Certificate Store

Goal: Store and disseminate information about finality certs within the node

chainstore but for certificates, new certs pass through it, maintains a persistent state of last verified state

Reqs:

• Store finality certificates
• Create a common point where knowledge of new certificates is disseminated
• If the certificate cannot be directly verified due to a lack of prerequisite certificates, a cert sync should trigger in Finality Certificate Exchange.

Open questions:

• Do we assume everyone keeps all finality certs?

Interfaces with:

• Sync and checkpoint API
• Finality Certificate Exchange Protocol
• Granite outputs a signal when new finalization happens (integrate granite loop with F3 module)