🔐 SECURITY: USDC runs across 37 mainnets, and Circle can’t upgrade every wallet, bridge or host chain itself.

A post-quantum migration only works if each layer can rotate keys and retire vulnerable signatures. The 813 logical-qubit figure shows progress in attack design—not a Q-day deadline.

https://cryptoslate.com/usdc-may-be-only-as-quantum-safe-as-its-slowest-wallet-bridge-or-blockchain/

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