diff --git a/go/generate.go b/go/generate.go
index 4b538070..a4d4aadb 100644
--- a/go/generate.go
+++ b/go/generate.go
@@ -17,6 +17,7 @@ import (
 //go:generate compile ../proto/keystore_api/v1/keystore.proto
 //go:generate compile ../proto/message_api/v1/message_api.proto
 //go:generate compile ../proto/message_api/v3/mls.proto
+//go:generate compile ../proto/mls_validation/v1/service.proto
 //go:generate compile ../proto/mls/message_contents/message.proto
 //go:generate compile ../proto/message_api/v1/authn.proto
 //go:generate compile ../proto/message_contents/content.proto
diff --git a/go/keystore_api/v1/keystore.pb.go b/go/keystore_api/v1/keystore.pb.go
index 67c45322..7d92dc82 100644
--- a/go/keystore_api/v1/keystore.pb.go
+++ b/go/keystore_api/v1/keystore.pb.go
@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
-// 	protoc        v4.23.3
+// 	protoc        v3.21.12
 // source: keystore_api/v1/keystore.proto
 
 package v1
@@ -1217,7 +1217,6 @@ type InitKeystoreRequest struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to Bundle:
-	//
 	//	*InitKeystoreRequest_V1
 	Bundle isInitKeystoreRequest_Bundle `protobuf_oneof:"bundle"`
 }
@@ -1335,7 +1334,6 @@ type SignDigestRequest struct {
 
 	Digest []byte `protobuf:"bytes,1,opt,name=digest,proto3" json:"digest,omitempty"`
 	// Types that are assignable to Signer:
-	//
 	//	*SignDigestRequest_IdentityKey
 	//	*SignDigestRequest_PrekeyIndex
 	Signer isSignDigestRequest_Signer `protobuf_oneof:"signer"`
@@ -1735,7 +1733,6 @@ type DecryptResponse_Response struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to Response:
-	//
 	//	*DecryptResponse_Response_Result
 	//	*DecryptResponse_Response_Error
 	Response isDecryptResponse_Response_Response `protobuf_oneof:"response"`
@@ -1993,7 +1990,6 @@ type EncryptResponse_Response struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to Response:
-	//
 	//	*EncryptResponse_Response_Result
 	//	*EncryptResponse_Response_Error
 	Response isEncryptResponse_Response_Response `protobuf_oneof:"response"`
@@ -2235,7 +2231,6 @@ type SelfEncryptResponse_Response struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to Response:
-	//
 	//	*SelfEncryptResponse_Response_Result
 	//	*SelfEncryptResponse_Response_Error
 	Response isSelfEncryptResponse_Response_Response `protobuf_oneof:"response"`
@@ -2477,7 +2472,6 @@ type SaveInvitesResponse_Response struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to Response:
-	//
 	//	*SaveInvitesResponse_Response_Result
 	//	*SaveInvitesResponse_Response_Error
 	Response isSaveInvitesResponse_Response_Response `protobuf_oneof:"response"`
diff --git a/go/message_api/v1/authn.pb.go b/go/message_api/v1/authn.pb.go
index dfe2fe55..2f86aaab 100644
--- a/go/message_api/v1/authn.pb.go
+++ b/go/message_api/v1/authn.pb.go
@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
-// 	protoc        v4.23.3
+// 	protoc        v3.21.12
 // source: message_api/v1/authn.proto
 
 package v1
diff --git a/go/message_api/v1/message_api.pb.go b/go/message_api/v1/message_api.pb.go
index dd46ff38..b5dd61fc 100644
--- a/go/message_api/v1/message_api.pb.go
+++ b/go/message_api/v1/message_api.pb.go
@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
-// 	protoc        v4.23.3
+// 	protoc        v3.21.12
 // source: message_api/v1/message_api.proto
 
 package v1
@@ -143,7 +143,6 @@ type Cursor struct {
 	// This way we can handle both methods
 	//
 	// Types that are assignable to Cursor:
-	//
 	//	*Cursor_Index
 	Cursor isCursor_Cursor `protobuf_oneof:"cursor"`
 }
diff --git a/go/message_api/v1/message_api_grpc.pb.go b/go/message_api/v1/message_api_grpc.pb.go
index a8e51579..f2453d62 100644
--- a/go/message_api/v1/message_api_grpc.pb.go
+++ b/go/message_api/v1/message_api_grpc.pb.go
@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
 // - protoc-gen-go-grpc v1.3.0
-// - protoc             v4.23.3
+// - protoc             v3.21.12
 // source: message_api/v1/message_api.proto
 
 package v1
diff --git a/go/message_api/v3/mls.pb.go b/go/message_api/v3/mls.pb.go
index 75ed7c85..6d4e92dd 100644
--- a/go/message_api/v3/mls.pb.go
+++ b/go/message_api/v3/mls.pb.go
@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
-// 	protoc        v4.23.3
+// 	protoc        v3.21.12
 // source: message_api/v3/mls.proto
 
 package v3
@@ -123,20 +123,70 @@ func (x *PublishWelcomesRequest) GetWelcomeMessages() []*PublishWelcomesRequest_
 	return nil
 }
 
