diff --git a/csi.proto b/csi.proto
index e449e336..4b75507f 100644
--- a/csi.proto
+++ b/csi.proto
@@ -270,6 +270,30 @@ message VolumeHandle {
   // Since this field MAY contain sensitive information, the CO MUST NOT
   // leak this information to untrusted entities.
   map<string, string> metadata = 2;
+
+  // Checksum is the MD5 checksum of the handle's ID and metadata. The
+  // checksum should be calculated by writing the handle's ID to a
+  // buffer followed by writing the metadata's key/value pairs to the
+  // same buffer where the keys are sorted lexicographically.
+  //
+  // For example, take the following handle:
+  //
+  //         id =       "vol-00"
+  //         metadata = {"region":"US","alerts":"false","name":"MyVol"}
+  //
+  // The buffer used to calculate the checksum for the above handle
+  // would look like this:
+  //
+  //         vol-00alertsfalsenameMyVolregionUS
+  //
+  // The MD5 checksum for the above handle is therefore
+  // 81504c01d43ab67052fca49012875537.
+  //
+  // This field is REQUIRED.
+  //
+  // Since this field is a hash of information that MAY be sensitive,
+  // the CO MUST NOT leak this information to untrusted entities.
+  string checksum = 3;
 }
 
 // A standard way to encode credential data. The total bytes of the
diff --git a/lib/go/csi/csi.pb.go b/lib/go/csi/csi.pb.go
index d6f99f91..9184d6a6 100644
--- a/lib/go/csi/csi.pb.go
+++ b/lib/go/csi/csi.pb.go
@@ -1746,6 +1746,29 @@ type VolumeHandle struct {
 	// Since this field MAY contain sensitive information, the CO MUST NOT
 	// leak this information to untrusted entities.
 	Metadata map[string]string `protobuf:"bytes,2,rep,name=metadata" json:"metadata,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value"`
+	// Checksum is the MD5 checksum of the handle's ID and metadata. The
+	// checksum should be calculated by writing the handle's ID to a
+	// buffer followed by writing the metadata's key/value pairs to the
+	// same buffer where the keys are sorted lexicographically.
+	//
+	// For example, take the following handle:
+	//
+	//         id =       "vol-00"
+	//         metadata = {"region":"US","alerts":"false","name":"MyVol"}
+	//
+	// The buffer used to calculate the checksum for the above handle
+	// would look like this:
+	//
+	//         vol-00alertsfalsenameMyVolregionUS
+	//
+	// The MD5 checksum for the above handle is therefore
+	// 81504c01d43ab67052fca49012875537.
+	//
+	// This field is REQUIRED.
+	//
+	// Since this field is a hash of information that MAY be sensitive,
+	// the CO MUST NOT leak this information to untrusted entities.
+	Checksum string `protobuf:"bytes,3,opt,name=checksum" json:"checksum,omitempty"`
 }
 
 func (m *VolumeHandle) Reset()                    { *m = VolumeHandle{} }
@@ -1767,6 +1790,13 @@ func (m *VolumeHandle) GetMetadata() map[string]string {
 	return nil
 }
 
+func (m *VolumeHandle) GetChecksum() string {
+	if m != nil {
+		return m.Checksum
+	}
+	return ""
+}
+
 // A standard way to encode credential data. The total bytes of the
 // values in the Data field must be less than 1 Mebibyte.
