Anza Unveils Agave v4.3 Upgrade Plan, Featuring Alpenglow Consensus and New Syscalls

Anza, the core development team behind the Solana ecosystem, has published the release plan for Agave v4.3, the validator client upgrade that will introduce several notable enhancements. The planned features include the Alpenglow consensus protocol, new system calls for SHA512 and big-integer modular exponentiation, and an increased CPI (cross-program invocation) depth. According to the preliminary schedule, the testnet is expected to begin recommended node upgrades on August 17, followed by feature activation on August 24. On the Beta mainnet, volunteers will be recruited on September 8 to move 10% of staked SOL to v4.3, with an additional 25% targeted on September 14. September 21 is set as the suggested date for full Beta mainnet adoption, and feature activation would start on September 28. The team emphasized that all dates are tentative and subject to change. This staged rollout aims to allow validators and stakeholders to prepare gradually, reducing potential disruption during the upgrade process.