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Jenner Upgrade of BSC

Hardfork

Upgrade Timeline

The Jenner upgrade is scheduled at:

  • Testnet: Late October 2026 (exact time to be announced)
  • Mainnet: Late November 2026 (exact time to be announced)

Upgrade BSC Node Before Hardfork

The hard fork release for the Jenner upgrade has not been published yet; the release version and the exact fork times are still to be announced. All BSC nodes (both Testnet and Mainnet) must upgrade to the hard fork release before the hard fork time. Please follow the release notes for the specific version and timing once available.

There are 4 BEPs in Jenner:

  • BEP-702: Compliant Asset Standard on BNB Smart Chain
  • BEP-703: Payment Lane on BNB Smart Chain
  • BEP-706: Millisecond-Precision Block Timestamp Precompile
  • BEP-714: Reduce Initial Backoff Time to 1 Second

Key Highlight

  • BEP-702 introduces CAS20, a protocol-native fungible token standard for compliant assets (stablecoins and tokenized real-world assets), implemented as stateful precompiled contracts rather than deployed bytecode. Compliance controls — transfer policies backed by shared allow/blocklists, per-feature pause, and role-separated mint, burn and seizure — are built into the protocol.

  • BEP-703 reserves a governable fraction (default 5%) of every block’s gas as the Payment Lane, dedicated to payment transactions — bare BNB transfers and transactions to governance-listed payment contracts — so that payments remain includable even when the network is congested by general traffic.

  • BEP-706 adds a precompile that exposes the block timestamp at millisecond precision to smart contracts, enabling on-chain applications that need sub-second timing on BSC’s fast blocks.

  • BEP-714 reduces the initial backup-validator waiting time from 2 seconds to 1 second, shortening the outage window when an in-turn validator misses its slot and improving overall network availability.

  • BEP-675 Enhancements (no hard fork required): the same release ships several robustness improvements to builder-proposed blocks introduced in Pasteur: revoking a builder upon cross-validator bad block evidence, a gRPC SendBidBlock API, rejecting BidBlocks with a zero state root, and persisting BidBlock revocations across restarts, etc.

Upgrade Notice

New flag introduced in this release (no hard fork required, related to the BEP-675 enhancements):

  • --mev.grpc.disable: disables the BEP-675 BidBlock gRPC service (BidBlockService). The gRPC transport is enabled by default when MEV is on; set this flag to opt out. The service port defaults to 8552 (configurable via [Miner.Mev] GRPCPort in config.toml).

No flags or configuration fields are removed in this release. Once the hard fork release is published, a simple binary replacement is sufficient to upgrade; any further notices will be listed in the release notes.