|author||Thien-Thi Nguyen <firstname.lastname@example.org>||2021-02-23 11:05:13 -0500|
|committer||Thien-Thi Nguyen <email@example.com>||2021-02-23 11:05:13 -0500|
new file: frags/taler-payment-cycle.rst
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+The Taler payment cycle involves six parties:
+(d) customer bank,
+(e) exchange bank,
+(f) merchant bank.
+The exchange is the central entity that mediates the wire transfer of real
+currency between (d), (e), (f) by way of "coins", cryptographically secure
+tokens passed between (a), (b), (c).
+There are six steps to a Taler payment cycle.
+In step 1, (a) directs (d) to make real funds available to (b).
+In step 2, (d) does a wire transfer of real funds to (e), fulfilling the
+request from step 1. (b) generates coins corresponding to those real funds;
+these are called the "reserve".
+In step 3, (a) "withdraws" coins, either wholly or partially, from (b). These
+coins are kept in a "wallet" under control of (a). The coins in the wallet
+In step 4, (a) authorizes payment of coins from the wallet to (c). This
+transfers payment coins from the wallet to (c), and change coins from (b) to
+the wallet (unless the payment amount exactly matches the denomination of the
+coins in the wallet).
+In step 5, (c) "deposits" coins into (b). These coins are still anonymous,
+although the transaction itself is not anonymous.
+In step 6, (b) directs (e) to wire transfer real funds corresponding to the
+accumulated deposited coins to (f).
+NB: The Taler payment cycle is part of the Taler payment system, which
+includes also an auditor component, not described here.