diff --git a/CHANGES.md b/CHANGES.md
index d8ccc8e00c6..3f0e1b4b0a4 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -42,10 +42,17 @@ To be released.
  -  Added `IAccountStateDeltaView.GetValidatorSet()` interface method.
     [[#3247]]
  -  Added `IAccountStateDelta.SetValidator()` interface method.  [[#3247]]
+ -  `Vote.BlockHash` property became `BlockHash` type. (was `BlockHash?`)
+    [[#3249]]
+ -  `VoteMetadata(long, int, BlockHash?, DateTimeOffset, PublicKey, VoteFlag)`
+    constructor became
+    `VoteMetadata(long, int, BlockHash, DateTimeOffset, PublicKey, VoteFlag)`
+    [[#3249]]
  -  (Libplanet.Net) Renamed `Step` enum to `ConsensusStep`
     to remove ambiguity.  [[#3249]]
  -  (Libplanet.Net) `ConsensusProposalMsg`, `ConsensusPreVoteMsg` and
     `ConsensusPreCommitMsg` became to inherit `ConsensusVoteMsg`.  [[#3249]]
+ -  (Libplanet.Net) Removed `ConsensusMsg.BlockHash` property.  [[#3249]]
 
 ### Backward-incompatible network protocol changes
 
diff --git a/Libplanet.Net/Consensus/Context.Mutate.cs b/Libplanet.Net/Consensus/Context.Mutate.cs
index 99b213ac338..f81ea437723 100644
--- a/Libplanet.Net/Consensus/Context.Mutate.cs
+++ b/Libplanet.Net/Consensus/Context.Mutate.cs
@@ -301,7 +301,7 @@ private void ProcessGenericUponRules()
                     BroadcastMessage(
                         new ConsensusPreCommitMsg(MakeVote(Round, default, VoteFlag.PreCommit)));
                 }
-                else if (!(Proposal is null) && !hash3.Equals(Proposal.BlockHash))
+                else if (Proposal is { } proposal && !proposal.BlockHash.Equals(hash3))
                 {
                     // +2/3 votes were collected and is not equal to proposal's,
                     // remove invalid proposal.
diff --git a/Libplanet.Net/Consensus/HeightVoteSet.cs b/Libplanet.Net/Consensus/HeightVoteSet.cs
index 1ba4b16dc64..8a2ab23ca6e 100644
--- a/Libplanet.Net/Consensus/HeightVoteSet.cs
+++ b/Libplanet.Net/Consensus/HeightVoteSet.cs
@@ -178,7 +178,7 @@ public void AddVote(Vote vote)
                     }
                 }
 
-                voteSet.AddVerifiedVote(vote);
+                voteSet.AddVote(vote);
             }
         }
 
@@ -230,12 +230,12 @@ public VoteSet PreCommits(int round)
         /// <exception cref="ArgumentException">Thrown when given <paramref name="voteFlag"/>
         /// is not either <see cref="VoteFlag.PreVote"/> or <see cref="VoteFlag.PreCommit"/>.
         /// </exception>
+        /// <exception cref="KeyNotFoundException">Thrown when there's no <see cref="RoundVoteSet"/>
+        /// exists for given <paramref name="round"/>.
+        /// </exception>
         public VoteSet GetVoteSet(int round, VoteFlag voteFlag)
         {
-            RoundVoteSet roundVoteSet;
-
-            // TODO: Check if try-catch is needed for KeyNotFoundException.
-            roundVoteSet = _roundVoteSets[round];
+            RoundVoteSet roundVoteSet = _roundVoteSets[round];
             return voteFlag switch
             {
                 VoteFlag.PreVote => roundVoteSet.PreVotes,
diff --git a/Libplanet.Net/Consensus/VoteSet.cs b/Libplanet.Net/Consensus/VoteSet.cs
index 4439c0782e7..9bf9a503faf 100644
--- a/Libplanet.Net/Consensus/VoteSet.cs
+++ b/Libplanet.Net/Consensus/VoteSet.cs
@@ -260,7 +260,7 @@ public bool TwoThirdsMajority(out BlockHash blockHash)
                 _height, _round, _maj23!.Value, MappedList().ToImmutableArray());
         }
 
-        internal void AddVerifiedVote(Vote vote)
+        internal void AddVote(Vote vote)
         {
             if (vote.Round != _round ||
                 vote.Flag != _voteType)
@@ -283,7 +283,7 @@ internal void AddVerifiedVote(Vote vote)
                 if (existing.BlockHash.Equals(vote.BlockHash))
                 {
                     throw new InvalidVoteException(
-                        $"{nameof(AddVerifiedVote)}() does not expect duplicate votes",
+                        $"{nameof(AddVote)}() does not expect duplicate votes",
                         vote);
                 }
                 else