diff --git a/pkg/core/blockchain.go b/pkg/core/blockchain.go
index d3c9fc710..01243fa1b 100644
--- a/pkg/core/blockchain.go
+++ b/pkg/core/blockchain.go
@@ -29,7 +29,7 @@ import (
 // Tuning parameters.
 const (
 	headerBatchCount = 2000
-	version          = "0.0.6"
+	version          = "0.0.7"
 
 	// This one comes from C# code and it's different from the constant used
 	// when creating an asset with Neo.Asset.Create interop call. It looks
@@ -475,7 +475,7 @@ func (bc *Blockchain) storeBlock(block *block.Block) error {
 			return err
 		}
 
-		if err := cache.PutUnspentCoinState(tx.Hash(), NewUnspentCoinState(len(tx.Outputs))); err != nil {
+		if err := cache.PutUnspentCoinState(tx.Hash(), state.NewUnspentCoin(block.Index, tx)); err != nil {
 			return err
 		}
 
@@ -487,22 +487,20 @@ func (bc *Blockchain) storeBlock(block *block.Block) error {
 		// Process TX inputs that are grouped by previous hash.
 		for _, inputs := range transaction.GroupInputsByPrevHash(tx.Inputs) {
 			prevHash := inputs[0].PrevHash
-			prevTX, prevTXHeight, err := bc.dao.GetTransaction(prevHash)
-			if err != nil {
-				return fmt.Errorf("could not find previous TX: %s", prevHash)
-			}
-			unspent, err := cache.GetUnspentCoinStateOrNew(prevHash)
+			unspent, err := cache.GetUnspentCoinState(prevHash)
 			if err != nil {
 				return err
 			}
-			spentCoin, err := cache.GetSpentCoinsOrNew(prevHash, prevTXHeight)
-			if err != nil {
-				return err
-			}
-			oldSpentCoinLen := len(spentCoin.items)
 			for _, input := range inputs {
-				unspent.states[input.PrevIndex] = state.CoinSpent
-				prevTXOutput := prevTX.Outputs[input.PrevIndex]
+				if len(unspent.States) <= int(input.PrevIndex) {
+					return fmt.Errorf("bad input: %s/%d", input.PrevHash.StringLE(), input.PrevIndex)
+				}
+				if unspent.States[input.PrevIndex].State&state.CoinSpent != 0 {
+					return fmt.Errorf("double spend: %s/%d", input.PrevHash.StringLE(), input.PrevIndex)
+				}
+				unspent.States[input.PrevIndex].State |= state.CoinSpent
+				unspent.States[input.PrevIndex].SpendHeight = block.Index
+				prevTXOutput := &unspent.States[input.PrevIndex].Output
 				account, err := cache.GetAccountStateOrNew(prevTXOutput.ScriptHash)
 				if err != nil {
 					return err
@@ -510,14 +508,13 @@ func (bc *Blockchain) storeBlock(block *block.Block) error {
 
 				if prevTXOutput.AssetID.Equals(GoverningTokenID()) {
 					account.Unclaimed = append(account.Unclaimed, state.UnclaimedBalance{
-						Tx:    prevTX.Hash(),
+						Tx:    input.PrevHash,
 						Index: input.PrevIndex,
-						Start: prevTXHeight,
+						Start: unspent.Height,
 						End:   block.Index,
 						Value: prevTXOutput.Amount,
 					})
-					spentCoin.items[input.PrevIndex] = block.Index
-					if err = processTXWithValidatorsSubtract(&prevTXOutput, account, cache); err != nil {
+					if err = processTXWithValidatorsSubtract(prevTXOutput, account, cache); err != nil {
 						return err
 					}
 				}
@@ -548,11 +545,6 @@ func (bc *Blockchain) storeBlock(block *block.Block) error {
 			if err = cache.PutUnspentCoinState(prevHash, unspent); err != nil {
 				return err
 			}
-			if oldSpentCoinLen != len(spentCoin.items) {
-				if err = cache.PutSpentCoinState(prevHash, spentCoin); err != nil {
-					return err
-				}
-			}
 		}
 
 		// Process the underlying type of the TX.
@@ -588,17 +580,18 @@ func (bc *Blockchain) storeBlock(block *block.Block) error {
 			// Remove claimed NEO from spent coins making it unavalaible for
 			// additional claims.
 			for _, input := range t.Claims {
-				scs, err := cache.GetSpentCoinState(input.PrevHash)
+				scs, err := cache.GetUnspentCoinState(input.PrevHash)
 				if err == nil {
-					_, ok := scs.items[input.PrevIndex]
-					if !ok {
-						err = errors.New("no spent coin state")
+					if len(scs.States) <= int(input.PrevIndex) {
+						err = errors.New("invalid claim index")
+					} else if scs.States[input.PrevIndex].State&state.CoinClaimed != 0 {
+						err = errors.New("double claim")
 					}
 				}
 				if err != nil {
 					// We can't really do anything about it
 					// as it's a transaction in a signed block.
-					bc.log.Warn("DOUBLE CLAIM",
+					bc.log.Warn("FALSE OR DOUBLE CLAIM",
 						zap.String("PrevHash", input.PrevHash.StringLE()),
 						zap.Uint16("PrevIndex", input.PrevIndex),
 						zap.String("tx", tx.Hash().StringLE()),
@@ -611,14 +604,13 @@ func (bc *Blockchain) storeBlock(block *block.Block) error {
 					break
 				}
 
