Source views: Source JSON(ish) on GitHub (VSCode)   Doc views: Document (&k=5.sec): Visual Print Technical: OpenParameters Xray
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.