Starknet’s approach to quantum threats: Don’t bet on which algorithm will win—ensure you can switch at any time. When discussing quantum security, people often ask, “Which signature is the most secure?” But a better question is: When the day comes that you must switch signatures, will your account be able to do so? @Starknet’s approach is to make security upgradeable. Layer 1: Proof Layer STARK proofs are based on hash functions and do not rely on elliptic curve assumptions. Their quantum resistance is built in from the ground up—not added later. Layer 2: Account Layer Every account on Starknet is a smart contract (native account abstraction). How signatures are verified is determined by contract code, not hardcoded into the protocol. This means: ✅ Switching signature schemes requires no hard fork ✅ Your address, balance, and transaction history remain unchanged ✅ Every user and institution can migrate at their own pace 📍 Current Progress (by status) 🟢 Mainnet Live: Post-quantum accounts have already been deployed on mainnet 🟢 Ready-to-deploy Solutions: OpenZeppelin has released a post-quantum account contract based on Falcon-512 🟡 Developer Demo: S2morrow has implemented Falcon-512 in Cairo and demonstrated a functional account 🔴 Still in Progress: External dependencies like settlement, data availability, and cross-chain bridges still rely on elliptic curve cryptography ⚪ Research Phase: Independent L1 migration is currently only theoretical; actual migration requires binding governance votes ⚠️ Important Clarification: This does not mean Starknet is fully quantum-safe today. Instead, it’s proactively building upgradeable infrastructure—preparing now, before the need becomes urgent. No one knows when the next cryptographic breakthrough will arrive. But upgradeable security answers a different question: When the time comes, can you switch smoothly—on your own terms? 🛡️