A server includes a processor that receives, from a first device, initiation message(s) each including a service identifier and a service value and, for each initiation message, saves in a database a record comprising the service identifier in association with the service value. The processor receives, from a second device, authorization message(s) each including one of the service identifiers and an authorization value, and for each authorization message, validates one of the initiation messages by (i) locating in the database the record comprising the one service identifier, and (ii) confirming that the service value in the located database record matches the authorization value. The processor updates a journal with an entry identifying a transfer between a first ledger and a second ledger in an amount equal to a sum of the service values of the validated initiation messages, and provides the first device with a message confirming the transfer.