diff --git a/pkg/consensus/consensus.go b/pkg/consensus/consensus.go
index f01cdf6a0..2ced9fca8 100644
--- a/pkg/consensus/consensus.go
+++ b/pkg/consensus/consensus.go
@@ -201,12 +201,12 @@ var (
 func NewPayload(m netmode.Magic, stateRootEnabled bool) *Payload {
 	return &Payload{
 		Extensible: npayload.Extensible{
-			Network:  m,
 			Category: Category,
 		},
 		message: message{
 			stateRootEnabled: stateRootEnabled,
 		},
+		network: m,
 	}
 }
 
diff --git a/pkg/consensus/payload.go b/pkg/consensus/payload.go
index ffcaf24fc..f06d0a54c 100644
--- a/pkg/consensus/payload.go
+++ b/pkg/consensus/payload.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 
 	"github.com/nspcc-dev/dbft/payload"
+	"github.com/nspcc-dev/neo-go/pkg/config/netmode"
 	"github.com/nspcc-dev/neo-go/pkg/io"
 	npayload "github.com/nspcc-dev/neo-go/pkg/network/payload"
 	"github.com/nspcc-dev/neo-go/pkg/util"
@@ -28,6 +29,7 @@ type (
 	Payload struct {
 		npayload.Extensible
 		message
+		network netmode.Magic
 	}
 )
 
@@ -128,7 +130,7 @@ func (p *Payload) EncodeBinary(w *io.BinWriter) {
 // It also sets corresponding verification and invocation scripts.
 func (p *Payload) Sign(key *privateKey) error {
 	p.encodeData()
-	sig := key.SignHash(p.GetSignedHash())
+	sig := key.PrivateKey.SignHashable(uint32(p.network), &p.Extensible)
 
 	buf := io.NewBufBinWriter()
 	emit.Bytes(buf.BinWriter, sig)
@@ -138,22 +140,6 @@ func (p *Payload) Sign(key *privateKey) error {
 	return nil
 }
 
-// GetSignedPart implements crypto.Verifiable interface.
-func (p *Payload) GetSignedPart() []byte {
-	if p.Extensible.Data == nil {
-		p.encodeData()
-	}
-	return p.Extensible.GetSignedPart()
-}
-
-// GetSignedHash returns a hash of the payload used to verify it.
-func (p *Payload) GetSignedHash() util.Uint256 {
-	if p.Extensible.Data == nil {
-		p.encodeData()
-	}
-	return p.Extensible.GetSignedHash()
-}
-
 // Hash implements payload.ConsensusPayload interface.
 func (p *Payload) Hash() util.Uint256 {
 	if p.Extensible.Data == nil {
diff --git a/pkg/consensus/payload_test.go b/pkg/consensus/payload_test.go
index 7a313dd42..f5d6175b9 100644
--- a/pkg/consensus/payload_test.go
+++ b/pkg/consensus/payload_test.go
@@ -79,7 +79,7 @@ func TestConsensusPayload_Setters(t *testing.T) {
 func TestConsensusPayload_Serializable(t *testing.T) {
 	for _, mt := range messageTypes {
 		p := randomPayload(t, mt)
-		actual := &Payload{Extensible: npayload.Extensible{Network: netmode.UnitTestNet}}
+		actual := &Payload{Extensible: npayload.Extensible{}, network: netmode.UnitTestNet}
 		data, err := testserdes.EncodeBinary(p)
 		require.NoError(t, err)
 		require.NoError(t, testserdes.DecodeBinary(data, &actual.Extensible))
@@ -158,12 +158,12 @@ func randomPayload(t *testing.T, mt messageType) *Payload {
 			payload:        randomMessage(t, mt),
 		},
 		Extensible: npayload.Extensible{
-			Network: netmode.UnitTestNet,
 			Witness: transaction.Witness{
 				InvocationScript:   random.Bytes(3),
 				VerificationScript: []byte{byte(opcode.PUSH0)},
 			},
 		},
+		network: netmode.UnitTestNet,
 	}
 
