After the information of a relay block is submitted, it could be challenged if someone finds the information incorrect. There is a time window for submitting challenges. The length of this time window is specified by childBlockChallengeSubmissionPeriod. There is a longer time window, of which the length is childBlockChallengePeriod, for submitting responses to the challenges. After childBlockChallengePeriod if there is no unresolved challenge, the relay block is confirmed.