-				prevTx, _, err := cache.GetTransaction(input.PrevHash)
+				acc, err := cache.GetAccountState(scs.States[input.PrevIndex].ScriptHash)
 				if err != nil {
 					return err
-				} else if int(input.PrevIndex) > len(prevTx.Outputs) {
-					return errors.New("invalid input in claim")
 				}
-				acc, err := cache.GetAccountState(prevTx.Outputs[input.PrevIndex].ScriptHash)
-				if err != nil {
+
+				scs.States[input.PrevIndex].State |= state.CoinClaimed
+				if err = cache.PutUnspentCoinState(input.PrevHash, scs); err != nil {
 					return err
 				}
 
@@ -643,17 +635,6 @@ func (bc *Blockchain) storeBlock(block *block.Block) error {
 				} else if err := cache.PutAccountState(acc); err != nil {
 					return err
 				}
-
-				delete(scs.items, input.PrevIndex)
-				if len(scs.items) > 0 {
-					if err = cache.PutSpentCoinState(input.PrevHash, scs); err != nil {
-						return err
-					}
-				} else {
-					if err = cache.DeleteSpentCoinState(input.PrevHash); err != nil {
-						return err
-					}
-				}
 			}
 		case *transaction.EnrollmentTX:
 			if err := processEnrollmentTX(cache, t); err != nil {
@@ -1174,7 +1155,7 @@ func (bc *Blockchain) GetAccountState(scriptHash util.Uint160) *state.Account {
 }
 
 // GetUnspentCoinState returns unspent coin state for given tx hash.
-func (bc *Blockchain) GetUnspentCoinState(hash util.Uint256) *UnspentCoinState {
+func (bc *Blockchain) GetUnspentCoinState(hash util.Uint256) *state.UnspentCoin {
 	ucs, err := bc.dao.GetUnspentCoinState(hash)
 	if ucs == nil && err != storage.ErrKeyNotFound {
 		bc.log.Warn("failed to get unspent coin state", zap.Error(err))
@@ -1245,15 +1226,15 @@ func (bc *Blockchain) references(ins []transaction.Input) ([]transaction.InOut,
 
 	for _, inputs := range transaction.GroupInputsByPrevHash(ins) {
 		prevHash := inputs[0].PrevHash
-		tx, _, err := bc.dao.GetTransaction(prevHash)
+		unspent, err := bc.dao.GetUnspentCoinState(prevHash)
 		if err != nil {
 			return nil, errors.New("bad input reference")
 		}
 		for _, in := range inputs {
-			if int(in.PrevIndex) > len(tx.Outputs)-1 {
+			if int(in.PrevIndex) > len(unspent.States)-1 {
 				return nil, errors.New("bad input reference")
 			}
-			references = append(references, transaction.InOut{In: *in, Out: tx.Outputs[in.PrevIndex]})
+			references = append(references, transaction.InOut{In: *in, Out: unspent.States[in.PrevIndex].Output})
 		}
 	}
 	return references, nil
@@ -1364,7 +1345,12 @@ func (bc *Blockchain) verifyTx(t *transaction.Transaction, block *block.Block) e
 	if err := bc.verifyOutputs(t); err != nil {
 		return errors.Wrap(err, "wrong outputs")
 	}
-	if err := bc.verifyResults(t); err != nil {
+	refs, err := bc.References(t)
+	if err != nil {
+		return err
+	}
+	results := refsAndOutsToResults(refs, t.Outputs)
+	if err := bc.verifyResults(t, results); err != nil {
 		return err
 	}
 
@@ -1383,7 +1369,7 @@ func (bc *Blockchain) verifyTx(t *transaction.Transaction, block *block.Block) e
 		if bc.dao.IsDoubleClaim(claim) {
 			return errors.New("double claim")
 		}
-		if err := bc.verifyClaims(t); err != nil {
+		if err := bc.verifyClaims(t, results); err != nil {
 			return err
 		}
 	case transaction.InvocationType:
@@ -1396,10 +1382,9 @@ func (bc *Blockchain) verifyTx(t *transaction.Transaction, block *block.Block) e
 	return bc.verifyTxWitnesses(t, block)
 }
 
