diff --git a/state/state.go b/state/state.go
index 85d0f5612..5862162d1 100644
--- a/state/state.go
+++ b/state/state.go
@@ -304,24 +304,6 @@ func MedianTime(commit *types.Commit, validators *types.ValidatorSet) time.Time
 	return weightedMedian(weightedTimes, totalVotingPower)
 }
 
-// IsTimely validates that the passed in block timestamp is 'timely' according to the proposer-based timestamp algorithm.
-// To evaluate if a timestamp is timely, it is compared to the local time of the validator along with the configured
-// Precision and MsgDelay parameters.
-// Specifically, a proposed block timestamp is considered timely if it is satisfies the following inequalities:
-//
-// proposedBlockTime < validatorLocalTime + Precision + MsgDelay && proposedBlockTime > validatorLocaltime - Precision.
-//
-// For more information on the meaning of 'timely', see the proposer-based timestamp specification:
-// https://github.com/tendermint/spec/tree/master/spec/consensus/proposer-based-timestamp
-func IsTimely(bt time.Time, lt time.Time, precision time.Duration, msgDelay time.Duration) bool {
-	lhs := lt.Add(-precision).UnixMilli()
-	rhs := lt.Add(precision).Add(msgDelay).UnixMilli()
-	if lhs < bt.UnixMilli() && bt.UnixMilli() < rhs {
-		return true
-	}
-	return false
-}
-
 //------------------------------------------------------------------------
 // Genesis