Byzantium Era

First Metropolis hard fork. Added zk-SNARK precompiles, REVERT opcode, and staticcall.

2017-10-16 to 2019-02-28

Blocks 4,370,000 to 7,279,999

50 documented contracts

A CryptoKitties birth bot that earns midwife rewards while deploying self-destructing child contracts for gas refunds.

A gas storage contract minted by CKBirthBot, a gas token derivative used by CryptoKitties-era bots to optimize transaction costs.

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