Multiple Indy Ledger support and State Proof verification

[shaangill025]

• https://hackmd.io/BVye073CTiqgNEMXxDeVdQ?view
• Detailed document describing how multiple ledger support works can be found at ./Multiledger.md (this PR).

[ianco]

Hi @shaangill025 overall this looks pretty good. I haven't done a deep dive yet though.

Once thing that would be nice is a document describing how the multi-ledger support works, or how to use it, for example:

• how to I define multiple ledgers? (I know there is a hackmd but should prob be a doc in the github repo)
• what do I need to do for read vs write? (I assume the verifier has to be able to auto-select the ledger based on received proofs, but what about the issuer?)
• can you add/remove ledgers at runtime or only on startup?
• what happens if I restart an agent with a different set of ledgers than previously? (note that data in the wallet is ledger-specific, for example data associated with credential definitions)
• any impact on other functions, such as the endorser protocol (may need a different endorser for different ledgers)

See the docs for functions like multitenancy, mediation, endorser, for example.

[shaangill025]

Hi @shaangill025 overall this looks pretty good. I haven't done a deep dive yet though.

Once thing that would be nice is a document describing how the multi-ledger support works, or how to use it, for example:

• how to I define multiple ledgers? (I know there is a hackmd but should prob be a doc in the github repo)
• what do I need to do for read vs write? (I assume the verifier has to be able to auto-select the ledger based on received proofs, but what about the issuer?)
• can you add/remove ledgers at runtime or only on startup?
• what happens if I restart an agent with a different set of ledgers than previously? (note that data in the wallet is ledger-specific, for example data associated with credential definitions)
• any impact on other functions, such as the endorser protocol (may need a different endorser for different ledgers)

See the docs for functions like multitenancy, mediation, endorser, for example.

@ianco It is ready for review. I have removed the ability to update the ledger configuration or write_ledger at runtime as I observed some issues in testing (mostly around cached DID to ledger_id).

[ianco]

LGTM

[swcurran]

w00t! Awesome stuff, @shaangill025 !