 type Credentials struct {
@@ -5636,207 +5666,208 @@ var _Node_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("csi.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
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+	0xcc, 0xb3, 0x75, 0x33, 0xcd, 0xde, 0x72, 0xa5, 0xd9, 0x2b, 0xb3, 0x65, 0x9d, 0x09, 0x76, 0xcd,
+	0x27, 0xc1, 0xda, 0x49, 0xf0, 0x77, 0x57, 0x20, 0x46, 0x00, 0x41, 0xaf, 0x42, 0xfa, 0x48, 0xed,
+	0xab, 0x9a, 0xd2, 0x95, 0x4d, 0xcc, 0xcc, 0x4e, 0x6e, 0x4c, 0x30, 0xcb, 0x95, 0x4c, 0xbe, 0x05,
+	0xe0, 0xea, 0x91, 0xe3, 0x1b, 0x89, 0xb0, 0xd6, 0x22, 0x57, 0x2b, 0x56, 0x42, 0x73, 0x22, 0xbf,
+	0xe5, 0xd0, 0xe2, 0xbc, 0x80, 0xb1, 0x54, 0x65, 0x5a, 0x5e, 0x22, 0xd6, 0xd7, 0x26, 0xc7, 0x85,
+	0x6e, 0x7d, 0x91, 0x29, 0x7d, 0xce, 0x43, 0x45, 0x5b, 0x5f, 0xdb, 0x4b, 0x44, 0x43, 0xd8, 0x6e,
+	0xd9, 0x55, 0x89, 0xec, 0x49, 0xbe, 0xa6, 0xee, 0xa8, 0x63, 0x9e, 0xd1, 0xbe, 0xfa, 0x9f, 0x69,
+	0x59, 0x66, 0xb6, 0x5a, 0x33, 0xf8, 0x68, 0x0c, 0x97, 0x1d, 0x16, 0x47, 0x7d, 0x5f, 0x9b, 0x66,
+	0x2a, 0xbe, 0xe9, 0x6b, 0xd3, 0x13, 0x71, 0x2d, 0xab, 0x97, 0x5a, 0x33, 0x5b, 0xa0, 0x63, 0xe0,
+	0xc7, 0x74, 0x17, 0x2d, 0xfb, 0x6c, 0x5e, 0xa8, 0x61, 0xf3, 0x44, 0xf0, 0x53, 0x0e, 0xc3, 0xc1,
+	0x5b, 0x6f, 0xcb, 0xf2, 0xf6, 0x78, 0x76, 0x13, 0xf4, 0x36, 0x6c, 0x92, 0x50, 0xe8, 0x3b, 0xd4,
+	0x84, 0xe3, 0x46, 0xca, 0xb4, 0x38, 0x95, 0xcb, 0x2d, 0x43, 0xe7, 0xfb, 0xbe, 0x1c, 0xd4, 0x86,
+	0x0b, 0x44, 0x7f, 0x00, 0x98, 0x2b, 0xc4, 0xc2, 0x15, 0x8f, 0x85, 0x00, 0x18, 0xb3, 0xfd, 0x00,
+	0x1e, 0x12, 0x80, 0x1d, 0xe2, 0xe0, 0x29, 0x13, 0x5b, 0xa6, 0xea, 0x24, 0x51, 0xbd, 0xe9, 0x50,
+	0x6d, 0xc7, 0x57, 0x4b, 0xe1, 0x99, 0xa1, 0x8b, 0x82, 0xf6, 0x21, 0x83, 0xb3, 0x38, 0xcd, 0x0d,
+	0x54, 0x0f, 0x4c, 0xe9, 0xb1, 0xf3, 0x91, 0xad, 0xe7, 0x88, 0x52, 0xda, 0x84, 0xc2, 0xfd, 0x28,
+	0x0c, 0xab, 0xce, 0xa5, 0x87, 0x37, 0x93, 0x44, 0x99, 0xdc, 0x9a, 0x5c, 0x82, 0xdd, 0x08, 0x58,
