Σ of every materialized account balance.
Whether supply === accountTotal + circulatingCoin.
supply − accountTotal — cash in existence (held outside accounts).
Σ face value of coins NOT resting in a bank vault.
Σ mints − Σ drains over the central-bank log.
The conservation audit — the reconciliation invariant. Top-down minted supply must equal bottom-up (Σ account balances + Σ circulating coins, the coins outside bank vaults).
cashInExistence = supply − accountTotalis the cash-in-hand figure even though cash transactions are off-ledger.