diff --git a/commonspace/spacesyncproto/errors.go b/commonspace/spacesyncproto/errors.go
index 56ac0446..0760c70b 100644
--- a/commonspace/spacesyncproto/errors.go
+++ b/commonspace/spacesyncproto/errors.go
@@ -8,9 +8,11 @@ import (
 var (
 	errGroup = rpcerr.ErrGroup(ErrCodes_ErrorOffset)
 
-	ErrUnexpected      = errGroup.Register(errors.New("unexpected error"), uint64(ErrCodes_Unexpected))
-	ErrSpaceMissing    = errGroup.Register(errors.New("space is missing"), uint64(ErrCodes_SpaceMissing))
-	ErrSpaceExists     = errGroup.Register(errors.New("space exists"), uint64(ErrCodes_SpaceExists))
-	ErrSpaceNotInCache = errGroup.Register(errors.New("space not in cache"), uint64(ErrCodes_SpaceNotInCache))
-	ErrSpaceIsDeleted  = errGroup.Register(errors.New("space is deleted"), uint64(ErrCodes_SpaceIsDeleted))
+	ErrUnexpected           = errGroup.Register(errors.New("unexpected error"), uint64(ErrCodes_Unexpected))
+	ErrSpaceMissing         = errGroup.Register(errors.New("space is missing"), uint64(ErrCodes_SpaceMissing))
+	ErrSpaceExists          = errGroup.Register(errors.New("space exists"), uint64(ErrCodes_SpaceExists))
+	ErrSpaceNotInCache      = errGroup.Register(errors.New("space not in cache"), uint64(ErrCodes_SpaceNotInCache))
+	ErrSpaceIsDeleted       = errGroup.Register(errors.New("space is deleted"), uint64(ErrCodes_SpaceIsDeleted))
+	ErrPeerIsNotResponsible = errGroup.Register(errors.New("peer is not responsible for space"), uint64(ErrCodes_PeerIsNotResponsible))
+	ErrReceiptInvalid       = errGroup.Register(errors.New("space receipt is not valid"), uint64(ErrCodes_ReceiptIsInvalid))
 )
diff --git a/commonspace/spacesyncproto/protos/spacesync.proto b/commonspace/spacesyncproto/protos/spacesync.proto
index 3bf03320..d5b461cf 100644
--- a/commonspace/spacesyncproto/protos/spacesync.proto
+++ b/commonspace/spacesyncproto/protos/spacesync.proto
@@ -9,6 +9,8 @@ enum ErrCodes {
     SpaceExists = 2;
     SpaceNotInCache = 3;
     SpaceIsDeleted = 4;
+    PeerIsNotResponsible = 5;
+    ReceiptIsInvalid = 6;
     ErrorOffset = 100;
 }
 
diff --git a/commonspace/spacesyncproto/spacesync.pb.go b/commonspace/spacesyncproto/spacesync.pb.go
index bb5b0e6e..33caed5b 100644
--- a/commonspace/spacesyncproto/spacesync.pb.go
+++ b/commonspace/spacesyncproto/spacesync.pb.go
@@ -25,12 +25,14 @@ const _ = proto.GoGoProtoPackageIsVersion3 // please upgrade the proto package
 type ErrCodes int32
 
 const (
-	ErrCodes_Unexpected      ErrCodes = 0
-	ErrCodes_SpaceMissing    ErrCodes = 1
-	ErrCodes_SpaceExists     ErrCodes = 2
-	ErrCodes_SpaceNotInCache ErrCodes = 3
-	ErrCodes_SpaceIsDeleted  ErrCodes = 4
-	ErrCodes_ErrorOffset     ErrCodes = 100
+	ErrCodes_Unexpected           ErrCodes = 0
+	ErrCodes_SpaceMissing         ErrCodes = 1
+	ErrCodes_SpaceExists          ErrCodes = 2
+	ErrCodes_SpaceNotInCache      ErrCodes = 3
+	ErrCodes_SpaceIsDeleted       ErrCodes = 4
+	ErrCodes_PeerIsNotResponsible ErrCodes = 5
+	ErrCodes_ReceiptIsInvalid     ErrCodes = 6
+	ErrCodes_ErrorOffset          ErrCodes = 100
 )
 
 var ErrCodes_name = map[int32]string{
@@ -39,16 +41,20 @@ var ErrCodes_name = map[int32]string{
 	2:   "SpaceExists",
 	3:   "SpaceNotInCache",
 	4:   "SpaceIsDeleted",
+	5:   "PeerIsNotResponsible",
+	6:   "ReceiptIsInvalid",
 	100: "ErrorOffset",
 }
 
 var ErrCodes_value = map[string]int32{
-	"Unexpected":      0,
-	"SpaceMissing":    1,
-	"SpaceExists":     2,
-	"SpaceNotInCache": 3,
-	"SpaceIsDeleted":  4,
-	"ErrorOffset":     100,
+	"Unexpected":           0,
+	"SpaceMissing":         1,
+	"SpaceExists":          2,
+	"SpaceNotInCache":      3,
+	"SpaceIsDeleted":       4,
+	"PeerIsNotResponsible": 5,
+	"ReceiptIsInvalid":     6,
+	"ErrorOffset":          100,
 }
 
 func (x ErrCodes) String() string {
@@ -1248,73 +1254,75 @@ func init() {
 }
 
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+	0xdf, 0x96, 0xa7, 0xab, 0xfa, 0x6f, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xd3, 0x01, 0xff,
+	0xb5, 0x80, 0x0a, 0x00, 0x00,
 }
 
 func (m *HeadSyncRange) Marshal() (dAtA []byte, err error) {