Fourier hardfork on BNB Chain halves the opBNB block time to 250 milliseconds, improving transaction responsiveness.
opBNB now anchors derivation to finalized layer-1 blocks, while node fixes boost op-geth/op-node stability and sync reliability.
opBNB activated the Fourier mainnet hardfork, cutting block time from 500 milliseconds to 250 milliseconds. The rollout moved from testnet to mainnet at about 03:00 UTC, and Changpeng Zhao said completion followed about an hour later.
Fourier pairs faster blocks with protocol updates that refine finality handling and reduce reorg risk for sequencer operations. Node operators were instructed to upgrade op-geth to version 0.5.9 to stay aligned with the updated rules and client compatibility.
opBNB just completed its mainnet hardfork about an hour ago. Block time reduced from 500 to 250ms.
Keep building, #BNB https://t.co/4JdMgQcE4M
— CZ BNB (@cz_binance) January 7, 2026
The upgrade also changes how opBNB references layer-1 data in deriva
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