{"id":"double-entry-invariant","text":"Every money movement (initial funding, payment, refund) creates exactly two ledger entries — one debit and one credit — and `verify_ledger_integrity` audits that total debits equal total credits","truth_value":"IN","source":"entries/2026/06/05/payment-system-payment_system.md","source_url":"","source_hash":"","justifications":[],"dependents":["payment-double-entry-guarantees-balance-integrity","payment-ledger-is-fully-auditable"],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"double-entry-invariant","truth_value":"IN","reason":"premise"}]}}