SD will have a ledger field (I propose), so safecoin etc. will not have this set unless a user requests a receipt (which would keep the older transaction). Any normal SD type will remove old copies from the chain as it wastes space. So we get efficiency with anonymity. One thing I am not clear on here is the cost of receipts. It seems they will require a payment as they have an additional cost, but that’s a smaller matter really.
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