The actual signature content (XML DigSig. JWT, picture, etc.)
Additional Content defined by implementations
xml:id (or equivalent in JSON)
The party represented
The technical format of the signature
The technical format of the signed resources
Indication of the reason the entity signed the object(s)
When the signature was created
Who signed
Generated using TypeDoc
A digital Signature - XML DigSig, JWT, Graphical image of signature, etc.