core/state: merge spent and unspent coins state, use it to store more things

This change reduces pressure on DB by doing the following things:
 * not storing additional KV pair for SpentCoin
 * storing Output right in the UnspentCoin, thus eliminating the need to get a
   full transaction from DB

At the same time it makes UnspentCoin more fat and hot, but it should probably
worth it.

Also drop `GetUnspentCoinStateOrNew` as it shouldn't ever existed, UTXOs
can't come out of nowhere.

1.5M block import time (VerifyBlocks disabled) on AMD Ryzen 5 1600/16GB/HDD,
before:
real    302m9.895s
user    96m17.200s
sys     13m37.084s

after:
real    159m16.551s
user    69m58.279s
sys     7m34.334s

So it's almost two-fold which is a great improvement.

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(), state.NewUnspentCoin(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)
+			unspent, err := cache.GetUnspentCoinState(prevHash)
-			if err != nil {
-				return fmt.Errorf("could not find previous TX: %s", prevHash)
-			}
-			unspent, err := cache.GetUnspentCoinStateOrNew(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
+				if len(unspent.States) <= int(input.PrevIndex) {
-				prevTXOutput := prevTX.Outputs[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 len(scs.States) <= int(input.PrevIndex) {
-					if !ok {
+						err = errors.New("invalid claim index")
-						err = errors.New("no spent coin state")
+					} 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 {
@@ -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
@@ -1430,17 +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)
+		unspent, err := bc.dao.GetUnspentCoinState(h)
-		if err != nil || len(claimable) == 0 {
+		if err != nil {
-			return 0, errors.New("no unclaimed inputs")
+			return 0, err
 		}
 
 		for _, c := range group {
-			s, ok := claimable[c.PrevIndex]
+			if len(unspent.States) <= int(c.PrevIndex) {
-			if !ok {
 				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,
+			})
 		}
 	}
 
@@ -1460,29 +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
@@ -1714,20 +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)

pkg/core/dao.go

@@ -175,20 +175,6 @@ 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) (*state.UnspentCoin, error) {
-	unspent, err := dao.GetUnspentCoinState(hash)
-	if err != nil {
-		if err != storage.ErrKeyNotFound {
-			return nil, err
-		}
-		unspent = state.NewUnspentCoin(0)
-	}
-	return unspent, nil
-}
-
 // GetUnspentCoinState retrieves UnspentCoinState from the given store.
 func (dao *dao) GetUnspentCoinState(hash util.Uint256) (*state.UnspentCoin, error) {
 	unspent := &state.UnspentCoin{}
@@ -208,45 +194,6 @@ func (dao *dao) PutUnspentCoinState(hash util.Uint256, ucs *state.UnspentCoin) e
 
 // -- end unspent coins.
 
-// -- start spent coins.
-
-// GetSpentCoinsOrNew returns spent coins from store.
-func (dao *dao) GetSpentCoinsOrNew(hash util.Uint256, height uint32) (*state.SpentCoin, error) {
-	spent, err := dao.GetSpentCoinState(hash)
-	if err != nil {
-		if err != storage.ErrKeyNotFound {
-			return nil, err
-		}
-		spent = state.NewSpentCoin(height)
-	}
-	return spent, nil
-}
-
-// GetSpentCoinState gets SpentCoinState from the given store.
-func (dao *dao) GetSpentCoinState(hash util.Uint256) (*state.SpentCoin, error) {
-	spent := &state.SpentCoin{}
-	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 *state.SpentCoin) 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.
@@ -590,7 +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) != 0 {
+			if int(input.PrevIndex) >= len(unspent.States) || (unspent.States[input.PrevIndex].State&state.CoinSpent) != 0 {
 				return true
 			}
 		}
@@ -605,13 +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 int(input.PrevIndex) >= len(unspent.States) || (unspent.States[input.PrevIndex].State&state.CoinClaimed) != 0 {
-			if !ok {
 				return true
 			}
 		}

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 := &state.UnspentCoin{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 := &state.SpentCoin{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 := &state.SpentCoin{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{}

pkg/core/state/spent_coin.go

@@ -1,46 +0,0 @@
-package state
-
-import "github.com/nspcc-dev/neo-go/pkg/io"
-
-// SpentCoin represents the state of a spent coin.
-type SpentCoin struct {
-	TxHeight uint32
-
-	// A mapping between the index of the prevIndex and block height.
-	Items map[uint16]uint32
-}
-
-// NewSpentCoin returns a new SpentCoin object.
-func NewSpentCoin(height uint32) *SpentCoin {
-	return &SpentCoin{
-		TxHeight: height,
-		Items:    make(map[uint16]uint32),
-	}
-}
-
-// DecodeBinary implements Serializable interface.
-func (s *SpentCoin) DecodeBinary(br *io.BinReader) {
-	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 *SpentCoin) EncodeBinary(bw *io.BinWriter) {
-	bw.WriteU32LE(s.TxHeight)
-	bw.WriteVarUint(uint64(len(s.Items)))
-	for k, v := range s.Items {
-		bw.WriteU16LE(k)
-		bw.WriteU32LE(v)
-	}
-}

pkg/core/state/spent_coin_test.go

@@ -1,28 +0,0 @@
-package state
-
-import (
-	"testing"
-
-	"github.com/nspcc-dev/neo-go/pkg/io"
-	"github.com/stretchr/testify/assert"
-)
-
-func TestEncodeDecodeSpentCoin(t *testing.T) {
-	spent := &SpentCoin{
-		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(SpentCoin)
-	r := io.NewBinReaderFromBuf(buf.Bytes())
-	spentDecode.DecodeBinary(r)
-	assert.Nil(t, r.Err)
-	assert.Equal(t, spent, spentDecode)
-}

pkg/core/state/unspent_coin.go

@@ -1,38 +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 {
-	States []Coin
+	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(n int) *UnspentCoin {
+func NewUnspentCoin(height uint32, tx *transaction.Transaction) *UnspentCoin {
 	u := &UnspentCoin{
-		States: make([]Coin, n),
+		Height: height,
+		States: make([]OutputState, len(tx.Outputs)),
 	}
-	for i := 0; i < n; i++ {
+	for i := range tx.Outputs {
-		u.States[i] = CoinConfirmed
+		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)))
-	for _, state := range s.States {
-		bw.WriteB(byte(state))
-	}
 }
 
 // DecodeBinary decodes UnspentCoin from the given BinReader.
 func (s *UnspentCoin) DecodeBinary(br *io.BinReader) {
-	lenStates := br.ReadVarUint()
+	s.Height = br.ReadU32LE()
-	s.States = make([]Coin, lenStates)
+	br.ReadArray(&s.States)
-	for i := 0; i < int(lenStates); i++ {
+}
-		s.States[i] = Coin(br.ReadB())
+
-	}
+// 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())
 }

pkg/core/state/unspent_coin_test.go

@@ -3,18 +3,44 @@ 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{
-		States: []Coin{
+		Height: 100500,
-			CoinConfirmed,
+		States: []OutputState{
-			CoinSpent,
+			{
-			CoinSpent,
+				Output: transaction.Output{
-			CoinSpent,
+					AssetID:    random.Uint256(),
-			CoinConfirmed,
+					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,
+			},
 		},
 	}