If this key is included and the value is truthy, this update is an agreement. The value may include serialisable proof that applicable agreement conditions have been met, such as a key to a ledger entry.
Partial subjects, containing properties that have been deleted from the domain. Note that deletion of a property (even of all properties) does not necessarily indicate that the subject's identity is not longer represented in the domain.
Partial subjects, containing properties that have been inserted into the domain.
An identified security principal (user or machine) that is responsible for this update.