ethereum.berlin

The Berlin fork adjusts the gas costs of the ModExp precompile and several state access EVM instructions, introduces typed transaction envelopes along with the first new transaction type—optional access lists.

FORK_CRITERIA

9
FORK_CRITERIA = ByBlockNumber(12244000)

ethereum.london

The London fork overhauls the transaction fee market, changes gas refunds, reserves a contract prefix for future use, and delays the difficulty bomb.

FORK_CRITERIA

8
FORK_CRITERIA = ByBlockNumber(12965000)