A previous employer used a passport analogy. Your code gets a visa (cryptographically signed) to run in a specific environment for a fixed time. You can renew

A previous employer used a passport analogy. Your code gets a visa (cryptographically signed) to run in a specific environment for a fixed time. You can renew your visa as long as all the assumptions remain true, but once they’re falsified you must create and submit a new build that makes the assumptions true again.