+// A wrapper around the Key Package bytes
+type KeyPackageUpload struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The owner's wallet address would be extracted from the identity
+	// credential in the key package, and all signatures would be validated.
+	KeyPackageTlsSerialized []byte `protobuf:"bytes,1,opt,name=key_package_tls_serialized,json=keyPackageTlsSerialized,proto3" json:"key_package_tls_serialized,omitempty"`
+}
+
+func (x *KeyPackageUpload) Reset() {
+	*x = KeyPackageUpload{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_message_api_v3_mls_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *KeyPackageUpload) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*KeyPackageUpload) ProtoMessage() {}
+
+func (x *KeyPackageUpload) ProtoReflect() protoreflect.Message {
+	mi := &file_message_api_v3_mls_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use KeyPackageUpload.ProtoReflect.Descriptor instead.
+func (*KeyPackageUpload) Descriptor() ([]byte, []int) {
+	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *KeyPackageUpload) GetKeyPackageTlsSerialized() []byte {
+	if x != nil {
+		return x.KeyPackageTlsSerialized
+	}
+	return nil
+}
+
 // Register a new installation
 type RegisterInstallationRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	CredentialBytes  []byte `protobuf:"bytes,1,opt,name=credential_bytes,json=credentialBytes,proto3" json:"credential_bytes,omitempty"`
-	SigningKeyPublic []byte `protobuf:"bytes,2,opt,name=signing_key_public,json=signingKeyPublic,proto3" json:"signing_key_public,omitempty"`
+	// The Key Package contains all information needed to register an installation
+	LastResortKeyPackage *KeyPackageUpload `protobuf:"bytes,1,opt,name=last_resort_key_package,json=lastResortKeyPackage,proto3" json:"last_resort_key_package,omitempty"`
 }
 
 func (x *RegisterInstallationRequest) Reset() {
 	*x = RegisterInstallationRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_message_api_v3_mls_proto_msgTypes[2]
+		mi := &file_message_api_v3_mls_proto_msgTypes[3]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -149,7 +199,7 @@ func (x *RegisterInstallationRequest) String() string {
 func (*RegisterInstallationRequest) ProtoMessage() {}
 
 func (x *RegisterInstallationRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_message_api_v3_mls_proto_msgTypes[2]
+	mi := &file_message_api_v3_mls_proto_msgTypes[3]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -162,35 +212,29 @@ func (x *RegisterInstallationRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use RegisterInstallationRequest.ProtoReflect.Descriptor instead.
 func (*RegisterInstallationRequest) Descriptor() ([]byte, []int) {
-	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{2}
-}
-
-func (x *RegisterInstallationRequest) GetCredentialBytes() []byte {
-	if x != nil {
-		return x.CredentialBytes
-	}
-	return nil
+	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{3}
 }
 
-func (x *RegisterInstallationRequest) GetSigningKeyPublic() []byte {
+func (x *RegisterInstallationRequest) GetLastResortKeyPackage() *KeyPackageUpload {
 	if x != nil {
-		return x.SigningKeyPublic
+		return x.LastResortKeyPackage
 	}
 	return nil
 }
 
+// The response to a RegisterInstallationRequest
 type RegisterInstallationResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	InstallationId string `protobuf:"bytes,1,opt,name=installation_id,json=installationId,proto3" json:"installation_id,omitempty"`
+	InstallationId []byte `protobuf:"bytes,1,opt,name=installation_id,json=installationId,proto3" json:"installation_id,omitempty"`
 }
 
 func (x *RegisterInstallationResponse) Reset() {
 	*x = RegisterInstallationResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_message_api_v3_mls_proto_msgTypes[3]
+		mi := &file_message_api_v3_mls_proto_msgTypes[4]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -203,7 +247,7 @@ func (x *RegisterInstallationResponse) String() string {
 func (*RegisterInstallationResponse) ProtoMessage() {}
 
 func (x *RegisterInstallationResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_message_api_v3_mls_proto_msgTypes[3]
+	mi := &file_message_api_v3_mls_proto_msgTypes[4]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -216,14 +260,14 @@ func (x *RegisterInstallationResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use RegisterInstallationResponse.ProtoReflect.Descriptor instead.
 func (*RegisterInstallationResponse) Descriptor() ([]byte, []int) {
-	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{3}
+	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{4}
 }
 