 	if mt == changeViewType {
diff --git a/pkg/consensus/recovery_message.go b/pkg/consensus/recovery_message.go
index f24376cb8..6f8b66f2d 100644
--- a/pkg/consensus/recovery_message.go
+++ b/pkg/consensus/recovery_message.go
@@ -298,7 +298,6 @@ func fromPayload(t messageType, recovery *Payload, p io.Serializable) *Payload {
 	return &Payload{
 		Extensible: npayload.Extensible{
 			Category:      Category,
-			Network:       recovery.Network,
 			ValidBlockEnd: recovery.BlockIndex,
 		},
 		message: message{
@@ -308,5 +307,6 @@ func fromPayload(t messageType, recovery *Payload, p io.Serializable) *Payload {
 			payload:          p,
 			stateRootEnabled: recovery.stateRootEnabled,
 		},
+		network: recovery.network,
 	}
 }
diff --git a/pkg/network/message.go b/pkg/network/message.go
index 80fbb68ba..6bb05e380 100644
--- a/pkg/network/message.go
+++ b/pkg/network/message.go
@@ -147,7 +147,7 @@ func (m *Message) decodePayload() error {
 	case CMDBlock:
 		p = block.New(m.StateRootInHeader)
 	case CMDExtensible:
-		p = payload.NewExtensible(m.Network)
+		p = payload.NewExtensible()
 	case CMDP2PNotaryRequest:
 		p = &payload.P2PNotaryRequest{Network: m.Network}
 	case CMDGetBlocks:
diff --git a/pkg/network/payload/extensible.go b/pkg/network/payload/extensible.go
index ab09f2cb5..529a8dc37 100644
--- a/pkg/network/payload/extensible.go
+++ b/pkg/network/payload/extensible.go
@@ -4,7 +4,6 @@ import (
 	"errors"
 	"math"
 
-	"github.com/nspcc-dev/neo-go/pkg/config/netmode"
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
 	"github.com/nspcc-dev/neo-go/pkg/io"
@@ -18,8 +17,6 @@ const (
 
 // Extensible represents payload containing arbitrary data.
 type Extensible struct {
-	// Network represents network magic.
-	Network netmode.Magic
 	// Category is payload type.
 	Category string
 	// ValidBlockStart is starting height for payload to be valid.
@@ -33,16 +30,14 @@ type Extensible struct {
 	// Witness is payload witness.
 	Witness transaction.Witness
 
-	hash       util.Uint256
-	signedHash util.Uint256
-	signedpart []byte
+	hash util.Uint256
 }
 
 var errInvalidPadding = errors.New("invalid padding")
 
 // NewExtensible creates new extensible payload.
-func NewExtensible(network netmode.Magic) *Extensible {
-	return &Extensible{Network: network}
+func NewExtensible() *Extensible {
+	return &Extensible{}
 }
 
 func (e *Extensible) encodeBinaryUnsigned(w *io.BinWriter) {
@@ -81,22 +76,6 @@ func (e *Extensible) DecodeBinary(r *io.BinReader) {
 	e.Witness.DecodeBinary(r)
 }
 
-// GetSignedPart implements crypto.Verifiable.
-func (e *Extensible) GetSignedPart() []byte {
-	if e.signedpart == nil {
-		e.createHash()
-	}
-	return e.signedpart
-}
-
-// GetSignedHash implements crypto.Verifiable.
-func (e *Extensible) GetSignedHash() util.Uint256 {
-	if e.signedHash.Equals(util.Uint256{}) {
-		e.createHash()
-	}
-	return e.signedHash
-}
-
 // Hash returns payload hash.
 func (e *Extensible) Hash() util.Uint256 {
 	if e.hash.Equals(util.Uint256{}) {
@@ -110,14 +89,4 @@ func (e *Extensible) createHash() {
 	buf := io.NewBufBinWriter()
 	e.encodeBinaryUnsigned(buf.BinWriter)
 	e.hash = hash.Sha256(buf.Bytes())
-	e.updateSignedPart()
-	e.signedHash = hash.Sha256(e.signedpart)
-}
-
-// updateSignedPart updates serialized message if needed.
-func (e *Extensible) updateSignedPart() {
-	buf := io.NewBufBinWriter()
-	buf.WriteU32LE(uint32(e.Network))
-	buf.WriteBytes(e.hash[:])
-	e.signedpart = buf.Bytes()
 }
diff --git a/pkg/network/payload/extensible_test.go b/pkg/network/payload/extensible_test.go
index 88ae45189..f1f6b28c8 100644
--- a/pkg/network/payload/extensible_test.go
+++ b/pkg/network/payload/extensible_test.go
@@ -7,7 +7,6 @@ import (
 
 	"github.com/nspcc-dev/neo-go/internal/random"
 	"github.com/nspcc-dev/neo-go/internal/testserdes"
-	"github.com/nspcc-dev/neo-go/pkg/config/netmode"
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
 	"github.com/nspcc-dev/neo-go/pkg/io"
 	"github.com/stretchr/testify/require"
@@ -54,23 +53,13 @@ func TestExtensible_Serializable(t *testing.T) {
 
 func TestExtensible_Hashes(t *testing.T) {
 	getExtensiblePair := func() (*Extensible, *Extensible) {
-		p1 := NewExtensible(netmode.UnitTestNet)
+		p1 := NewExtensible()
 		p1.Data = []byte{1, 2, 3}
-		p2 := NewExtensible(netmode.UnitTestNet)
+		p2 := NewExtensible()
 		p2.Data = []byte{3, 2, 1}
 		return p1, p2
 	}
 
