diff --git a/vms/platformvm/block/executor/verifier.go b/vms/platformvm/block/executor/verifier.go
index 7d13bb038f1..6616fd58bad 100644
--- a/vms/platformvm/block/executor/verifier.go
+++ b/vms/platformvm/block/executor/verifier.go
@@ -93,7 +93,8 @@ func (v *verifier) BanffProposalBlock(b *block.BanffProposalBlock) error {
 	}
 
 	return v.proposalBlock(
-		&b.ApricotProposalBlock,
+		b,
+		b.Tx,
 		onDecisionState,
 		onCommitState,
 		onAbortState,
@@ -132,7 +133,12 @@ func (v *verifier) BanffStandardBlock(b *block.BanffStandardBlock) error {
 	}
 
 	feeCalculator := state.PickFeeCalculator(v.txExecutorBackend.Config, onAcceptState)
-	return v.standardBlock(&b.ApricotStandardBlock, feeCalculator, onAcceptState)
+	return v.standardBlock(
+		b,
+		b.Transactions,
+		feeCalculator,
+		onAcceptState,
+	)
 }
 
 func (v *verifier) ApricotAbortBlock(b *block.ApricotAbortBlock) error {
@@ -168,7 +174,17 @@ func (v *verifier) ApricotProposalBlock(b *block.ApricotProposalBlock) error {
 		timestamp     = onCommitState.GetTimestamp() // Equal to parent timestamp
 		feeCalculator = state.NewStaticFeeCalculator(v.txExecutorBackend.Config, timestamp)
 	)
-	return v.proposalBlock(b, nil, onCommitState, onAbortState, feeCalculator, nil, nil, nil)
+	return v.proposalBlock(
+		b,
+		b.Tx,
+		nil,
+		onCommitState,
+		onAbortState,
+		feeCalculator,
+		nil,
+		nil,
+		nil,
+	)
 }
 
 func (v *verifier) ApricotStandardBlock(b *block.ApricotStandardBlock) error {
@@ -186,7 +202,12 @@ func (v *verifier) ApricotStandardBlock(b *block.ApricotStandardBlock) error {
 		timestamp     = onAcceptState.GetTimestamp() // Equal to parent timestamp
 		feeCalculator = state.NewStaticFeeCalculator(v.txExecutorBackend.Config, timestamp)
 	)
-	return v.standardBlock(b, feeCalculator, onAcceptState)
+	return v.standardBlock(
+		b,
+		b.Transactions,
+		feeCalculator,
+		onAcceptState,
+	)
 }
 
 func (v *verifier) ApricotAtomicBlock(b *block.ApricotAtomicBlock) error {
@@ -364,7 +385,8 @@ func (v *verifier) commitBlock(b block.Block) error {
 
 // proposalBlock populates the state of this block if [nil] is returned
 func (v *verifier) proposalBlock(
-	b *block.ApricotProposalBlock,
+	b block.Block,
+	tx *txs.Tx,
 	onDecisionState state.Diff,
 	onCommitState state.Diff,
 	onAbortState state.Diff,
@@ -378,19 +400,19 @@ func (v *verifier) proposalBlock(
 		OnAbortState:  onAbortState,
 		Backend:       v.txExecutorBackend,
 		FeeCalculator: feeCalculator,
-		Tx:            b.Tx,
+		Tx:            tx,
 	}
 
-	if err := b.Tx.Unsigned.Visit(&txExecutor); err != nil {
-		txID := b.Tx.ID()
+	if err := tx.Unsigned.Visit(&txExecutor); err != nil {
+		txID := tx.ID()
 		v.MarkDropped(txID, err) // cache tx as dropped
 		return err
 	}
 
-	onCommitState.AddTx(b.Tx, status.Committed)
-	onAbortState.AddTx(b.Tx, status.Aborted)
+	onCommitState.AddTx(tx, status.Committed)
+	onAbortState.AddTx(tx, status.Aborted)
 
-	v.Mempool.Remove(b.Tx)
+	v.Mempool.Remove(tx)
 
 	blkID := b.ID()
 	v.blkIDToState[blkID] = &blockState{
@@ -417,16 +439,22 @@ func (v *verifier) proposalBlock(
 
 // standardBlock populates the state of this block if [nil] is returned
 func (v *verifier) standardBlock(
-	b *block.ApricotStandardBlock,
+	b block.Block,
+	txs []*txs.Tx,
 	feeCalculator fee.Calculator,
 	onAcceptState state.Diff,
 ) error {
-	inputs, atomicRequests, onAcceptFunc, err := v.processStandardTxs(b.Transactions, feeCalculator, onAcceptState, b.Parent())
+	inputs, atomicRequests, onAcceptFunc, err := v.processStandardTxs(
+		txs,
+		feeCalculator,
+		onAcceptState,
+		b.Parent(),
+	)
 	if err != nil {
 		return err
 	}
 
-	v.Mempool.Remove(b.Transactions...)
+	v.Mempool.Remove(txs...)
 
