self addressing data

Definition

an identifier that is content-addressable and self-referential. A SAID is uniquely and cryptographically bound to a serialization of data that includes the SAID as a component in that serialization SAID.
Source: Dr. S. Smith

Explanation

While all KERI event messages are self-addressing data (SAD), there is a broad class of SADs that are not KERI events but that require signature attachments. ACDC Verifiable credentials fit into this class of SADs. With more complex data structures represented as SADs, such as verifiable credentials, there is a need to provide signature attachments on nested subsets of SADs.
(Philip Feairheller, ietf-cesr-proof)