Ethereum forks two times in the fourth