Multi-sig credentials?

Hello everyone,

I thought this community might be able to provide some direction. I am
still on the learning curve, apologies if I missed some earlier work done
by yourselves.

I am currently working on a problem which I think may have already been
solved, I would appreciate it if you can kindly point me in the right
direction.

I understand and I have previously built POCs using Hyperledger Indy/Aries
that allows for verifiable credentials to be issued by a single party
(issuer). The question is, how do we issue verifiable credentials issued by
multiple-parties?

Contracts and other legal documents are sometimes signed between multiple
(more than two) parties. In a paper based approach, it is relatively
straightforward, signatures are obtained serially.  A similar approach is
adopted in electronic signing where copies of PDF are signed serially,
internally, the system generates a 'certificate of completion' which
captures metadata for legal purposes.

In the real-estate use-case I am currently working on similar 'certificate
of completion' to hold multiple cryptographic signatures of contracting
parties over an digital artifact i.e. 'smart legal contract' (for
simplicity, consider the artifact as a file containing some text and source
code before they are deployed on a DLT or VM). I was thinking the SSI + VC
model could be appropriate for this 'certificate of agreement or
completion' but I am happy to hear your thoughts and suggestions.

Many thanks in advance.

Best wishes,
Keerthi Thomas