-func (bc *Blockchain) verifyClaims(tx *transaction.Transaction) (err error) {
+func (bc *Blockchain) verifyClaims(tx *transaction.Transaction, results []*transaction.Result) (err error) {
 	t := tx.Data.(*transaction.ClaimTX)
 	var result *transaction.Result
-	results := bc.GetTransactionResults(tx)
 	for i := range results {
 		if results[i].AssetID == UtilityTokenID() {
 			result = results[i]
@@ -1426,17 +1411,26 @@ func (bc *Blockchain) calculateBonus(claims []transaction.Input) (util.Fixed8, e
 
 	for _, group := range inputs {
 		h := group[0].PrevHash
-		claimable, err := bc.getUnclaimed(h)
-		if err != nil || len(claimable) == 0 {
-			return 0, errors.New("no unclaimed inputs")
+		unspent, err := bc.dao.GetUnspentCoinState(h)
+		if err != nil {
+			return 0, err
 		}
 
 		for _, c := range group {
-			s, ok := claimable[c.PrevIndex]
-			if !ok {
+			if len(unspent.States) <= int(c.PrevIndex) {
 				return 0, fmt.Errorf("can't find spent coins for %s (%d)", c.PrevHash.StringLE(), c.PrevIndex)
 			}
-			unclaimed = append(unclaimed, s)
+			if unspent.States[c.PrevIndex].State&state.CoinSpent == 0 {
+				return 0, fmt.Errorf("not spent yet: %s/%d", c.PrevHash.StringLE(), c.PrevIndex)
+			}
+			if unspent.States[c.PrevIndex].State&state.CoinClaimed != 0 {
+				return 0, fmt.Errorf("already claimed: %s/%d", c.PrevHash.StringLE(), c.PrevIndex)
+			}
+			unclaimed = append(unclaimed, &spentCoin{
+				Output:      &unspent.States[c.PrevIndex].Output,
+				StartHeight: unspent.Height,
+				EndHeight:   unspent.States[c.PrevIndex].SpendHeight,
+			})
 		}
 	}
 
@@ -1456,29 +1450,6 @@ func (bc *Blockchain) calculateBonusInternal(scs []*spentCoin) (util.Fixed8, err
 	return claimed, nil
 }
 
-func (bc *Blockchain) getUnclaimed(h util.Uint256) (map[uint16]*spentCoin, error) {
-	tx, txHeight, err := bc.GetTransaction(h)
-	if err != nil {
-		return nil, err
-	}
-
-	scs, err := bc.dao.GetSpentCoinState(h)
-	if err != nil {
-		return nil, err
-	}
-
-	result := make(map[uint16]*spentCoin)
-	for i, height := range scs.items {
-		result[i] = &spentCoin{
-			Output:      &tx.Outputs[i],
-			StartHeight: txHeight,
-			EndHeight:   height,
-		}
-	}
-
-	return result, nil
-}
-
 // isTxStillRelevant is a callback for mempool transaction filtering after the
 // new block addition. It returns false for transactions already present in the
 // chain (added by the new block), transactions using some inputs that are
@@ -1581,11 +1552,7 @@ func (bc *Blockchain) verifyOutputs(t *transaction.Transaction) error {
 	return nil
 }
 
-func (bc *Blockchain) verifyResults(t *transaction.Transaction) error {
-	results := bc.GetTransactionResults(t)
-	if results == nil {
-		return errors.New("tx has no results")
-	}
+func (bc *Blockchain) verifyResults(t *transaction.Transaction, results []*transaction.Result) error {
 	var resultsDestroy []*transaction.Result
 	var resultsIssue []*transaction.Result
 	for _, re := range results {
@@ -1641,36 +1608,30 @@ func (bc *Blockchain) verifyResults(t *transaction.Transaction) error {
 // GetTransactionResults returns the transaction results aggregate by assetID.
 // Golang of GetTransationResults method in C# (https://github.com/neo-project/neo/blob/master/neo/Network/P2P/Payloads/Transaction.cs#L207)
 func (bc *Blockchain) GetTransactionResults(t *transaction.Transaction) []*transaction.Result {
-	var tempResults []*transaction.Result
-	var results []*transaction.Result
-	tempGroupResult := make(map[util.Uint256]util.Fixed8)
-
 	references, err := bc.References(t)
 	if err != nil {
 		return nil
 	}
+	return refsAndOutsToResults(references, t.Outputs)
+}
+
+// mapReferencesToResults returns cumulative results of transaction based in its
+// references and outputs.
+func refsAndOutsToResults(references []transaction.InOut, outputs []transaction.Output) []*transaction.Result {
+	var results []*transaction.Result
+	tempResult := make(map[util.Uint256]util.Fixed8)
+
 	for _, inout := range references {
-		tempResults = append(tempResults, &transaction.Result{
-			AssetID: inout.Out.AssetID,
-			Amount:  inout.Out.Amount,
-		})
+		c := tempResult[inout.Out.AssetID]
+		tempResult[inout.Out.AssetID] = c.Add(inout.Out.Amount)
 	}
-	for _, output := range t.Outputs {
-		tempResults = append(tempResults, &transaction.Result{
-			AssetID: output.AssetID,
-			Amount:  -output.Amount,
-		})
-	}
-	for _, r := range tempResults {
-		if amount, ok := tempGroupResult[r.AssetID]; ok {
-			tempGroupResult[r.AssetID] = amount.Add(r.Amount)
-		} else {
-			tempGroupResult[r.AssetID] = r.Amount
-		}
+	for _, output := range outputs {
+		c := tempResult[output.AssetID]
+		tempResult[output.AssetID] = c.Sub(output.Amount)
 	}
 
