opBNB activates the Fourier mainnet hardfork

The opBNB network has completed its mainnet hardfork that began on early Tuesday morning on its testnet. The Fourier Mainnet hardfork was then shifted to the mainnet at around 03:00 UTC on Wednesday, which ex-Binance CEO Changpeng Zhao confirmed was completed one hour later.

According to the opBNB network upgrade’s notes on GitHub, the Fourier hardfork has halved block time from 500 milliseconds to 250 milliseconds and implemented several changes to improve stability, finality handling, and node performance.

opBNB is a layer-2 Ethereum Virtual Machine (EVM) compatible network built using the OP Stack that scales applications on the BNB Chain. The blockchain has a 100-million-gas block size and consistently low transaction fees focused on high throughput.

Fourier upgrade cuts down block interval and fixes p2p node derivation 

As lauded by Zhao in an X post earlier today, the main change delivered through the Fourier hardfork was the implementation via pull request #305, which reduced the block interval by half. Cutting block time to 250 milliseconds means opBNB will increase transaction processing speed and responsiveness for applications deployed on the network. 

The shorter block interval also reduces confirmation times to make interactions feel closer to real-time for users and developers. Still, node operators were instructed to upgrade op-geth to version 0.5.9 to uphold the blockchain’s compatibility with the new protocol rules. 

Another change came through pull request #319, which reworked how the network handles layer-1 references used by the sequencer and derivation logic. Rather than relying on the latest layer-1 head, opBNB now uses finalized layer-1 blocks as the reference point.

This adjustment addresses expected changes on BNB Smart Chain, where block times are set to fall to 450 milliseconds. Validators are capable of producing up to 16 consecutive blocks under the new conditions. However, bigger reorganizations would require higher confirmation thresholds for both verifiers and sequencers that may delay deposit transactions by several minutes.

According to BNB developer Joey Chang, the Fourier hardfork also bundled some fixes impacting node reliability by adding support for compiling opBNB with Golang version 1.24.x and compatibility for Windows operating systems.

Pull request #324 fixed an error in block number computation that could happen during prolonged shutdowns, where long stops will now be finalized correctly upon restart. If a node was stopped for an extended period, restarting could lead to incorrect block calculations.

The hardfork resolved an issue affecting nodes running op-geth in fastnode mode that prevented it from keeping full state data. When the op-node attempted to derive new blocks using the engine API, it could encounter an empty block root due to missing state information. 

The failure caused the op-node main loop to exit and stop block synchronization, but the fix would make sure that in fastnode mode, op-node waits for unsafe blocks from the peer-to-peer network, not requesting block derivation from op-geth.

More fixes included resolving a concurrent map usage issue in reference metrics through pull request #326 and adding the Fourier hardfork timestamp to mainnet parameters via pull request #328.

BNB Chain records 40% TVL increase in 2025, token holds onto $900 level 

The opBNB upgrade comes against the backdrop of an activity-packed year for the Binance chain ecosystem, which counted a 40.5% year-over-year rise in TVL and daily transaction volume of 10.78 million, according to its end-of-2025 report. 

Unique addresses on BNB Chain surpassed 700 million, and both BNB Smart Chain and opBNB averaged more than four million daily active users. The blockchain’s native token, BNB, recently broke above the $910 resistance zone, scaling upwards by almost 2% to trade above $920 as the rest of the crypto market continues to recover.

At the time of this reporting, BNB is up by 5% in the last seven days, 33% adrift from its $1,370 all-time-high price level achieved last October. BNB reached an intraday high of $921.47, but a price correction dragged its price back to levels below the next technical resistance of $918.

The price move comes ahead of the planned Fermi hardfork scheduled for January 14, which is expected to lift BNB Chain’s capacity to 20,000 transactions per second. 

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