diff --git a/pkg/neotest/basic.go b/pkg/neotest/basic.go
index c64a6b4a2..c789d7ae6 100644
--- a/pkg/neotest/basic.go
+++ b/pkg/neotest/basic.go
@@ -301,8 +301,9 @@ func AddNetworkFee(t testing.TB, bc *core.Blockchain, tx *transaction.Transactio
 	baseFee := bc.GetBaseExecFee()
 	size := io.GetVarSize(tx)
 	for _, sgr := range signers {
-		if csgr, ok := sgr.(ContractSigner); ok {
-			sc, err := csgr.InvocationScript(tx)
+		csgr, ok := sgr.(SingleSigner)
+		if ok && csgr.Account().Contract.InvocationBuilder != nil {
+			sc, err := csgr.Account().Contract.InvocationBuilder(tx)
 			require.NoError(t, err)
 
 			txCopy := *tx
diff --git a/pkg/neotest/signer.go b/pkg/neotest/signer.go
index 8446e177f..a8793cc6a 100644
--- a/pkg/neotest/signer.go
+++ b/pkg/neotest/signer.go
@@ -2,7 +2,6 @@ package neotest
 
 import (
 	"bytes"
-	"errors"
 	"fmt"
 	"sort"
 	"testing"
@@ -11,6 +10,7 @@ import (
 	"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/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/encoding/address"
 	"github.com/nspcc-dev/neo-go/pkg/io"
 	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/nspcc-dev/neo-go/pkg/vm"
@@ -47,13 +47,6 @@ type MultiSigner interface {
 	Single(n int) SingleSigner
 }
 
-// ContractSigner is an interface for contract signer.
-type ContractSigner interface {
-	Signer
-	// InvocationScript returns an invocation script to be used as invocation script for contract-based witness.
-	InvocationScript(tx *transaction.Transaction) ([]byte, error)
-}
-
 // signer represents a simple-signature signer.
 type signer wallet.Account
 
@@ -190,33 +183,30 @@ func checkMultiSigner(t testing.TB, s Signer) {
 	}
 }
 
-type contractSigner struct {
-	params     func(tx *transaction.Transaction) []any
-	scriptHash util.Uint160
-}
+type contractSigner wallet.Account
 
 // NewContractSigner returns a contract signer for the provided contract hash.
 // getInvParams must return params to be used as invocation script for contract-based witness.
-func NewContractSigner(h util.Uint160, getInvParams func(tx *transaction.Transaction) []any) ContractSigner {
+func NewContractSigner(h util.Uint160, getInvParams func(tx *transaction.Transaction) []any) SingleSigner {
 	return &contractSigner{
-		scriptHash: h,
-		params:     getInvParams,
+		Address: address.Uint160ToString(h),
+		Contract: &wallet.Contract{
+			Deployed: true,
+			InvocationBuilder: func(tx *transaction.Transaction) ([]byte, error) {
+				params := getInvParams(tx)
+				script := io.NewBufBinWriter()
+				for i := range params {
+					emit.Any(script.BinWriter, params[i])
+				}
+				if script.Err != nil {
+					return nil, script.Err
+				}
+				return script.Bytes(), nil
+			},
+		},
 	}
 }
 
-// InvocationScript implements ContractSigner.
-func (s *contractSigner) InvocationScript(tx *transaction.Transaction) ([]byte, error) {
-	params := s.params(tx)
-	script := io.NewBufBinWriter()
-	for i := range params {
-		emit.Any(script.BinWriter, params[i])
-	}
-	if script.Err != nil {
-		return nil, script.Err
-	}
-	return script.Bytes(), nil
-}
-
 // Script implements ContractSigner.
 func (s *contractSigner) Script() []byte {
 	return []byte{}
@@ -224,7 +214,12 @@ func (s *contractSigner) Script() []byte {
 
 // ScriptHash implements ContractSigner.
 func (s *contractSigner) ScriptHash() util.Uint160 {
-	return s.scriptHash
+	return s.Account().ScriptHash()
+}
+
+// ScriptHash implements ContractSigner.
+func (s *contractSigner) Account() *wallet.Account {
+	return (*wallet.Account)(s)
 }
 
 // SignHashable implements ContractSigner.
@@ -234,27 +229,7 @@ func (s *contractSigner) SignHashable(uint32, hash.Hashable) []byte {
 
 // SignTx implements ContractSigner.
 func (s *contractSigner) SignTx(magic netmode.Magic, tx *transaction.Transaction) error {
-	pos := -1
-	for idx := range tx.Signers {
-		if tx.Signers[idx].Account.Equals(s.ScriptHash()) {
-			pos = idx
-			break
-		}
-	}
-	if pos < 0 {
-		return fmt.Errorf("signer %s not found", s.ScriptHash().String())
-	}
-	if len(tx.Scripts) < pos {
-		return errors.New("transaction is not yet signed by the previous signer")
-	}
-	invoc, err := s.InvocationScript(tx)
-	if err != nil {
-		return err
-	}
-	if len(tx.Scripts) == pos {
-		tx.Scripts = append(tx.Scripts, transaction.Witness{})
-	}
-	tx.Scripts[pos].InvocationScript = invoc
-	tx.Scripts[pos].VerificationScript = s.Script()
-	return nil
+	// Here we rely on `len(s.Contract.Parameters) == 0` being after the `s.Contract.InvocationBuilder != nil` check,
+	// because we cannot determine the list of parameters unless we already have tx.
+	return s.Account().SignTx(magic, tx)
 }