diff --git a/object/sign.go b/object/sign.go
new file mode 100644
index 0000000..1dc5bd0
--- /dev/null
+++ b/object/sign.go
@@ -0,0 +1,45 @@
+package object
+
+// SignedData returns marshaled payload of the Put request.
+//
+// If payload is nil, ErrHeaderNotFound returns.
+func (m PutRequest) SignedData() ([]byte, error) {
+	r := m.GetR()
+	if r == nil {
+		return nil, ErrHeaderNotFound
+	}
+
+	data := make([]byte, r.Size())
+
+	if _, err := r.MarshalTo(data); err != nil {
+		return nil, err
+	}
+
+	return data, nil
+}
+
+// ReadSignedData copies marshaled payload of the Put request to passed buffer.
+//
+// If payload is nil, ErrHeaderNotFound returns.
+func (m PutRequest) ReadSignedData(p []byte) error {
+	r := m.GetR()
+	if r == nil {
+		return ErrHeaderNotFound
+	}
+
+	_, err := r.MarshalTo(p)
+
+	return err
+}
+
+// SignedDataSize returns the size of payload of the Put request.
+//
+// If payload is nil, -1 returns.
+func (m PutRequest) SignedDataSize() int {
+	r := m.GetR()
+	if r == nil {
+		return -1
+	}
+
+	return r.Size()
+}
diff --git a/object/sign_test.go b/object/sign_test.go
new file mode 100644
index 0000000..2574d9c
--- /dev/null
+++ b/object/sign_test.go
@@ -0,0 +1,79 @@
+package object
+
+import (
+	"testing"
+
+	"github.com/nspcc-dev/neofs-api-go/service"
+	"github.com/nspcc-dev/neofs-crypto/test"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSignVerifyRequests(t *testing.T) {
+	sk := test.DecodeKey(0)
+
+	type sigType interface {
+		service.SignedDataWithToken
+		service.SignKeyPairAccumulator
+		service.SignKeyPairSource
+		SetToken(*Token)
+	}
+
+	items := []struct {
+		constructor func() sigType
+		bodyCorrupt []func(sigType)
+	}{
+		{ // PutRequest.PutHeader
+			constructor: func() sigType {
+				return MakePutRequestHeader(new(Object))
+			},
+			bodyCorrupt: []func(sigType){
+				func(s sigType) {
+					obj := s.(*PutRequest).GetR().(*PutRequest_Header).Header.GetObject()
+					obj.SystemHeader.PayloadLength++
+				},
+			},
+		},
+		{ // PutRequest.Chunk
+			constructor: func() sigType {
+				return MakePutRequestChunk(make([]byte, 10))
+			},
+			bodyCorrupt: []func(sigType){
+				func(s sigType) {
+					h := s.(*PutRequest).GetR().(*PutRequest_Chunk)
+					h.Chunk[0]++
+				},
+			},
+		},
+	}
+
+	for _, item := range items {
+		{ // token corruptions
+			v := item.constructor()
+
+			token := new(Token)
+			v.SetToken(token)
+
+			require.NoError(t, service.SignDataWithSessionToken(sk, v))
+
+			require.NoError(t, service.VerifyAccumulatedSignaturesWithToken(v))
+
+			token.SetSessionKey(append(token.GetSessionKey(), 1))
+
+			require.Error(t, service.VerifyAccumulatedSignaturesWithToken(v))
+		}
+
+		{ // body corruptions
+			for _, corruption := range item.bodyCorrupt {
+				v := item.constructor()
+
+				require.NoError(t, service.SignDataWithSessionToken(sk, v))
+
+				require.NoError(t, service.VerifyAccumulatedSignaturesWithToken(v))
+
+				corruption(v)
+
+				require.Error(t, service.VerifyAccumulatedSignaturesWithToken(v))
+			}
+		}
+	}
+}