feat: Pin and Link Proof of Portfolio during Epoch Close

[mustermeiszer]

Needed for future oracle integrations. These integrations will query the proof of portfolio and verify it.

Process

1. Updating NAV through the UI

   • Sign attestation with private key from the connected key-pair offchain
     ONLY sign the portfolio section!
   • Pin attestation on ipfs
   • Update portfolio onchain

     remark.Remark(IPFS_HASH, utility.batchAll(UPDATE_PRICES, UPDATE_NAV, ...))
     

   • IF WANTED: Close and execute epoch

2. Subquery indexes latest portfolio attestation by filtering for Remark::IPFS-event the and extracting the info from the JSON

3. Chronicle retrieves latest portfolio attestation from subquery

   • Verifies signature is from known public key of fund admin
   • Post check of verification on EVM chains

Full Spec

[mustermeiszer]

TBD: Indexing logic and work