[RPC] Add Rewards Endpoint

[jessicadaugherty]

Please explain the goal of the RFP.

Currently there are no 100% accurate sources of reward information for the Pocket protocol. We have been trying to build get our internal indexer to be 100% accurate for months, to no avail. Its also difficult because of the lack of documentation and dev support from protocol.

Pocket validators already do the exact calculation to keep track of the state. It does not make sense to replicate this complicated calculation externally when we can let the PCC do it, for it is the source of truth.

This would be something tremendously beneficial for the entire ecosystem, unfortunately we don’t have the bandwidth right now to do it. I think everyone has recreated their own indexer in some way, which is not an efficient use of resources as it can be included directly into the client. Its even more complicated when there are bugs like after the noncustodial upgrade where nodes didn’t earn rewards, it takes a lot of time to update an indexer accordingly.

Please provide a justification for your RFP.

Not having accuracy is problematic for many reasons:

• Unable to discern with confidence how your infrastructure compares to other providers and setups
• Unable to give clients reports based on rewards and instead having to rely on the actual balance of the nodes
• Unnecessary time spent looking for sources of discrepancy

Please provide a success criteria for proposals responding to this RFP.

• Pass in txhash of a proof and return # of relays and reward earned
• Pass in a block number and return a list of all the proofs with # of relays and rewards earned

Add aditional context regarding this RFP.

This function handles all the proof logic. Takes a proof obj as input, grabs its relevant claim, and calculates the token reward. I'm not sure from what context this is typically called, (I would imagine this runs only as the node is syncing and building the state), so might have to make an additional function thats read-only, or modify this function to be queryable without modifying state and return the other values needed (relays,chain)

pocket-core/x/pocketcore/handler.go

Line 60 in 3f833bd

func handleProofMsg(ctx sdk.Ctx, k keeper.Keeper, proof types.MsgProof) sdk.Result {