diff --git a/pkg/crypto/keys/publickey.go b/pkg/crypto/keys/publickey.go
index 56c3f4a48..b1e3748c2 100644
--- a/pkg/crypto/keys/publickey.go
+++ b/pkg/crypto/keys/publickey.go
@@ -12,7 +12,6 @@ import (
 
 	"github.com/btcsuite/btcd/btcec"
 	lru "github.com/hashicorp/golang-lru"
-	"github.com/nspcc-dev/neo-go/pkg/core/interop/interopnames"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
 	"github.com/nspcc-dev/neo-go/pkg/encoding/address"
 	"github.com/nspcc-dev/neo-go/pkg/io"
@@ -319,8 +318,7 @@ func (p *PublicKey) GetVerificationScript() []byte {
 		buf.WriteB(0xAC) // CHECKSIG
 		return buf.Bytes()
 	}
-	emit.Bytes(buf.BinWriter, b)
-	emit.Syscall(buf.BinWriter, interopnames.SystemCryptoCheckSig)
+	emit.CheckSig(buf.BinWriter, b)
 
 	return buf.Bytes()
 }
diff --git a/pkg/vm/emit/emit.go b/pkg/vm/emit/emit.go
index bff6807fd..1a8450f3f 100644
--- a/pkg/vm/emit/emit.go
+++ b/pkg/vm/emit/emit.go
@@ -219,6 +219,14 @@ func AppCall(w *io.BinWriter, scriptHash util.Uint160, operation string, f callf
 	AppCallNoArgs(w, scriptHash, operation, f)
 }
 
+// CheckSig emits a single-key verification script using given []bytes as a key.
+// It does not check for key correctness, so you can get an invalid script if the
+// data passed is not really a public key.
+func CheckSig(w *io.BinWriter, key []byte) {
+	Bytes(w, key)
+	Syscall(w, interopnames.SystemCryptoCheckSig)
+}
+
 func isInstructionJmp(op opcode.Opcode) bool {
 	return opcode.JMP <= op && op <= opcode.CALLL || op == opcode.ENDTRYL
 }