A gas storage contract minted by CKBirthBot, a gas token derivative used by CryptoKitties-era bots to optimize transaction costs.
Historical Significance
CKBirthBot and its 282K child contracts are a direct artifact of the CryptoKitties congestion crisis of 2017-2018, when breeding bots competed so intensely for block space that specialized gas optimization infrastructure was built.
Token Information
Key Facts
Description
These contracts are child storage units minted by CKBirthBot (0x00000000a8f806c754549943b6550a2594c9a126), a gas token contract specialized for CryptoKitties birthing bots. Like GasToken2, it worked by storing EVM state cheaply using SSTORE opcodes during low-gas periods, then reclaiming the gas refund through SELFDESTRUCT when executing expensive operations like breeding or birthing CryptoKitties. Over 282,000 such child contracts were minted. The CryptoKitties craze of late 2017 to 2018 drove intense gas optimization activity, and purpose-built gas token variants like CKBirthBot emerged to help bot operators compete.
Byzantium Era
First Metropolis hard fork. Added zk-SNARK precompiles, REVERT opcode, and staticcall.