 	results = []*transaction.Result{} // this assignment is necessary. (Most of the time amount == 0 and results is the empty slice.)
-	for assetID, amount := range tempGroupResult {
+	for assetID, amount := range tempResult {
 		if amount != util.Fixed8(0) {
 			results = append(results, &transaction.Result{
 				AssetID: assetID,
@@ -1720,20 +1681,20 @@ func (bc *Blockchain) GetValidators(txes ...*transaction.Transaction) ([]*keys.P
 			}
 
 			for hash, inputs := range group {
-				prevTx, _, err := cache.GetTransaction(hash)
+				unspent, err := cache.GetUnspentCoinState(hash)
 				if err != nil {
 					return nil, err
 				}
 				// process inputs
 				for _, input := range inputs {
-					prevOutput := prevTx.Outputs[input.PrevIndex]
+					prevOutput := &unspent.States[input.PrevIndex].Output
 					accountState, err := cache.GetAccountStateOrNew(prevOutput.ScriptHash)
 					if err != nil {
 						return nil, err
 					}
 
 					// process account state votes: if there are any -> validators will be updated.
-					if err = processTXWithValidatorsSubtract(&prevOutput, accountState, cache); err != nil {
+					if err = processTXWithValidatorsSubtract(prevOutput, accountState, cache); err != nil {
 						return nil, err
 					}
 					delete(accountState.Balances, prevOutput.AssetID)
diff --git a/pkg/core/blockchainer.go b/pkg/core/blockchainer.go
index b38089076..38de63b4e 100644
--- a/pkg/core/blockchainer.go
+++ b/pkg/core/blockchainer.go
@@ -42,7 +42,7 @@ type Blockchainer interface {
 	GetStorageItems(hash util.Uint160) (map[string]*state.StorageItem, error)
 	GetTestVM() (*vm.VM, storage.Store)
 	GetTransaction(util.Uint256) (*transaction.Transaction, uint32, error)
-	GetUnspentCoinState(util.Uint256) *UnspentCoinState
+	GetUnspentCoinState(util.Uint256) *state.UnspentCoin
 	References(t *transaction.Transaction) ([]transaction.InOut, error)
 	mempool.Feer // fee interface
 	PoolTx(*transaction.Transaction) error
diff --git a/pkg/core/cacheddao.go b/pkg/core/cacheddao.go
index 65e61c362..8e8d03e7d 100644
--- a/pkg/core/cacheddao.go
+++ b/pkg/core/cacheddao.go
@@ -13,13 +13,15 @@ type cachedDao struct {
 	dao
 	accounts  map[util.Uint160]*state.Account
 	contracts map[util.Uint160]*state.Contract
+	unspents  map[util.Uint256]*state.UnspentCoin
 }
 
 // newCachedDao returns new cachedDao wrapping around given backing store.
 func newCachedDao(backend storage.Store) *cachedDao {
 	accs := make(map[util.Uint160]*state.Account)
 	ctrs := make(map[util.Uint160]*state.Contract)
-	return &cachedDao{*newDao(backend), accs, ctrs}
+	unspents := make(map[util.Uint256]*state.UnspentCoin)
+	return &cachedDao{*newDao(backend), accs, ctrs, unspents}
 }
 
 // GetAccountStateOrNew retrieves Account from cache or underlying Store
@@ -69,6 +71,20 @@ func (cd *cachedDao) DeleteContractState(hash util.Uint160) error {
 	return cd.dao.DeleteContractState(hash)
 }
 
+// GetUnspentCoinState retrieves UnspentCoin from cache or underlying Store.
+func (cd *cachedDao) GetUnspentCoinState(hash util.Uint256) (*state.UnspentCoin, error) {
+	if cd.unspents[hash] != nil {
+		return cd.unspents[hash], nil
+	}
+	return cd.dao.GetUnspentCoinState(hash)
+}
+
+// PutUnspentCoinState saves given UnspentCoin in the cache.
+func (cd *cachedDao) PutUnspentCoinState(hash util.Uint256, ucs *state.UnspentCoin) error {
+	cd.unspents[hash] = ucs
+	return nil
+}
+
 // Persist flushes all the changes made into the (supposedly) persistent
 // underlying store.
 func (cd *cachedDao) Persist() (int, error) {
@@ -78,5 +94,11 @@ func (cd *cachedDao) Persist() (int, error) {
 			return 0, err
 		}
 	}
+	for hash := range cd.unspents {
+		err := cd.dao.PutUnspentCoinState(hash, cd.unspents[hash])
+		if err != nil {
+			return 0, err
+		}
+	}
 	return cd.dao.Persist()
 }
diff --git a/pkg/core/dao.go b/pkg/core/dao.go
index d64b1426c..4a2564797 100644
--- a/pkg/core/dao.go
+++ b/pkg/core/dao.go
@@ -175,25 +175,9 @@ func (dao *dao) AppendNEP5Transfer(acc util.Uint160, tr *state.NEP5Transfer) err
 
 // -- start unspent coins.
 
