/Docs/S/About/Pitch/Support/DRY_Transacting_v0.md
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A preferred way to synchronize is to exchange (lists = lists)
via payment systems, where signature and transfer of value is handled by the payment system. Payment systems give receipts which have key=values that can be used to record and reference (lists = lists)
. More advanced payment systems such as blockchains may automate transaction flows and conditions.