+	0xa7, 0xae, 0x8f, 0x02, 0xce, 0x06, 0x49, 0xd5, 0xfa, 0x89, 0x3e, 0x0b, 0xeb, 0x2d, 0x85, 0xcc,
+	0xce, 0xde, 0x48, 0xc7, 0x3d, 0x35, 0x64, 0x4d, 0x35, 0xb4, 0x63, 0xb2, 0x6a, 0x57, 0x24, 0x64,
+	0x32, 0x0f, 0x47, 0xba, 0x21, 0x0e, 0x0c, 0x09, 0x73, 0xd0, 0xf3, 0x90, 0x31, 0x6d, 0xb7, 0x55,
+	0xbd, 0xa5, 0x75, 0x86, 0x06, 0x8e, 0xf3, 0x66, 0x8d, 0xc2, 0x12, 0x46, 0x71, 0x42, 0xe7, 0x9f,
+	0xe0, 0x94, 0xee, 0x36, 0xef, 0xae, 0xf3, 0xd3, 0x90, 0x6c, 0x8a, 0x45, 0x61, 0xbf, 0x2c, 0x0a,
+	0x45, 0x96, 0x41, 0xdb, 0x70, 0xa1, 0x29, 0xd6, 0x9b, 0xb5, 0x5a, 0x55, 0x6a, 0x08, 0x45, 0x59,
+	0x12, 0xde, 0x68, 0x0a, 0xb8, 0x9a, 0x17, 0xa4, 0x7a, 0xb9, 0x2a, 0xd2, 0x2b, 0xb7, 0x72, 0xbd,
+	0x5e, 0x16, 0x4b, 0x84, 0x59, 0x96, 0x84, 0xa2, 0xbc, 0x5f, 0x16, 0x2a, 0x45, 0x36, 0xc2, 0x7d,
+	0x23, 0x02, 0x99, 0xa9, 0xd8, 0x82, 0xde, 0xf0, 0xc1, 0x6a, 0x77, 0x56, 0x34, 0x9a, 0xa6, 0x78,
+	0x51, 0xf3, 0x85, 0x20, 0x1c, 0x00, 0xc1, 0xbf, 0x19, 0x58, 0xf7, 0xd5, 0x38, 0xbd, 0xe1, 0xc9,
+	0x57, 0x2a, 0xb2, 0x58, 0x6d, 0xc8, 0xe5, 0xc3, 0x5a, 0x45, 0x38, 0x14, 0xc4, 0x06, 0xc1, 0x64,
+	0x07, 0xb6, 0xaa, 0x35, 0x41, 0xca, 0x37, 0xca, 0x55, 0x51, 0xae, 0x09, 0x62, 0x11, 0x0f, 0x7e,
+	0xbf, 0x2a, 0x4d, 0x36, 0x3d, 0x1b, 0xb0, 0x56, 0x16, 0xef, 0xe7, 0x2b, 0xe5, 0x22, 0xa5, 0xc9,
+	0x62, 0xfe, 0x50, 0x60, 0x23, 0xe8, 0x12, 0x70, 0x4e, 0x38, 0xad, 0x3d, 0x90, 0x2c, 0xe5, 0xc5,
+	0x92, 0xc0, 0x46, 0xd1, 0x26, 0xac, 0x53, 0x81, 0x7c, 0x45, 0x12, 0xf2, 0xc5, 0x07, 0xb2, 0xf0,
+	0x56, 0xb9, 0xde, 0xa8, 0xb3, 0x31, 0x74, 0x11, 0x36, 0x9d, 0xa2, 0xb5, 0xbc, 0x94, 0x3f, 0x14,
+	0x1a, 0x82, 0x24, 0xdf, 0x13, 0x1e, 0xb0, 0x71, 0x74, 0x01, 0x36, 0x2c, 0x93, 0x13, 0xd6, 0xfd,
+	0x7c, 0xa5, 0x29, 0xb0, 0x09, 0xee, 0xa7, 0x61, 0xc8, 0x4c, 0x05, 0xe5, 0xb9, 0x8e, 0x98, 0x92,
+	0x98, 0xa6, 0x2c, 0xe5, 0x88, 0xef, 0x31, 0xb0, 0xee, 0xab, 0xf1, 0xe9, 0x39, 0x62, 0x13, 0xd6,
+	0x3d, 0x8e, 0x38, 0xc8, 0x8b, 0xc5, 0x0a, 0x76, 0xc5, 0x04, 0xea, 0x62, 0x55, 0xa8, 0x13, 0xed,
