the clever part of a security upgrade isn't always what changes. sometimes it's what stays unchanged. @Starknet's account architecture separates two responsibilities: __validate__ decides whether a transaction is authorized. __execute__ carries out the approved actions. the protocol still enforces nonces, fees and validation resource limits. this separation matters for quantum migration. an account can replace its signature verifier while preserving its address, assets and transaction execution model. but programmable validation isn't unlimited freedom. a flawed replacement verifier could undermine authorization, while expensive post-quantum signatures must still fit execution constraints. the Bunker Checklist's account-change capability is evidenced on mainnet. secure, widely adopted post-quantum wallet migration remains unfinished. to me, cryptographic agility is about changing one security assumption without unnecessarily destabilizing everything around it. that's a stronger engineering story than simply claiming quantum resistance. https://t.co/LVKEmrLK0T #KaitoAI