{"id":"wallet-currency-immutable-after-creation","text":"Currency is immutable after wallet creation; `transfer` checks currency match before acquiring locks, which is safe because the field never changes.","truth_value":"IN","source":"entries/2026/06/05/digital-wallet-wallet.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"wallet-currency-immutable-after-creation","truth_value":"IN","reason":"premise"}]}}