BNB Chain has scheduled the Jenner hardfork for its BSC Chapel testnet, introducing protocol-level infrastructure for payment prioritization, compliant digital assets and more precise smart-contract timing. Jenner will activate on the testnet on October 29 at 02:30 UTC, with all affected node operators required to upgrade before the fork.
According to the official BNB Chain Jenner documentation, the upgrade combines BEP-702, BEP-703 and BEP-706. The three proposals respectively introduce the CAS20 asset standard, a dedicated Payment Lane and millisecond-resolution timestamps for smart contracts, while the accompanying client release also includes improvements to block-builder infrastructure introduced under Pasteur.
The hardfork follows the Pasteur mainnet upgrade, which focused on cross-chain security, validator governance and block-building infrastructure. Jenner shifts the emphasis toward how specific financial transactions and assets are handled directly at the protocol level, rather than simply increasing network throughput.
Payment Lane Reserves Block Capacity During Congestion
BEP-703 introduces a Payment Lane that reserves 5% of each block’s gas capacity by default for qualifying payment transactions. Eligible activity includes standard BNB transfers and transactions sent to payment contracts included on a governance-controlled list.
The allocation is designed to preserve transaction inclusion when general blockspace becomes congested. Both the 5% allocation and the list of eligible payment contracts can be changed through governance, making the mechanism configurable rather than permanently assigning a fixed portion of BSC capacity to payments.
The change arrives as BNB Chain continues promoting stablecoin settlement through initiatives such as its zero-fee transfer campaign for selected stablecoins. The Payment Lane is structurally different from those subsidies because it operates at the block-allocation level rather than reimbursing or eliminating fees on selected transfer routes.
Jenner also introduces BEP-706, which exposes millisecond-level block timing through a new precompile at address 0x70. Existing block.timestamp behavior remains measured in seconds, meaning applications that need sub-second precision must explicitly use the new mechanism rather than receiving higher-resolution timestamps automatically.
CAS20 Adds Protocol-Native Controls for Tokenized Assets
BEP-702 introduces CAS20, a protocol-native fungible token standard aimed at stablecoins and tokenized real-world assets. CAS20 supports shared allowlists and blocklists, transfer policies, pausing and separate mint, burn and seizure roles directly through BSC stateful precompiles, rather than requiring every issuer to recreate those controls in custom token bytecode.
The standard retains compatibility with familiar BEP-20 selectors and transfer events, allowing existing wallets, indexers and decentralized exchanges to interact with CAS20 assets. Existing BEP-20 tokens are unaffected by Jenner and do not need to migrate to the new standard.
CAS20 infrastructure becoming active at the hardfork does not mean issuers can immediately deploy compliant assets without additional governance action. Token creation requires separate activation by a governance-appointed administrator, leaving the technical capability and its operational availability as distinct milestones.
The functionality fits BNB Chain’s broader expansion into tokenized assets, where stock-linked products and other RWAs have already gained meaningful on-chain distribution. Protocol support for compliance controls can simplify future issuance infrastructure, but it does not itself establish regulatory approval or demand for any asset created through CAS20.
All Chapel testnet operators using the BSC client must move to v1.8.1 before activation, while the equivalent Reth-based implementation is available through v0.1.3. The testnet deployment will provide the first live environment for evaluating Jenner’s consensus changes before BNB Chain proceeds toward its planned late-November mainnet phase.
Jenner therefore represents a different type of infrastructure upgrade from the earlier Osaka/Mendel execution changes. Rather than delivering a headline throughput increase, the hardfork modifies how BSC allocates scarce blockspace, exposes time to applications and supports regulated-style token controls at the protocol level.
Liam Foster follows crypto markets from France, with a close eye on Bitcoin, Ethereum, Layer 1 assets, derivatives, sentiment and smart money flows. His coverage looks past the daily price move to understand what is happening underneath: liquidity, leverage, positioning and the behavior of larger players.
Liam’s style is calm, sharp and deliberately anti-crystal-ball. He does not frame every market move as a breakout or collapse. Instead, he focuses on what the data can actually support, where traders may be crowded and when a signal deserves attention without becoming a prediction.