The Quantum Hub tracks @Starknet's post-quantum migration by surface rather than as a single claim. Accounts: a new account can adopt a post-quantum signature verifier without a breaking protocol change. A Falcon-512 account has been demonstrated on mainnet, but it is experimental and unaudited. Existing accounts do not upgrade automatically. Proofs: the STARK proving layer uses hash-based commitments, not elliptic-curve hardness assumptions. Protocol cryptography: two OS hashes changed in Starknet v0.14.3, a live change on Mainnet. The wider protocol migration is still ahead. Ethereum-facing: the bridge and data availability depend on external infrastructure. What I found clearest: the Hub separates what is possible at the account layer from what still depends on wallets and external systems. "The StarkWare Quantum Hub assesses eight capabilities for changing cryptography. Counts reflect public evidence within its defined scope. Source and methodology, checked October 15th 2026." https://t.co/ZsYbZxTEd4 Built to adapt, not a claim of quantum safety. Following @Starknet