-// GetUnspentCoinStateOrNew gets UnspentCoinState from temporary or persistent Store
-// and return it. If it's not present in both stores, returns a new
-// UnspentCoinState.
-func (dao *dao) GetUnspentCoinStateOrNew(hash util.Uint256) (*UnspentCoinState, error) {
-	unspent, err := dao.GetUnspentCoinState(hash)
-	if err != nil {
-		if err != storage.ErrKeyNotFound {
-			return nil, err
-		}
-		unspent = &UnspentCoinState{
-			states: []state.Coin{},
-		}
-	}
-	return unspent, nil
-}
-
 // GetUnspentCoinState retrieves UnspentCoinState from the given store.
-func (dao *dao) GetUnspentCoinState(hash util.Uint256) (*UnspentCoinState, error) {
-	unspent := &UnspentCoinState{}
+func (dao *dao) GetUnspentCoinState(hash util.Uint256) (*state.UnspentCoin, error) {
+	unspent := &state.UnspentCoin{}
 	key := storage.AppendPrefix(storage.STCoin, hash.BytesLE())
 	err := dao.GetAndDecode(unspent, key)
 	if err != nil {
@@ -203,52 +187,13 @@ func (dao *dao) GetUnspentCoinState(hash util.Uint256) (*UnspentCoinState, error
 }
 
 // PutUnspentCoinState puts given UnspentCoinState into the given store.
-func (dao *dao) PutUnspentCoinState(hash util.Uint256, ucs *UnspentCoinState) error {
+func (dao *dao) PutUnspentCoinState(hash util.Uint256, ucs *state.UnspentCoin) error {
 	key := storage.AppendPrefix(storage.STCoin, hash.BytesLE())
 	return dao.Put(ucs, key)
 }
 
 // -- end unspent coins.
 
-// -- start spent coins.
-
-// GetSpentCoinsOrNew returns spent coins from store.
-func (dao *dao) GetSpentCoinsOrNew(hash util.Uint256, height uint32) (*SpentCoinState, error) {
-	spent, err := dao.GetSpentCoinState(hash)
-	if err != nil {
-		if err != storage.ErrKeyNotFound {
-			return nil, err
-		}
-		spent = NewSpentCoinState(hash, height)
-	}
-	return spent, nil
-}
-
-// GetSpentCoinState gets SpentCoinState from the given store.
-func (dao *dao) GetSpentCoinState(hash util.Uint256) (*SpentCoinState, error) {
-	spent := &SpentCoinState{}
-	key := storage.AppendPrefix(storage.STSpentCoin, hash.BytesLE())
-	err := dao.GetAndDecode(spent, key)
-	if err != nil {
-		return nil, err
-	}
-	return spent, nil
-}
-
-// PutSpentCoinState puts given SpentCoinState into the given store.
-func (dao *dao) PutSpentCoinState(hash util.Uint256, scs *SpentCoinState) error {
-	key := storage.AppendPrefix(storage.STSpentCoin, hash.BytesLE())
-	return dao.Put(scs, key)
-}
-
-// DeleteSpentCoinState deletes given SpentCoinState from the given store.
-func (dao *dao) DeleteSpentCoinState(hash util.Uint256) error {
-	key := storage.AppendPrefix(storage.STSpentCoin, hash.BytesLE())
-	return dao.store.Delete(key)
-}
-
-// -- end spent coins.
-
 // -- start validator.
 
 // GetValidatorStateOrNew gets validator from store or created new one in case of error.
@@ -592,7 +537,7 @@ func (dao *dao) IsDoubleSpend(tx *transaction.Transaction) bool {
 			return false
 		}
 		for _, input := range inputs {
-			if int(input.PrevIndex) >= len(unspent.states) || unspent.states[input.PrevIndex] == state.CoinSpent {
+			if int(input.PrevIndex) >= len(unspent.States) || (unspent.States[input.PrevIndex].State&state.CoinSpent) != 0 {
 				return true
 			}
 		}
@@ -607,13 +552,12 @@ func (dao *dao) IsDoubleClaim(claim *transaction.ClaimTX) bool {
 	}
 	for _, inputs := range transaction.GroupInputsByPrevHash(claim.Claims) {
 		prevHash := inputs[0].PrevHash
-		scs, err := dao.GetSpentCoinState(prevHash)
+		unspent, err := dao.GetUnspentCoinState(prevHash)
 		if err != nil {
 			return true
 		}
 		for _, input := range inputs {
-			_, ok := scs.items[input.PrevIndex]
-			if !ok {
+			if int(input.PrevIndex) >= len(unspent.States) || (unspent.States[input.PrevIndex].State&state.CoinClaimed) != 0 {
 				return true
 			}
 		}
diff --git a/pkg/core/dao_test.go b/pkg/core/dao_test.go
index a854265ff..94125ecd7 100644
--- a/pkg/core/dao_test.go
+++ b/pkg/core/dao_test.go
@@ -94,14 +94,6 @@ func TestDeleteContractState(t *testing.T) {
 	require.Nil(t, gotContractState)
 }
 