 	blkID := b.ID()
 	v.blkIDToState[blkID] = &blockState{
diff --git a/vms/platformvm/block/executor/verifier_test.go b/vms/platformvm/block/executor/verifier_test.go
index da3ef3e330f..8606f42127c 100644
--- a/vms/platformvm/block/executor/verifier_test.go
+++ b/vms/platformvm/block/executor/verifier_test.go
@@ -1208,8 +1208,9 @@ func TestBlockExecutionWithComplexity(t *testing.T) {
 			}
 
 			require.Contains(verifier.blkIDToState, blkID)
-			onAcceptState := verifier.blkIDToState[blkID].onAcceptState
-			require.Equal(test.expectedFeeState, onAcceptState.GetFeeState())
+			blockState := verifier.blkIDToState[blkID]
+			require.Equal(blk, blockState.statelessBlock)
+			require.Equal(test.expectedFeeState, blockState.onAcceptState.GetFeeState())
 		})
 	}
 }
diff --git a/vms/platformvm/state/state.go b/vms/platformvm/state/state.go
index 129d210b120..bede6daaea8 100644
--- a/vms/platformvm/state/state.go
+++ b/vms/platformvm/state/state.go
@@ -2261,9 +2261,11 @@ func (s *state) writeSubnetOnlyValidators(updateValidators bool, height uint64)
 			return err
 		}
 
-		subnetIDNodeIDKey := make([]byte, len(sov.SubnetID)+len(sov.NodeID))
-		copy(subnetIDNodeIDKey, sov.SubnetID[:])
-		copy(subnetIDNodeIDKey[len(sov.SubnetID):], sov.NodeID[:])
+		subnetIDNodeID := subnetIDNodeID{
+			subnetID: sov.SubnetID,
+			nodeID:   sov.NodeID,
+		}
+		subnetIDNodeIDKey := subnetIDNodeID.Marshal()
 		if err := s.subnetIDNodeIDDB.Delete(subnetIDNodeIDKey); err != nil {
 			return err
 		}
@@ -2375,9 +2377,11 @@ func (s *state) writeSubnetOnlyValidators(updateValidators bool, height uint64)
 	for validationID, sov := range sovChanges {
 		validationID := validationID
 
-		subnetIDNodeIDKey := make([]byte, len(sov.SubnetID)+len(sov.NodeID))
-		copy(subnetIDNodeIDKey, sov.SubnetID[:])
-		copy(subnetIDNodeIDKey[len(sov.SubnetID):], sov.NodeID[:])
+		subnetIDNodeID := subnetIDNodeID{
+			subnetID: sov.SubnetID,
+			nodeID:   sov.NodeID,
+		}
+		subnetIDNodeIDKey := subnetIDNodeID.Marshal()
 		if err := s.subnetIDNodeIDDB.Put(subnetIDNodeIDKey, validationID[:]); err != nil {
 			return err
 		}
diff --git a/vms/platformvm/state/subnet_only_validator.go b/vms/platformvm/state/subnet_only_validator.go
index 487471a5f2b..180528bbb9e 100644
--- a/vms/platformvm/state/subnet_only_validator.go
+++ b/vms/platformvm/state/subnet_only_validator.go
@@ -18,11 +18,16 @@ import (
 	safemath "github.com/ava-labs/avalanchego/utils/math"
 )
 
+// subnetIDNodeID = [subnetID] + [nodeID]
+const subnetIDNodeIDEntryLength = ids.IDLen + ids.NodeIDLen
+
 var (
 	_ btree.LessFunc[SubnetOnlyValidator] = SubnetOnlyValidator.Less
 
 	ErrMutatedSubnetOnlyValidator   = errors.New("subnet only validator contains mutated constant fields")
 	ErrDuplicateSubnetOnlyValidator = errors.New("subnet only validator contains conflicting subnetID + nodeID pair")
+
+	errUnexpectedSubnetIDNodeIDLength = fmt.Errorf("expected subnetID+nodeID entry length %d", subnetIDNodeIDEntryLength)
 )
 
 type SubnetOnlyValidators interface {
@@ -172,6 +177,23 @@ type subnetIDNodeID struct {
 	nodeID   ids.NodeID
 }
 
+func (s *subnetIDNodeID) Marshal() []byte {
+	data := make([]byte, subnetIDNodeIDEntryLength)
+	copy(data, s.subnetID[:])
+	copy(data[ids.IDLen:], s.nodeID[:])
+	return data
+}
+
+func (s *subnetIDNodeID) Unmarshal(data []byte) error {
+	if len(data) != subnetIDNodeIDEntryLength {
+		return errUnexpectedSubnetIDNodeIDLength
+	}
+
+	copy(s.subnetID[:], data)
+	copy(s.nodeID[:], data[ids.IDLen:])
+	return nil
+}
+
 type subnetOnlyValidatorsDiff struct {
 	numAddedActive      int               // May be negative
 	modifiedTotalWeight map[ids.ID]uint64 // subnetID -> totalWeight