Research IBC integration

[prestwich]

What do we need to do here?

Some areas with questions/design considerations:

1. how do we add an IBC module keeper reference on relay keeper
   1. (see setup on the gaia chain for examples of keepers referencing keepers)
2. What is the IBC module interface like? Find a link and drop it here
3. Should we dispatch an IBC message when a SubmitProof message is validated, or at the end of the block?
4. How are IBC messages intended to be formatted
5. What processes the message
   1. should we design a small Proof receiver module inteface (so that others can implement the receiver)

[prestwich]

current work on IBC is here:
cosmos/cosmos-sdk#5277

[fedekunze]

This might help: https://github.com/cosmos/cosmos-sdk/tree/ibc-alpha/x/ibc/spec

[prestwich]

Appreciate it 👐

[prestwich]

Status update:

We may want to wait on this until IBC is specced and ready for arbitrary messages instead of asset passing. In the meantime, I think a simple interface for a ProofHandler module should be sufficient.