
Making a blockchain resistant to quantum attacks involves more than upgrading its proof system. The wallets signing transactions need protection too. This is an important part of what @Starknet is exploring with its post-quantum security strategy. Here’s the challenge. Most traditional crypto wallets depend on elliptic curve signatures to authorize transactions. These methods are secure against known attacks from classical computers, but a sufficiently powerful quantum computer could use Shor’s algorithm to break the underlying cryptographic assumptions. Starknet is exploring protection through two important design choices. 1. STARK-based proof system Unlike many proof systems that rely on elliptic curve cryptography, STARKs use hash-based cryptographic assumptions. This gives Starknet’s proving architecture a foundation considered more resistant to known quantum attacks. But protecting computation proofs doesn’t automatically protect wallet signatures. 2. Flexible account security Starknet accounts are programmable smart contracts. This means developers can customize how transactions are authorized instead of being restricted to one signature algorithm. That flexibility creates room for post-quantum signature schemes without requiring an entire network upgrade. There has also been progress beyond theory. An experimental Falcon-512 account demonstrated a post-quantum-signed transaction on Starknet mainnet in July 2026. Falcon-512 uses lattice-based cryptography designed to withstand quantum attacks, although the experimental implementation was unaudited and shouldn’t be mistaken for production-ready security. 3. The work still ahead There are challenges around legacy cryptographic dependencies, Ethereum-related security assumptions, implementation audits, and transaction costs. Falcon verification is also significantly more expensive than conventional ECDSA verification, making optimization an important part of the process. StarkWare has reported progress in reducing that overhead, but there is still engineering work to do. My takeaway: I don’t think the interesting part is claiming that Starknet is already fully quantum-proof. It’s the fact that its architecture provides two important ingredients: quantum-resistant proving and programmable accounts that can adopt new signature methods. The real achievement will be turning that flexibility into affordable, audited and widely adopted protection. Preparing for future threats is one thing. Making that protection practical for everyday users is where the real test begins. 🔐



