Solana has maintained uptime exceeding two years without a major mainnet outage, according to a report from Fidelity's Center for Applied Technology (FCAT) published in October 2026. The network achieved a vote success rate of approximately 99.7% in 2026, and has increased capacity by shortening slot times, the windows in which validators produce blocks.
Despite these operational strengths, the report identifies significant concentration risks that could create systemic vulnerabilities. Approximately 18 validators control enough stake to halt finality—the point at which transactions are settled and irreversible—according to third-quarter 2026 data cited in the analysis.
Concentration Across Multiple Layers
The report flags three additional areas of concern beyond validator concentration:
- Hosting: A single hosting provider controls nearly 29% of total stake, exceeding limits set by the Solana Foundation.
- Geography: Roughly 40% of stake is concentrated in Frankfurt and Amsterdam.
- Client software: About 63% of stake runs Jito-Solana and approximately 26% runs Harmonic, both linked to the dominant Agave codebase.
FCAT notes that common underlying code across these clients could create network-wide vulnerabilities if a flaw emerged in the shared architecture.
Network Activity Growth
The report documents significant growth in blockchain activity on Solana. Tokenized real-world assets grew from approximately $1 billion to $4.4 billion year over year. Stablecoin volume processed on the network exceeded $2 trillion in the first quarter of 2026 alone.
Methodology and Risk Assessment
FCAT emphasizes that network health should be evaluated by stake distribution, geographic spread, and client diversity together, rather than validator count alone. The authors warn that concentration factors could create systemic risk under heavy transaction load, though they do not specify scenarios or probability assessments.
