Implement manifest MVP

[a-stacey]

Up until now we have had 3 major practicality issues:

• Walking the supply chain.
• Authorization Model
• Data sharing

Manifests are one solution to walking the supply chain.

We propose that the manifests structure looks like:
[ParentSignature] -> [] = new manifest / first entry in a manifest, [a] = normal transaction, [a, ...] = aggregation event.
EventID
Timestamp
GLN
EventHash (Possibly)
Signature -> (Composite of all the other fields in the event structure signed with the organisations public key)

We intend to provide an MVP solution of/for Manifests as an enabler of discovering solutions for the other problems and to see if this solution works in practice and so that we can demonstrate our proposed architecture.