-	t.Run("GetSignedPart", func(t *testing.T) {
-		p1, p2 := getExtensiblePair()
-		require.NotEqual(t, p1.GetSignedPart(), p2.GetSignedPart())
-		require.NotEqual(t, p1.GetSignedPart(), p2.GetSignedPart())
-	})
-	t.Run("GetSignedHash", func(t *testing.T) {
-		p1, p2 := getExtensiblePair()
-		require.NotEqual(t, p1.GetSignedHash(), p2.GetSignedHash())
-		require.NotEqual(t, p1.GetSignedHash(), p2.GetSignedHash())
-	})
 	t.Run("Hash", func(t *testing.T) {
 		p1, p2 := getExtensiblePair()
 		require.NotEqual(t, p1.Hash(), p2.Hash())
diff --git a/pkg/network/server_test.go b/pkg/network/server_test.go
index 0f30f8771..ff0d4ab70 100644
--- a/pkg/network/server_test.go
+++ b/pkg/network/server_test.go
@@ -407,7 +407,7 @@ func TestConsensus(t *testing.T) {
 	p.handshaked = true
 
 	newConsensusMessage := func(start, end uint32) *Message {
-		pl := payload.NewExtensible(netmode.UnitTestNet)
+		pl := payload.NewExtensible()
 		pl.Category = consensus.Category
 		pl.ValidBlockStart = start
 		pl.ValidBlockEnd = end
@@ -438,7 +438,7 @@ func TestConsensus(t *testing.T) {
 		require.Error(t, s.handleMessage(p, msg))
 	})
 	t.Run("invalid category", func(t *testing.T) {
-		pl := payload.NewExtensible(netmode.UnitTestNet)
+		pl := payload.NewExtensible()
 		pl.Category = "invalid"
 		pl.ValidBlockEnd = s.chain.BlockHeight() + 1
 		msg := NewMessage(CMDExtensible, pl)
@@ -706,7 +706,7 @@ func TestInv(t *testing.T) {
 		require.Equal(t, []util.Uint256{hs[0], hs[2]}, actual)
 	})
 	t.Run("extensible", func(t *testing.T) {
-		ep := payload.NewExtensible(netmode.UnitTestNet)
+		ep := payload.NewExtensible()
 		s.chain.(*fakechain.FakeChain).VerifyWitnessF = func() error { return nil }
 		ep.ValidBlockEnd = s.chain.(*fakechain.FakeChain).BlockHeight() + 1
 		ok, err := s.extensiblePool.Add(ep)
diff --git a/pkg/services/stateroot/network.go b/pkg/services/stateroot/network.go
index 9f72b7758..203478b17 100644
--- a/pkg/services/stateroot/network.go
+++ b/pkg/services/stateroot/network.go
@@ -81,7 +81,6 @@ func (s *service) sendValidatedRoot(r *state.MPTRoot, priv *keys.PrivateKey) {
 	m := NewMessage(s.Network, RootT, r)
 	m.EncodeBinary(w.BinWriter)
 	ep := &payload.Extensible{
-		Network:         s.Network,
 		ValidBlockStart: r.Index,
 		ValidBlockEnd:   r.Index + transaction.MaxValidUntilBlockIncrement,
 		Sender:          priv.GetScriptHash(),
@@ -90,7 +89,7 @@ func (s *service) sendValidatedRoot(r *state.MPTRoot, priv *keys.PrivateKey) {
 			VerificationScript: s.getAccount().GetVerificationScript(),
 		},
 	}
-	sig := priv.SignHash(ep.GetSignedHash())
+	sig := priv.SignHashable(uint32(s.Network), ep)
 	buf := io.NewBufBinWriter()
 	emit.Bytes(buf.BinWriter, sig)
 	ep.Witness.InvocationScript = buf.Bytes()
diff --git a/pkg/services/stateroot/validators.go b/pkg/services/stateroot/validators.go
index 298afc1ca..2e48bacc5 100644
--- a/pkg/services/stateroot/validators.go
+++ b/pkg/services/stateroot/validators.go
@@ -68,7 +68,6 @@ func (s *service) signAndSend(r *state.MPTRoot) error {
 		return w.Err
 	}
 	e := &payload.Extensible{
-		Network:         s.Network,
 		ValidBlockStart: r.Index,
 		ValidBlockEnd:   r.Index + transaction.MaxValidUntilBlockIncrement,
 		Sender:          s.getAccount().PrivateKey().GetScriptHash(),
@@ -77,7 +76,7 @@ func (s *service) signAndSend(r *state.MPTRoot) error {
 			VerificationScript: s.getAccount().GetVerificationScript(),
 		},
 	}
-	sig = acc.PrivateKey().SignHash(e.GetSignedHash())
+	sig = acc.PrivateKey().SignHashable(uint32(s.Network), e)
 	buf := io.NewBufBinWriter()
 	emit.Bytes(buf.BinWriter, sig)
 	e.Witness.InvocationScript = buf.Bytes()