
Making a blockchain resistant to quantum attacks involves more than upgrading its proof system. The wallets that sign transactions also need protection. This is an important part of what @Starknet is exploring through its post-quantum security strategy. The challenge is as follows. Most traditional crypto wallets rely on elliptic curve signatures to authorize transactions. These methods resist known classical computer attacks, 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 lays the foundation for Starknet's proof architecture, making it considered more resistant to known quantum attacks. But protecting computational proofs does not automatically protect wallet signatures. 2. Flexible account security. Starknet accounts are programmable smart contracts. This means developers can customize how transactions are authorized rather than being limited to a single signature algorithm. This flexibility creates room to adopt post-quantum signature schemes without upgrading the entire network. Progress has also been made beyond theory. In July 2026, an experimental Falcon-512 account demonstrated a post-quantum signed transaction on Starknet mainnet. Falcon-512 uses lattice-based cryptography designed to resist quantum attacks, though this experimental implementation is unaudited and should not be mistaken for production-ready security. 3. What still needs to be done. Challenges remain around legacy cryptographic dependencies, Ethereum-related security assumptions, implementation audits, and transaction costs. Falcon verification is also significantly more expensive than traditional ECDSA verification, so optimization is an important part of this process. StarkWare reports progress in reducing this overhead, but engineering work remains. My view: I think what is interesting is not a claim that Starknet is already fully quantum-resistant. Rather, its architecture provides two important elements: quantum-resistant proof mechanisms and programmable accounts that can adopt new signature methods. The real achievement will be turning this flexibility into affordable, audited, and widely adopted protection. Preparing for future threats is one thing. Making that protection practical for everyday users is the real test. 🔐
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