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Solana Activates Prerequisites for Alpenglow Upgrade on Mainnet

Central Solana validator node with a glowing BLS key badge in front of a digital gate and network lines.

Solana has reached a critical technical milestone in its transition toward the Alpenglow consensus mechanism. This week, the network is activating the Validator Admission Ticket (SIMD-0357), commonly referred to as the VAT feature gate, on the mainnet beta.

The activation follows the launch of SIMD-0387, which allowed validator operators to register a BLS public key on-chain. According to Solana Developers, registering this key is a mandatory prerequisite for the upcoming Alpenglow consensus protocol. With the VAT feature gate now going live, the network will begin enforcing new requirements for validator participation.

Impact on Validator Operations

The VAT activation introduces a strict compliance check for the nodes that secure the Solana network. While the full Alpenglow upgrade is still months away, the VAT serves as an administrative gatekeeper. Validators who have not registered their BLS public keys risk being excluded from the consensus process.

Currently, the VAT mechanism enforces the following:

  • Consensus Participation: Once the feature gate is active, any validator without a registered BLS public key will be unable to participate in voting.
  • Inflation Rewards: Nodes that fail to meet the registration requirement will stop earning protocol inflation rewards, as they are no longer contributing to the network’s consensus.
  • Admission Limits: Prior to the full transition to Alpenglow, the VAT system is expected to cap the active validator set at 2,000 nodes, prioritized by stake weight.

The Road to Alpenglow

The Alpenglow upgrade represents a significant shift in how Solana handles validator incentives and network admission. Once fully enabled, the system will move away from current voting cost structures in favor of a flat fee of approximately 1.6 SOL per epoch. In a departure from existing fee redistribution models, these VAT fees will be burned directly, reducing the overall supply of SOL rather than being redistributed to block proposers.

The Solana Foundation previously indicated that this phase of the roadmap focuses on ensuring infrastructure readiness. While the feature gates are now activating on mainnet, the broader Alpenglow consensus switch is scheduled to land with future releases of the Agave validator client.

Validator operators are urged to confirm their BLS public key registration status immediately to avoid being cut from the consensus set during the current epoch transition.