DPP Evidence property - use VCDM structure or not?

Created by: onthebreeze

with reference to the discussion at Pull request #41 , this ticket is to trigger a discussion about whether / how to use the VCDM evidence property https://www.w3.org/TR/vc-data-model-2.0/#evidence or whether the evidence links should be within the DPP credential subject.

• Pro's of VCDM. It's part of the W3C VC data model recommendation.
• challenges of using VCDM. There could be dozens of evidence references, each specific to the context in which it is referenced (eg an emissions credential referenced from an emissions claim). If all evidence is grouped at the header level of a VC, then it could be trickier to figure out which evidence supports which claim.

For discussion...