$SOL Solana is collaborating with Project Eleven to test quantum resistant signatures.

Early results highlight significant trade-offs: the new signatures are up to 40× larger than current ones, and the network experienced roughly 90% slower performance in testing. This raises important questions about scalability for a high-throughput blockchain like Solana.
Why it matters
Quantum threat: Future quantum computers could potentially break today's widely used cryptography (like Ed25519 on Solana), exposing wallets, validators, and transactions.
The experiment: Project Eleven helped build a dedicated testnet running post-quantum signatures end-to-end to assess real-world feasibility.
The challenge: Larger signatures increase bandwidth and storage demands, while slower verification processing hits throughput hard key concerns for Solana's speed-focused design.
This is still early,stage testing (as of April 2026 reports). Future optimizations in algorithms, compression, or hybrid approaches could reduce the impact. It's a proactive step toward long term security, but it shows the difficult balance between quantum safety and performance that many blockchains will face.