Solana, Aptos Move to Harden Blockchains Against Future Quantum Attacks

As quantum computing shifts from theory toward long-term reality, major Layer 1s are taking early defensive steps to future-proof blockchain security.

Key developments

▪ Solana worked with Project Eleven to assess quantum risks and deploy a post-quantum testnet

▪ The testnet evaluates quantum-resistant signatures at the network layer without disrupting performance

▪ Builds on Solana’s earlier Winternitz Vault, an opt-in, hash-based wallet protection

▪ Aptos proposed AIP-137, introducing optional post-quantum signatures via governance

▪ The proposal adds SLH-DSA, a NIST-standard, hash-based signature scheme

▪ Existing signature systems remain default — no forced migration

Why it matters

▪ Quantum computers could one day forge signatures or derive private keys from public keys

▪ While risks are widely seen as decades away, early preparation avoids rushed upgrades later

▪ Tradeoffs include larger signatures and higher verification costs, limiting near-term adoption

▪ Industry consensus: quantum threat is not immediate, but readiness is increasingly expected

Bottom line

Solana and Aptos are positioning themselves as quantum-ready chains, balancing caution with pragmatism. The threat may be distant, but groundwork laid today could define long-term network resilience.

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