-func TestGetUnspentCoinStateOrNew_New(t *testing.T) {
-	dao := newDao(storage.NewMemoryStore())
-	hash := random.Uint256()
-	unspentCoinState, err := dao.GetUnspentCoinStateOrNew(hash)
-	require.NoError(t, err)
-	require.NotNil(t, unspentCoinState)
-}
-
 func TestGetUnspentCoinState_Err(t *testing.T) {
 	dao := newDao(storage.NewMemoryStore())
 	hash := random.Uint256()
@@ -113,7 +105,7 @@ func TestGetUnspentCoinState_Err(t *testing.T) {
 func TestPutGetUnspentCoinState(t *testing.T) {
 	dao := newDao(storage.NewMemoryStore())
 	hash := random.Uint256()
-	unspentCoinState := &UnspentCoinState{states: []state.Coin{}}
+	unspentCoinState := &state.UnspentCoin{Height: 42, States: []state.OutputState{}}
 	err := dao.PutUnspentCoinState(hash, unspentCoinState)
 	require.NoError(t, err)
 	gotUnspentCoinState, err := dao.GetUnspentCoinState(hash)
@@ -121,46 +113,6 @@ func TestPutGetUnspentCoinState(t *testing.T) {
 	require.Equal(t, unspentCoinState, gotUnspentCoinState)
 }
 
