diff --git a/go/chromite/api/payload.pb.go b/go/chromite/api/payload.pb.go
index 6c2aaa1..90a5aa1 100644
--- a/go/chromite/api/payload.pb.go
+++ b/go/chromite/api/payload.pb.go
@@ -494,7 +494,11 @@
 // Result of a payload generation.
 type GenerationResponse struct {
 	// Whether we've completed successfully.
-	Success              bool     `protobuf:"varint,1,opt,name=success,proto3" json:"success,omitempty"`
+	Success bool `protobuf:"varint,1,opt,name=success,proto3" json:"success,omitempty"`
+	// If successful we may have uploaded an artifact to google storage. This will
+	// have a random bit included, but is otherwise deterministic with the input
+	// properties. Return it so we can find the artifact.
+	UniqueId             string   `protobuf:"bytes,2,opt,name=unique_id,json=uniqueId,proto3" json:"unique_id,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -532,6 +536,13 @@
 	return false
 }
 
+func (m *GenerationResponse) GetUniqueId() string {
+	if m != nil {
+		return m.UniqueId
+	}
+	return ""
+}
+
 func init() {
 	proto.RegisterType((*Build)(nil), "chromite.api.Build")
 	proto.RegisterType((*DLCImage)(nil), "chromite.api.DLCImage")
@@ -544,48 +555,49 @@
 func init() { proto.RegisterFile("chromite/api/payload.proto", fileDescriptor_0ecdf1e4e8bef7a4) }
 
 var fileDescriptor_0ecdf1e4e8bef7a4 = []byte{
-	// 653 bytes of a gzipped FileDescriptorProto
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-	0x0c, 0xcd, 0x1d, 0x47, 0xcd, 0x87, 0x1d, 0x79, 0xd8, 0xdc, 0x7f, 0xcf, 0x91, 0x21, 0x5b, 0x38,
-	0xf2, 0xff, 0xea, 0xc8, 0xc3, 0xbe, 0x4e, 0xf4, 0xad, 0xa3, 0xc5, 0x7b, 0x6d, 0xd5, 0xde, 0xeb,
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-	0x00, 0x00, 0x00, 0xff, 0xff, 0x9a, 0x08, 0x96, 0xa2, 0xe2, 0x05, 0x00, 0x00,
+	// 668 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xbc, 0x54, 0xc1, 0x4e, 0xdb, 0x4a,
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+	0xc3, 0xa1, 0xdd, 0xc2, 0xc3, 0x58, 0x0c, 0xab, 0xeb, 0x7b, 0xd2, 0xb2, 0xf0, 0xb3, 0x9f, 0x01,
+	0x00, 0x00, 0xff, 0xff, 0x0b, 0x26, 0x81, 0x9e, 0xff, 0x05, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/src/chromite/api/payload.proto b/src/chromite/api/payload.proto
index c3eff7d..1d0bd08 100644
--- a/src/chromite/api/payload.proto
+++ b/src/chromite/api/payload.proto
@@ -106,6 +106,11 @@
 message GenerationResponse {
   // Whether we've completed successfully.
   bool success = 1;
+
+  // If successful we may have uploaded an artifact to google storage. This will
+  // have a random bit included, but is otherwise deterministic with the input
+  // properties. Return it so we can find the artifact.
+  string unique_id = 2;
 }
 
 // The image service definition.