-func (x *RegisterInstallationResponse) GetInstallationId() string {
+func (x *RegisterInstallationResponse) GetInstallationId() []byte {
 	if x != nil {
 		return x.InstallationId
 	}
-	return ""
+	return nil
 }
 
 // Upload one or more key packages
@@ -232,13 +276,14 @@ type UploadKeyPackagesRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	KeyPackages []*UploadKeyPackagesRequest_KeyPackageUpload `protobuf:"bytes,1,rep,name=key_packages,json=keyPackages,proto3" json:"key_packages,omitempty"`
+	// An individual key package upload request
+	KeyPackages []*KeyPackageUpload `protobuf:"bytes,1,rep,name=key_packages,json=keyPackages,proto3" json:"key_packages,omitempty"`
 }
 
 func (x *UploadKeyPackagesRequest) Reset() {
 	*x = UploadKeyPackagesRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_message_api_v3_mls_proto_msgTypes[4]
+		mi := &file_message_api_v3_mls_proto_msgTypes[5]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -251,7 +296,7 @@ func (x *UploadKeyPackagesRequest) String() string {
 func (*UploadKeyPackagesRequest) ProtoMessage() {}
 
 func (x *UploadKeyPackagesRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_message_api_v3_mls_proto_msgTypes[4]
+	mi := &file_message_api_v3_mls_proto_msgTypes[5]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -264,10 +309,10 @@ func (x *UploadKeyPackagesRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use UploadKeyPackagesRequest.ProtoReflect.Descriptor instead.
 func (*UploadKeyPackagesRequest) Descriptor() ([]byte, []int) {
-	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{4}
+	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{5}
 }
 
-func (x *UploadKeyPackagesRequest) GetKeyPackages() []*UploadKeyPackagesRequest_KeyPackageUpload {
+func (x *UploadKeyPackagesRequest) GetKeyPackages() []*KeyPackageUpload {
 	if x != nil {
 		return x.KeyPackages
 	}
@@ -283,13 +328,13 @@ type ConsumeKeyPackagesRequest struct {
 	// The caller can provide an array of wallet addresses, and the API
 	// will return one key package for each installation associated with each
 	// wallet address
-	InstallationIds []string `protobuf:"bytes,1,rep,name=installation_ids,json=installationIds,proto3" json:"installation_ids,omitempty"`
+	InstallationIds [][]byte `protobuf:"bytes,1,rep,name=installation_ids,json=installationIds,proto3" json:"installation_ids,omitempty"`
 }
 
 func (x *ConsumeKeyPackagesRequest) Reset() {
 	*x = ConsumeKeyPackagesRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_message_api_v3_mls_proto_msgTypes[5]
+		mi := &file_message_api_v3_mls_proto_msgTypes[6]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -302,7 +347,7 @@ func (x *ConsumeKeyPackagesRequest) String() string {
 func (*ConsumeKeyPackagesRequest) ProtoMessage() {}
 
 func (x *ConsumeKeyPackagesRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_message_api_v3_mls_proto_msgTypes[5]
+	mi := &file_message_api_v3_mls_proto_msgTypes[6]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -315,10 +360,10 @@ func (x *ConsumeKeyPackagesRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ConsumeKeyPackagesRequest.ProtoReflect.Descriptor instead.
 func (*ConsumeKeyPackagesRequest) Descriptor() ([]byte, []int) {
-	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{5}
+	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{6}
 }
 
-func (x *ConsumeKeyPackagesRequest) GetInstallationIds() []string {
+func (x *ConsumeKeyPackagesRequest) GetInstallationIds() [][]byte {
 	if x != nil {
 		return x.InstallationIds
 	}
@@ -339,7 +384,7 @@ type ConsumeKeyPackagesResponse struct {
 func (x *ConsumeKeyPackagesResponse) Reset() {
 	*x = ConsumeKeyPackagesResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_message_api_v3_mls_proto_msgTypes[6]
+		mi := &file_message_api_v3_mls_proto_msgTypes[7]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -352,7 +397,7 @@ func (x *ConsumeKeyPackagesResponse) String() string {
 func (*ConsumeKeyPackagesResponse) ProtoMessage() {}
 
 func (x *ConsumeKeyPackagesResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_message_api_v3_mls_proto_msgTypes[6]
+	mi := &file_message_api_v3_mls_proto_msgTypes[7]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -365,7 +410,7 @@ func (x *ConsumeKeyPackagesResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ConsumeKeyPackagesResponse.ProtoReflect.Descriptor instead.
 func (*ConsumeKeyPackagesResponse) Descriptor() ([]byte, []int) {
-	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{6}
+	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{7}
 }
 
 func (x *ConsumeKeyPackagesResponse) GetKeyPackages() []*ConsumeKeyPackagesResponse_KeyPackage {
@@ -381,7 +426,7 @@ type RevokeInstallationRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	InstallationId string `protobuf:"bytes,1,opt,name=installation_id,json=installationId,proto3" json:"installation_id,omitempty"`
+	InstallationId []byte `protobuf:"bytes,1,opt,name=installation_id,json=installationId,proto3" json:"installation_id,omitempty"`
 	// All revocations must be validated with a wallet signature over the
 	// installation_id being revoked (and some sort of standard prologue)
 	WalletSignature *message_contents1.Signature `protobuf:"bytes,2,opt,name=wallet_signature,json=walletSignature,proto3" json:"wallet_signature,omitempty"`
@@ -390,7 +435,7 @@ type RevokeInstallationRequest struct {
 func (x *RevokeInstallationRequest) Reset() {
 	*x = RevokeInstallationRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_message_api_v3_mls_proto_msgTypes[7]
+		mi := &file_message_api_v3_mls_proto_msgTypes[8]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -403,7 +448,7 @@ func (x *RevokeInstallationRequest) String() string {
 func (*RevokeInstallationRequest) ProtoMessage() {}
 
 func (x *RevokeInstallationRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_message_api_v3_mls_proto_msgTypes[7]
+	mi := &file_message_api_v3_mls_proto_msgTypes[8]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -416,14 +461,14 @@ func (x *RevokeInstallationRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use RevokeInstallationRequest.ProtoReflect.Descriptor instead.
 func (*RevokeInstallationRequest) Descriptor() ([]byte, []int) {
-	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{7}
+	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{8}
 }
 
-func (x *RevokeInstallationRequest) GetInstallationId() string {
+func (x *RevokeInstallationRequest) GetInstallationId() []byte {
 	if x != nil {
 		return x.InstallationId
 	}
-	return ""
+	return nil
 }
 
 func (x *RevokeInstallationRequest) GetWalletSignature() *message_contents1.Signature {
@@ -446,7 +491,7 @@ type GetIdentityUpdatesRequest struct {
 func (x *GetIdentityUpdatesRequest) Reset() {
 	*x = GetIdentityUpdatesRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_message_api_v3_mls_proto_msgTypes[8]
+		mi := &file_message_api_v3_mls_proto_msgTypes[9]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -459,7 +504,7 @@ func (x *GetIdentityUpdatesRequest) String() string {
 func (*GetIdentityUpdatesRequest) ProtoMessage() {}
 
 func (x *GetIdentityUpdatesRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_message_api_v3_mls_proto_msgTypes[8]
+	mi := &file_message_api_v3_mls_proto_msgTypes[9]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -472,7 +517,7 @@ func (x *GetIdentityUpdatesRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetIdentityUpdatesRequest.ProtoReflect.Descriptor instead.
 func (*GetIdentityUpdatesRequest) Descriptor() ([]byte, []int) {
-	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{8}
+	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{9}
 }
 
 func (x *GetIdentityUpdatesRequest) GetWalletAddresses() []string {
@@ -503,7 +548,7 @@ type GetIdentityUpdatesResponse struct {
 func (x *GetIdentityUpdatesResponse) Reset() {
 	*x = GetIdentityUpdatesResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_message_api_v3_mls_proto_msgTypes[9]
+		mi := &file_message_api_v3_mls_proto_msgTypes[10]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -516,7 +561,7 @@ func (x *GetIdentityUpdatesResponse) String() string {
 func (*GetIdentityUpdatesResponse) ProtoMessage() {}
 
 func (x *GetIdentityUpdatesResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_message_api_v3_mls_proto_msgTypes[9]
+	mi := &file_message_api_v3_mls_proto_msgTypes[10]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -529,7 +574,7 @@ func (x *GetIdentityUpdatesResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetIdentityUpdatesResponse.ProtoReflect.Descriptor instead.
 func (*GetIdentityUpdatesResponse) Descriptor() ([]byte, []int) {
-	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{9}
+	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{10}
 }
 
 func (x *GetIdentityUpdatesResponse) GetUpdates() []*GetIdentityUpdatesResponse_WalletUpdates {
@@ -546,14 +591,14 @@ type PublishWelcomesRequest_WelcomeMessageRequest struct {
 	unknownFields protoimpl.UnknownFields
 
