Who controls it
- Transaction ordering
- Leader schedule across the validator set; no single operator
- Escape hatch
- None needed: Solana is an L1.
- Upgrade authority
- No admin key controls user funds. Validators adopt client software upgrades by social consensus.
- Halts and outages
- The last confirmed major halt was on 2024-02-06, when a program-execution bug stopped the chain for about 5 hours. Since then Solana has run for 22+ months, with 100% uptime year to date as of March 2026. Frankendancer (Firedancer networking with Agave execution) has run on mainnet since 2025. Once Firedancer passes about 25-30% of stake, a single client bug can no longer halt the network. Concentration is moving the other way. Validators fell from about 2,560 (Mar 2023) to about 795 (Jan 2026), a 68% decline, and the Nakamoto coefficient fell from 31 to 20. Validators remain spread across 45+ countries and multiple hosting providers.
Ketju assessment
Ketju approves Solana with limits: no admin key can seize client funds and the chain has not halted since February 2024, but validator concentration has worsened. The last major outage was nearly two and a half years before this review. The fix for client-bug halts has shipped, because multi-client execution is live on mainnet. Ketju treats twenty-two-plus months of uptime as a real record. Liveness and decentralisation are different measures, and on Solana they are moving in opposite directions. Liveness has improved; validator concentration has worsened. The limits reflect that split, and the falling operator count is the trend to follow. This verdict lets Ketju judge Kamino, Jito and the Jupiter venues on their own merits.
Review triggers
- Any full-network halt requiring coordinated restart
- Nakamoto coefficient falling below 15
- Validator count falling below 600
- Firedancer adoption stalling below 25% of stake
Each trigger names a fact anyone can observe. If one occurs, Ketju will review the assessment again. None is a forecast.
Questions before use
- Does the client’s thesis require censorship resistance, or primarily low-cost settlement?
- Can the client withdraw without help from the party that normally orders transactions?
- Who can upgrade bridges or contracts, and what delay applies?
- Does the asset introduce an issuer weaker than the chain grade?
- What evidence will show a halt, censorship event, or governance change?