+	0x04, 0x6b, 0x36, 0xca, 0xfd, 0x3a, 0x0a, 0x5b, 0xb3, 0xf2, 0x0c, 0x3a, 0xf2, 0x41, 0xee, 0x60,
+	0xc1, 0x24, 0x35, 0x93, 0xb9, 0x0c, 0x9e, 0xe8, 0x3a, 0xac, 0xd0, 0xc8, 0x66, 0x9d, 0x67, 0xb9,
+	0xca, 0xde, 0x84, 0x59, 0xf6, 0xea, 0xfc, 0xdf, 0xc2, 0xce, 0x93, 0x1b, 0xff, 0x4e, 0x3c, 0x63,
+	0x17, 0xa0, 0x2d, 0xc8, 0x7a, 0x16, 0x02, 0x3d, 0x59, 0x10, 0x8a, 0x6c, 0x0c, 0xaf, 0x2f, 0x72,
+	0x4f, 0xef, 0x11, 0x8b, 0xa3, 0xf3, 0x80, 0x0e, 0xf3, 0x6f, 0xc9, 0xf9, 0x46, 0x23, 0x5f, 0x38,
+	0x10, 0x8a, 0xe4, 0x36, 0xbf, 0xce, 0x26, 0xf0, 0xea, 0x70, 0x2e, 0x9e, 0xc3, 0x6a, 0x53, 0x6c,
+	0xc8, 0xfb, 0x95, 0x7c, 0xa9, 0xce, 0x26, 0xbd, 0x4c, 0x6a, 0xb7, 0xf1, 0xa0, 0x26, 0xb0, 0x80,
+	0x4d, 0x39, 0x99, 0xfb, 0x75, 0x93, 0x91, 0x42, 0x6b, 0x70, 0xd6, 0x1a, 0x17, 0xe9, 0x4b, 0xb9,
+	0xc8, 0xae, 0x70, 0x7f, 0x8e, 0x38, 0x6f, 0x3c, 0x7d, 0x53, 0xd9, 0x13, 0x9f, 0xb9, 0x53, 0x59,
+	0xb8, 0xd8, 0x98, 0xc3, 0x5e, 0x6a, 0x3d, 0x7e, 0x27, 0x0c, 0xfc, 0x7c, 0xf5, 0xcf, 0x7a, 0x66,
+	0x04, 0xf8, 0x3e, 0xe6, 0xe7, 0x90, 0x38, 0xba, 0x09, 0xd7, 0xac, 0x08, 0x5c, 0x6d, 0x4c, 0xe6,
+	0x45, 0xa3, 0x2a, 0xd7, 0x6b, 0x42, 0xa1, 0xbc, 0x5f, 0xa6, 0x93, 0x84, 0x4d, 0xa0, 0x73, 0xc0,
+	0x52, 0x39, 0x3b, 0x93, 0xb1, 0x2b, 0xdc, 0x7f, 0xc2, 0xb0, 0x3d, 0xa7, 0x0c, 0x43, 0x3d, 0x1f,
+	0x97, 0x8a, 0x8b, 0x97, 0x71, 0xf3, 0xf8, 0x4b, 0x39, 0xf5, 0x37, 0x0c, 0x5c, 0x59, 0x40, 0xbf,
+	0xdb, 0xab, 0x81, 0xf0, 0x33, 0xb3, 0x56, 0x52, 0x78, 0xd6, 0x4a, 0x8a, 0x04, 0xad, 0xa4, 0xa8,
+	0x4f, 0xb6, 0x2c, 0x8b, 0xfb, 0x55, 0x36, 0xc6, 0xbd, 0x17, 0x81, 0xf3, 0xfe, 0x05, 0x29, 0xfa,
+	0x92, 0x0f, 0xe4, 0x2f, 0xcf, 0xad, 0x63, 0x03, 0xc8, 0x4b, 0x01, 0xfc, 0x11, 0x3d, 0x9b, 0x5a,
+	0x24, 0x8e, 0xce, 0x5b, 0x13, 0x4c, 0x30, 0xf2, 0xe1, 0x59, 0xc8, 0x47, 0x66, 0x21, 0x1f, 0x0d,
+	0x42, 0x3e, 0x86, 0xce, 0x42, 0xca, 0x54, 0x23, 0x48, 0x52, 0x55, 0x62, 0xe3, 0xc1, 0x4b, 0x32,
