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Kaia Hard Fork History

This page shows all the hard forks to the Kaia blockchain.

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• For more details on Kaia releases, see the Kaia Release Notes on GitHub.
• For hard forks prior to the Kaia transition, refer to the Klaytn Hard Fork History.

Prague

	Kairos	Mainnet
Date	Jun 10, 2025 10:26 / UTC+9	Jul 17, 2025 10:26 / UTC+9
Block number	#187,930,000	#190,670,000

Summary

Prague hardfork was introduced with the v2.0.0 release for Kairos testnet and v2.0.2 release for Mainnet. It introduces BLS12-381 precompiles as per EIP-2537, historical blockhash system contract as per EIP-2935, contract creation check as per EIP-7610, updated calldata gas price as per EIP-7623 and KIP-223, SetCode transaction type as per EIP-7702 and KIP-228, and the Consensus Liquidity feature as per KIP-226. Additionally, it includes Gas Abstraction feature for paying gas fees with tokens.

Kaia Transition

	Kairos	Mainnet
Date	Jun 13, 2024 10:13 / UTC+9	Aug 29, 2024 10:29 / UTC+9
Block number	#156,660,000	#162,900,480

Summary

Kaia Transition hardfork was introduced with the v1.0.0 release for Kairos testnet and v1.0.2 release for Mainnet. This hardfork marks the transition from Klaytn to Kaia blockchain. It includes TreasuryRebalanceV2 hardfork and token allocation contracts according to KIP-160, transaction priority fee (tip) as per KIP-162 similar to EIP-1559, validator's PublicDelegation and CnStakingV3 contracts as described in KIP-163, and modified staking update interval to 1 block.