Docs // developers // modules // oracle // 03_end_block

End Block

Tally Exchange Rate Votes

At the end of every block, the Oracle module checks whether it's the last block of the VotePeriod. If it is, it runs the Voting Procedure:

1. All current active exchange rates are purged from the store

2. Received votes are organized into ballots by denomination. Votes by inactive or jailed validators are ignored.

3. Exchange rates not meeting the following requirements will be dropped:

   • Must appear in the permitted denominations in AcceptList
   • Ballot for rate must have at least VoteThreshold total vote power

4. For each remaining denom with a passing ballot:

   • Tally up votes and find the weighted median exchange rate and winners with tally()
   • Iterate through winners of the ballot and add their weight to their running total
   • Set the exchange rate on the blockchain for that denom with k.SetExchangeRate()
   • Emit an exchange_rate_update event

5. Count up the validators who missed the Oracle vote and increase the appropriate miss counters

6. If at the end of a SlashWindow, penalize validators who have missed more than the penalty threshold (submitted fewer valid votes than MinValidPerWindow)

7. Distribute rewards to ballot winners with k.RewardBallotWinners()

8. Clear all prevotes (except ones for the next VotePeriod) and votes from the store