diff --git a/pkg/smartcontract/manifest/group.go b/pkg/smartcontract/manifest/group.go
new file mode 100644
index 000000000..96d02eaf0
--- /dev/null
+++ b/pkg/smartcontract/manifest/group.go
@@ -0,0 +1,95 @@
+package manifest
+
+import (
+	"crypto/elliptic"
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+
+	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
+)
+
+// Group represents a group of smartcontracts identified by a public key.
+// Every SC in a group must provide signature of it's hash to prove
+// it belongs to a group.
+type Group struct {
+	PublicKey *keys.PublicKey `json:"pubkey"`
+	Signature []byte          `json:"signature"`
+}
+
+type groupAux struct {
+	PublicKey string `json:"pubkey"`
+	Signature []byte `json:"signature"`
+}
+
+// IsValid checks whether group's signature corresponds to the given hash.
+func (g *Group) IsValid(h util.Uint160) error {
+	if !g.PublicKey.Verify(g.Signature, hash.Sha256(h.BytesBE()).BytesBE()) {
+		return errors.New("incorrect group signature")
+	}
+	return nil
+}
+
+// MarshalJSON implements json.Marshaler interface.
+func (g *Group) MarshalJSON() ([]byte, error) {
+	aux := &groupAux{
+		PublicKey: hex.EncodeToString(g.PublicKey.Bytes()),
+		Signature: g.Signature,
+	}
+	return json.Marshal(aux)
+}
+
+// UnmarshalJSON implements json.Unmarshaler interface.
+func (g *Group) UnmarshalJSON(data []byte) error {
+	aux := new(groupAux)
+	if err := json.Unmarshal(data, aux); err != nil {
+		return err
+	}
+	b, err := hex.DecodeString(aux.PublicKey)
+	if err != nil {
+		return err
+	}
+	pub := new(keys.PublicKey)
+	if err := pub.DecodeBytes(b); err != nil {
+		return err
+	}
+	g.PublicKey = pub
+	g.Signature = aux.Signature
+	return nil
+}
+
+// ToStackItem converts Group to stackitem.Item.
+func (g *Group) ToStackItem() stackitem.Item {
+	return stackitem.NewStruct([]stackitem.Item{
+		stackitem.NewByteArray(g.PublicKey.Bytes()),
+		stackitem.NewByteArray(g.Signature),
+	})
+}
+
+// FromStackItem converts stackitem.Item to Group.
+func (g *Group) FromStackItem(item stackitem.Item) error {
+	if item.Type() != stackitem.StructT {
+		return errors.New("invalid Group stackitem type")
+	}
+	group := item.Value().([]stackitem.Item)
+	if len(group) != 2 {
+		return errors.New("invalid Group stackitem length")
+	}
+	pKey, err := group[0].TryBytes()
+	if err != nil {
+		return err
+	}
+	g.PublicKey, err = keys.NewPublicKeyFromBytes(pKey, elliptic.P256())
+	if err != nil {
+		return err
+	}
+	sig, err := group[1].TryBytes()
+	if err != nil {
+		return err
+	}
+	g.Signature = sig
+	return nil
+}
diff --git a/pkg/smartcontract/manifest/method.go b/pkg/smartcontract/manifest/method.go
index e56a89165..f6e99175f 100644
--- a/pkg/smartcontract/manifest/method.go
+++ b/pkg/smartcontract/manifest/method.go
@@ -1,15 +1,9 @@
 package manifest
 
 import (
-	"crypto/elliptic"
-	"encoding/hex"
-	"encoding/json"
 	"errors"
 
-	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
-	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
-	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 )
 
@@ -25,19 +19,6 @@ type Event struct {
 	Parameters []Parameter `json:"parameters"`
 }
 
-// Group represents a group of smartcontracts identified by a public key.
-// Every SC in a group must provide signature of it's hash to prove
-// it belongs to a group.
-type Group struct {
-	PublicKey *keys.PublicKey `json:"pubkey"`
-	Signature []byte          `json:"signature"`
-}
-
-type groupAux struct {
-	PublicKey string `json:"pubkey"`
-	Signature []byte `json:"signature"`
-}
-
 // Method represents method's metadata.
 type Method struct {
 	Name       string                  `json:"name"`
@@ -55,75 +36,6 @@ func NewParameter(name string, typ smartcontract.ParamType) Parameter {
 	}
 }
 
-// IsValid checks whether group's signature corresponds to the given hash.
-func (g *Group) IsValid(h util.Uint160) error {
-	if !g.PublicKey.Verify(g.Signature, hash.Sha256(h.BytesBE()).BytesBE()) {
-		return errors.New("incorrect group signature")
-	}
-	return nil
-}
-
-// MarshalJSON implements json.Marshaler interface.
-func (g *Group) MarshalJSON() ([]byte, error) {
-	aux := &groupAux{
-		PublicKey: hex.EncodeToString(g.PublicKey.Bytes()),
-		Signature: g.Signature,
-	}
-	return json.Marshal(aux)
-}
-
-// UnmarshalJSON implements json.Unmarshaler interface.
-func (g *Group) UnmarshalJSON(data []byte) error {
-	aux := new(groupAux)
-	if err := json.Unmarshal(data, aux); err != nil {
-		return err
-	}
-	b, err := hex.DecodeString(aux.PublicKey)
-	if err != nil {
-		return err
-	}
-	pub := new(keys.PublicKey)
-	if err := pub.DecodeBytes(b); err != nil {
-		return err
-	}
-	g.PublicKey = pub
-	g.Signature = aux.Signature
-	return nil
-}
-
-// ToStackItem converts Group to stackitem.Item.
-func (g *Group) ToStackItem() stackitem.Item {
-	return stackitem.NewStruct([]stackitem.Item{
-		stackitem.NewByteArray(g.PublicKey.Bytes()),
-		stackitem.NewByteArray(g.Signature),
-	})
-}
-
-// FromStackItem converts stackitem.Item to Group.
-func (g *Group) FromStackItem(item stackitem.Item) error {
-	if item.Type() != stackitem.StructT {
-		return errors.New("invalid Group stackitem type")
-	}
-	group := item.Value().([]stackitem.Item)
-	if len(group) != 2 {
-		return errors.New("invalid Group stackitem length")
-	}
-	pKey, err := group[0].TryBytes()
-	if err != nil {
-		return err
-	}
-	g.PublicKey, err = keys.NewPublicKeyFromBytes(pKey, elliptic.P256())
-	if err != nil {
-		return err
-	}
-	sig, err := group[1].TryBytes()
-	if err != nil {
-		return err
-	}
-	g.Signature = sig
-	return nil
-}
-
 // ToStackItem converts Method to stackitem.Item.
 func (m *Method) ToStackItem() stackitem.Item {
 	params := make([]stackitem.Item, len(m.Parameters))