diff --git a/pkg/core/state/account.go b/pkg/core/state/account.go
index 2fc3a4f66..4e65ec27e 100644
--- a/pkg/core/state/account.go
+++ b/pkg/core/state/account.go
@@ -49,7 +49,7 @@ func NewAccount(scriptHash util.Uint160) *Account {
 // DecodeBinary decodes Account from the given BinReader.
 func (s *Account) DecodeBinary(br *io.BinReader) {
 	s.Version = uint8(br.ReadB())
-	br.ReadBytes(s.ScriptHash[:])
+	s.ScriptHash.DecodeBinary(br)
 	s.IsFrozen = br.ReadBool()
 
 	s.Balances = make(map[util.Uint256][]UnspentBalance)
@@ -73,7 +73,7 @@ func (s *Account) DecodeBinary(br *io.BinReader) {
 // EncodeBinary encodes Account to the given BinWriter.
 func (s *Account) EncodeBinary(bw *io.BinWriter) {
 	bw.WriteB(byte(s.Version))
-	bw.WriteBytes(s.ScriptHash[:])
+	s.ScriptHash.EncodeBinary(bw)
 	bw.WriteBool(s.IsFrozen)
 
 	bw.WriteVarUint(uint64(len(s.Balances)))
diff --git a/pkg/core/state/asset.go b/pkg/core/state/asset.go
index 0b624516b..d59deba68 100644
--- a/pkg/core/state/asset.go
+++ b/pkg/core/state/asset.go
@@ -37,11 +37,11 @@ func (a *Asset) DecodeBinary(br *io.BinReader) {
 	a.Available.DecodeBinary(br)
 	a.Precision = uint8(br.ReadB())
 	a.FeeMode = uint8(br.ReadB())
-	br.ReadBytes(a.FeeAddress[:])
+	a.FeeAddress.DecodeBinary(br)
 
 	a.Owner.DecodeBinary(br)
-	br.ReadBytes(a.Admin[:])
-	br.ReadBytes(a.Issuer[:])
+	a.Admin.DecodeBinary(br)
+	a.Issuer.DecodeBinary(br)
 	a.Expiration = br.ReadU32LE()
 	a.IsFrozen = br.ReadBool()
 }
@@ -55,12 +55,12 @@ func (a *Asset) EncodeBinary(bw *io.BinWriter) {
 	a.Available.EncodeBinary(bw)
 	bw.WriteB(byte(a.Precision))
 	bw.WriteB(byte(a.FeeMode))
-	bw.WriteBytes(a.FeeAddress[:])
+	a.FeeAddress.EncodeBinary(bw)
 
 	a.Owner.EncodeBinary(bw)
 
-	bw.WriteBytes(a.Admin[:])
-	bw.WriteBytes(a.Issuer[:])
+	a.Admin.EncodeBinary(bw)
+	a.Issuer.EncodeBinary(bw)
 	bw.WriteU32LE(a.Expiration)
 	bw.WriteBool(a.IsFrozen)
 }
diff --git a/pkg/core/state/notification_event.go b/pkg/core/state/notification_event.go
index 2599f781e..06e634464 100644
--- a/pkg/core/state/notification_event.go
+++ b/pkg/core/state/notification_event.go
@@ -28,13 +28,13 @@ type AppExecResult struct {
 
 // EncodeBinary implements the Serializable interface.
 func (ne *NotificationEvent) EncodeBinary(w *io.BinWriter) {
-	w.WriteBytes(ne.ScriptHash[:])
+	ne.ScriptHash.EncodeBinary(w)
 	vm.EncodeBinaryStackItem(ne.Item, w)
 }
 
 // DecodeBinary implements the Serializable interface.
 func (ne *NotificationEvent) DecodeBinary(r *io.BinReader) {
-	r.ReadBytes(ne.ScriptHash[:])
+	ne.ScriptHash.DecodeBinary(r)
 	ne.Item = vm.DecodeBinaryStackItem(r)
 }
 
diff --git a/pkg/core/transaction/register.go b/pkg/core/transaction/register.go
index 0351b040d..c17eccb26 100644
--- a/pkg/core/transaction/register.go
+++ b/pkg/core/transaction/register.go
@@ -57,7 +57,7 @@ func (tx *RegisterTX) DecodeBinary(br *io.BinReader) {
 
 	tx.Owner.DecodeBinary(br)
 
-	br.ReadBytes(tx.Admin[:])
+	tx.Admin.DecodeBinary(br)
 }
 
 // EncodeBinary implements Serializable interface.
@@ -67,7 +67,7 @@ func (tx *RegisterTX) EncodeBinary(bw *io.BinWriter) {
 	tx.Amount.EncodeBinary(bw)
 	bw.WriteB(byte(tx.Precision))
 	bw.WriteBytes(tx.Owner.Bytes())
-	bw.WriteBytes(tx.Admin[:])
+	tx.Admin.EncodeBinary(bw)
 }
 
 // registeredAsset is a wrapper for RegisterTransaction
diff --git a/pkg/core/transaction/transaction.go b/pkg/core/transaction/transaction.go
index cc83cb086..185ee1e57 100644
--- a/pkg/core/transaction/transaction.go
+++ b/pkg/core/transaction/transaction.go
@@ -112,7 +112,7 @@ func (t *Transaction) DecodeBinary(br *io.BinReader) {
 	t.Type = TXType(br.ReadB())
 	t.Version = uint8(br.ReadB())
 	t.Nonce = br.ReadU32LE()
-	br.ReadBytes(t.Sender[:])
+	t.Sender.DecodeBinary(br)
 
 	t.ValidUntilBlock = br.ReadU32LE()
 	t.decodeData(br)
@@ -174,7 +174,7 @@ func (t *Transaction) encodeHashableFields(bw *io.BinWriter) {
 	bw.WriteB(byte(t.Type))
 	bw.WriteB(byte(t.Version))
 	bw.WriteU32LE(t.Nonce)
-	bw.WriteBytes(t.Sender[:])
+	t.Sender.EncodeBinary(bw)
 	bw.WriteU32LE(t.ValidUntilBlock)
 
 	// Underlying TXer.
diff --git a/pkg/util/uint160.go b/pkg/util/uint160.go
index 1e457d323..736d1fe78 100644
--- a/pkg/util/uint160.go
+++ b/pkg/util/uint160.go
@@ -5,6 +5,8 @@ import (
 	"encoding/json"
 	"fmt"
 	"strings"
+
+	"github.com/nspcc-dev/neo-go/pkg/io"
 )
 
 // Uint160Size is the size of Uint160 in bytes.
@@ -131,3 +133,13 @@ func (u *Uint160) UnmarshalJSON(data []byte) (err error) {
 func (u Uint160) MarshalJSON() ([]byte, error) {
 	return []byte(`"0x` + u.StringLE() + `"`), nil
 }
+
+// EncodeBinary implements Serializable interface.
+func (u *Uint160) EncodeBinary(bw *io.BinWriter) {
+	bw.WriteBytes(u[:])
+}
+
+// DecodeBinary implements Serializable interface.
+func (u *Uint160) DecodeBinary(br *io.BinReader) {
+	br.ReadBytes(u[:])
+}