Deleting a Subject
To delete/retract an entire subject, use the _id key along with only "_action": "delete". This deletes (retracts) the subject all predicates. In addition, all of the references for that subject anywhere in the ledger are also retracted.
"_id": ["person/handle", "jdoe"],
Write a transaction
Using the above transaction example, write a transaction deleting the subject with id 12345.