-func TestGetSpentCoinStateOrNew_New(t *testing.T) {
-	dao := newDao(storage.NewMemoryStore())
-	hash := random.Uint256()
-	spentCoinState, err := dao.GetSpentCoinsOrNew(hash, 1)
-	require.NoError(t, err)
-	require.NotNil(t, spentCoinState)
-}
-
-func TestPutAndGetSpentCoinState(t *testing.T) {
-	dao := newDao(storage.NewMemoryStore())
-	hash := random.Uint256()
-	spentCoinState := &SpentCoinState{items: make(map[uint16]uint32)}
-	err := dao.PutSpentCoinState(hash, spentCoinState)
-	require.NoError(t, err)
-	gotSpentCoinState, err := dao.GetSpentCoinState(hash)
-	require.NoError(t, err)
-	require.Equal(t, spentCoinState, gotSpentCoinState)
-}
-
-func TestGetSpentCoinState_Err(t *testing.T) {
-	dao := newDao(storage.NewMemoryStore())
-	hash := random.Uint256()
-	spentCoinState, err := dao.GetSpentCoinState(hash)
-	require.Error(t, err)
-	require.Nil(t, spentCoinState)
-}
-
-func TestDeleteSpentCoinState(t *testing.T) {
-	dao := newDao(storage.NewMemoryStore())
-	hash := random.Uint256()
-	spentCoinState := &SpentCoinState{items: make(map[uint16]uint32)}
-	err := dao.PutSpentCoinState(hash, spentCoinState)
-	require.NoError(t, err)
-	err = dao.DeleteSpentCoinState(hash)
-	require.NoError(t, err)
-	gotSpentCoinState, err := dao.GetSpentCoinState(hash)
-	require.Error(t, err)
-	require.Nil(t, gotSpentCoinState)
-}
-
 func TestGetValidatorStateOrNew_New(t *testing.T) {
 	dao := newDao(storage.NewMemoryStore())
 	publicKey := &keys.PublicKey{}
diff --git a/pkg/core/spent_coin.go b/pkg/core/spent_coin.go
new file mode 100644
index 000000000..9d42cb8af
--- /dev/null
+++ b/pkg/core/spent_coin.go
@@ -0,0 +1,10 @@
+package core
+
+import "github.com/nspcc-dev/neo-go/pkg/core/transaction"
+
+// spentCoin represents the state of a single spent coin output.
+type spentCoin struct {
+	Output      *transaction.Output
+	StartHeight uint32
+	EndHeight   uint32
+}
diff --git a/pkg/core/spent_coin_state.go b/pkg/core/spent_coin_state.go
deleted file mode 100644
index b7702f9c6..000000000
--- a/pkg/core/spent_coin_state.go
+++ /dev/null
@@ -1,61 +0,0 @@
-package core
-
-import (
-	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
-	"github.com/nspcc-dev/neo-go/pkg/io"
-	"github.com/nspcc-dev/neo-go/pkg/util"
-)
-
-// SpentCoinState represents the state of a spent coin.
-type SpentCoinState struct {
-	txHash   util.Uint256
-	txHeight uint32
-
-	// A mapping between the index of the prevIndex and block height.
-	items map[uint16]uint32
-}
-
-// spentCoin represents the state of a single spent coin output.
-type spentCoin struct {
-	Output      *transaction.Output
-	StartHeight uint32
-	EndHeight   uint32
-}
-
-// NewSpentCoinState returns a new SpentCoinState object.
-func NewSpentCoinState(hash util.Uint256, height uint32) *SpentCoinState {
-	return &SpentCoinState{
-		txHash:   hash,
-		txHeight: height,
-		items:    make(map[uint16]uint32),
-	}
-}
-
-// DecodeBinary implements Serializable interface.
-func (s *SpentCoinState) DecodeBinary(br *io.BinReader) {
-	br.ReadBytes(s.txHash[:])
-	s.txHeight = br.ReadU32LE()
-
-	s.items = make(map[uint16]uint32)
-	lenItems := br.ReadVarUint()
-	for i := 0; i < int(lenItems); i++ {
-		var (
-			key   uint16
-			value uint32
-		)
-		key = br.ReadU16LE()
-		value = br.ReadU32LE()
-		s.items[key] = value
-	}
-}
-
-// EncodeBinary implements Serializable interface.
-func (s *SpentCoinState) EncodeBinary(bw *io.BinWriter) {
-	bw.WriteBytes(s.txHash[:])
-	bw.WriteU32LE(s.txHeight)
-	bw.WriteVarUint(uint64(len(s.items)))
-	for k, v := range s.items {
-		bw.WriteU16LE(k)
-		bw.WriteU32LE(v)
-	}
-}
diff --git a/pkg/core/spent_coin_state_test.go b/pkg/core/spent_coin_state_test.go
deleted file mode 100644
index b6a289974..000000000
--- a/pkg/core/spent_coin_state_test.go
+++ /dev/null
@@ -1,30 +0,0 @@
-package core
-
-import (
-	"testing"
-
-	"github.com/nspcc-dev/neo-go/pkg/internal/random"
-	"github.com/nspcc-dev/neo-go/pkg/io"
-	"github.com/stretchr/testify/assert"
-)
-
-func TestEncodeDecodeSpentCoinState(t *testing.T) {
-	spent := &SpentCoinState{
-		txHash:   random.Uint256(),
-		txHeight: 1001,
-		items: map[uint16]uint32{
-			1: 3,
-			2: 8,
-			4: 100,
-		},
-	}
-
-	buf := io.NewBufBinWriter()
-	spent.EncodeBinary(buf.BinWriter)
-	assert.Nil(t, buf.Err)
-	spentDecode := new(SpentCoinState)
-	r := io.NewBinReaderFromBuf(buf.Bytes())
-	spentDecode.DecodeBinary(r)
-	assert.Nil(t, r.Err)
-	assert.Equal(t, spent, spentDecode)
-}
diff --git a/pkg/core/state/unspent_coin.go b/pkg/core/state/unspent_coin.go
new file mode 100644
index 000000000..a0f1e635e
--- /dev/null
+++ b/pkg/core/state/unspent_coin.go
@@ -0,0 +1,60 @@
+package state
+
+import (
+	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
+	"github.com/nspcc-dev/neo-go/pkg/io"
+)
+
+// UnspentCoin hold the state of a unspent coin.
+type UnspentCoin struct {
+	Height uint32
+	States []OutputState
+}
+
+// OutputState combines transaction output (UTXO) and its state
+// (spent/claimed...) along with the height of spend (if it's spent).
+type OutputState struct {
+	transaction.Output
+
+	SpendHeight uint32
+	State       Coin
+}
+
+// NewUnspentCoin returns a new unspent coin state with N confirmed states.
+func NewUnspentCoin(height uint32, tx *transaction.Transaction) *UnspentCoin {
