Signature Type: A signature along with supporting context. The signature may be a digital signature that is cryptographic in nature, or some other signature acceptable to the domain. This other signature may be as simple as a graphical image representing a hand-written signature, or a signature ceremony Different signature approaches have different utilities.

Signature
type
Indication of the reason the entity signed the object(s)
when
When the signature was created
who
Who signed
onBehalfOf
The party represented
targetFormat
The technical format of the signed resources
sigFormat
The technical format of the signature
data
The actual signature content (XML DigSig. JWS, picture, etc.)