+	0xc1, 0xfd, 0x3e, 0x6c, 0x1e, 0xce, 0xfa, 0x06, 0x35, 0xd9, 0xc7, 0x1d, 0xaf, 0x2f, 0x50, 0xf4,
+	0x07, 0x32, 0x96, 0x2d, 0x2c, 0xb6, 0x66, 0x29, 0x7e, 0x8a, 0x4e, 0xc9, 0x40, 0xba, 0x29, 0x3a,
+	0x31, 0x8c, 0x04, 0x63, 0x18, 0xe5, 0xfe, 0xc5, 0xc0, 0x19, 0xf7, 0x26, 0x05, 0xdd, 0xf3, 0x41,
+	0xee, 0xd3, 0x81, 0x7b, 0x1a, 0xcf, 0xe7, 0x52, 0x28, 0xbd, 0x0d, 0x68, 0x5a, 0x9b, 0x1b, 0x9a,
+	0x75, 0xc8, 0xec, 0xe5, 0x8b, 0x72, 0xad, 0xd2, 0x2c, 0x95, 0x45, 0xb9, 0x50, 0x15, 0xf7, 0xcb,
+	0x25, 0x96, 0x41, 0x57, 0x61, 0x67, 0xaa, 0xe6, 0x3f, 0xa8, 0xd6, 0x1b, 0x72, 0x51, 0xc0, 0xf8,
+	0x09, 0x62, 0xe1, 0x01, 0x1b, 0x26, 0x83, 0x75, 0xef, 0xa4, 0xe6, 0x0e, 0xd6, 0xdd, 0xdc, 0xf3,
+	0xb9, 0xec, 0x60, 0xa7, 0xb5, 0x3d, 0xbd, 0xc1, 0xee, 0x25, 0xe8, 0xfd, 0xde, 0xee, 0xcf, 0x19,
+	0x58, 0x29, 0x93, 0xb3, 0x5d, 0xe3, 0x18, 0x7d, 0x99, 0xbc, 0x1c, 0x9f, 0x7a, 0x2b, 0x8f, 0x76,
+	0x66, 0x3c, 0xa3, 0x27, 0x47, 0x76, 0xdc, 0xe5, 0xb9, 0x0f, 0xed, 0xf9, 0x10, 0x3a, 0x80, 0xb4,
+	0xeb, 0x09, 0x36, 0xda, 0xf4, 0x7b, 0x96, 0x6d, 0x2a, 0xe4, 0x82, 0x5f, 0x6c, 0xf3, 0xa1, 0xdd,
+	0x0f, 0x63, 0x00, 0x93, 0xd4, 0x8f, 0x04, 0x58, 0x75, 0xee, 0x90, 0x50, 0x36, 0xe8, 0x09, 0x32,
+	0xb7, 0x19, 0xf8, 0x82, 0x97, 0x0f, 0x61, 0x35, 0xce, 0xfa, 0x9e, 0xaa, 0xf1, 0x79, 0x52, 0x47,
+	0xd5, 0xf8, 0x3d, 0x46, 0xe3, 0x43, 0xe8, 0x11, 0x6c, 0x04, 0x94, 0xab, 0xe8, 0xca, 0xec, 0x77,
+	0x4e, 0xa6, 0xf2, 0xab, 0x8b, 0x3c, 0x86, 0xe2, 0x43, 0xa8, 0x0b, 0x9b, 0x81, 0xe5, 0x0f, 0xba,
+	0x36, 0xef, 0xe9, 0x89, 0x69, 0xeb, 0xfa, 0x62, 0x2f, 0x54, 0xf8, 0x10, 0x1a, 0x00, 0x17, 0x9c,
+	0x97, 0xd1, 0xf5, 0xb9, 0x4f, 0x2f, 0x4c, 0x7b, 0xcf, 0x2d, 0xf8, 0x44, 0x83, 0x0f, 0xa1, 0x3d,
+	0x48, 0x39, 0xde, 0x01, 0xa0, 0x8d, 0xe9, 0x97, 0x01, 0xa6, 0xca, 0x6c, 0xd0, 0x93, 0x01, 0x53,
+	0x87, 0xe3, 0x06, 0x9a, 0xea, 0x98, 0xbe, 0x2f, 0xa7, 0x3a, 0x7c, 0x2e, 0xab, 0xbd, 0x30, 0x7b,
+	0x0e, 0x8e, 0xa7, 0x60, 0xf6, 0x3f, 0xd1, 0x9e, 0x82, 0x39, 0xe0, 0xfc, 0x99, 0x0f, 0xed, 0x7e,