+	u := &UnspentCoin{
+		Height: height,
+		States: make([]OutputState, len(tx.Outputs)),
+	}
+	for i := range tx.Outputs {
+		u.States[i] = OutputState{Output: tx.Outputs[i]}
+	}
+	return u
+}
+
+// EncodeBinary encodes UnspentCoin to the given BinWriter.
+func (s *UnspentCoin) EncodeBinary(bw *io.BinWriter) {
+	bw.WriteU32LE(s.Height)
+	bw.WriteArray(s.States)
+	bw.WriteVarUint(uint64(len(s.States)))
+}
+
+// DecodeBinary decodes UnspentCoin from the given BinReader.
+func (s *UnspentCoin) DecodeBinary(br *io.BinReader) {
+	s.Height = br.ReadU32LE()
+	br.ReadArray(&s.States)
+}
+
+// EncodeBinary implements Serializable interface.
+func (o *OutputState) EncodeBinary(w *io.BinWriter) {
+	o.Output.EncodeBinary(w)
+	w.WriteU32LE(o.SpendHeight)
+	w.WriteB(byte(o.State))
+}
+
+// DecodeBinary implements Serializable interface.
+func (o *OutputState) DecodeBinary(r *io.BinReader) {
+	o.Output.DecodeBinary(r)
+	o.SpendHeight = r.ReadU32LE()
+	o.State = Coin(r.ReadB())
+}
diff --git a/pkg/core/state/unspent_coin_test.go b/pkg/core/state/unspent_coin_test.go
new file mode 100644
index 000000000..2c9a9274d
--- /dev/null
+++ b/pkg/core/state/unspent_coin_test.go
@@ -0,0 +1,54 @@
+package state
+
+import (
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
+	"github.com/nspcc-dev/neo-go/pkg/internal/random"
+	"github.com/nspcc-dev/neo-go/pkg/io"
+	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDecodeEncodeUnspentCoin(t *testing.T) {
+	unspent := &UnspentCoin{
+		Height: 100500,
+		States: []OutputState{
+			{
+				Output: transaction.Output{
+					AssetID:    random.Uint256(),
+					Amount:     util.Fixed8(42),
+					ScriptHash: random.Uint160(),
+				},
+				SpendHeight: 201000,
+				State:       CoinSpent,
+			},
+			{
+				Output: transaction.Output{
+					AssetID:    random.Uint256(),
+					Amount:     util.Fixed8(420),
+					ScriptHash: random.Uint160(),
+				},
+				SpendHeight: 0,
+				State:       CoinConfirmed,
+			},
+			{
+				Output: transaction.Output{
+					AssetID:    random.Uint256(),
+					Amount:     util.Fixed8(4200),
+					ScriptHash: random.Uint160(),
+				},
+				SpendHeight: 111000,
+				State:       CoinSpent & CoinClaimed,
+			},
+		},
+	}
+
+	buf := io.NewBufBinWriter()
+	unspent.EncodeBinary(buf.BinWriter)
+	assert.Nil(t, buf.Err)
+	unspentDecode := &UnspentCoin{}
+	r := io.NewBinReaderFromBuf(buf.Bytes())
+	unspentDecode.DecodeBinary(r)
+	assert.Nil(t, r.Err)
+}
diff --git a/pkg/core/unspent_coin_state.go b/pkg/core/unspent_coin_state.go
deleted file mode 100644
index cbcd6a2e8..000000000
--- a/pkg/core/unspent_coin_state.go
+++ /dev/null
@@ -1,39 +0,0 @@
-package core
-
-import (
-	"github.com/nspcc-dev/neo-go/pkg/core/state"
-	"github.com/nspcc-dev/neo-go/pkg/io"
-)
-
-// UnspentCoinState hold the state of a unspent coin.
-type UnspentCoinState struct {
-	states []state.Coin
-}
-
-// NewUnspentCoinState returns a new unspent coin state with N confirmed states.
-func NewUnspentCoinState(n int) *UnspentCoinState {
-	u := &UnspentCoinState{
-		states: make([]state.Coin, n),
-	}
-	for i := 0; i < n; i++ {
-		u.states[i] = state.CoinConfirmed
-	}
-	return u
-}
-
-// EncodeBinary encodes UnspentCoinState to the given BinWriter.
-func (s *UnspentCoinState) EncodeBinary(bw *io.BinWriter) {
-	bw.WriteVarUint(uint64(len(s.states)))
-	for _, state := range s.states {
-		bw.WriteB(byte(state))
-	}
-}
-
-// DecodeBinary decodes UnspentCoinState from the given BinReader.
-func (s *UnspentCoinState) DecodeBinary(br *io.BinReader) {
-	lenStates := br.ReadVarUint()
-	s.states = make([]state.Coin, lenStates)
-	for i := 0; i < int(lenStates); i++ {
-		s.states[i] = state.Coin(br.ReadB())
-	}
-}
diff --git a/pkg/core/unspent_coint_state_test.go b/pkg/core/unspent_coint_state_test.go
deleted file mode 100644
index 98e089f58..000000000
--- a/pkg/core/unspent_coint_state_test.go
+++ /dev/null
@@ -1,29 +0,0 @@
-package core
-
-import (
-	"testing"
-
-	"github.com/nspcc-dev/neo-go/pkg/core/state"
-	"github.com/nspcc-dev/neo-go/pkg/io"
-	"github.com/stretchr/testify/assert"
-)
-
-func TestDecodeEncodeUnspentCoinState(t *testing.T) {
-	unspent := &UnspentCoinState{
-		states: []state.Coin{
-			state.CoinConfirmed,
-			state.CoinSpent,
-			state.CoinSpent,
-			state.CoinSpent,
-			state.CoinConfirmed,
-		},
-	}
-
-	buf := io.NewBufBinWriter()
-	unspent.EncodeBinary(buf.BinWriter)
-	assert.Nil(t, buf.Err)
-	unspentDecode := &UnspentCoinState{}
-	r := io.NewBinReaderFromBuf(buf.Bytes())
-	unspentDecode.DecodeBinary(r)
-	assert.Nil(t, r.Err)
-}
diff --git a/pkg/network/helper_test.go b/pkg/network/helper_test.go
index 985cfde4b..8a1cc258f 100644
--- a/pkg/network/helper_test.go
+++ b/pkg/network/helper_test.go
@@ -8,7 +8,6 @@ import (
 	"time"
 
 	"github.com/nspcc-dev/neo-go/config"
-	"github.com/nspcc-dev/neo-go/pkg/core"
 	"github.com/nspcc-dev/neo-go/pkg/core/block"
 	"github.com/nspcc-dev/neo-go/pkg/core/mempool"
 	"github.com/nspcc-dev/neo-go/pkg/core/state"
@@ -129,7 +128,7 @@ func (chain testChain) GetTransaction(util.Uint256) (*transaction.Transaction, u
 	panic("TODO")
 }
 
-func (chain testChain) GetUnspentCoinState(util.Uint256) *core.UnspentCoinState {
+func (chain testChain) GetUnspentCoinState(util.Uint256) *state.UnspentCoin {
 	panic("TODO")
 }