The journal is data that is ancillary data to the main fungible data. It may or may not be implemented using a separate ledger and it may exist within another DIDO network, but its care and maintenance does not have to be part of the ledger’s transactions. For example, the monetary exchange rate between two currencies is ancillary to a cryptocurrency ledger; however, the almost instantaneous updates to the exchange rate would not be appropriate in the cryptocurrency ledger itself.