+	0x3b, 0x02, 0x51, 0xbc, 0xec, 0x51, 0x03, 0x32, 0x53, 0x69, 0x1a, 0x5d, 0x0c, 0xba, 0xc0, 0x32,
+	0xcd, 0x5c, 0x9a, 0x7d, 0xbf, 0xc5, 0x87, 0xd0, 0x17, 0x61, 0xcd, 0x27, 0xd3, 0xa0, 0xed, 0xe0,
+	0x3b, 0x1a, 0x53, 0xf3, 0xce, 0xbc, 0x4b, 0x1c, 0x3e, 0x84, 0x5e, 0x86, 0xa4, 0x1d, 0xb3, 0xd0,
+	0xba, 0xf7, 0xa6, 0xc4, 0xd4, 0x73, 0xde, 0xff, 0x02, 0xc5, 0x94, 0xb6, 0xc3, 0x3b, 0x95, 0xf6,
+	0x5e, 0x72, 0x50, 0xe9, 0xa9, 0x6b, 0x89, 0xc9, 0xb8, 0xbc, 0xee, 0xd9, 0x0e, 0x3e, 0xf1, 0xf7,
+	0x8e, 0x2b, 0xd0, 0x25, 0x0f, 0xe3, 0xe4, 0x0f, 0x4a, 0x9f, 0xfb, 0x6f, 0x00, 0x00, 0x00, 0xff,
+	0xff, 0xef, 0xff, 0xa1, 0xf7, 0xad, 0x34, 0x00, 0x00,
 }
diff --git a/spec.md b/spec.md
index e830c093..19a6df5c 100644
--- a/spec.md
+++ b/spec.md
@@ -565,6 +565,30 @@ message VolumeHandle {
   // Since this field MAY contain sensitive information, the CO MUST NOT
   // leak this information to untrusted entities.
   map<string, string> metadata = 2;
+
+  // Checksum is the MD5 checksum of the handle's ID and metadata. The
+  // checksum should be calculated by writing the handle's ID to a
+  // buffer followed by writing the metadata's key/value pairs to the
+  // same buffer where the keys are sorted lexicographically.
+  //
+  // For example, take the following handle:
+  //
+  //         id =       "vol-00"
+  //         metadata = {"region":"US","alerts":"false","name":"MyVol"}
+  //
+  // The buffer used to calculate the checksum for the above handle
+  // would look like this:
+  //
+  //         vol-00alertsfalsenameMyVolregionUS
+  //
+  // The MD5 checksum for the above handle is therefore
+  // 81504c01d43ab67052fca49012875537.
+  //
+  // This field is REQUIRED.
+  //
+  // Since this field is a hash of information that MAY be sensitive,
+  // the CO MUST NOT leak this information to untrusted entities.
+  string checksum = 3;
 }
 
 // A standard way to encode credential data. The total bytes of the