States may define fields of type Party, which encapsulates an identity and a public key. When a state is deserialised from a transaction in its raw form, the identity field of the Party object is null and only the public (composite) key is present. If a transaction is deserialised in conjunction with X.509 certificate chains linking the transient public keys to long term identity keys the identity field is set. In this way a single data rep- resentation can be used for both the anonymised case, such as when validating dependencies of a transaction, and the identified case, such as when trading directly with a counterparty. Trading flows incorporate sub-flows to transmit certificates for the keys used, which are then stored in the local database. How- ever the transaction resolution flow does not transmit such data, keeping the transactions in the chain of custody pseudonymous.