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Solana validators face BLS key deadline before VAT enforcement this week

Solana validators face BLS key deadline before VAT enforcement this week

Validator registration for the Alpenglow upgrade is underway as Solana prepares a staged mainnet rollout from August through October aimed at sharply reducing finality times.

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Fact Check
The official Solana Foundation page 'BLS Pubkey and the Validator Admission Ticket' and the Solana Developers X post confirm that BLS pubkey registration is live and VAT (SIMD-0357) mainnet activation is scheduled for the week of July 20, 2026, which matches the 'this week' framing given the collection date of 2026-07-21. Validators without a registered BLS pubkey lose consensus participation, confirming the 'deadline before VAT enforcement' claim. The Alpenglow page confirms a staged rollout targeting sharply reduced finality (~150ms vs 12.8s TowerBFT), with phases through Q3 2026 and full Alpenglow consensus expected around October 2026. The article's 'August through October' phrasing is broadly consistent with the official Q3-to-October timeline, a minor characterization difference rather than a factual error.
Summary

Solana has begun validator registration for its Alpenglow upgrade, adding a broader rollout timeline to the network’s previously announced Validator Admission Ticket, or VAT, requirements. Mainnet deployment is set to begin in stages from August through October, with the upgrade designed to cut block finality to about 150 milliseconds from roughly 12 seconds and improve transaction processing for payments, DeFi and trading services. Validators still need to register a BLS (Boneh-Lynn-Shacham) public key before VAT, identified as SIMD-0357, is enforced during the week of July 20, 2026. Once active, validators without a registered BLS pubkey will be excluded from consensus and will stop earning inflation rewards. The registration gate, SIMD-0387, is already live, while the broader Alpenglow consensus transition remains a separate step.

Terms & Concepts
  • block finality: The point at which a transaction or block is considered irreversible on a network.
  • BLS public key: A Boneh-Lynn-Shacham key used to support aggregated validator signatures.
  • DeFi: Short for decentralized finance, a set of blockchain-based financial applications and services.