Update DataIntegrityProof to reference Data Integrity spec for proper…

…ties.

index.html

@@ -427,6 +427,11 @@ <h2>Proof Representations</h2>
         <section>
           <h3>DataIntegrityProof</h3>
 
+          <p>
+A proof contains the attributes specified in the
+<a href="https://www.w3.org/TR/vc-data-integrity/#proofs">Proofs section</a>
+of [[VC-DATA-INTEGRITY]] with the following restrictions.
+          </p>
           <p>
 The `verificationMethod` property of the proof MUST be a URL.
 Dereferencing the `verificationMethod` MUST result in an object
@@ -441,15 +446,6 @@ <h3>DataIntegrityProof</h3>
 The `cryptosuite` property of the proof MUST be `bbs-2023`.
           </p>
           <p>
-The `created` property of the proof MUST be an [[XMLSCHEMA11-2]]
-formatted date string.
-          </p>
-          <p>
-The `proofPurpose` property of the proof MUST be a string, and MUST
-match the verification relationship expressed by the verification method
-`controller`.
-          </p>
-          <p>
 The value of the `proofValue` property of the proof MUST be an BBS signature or
 BBS proof produced according to [[CFRG-BBS-SIGNATURE]] then serialized and encoded
 according to procedures in section <a href="#algorithms"></a>.