Submitting namada validator set updates to Ethereum

[batconjurer]

• Namada validators should have accounts on Ethereum
• Write a VP to check validator eth keys are in storage
• Write RPC method to query validator set update proofs
• Write relayer code to submit validator set update to Eth
• In case a valset upd proof is not automatically constructed within the course of an epoch, it might be nice to build a tool to create a proof offline (low prio)

These tasks are currently not top priority, but ultimately required in the future:

• Add the submission of validator set updates to PrepareProposal for the first block proposer of a new epoch
• Events from Ethereum registering a successful validator set update should reimburse the block proposer during FinalizeBlock from the treasury

It is still to be decided how to do the following:

• retry strategies if a validator set update fails
• gas oracles for Ethereum
• the reimbursement amount and strategy

[cwgoes]

@batconjurer @james-chf what's the status of this / can we update the issue?

[batconjurer]

@sug0, can we close this?

[sug0]

guess so. the remaining requirements for validator set updates are duped in #242