ethereum.byzantium

The Byzantium fork reduces the mining rewards, delays the difficulty bomb, lets contracts make non-state-changing calls to other contracts, and adds cryptographic primitives for layer 2 scaling.

FORK_CRITERIA

9
FORK_CRITERIA = ByBlockNumber(4370000)

ethereum.constantinople

The Constantinople fork reduces mining rewards, delays the difficulty bomb, and introduces new EVM instructions for logical shifts, counterfactual contract deployment, and computing bytecode hashes.

FORK_CRITERIA

9
FORK_CRITERIA = ByBlockNumber(7280000)