BNB Chain activates Pasteur hard fork on BSC mainnet
BNB Chain has activated the Pasteur hard fork on the BNB Smart Chain (BSC) mainnet at 02:30 UTC on Aug. 25, 2026, combining BEP-682, BEP-695 and BEP-675 under the broader BEP-673 plan.
The BNB Chain upgrade focuses on three areas. First, BEP-682 strengthens bridge security by rejecting duplicate validator entries during cross-chain light-block verification, ensuring each supermajority approval comes from distinct validators. This reduces the risk of crafted requests overstating bridge approval support. BNB Chain said it did not attribute any prior asset losses or report an active exploitation.
Second, BEP-695 improves validator-key rotation controls by ensuring old operator keys lose management rights and cannot evade pending penalties. It also blocks restricted addresses from participating via offchain governance signatures by checking the original signer.
Third, BEP-675 adds an optional block-building route that can reduce duplicate execution work. BNB Chain said QANet testing increased throughput 88% from 1,237 to 2,324 TPS, while average gas per block rose from 46.35M to 84.15M under an unchanged 100M gas limit. Importantly, Pasteur does not change the 450-millisecond block interval.
For deployment, node operators needed client version 1.7.7 and had to remove the deprecated EnableBAL field before activation to avoid falling out of sync. The next validation for traders is live block utilization and sustained transaction throughput after the Pasteur hard fork on BSC mainnet.
Neutral
Impact is likely neutral for trading because the Pasteur hard fork is primarily a security and efficiency upgrade rather than a token-economic change.
On the bullish side, improved bridge verification (BEP-682) and tighter validator-key/governance controls (BEP-695) can reduce tail-risk for BSC users, which often supports sentiment around the network after successful mainnet activation. The reported QANet performance gain from the BEP-675 block route also suggests potential for higher transaction capacity without changing the 450ms block time.
However, expectations may take time to materialize. The throughput figures were produced in controlled testing, and traders will need to confirm real-world outcomes such as sustained TPS, block utilization, and missed-block rates after the Pasteur hard fork on BSC mainnet. Historically, major L1/L2 upgrades can cause short-term volatility around synchronization windows, but absent a new incentive or supply change, sustained upside for BNB is less direct.
Therefore, unless there is evidence of post-upgrade performance issues or unexpected security findings, the market reaction is more likely to be muted and sentiment-driven rather than directional.