// receive evidence from client
evidence = { result, timestamp }

// check for backdating compared to last received evidence
lastTimestamp = getLastEvidenceTimestampFromDB()
if evidence.timestamp < lastTimestamp
	evidence.timestamp = lastTimestamp

// check that timestamp is not in the future
currentTime = now()
if evidence.timestamp > currentTime
	evidence.timestamp = currentTime

setLastEvidenceTimestampInDB(evidence.timestamp)

//continue processing as usual
processEvidence(evidence)