 	// The topic will be derived from this
-	InstallationId string                           `protobuf:"bytes,1,opt,name=installation_id,json=installationId,proto3" json:"installation_id,omitempty"`
+	InstallationId []byte                           `protobuf:"bytes,1,opt,name=installation_id,json=installationId,proto3" json:"installation_id,omitempty"`
 	WelcomeMessage *message_contents.WelcomeMessage `protobuf:"bytes,2,opt,name=welcome_message,json=welcomeMessage,proto3" json:"welcome_message,omitempty"`
 }
 
 func (x *PublishWelcomesRequest_WelcomeMessageRequest) Reset() {
 	*x = PublishWelcomesRequest_WelcomeMessageRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_message_api_v3_mls_proto_msgTypes[10]
+		mi := &file_message_api_v3_mls_proto_msgTypes[11]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -566,7 +611,7 @@ func (x *PublishWelcomesRequest_WelcomeMessageRequest) String() string {
 func (*PublishWelcomesRequest_WelcomeMessageRequest) ProtoMessage() {}
 
 func (x *PublishWelcomesRequest_WelcomeMessageRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_message_api_v3_mls_proto_msgTypes[10]
+	mi := &file_message_api_v3_mls_proto_msgTypes[11]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -582,11 +627,11 @@ func (*PublishWelcomesRequest_WelcomeMessageRequest) Descriptor() ([]byte, []int
 	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{1, 0}
 }
 
-func (x *PublishWelcomesRequest_WelcomeMessageRequest) GetInstallationId() string {
+func (x *PublishWelcomesRequest_WelcomeMessageRequest) GetInstallationId() []byte {
 	if x != nil {
 		return x.InstallationId
 	}
-	return ""
+	return nil
 }
 
 func (x *PublishWelcomesRequest_WelcomeMessageRequest) GetWelcomeMessage() *message_contents.WelcomeMessage {
@@ -596,66 +641,6 @@ func (x *PublishWelcomesRequest_WelcomeMessageRequest) GetWelcomeMessage() *mess
 	return nil
 }
 
-// An individual key package upload request
-type UploadKeyPackagesRequest_KeyPackageUpload struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// The owner's wallet address would be extracted from the identity
-	// credential in the key package, and all signatures would be validated.
-	KeyPackageTlsSerialized []byte `protobuf:"bytes,1,opt,name=key_package_tls_serialized,json=keyPackageTlsSerialized,proto3" json:"key_package_tls_serialized,omitempty"`
-	// The node will always treat the most recent last-resort key package as
-	// the active one, and will ignore all others.
-	IsLastResort bool `protobuf:"varint,2,opt,name=is_last_resort,json=isLastResort,proto3" json:"is_last_resort,omitempty"`
-}
-
-func (x *UploadKeyPackagesRequest_KeyPackageUpload) Reset() {
-	*x = UploadKeyPackagesRequest_KeyPackageUpload{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_message_api_v3_mls_proto_msgTypes[11]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *UploadKeyPackagesRequest_KeyPackageUpload) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*UploadKeyPackagesRequest_KeyPackageUpload) ProtoMessage() {}
-
-func (x *UploadKeyPackagesRequest_KeyPackageUpload) ProtoReflect() protoreflect.Message {
-	mi := &file_message_api_v3_mls_proto_msgTypes[11]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use UploadKeyPackagesRequest_KeyPackageUpload.ProtoReflect.Descriptor instead.
-func (*UploadKeyPackagesRequest_KeyPackageUpload) Descriptor() ([]byte, []int) {
-	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{4, 0}
-}
-
-func (x *UploadKeyPackagesRequest_KeyPackageUpload) GetKeyPackageTlsSerialized() []byte {
-	if x != nil {
-		return x.KeyPackageTlsSerialized
-	}
-	return nil
-}
-
-func (x *UploadKeyPackagesRequest_KeyPackageUpload) GetIsLastResort() bool {
-	if x != nil {
-		return x.IsLastResort
-	}
-	return false
-}
-
 // An individual key package
 type ConsumeKeyPackagesResponse_KeyPackage struct {
 	state         protoimpl.MessageState
@@ -694,7 +679,7 @@ func (x *ConsumeKeyPackagesResponse_KeyPackage) ProtoReflect() protoreflect.Mess
 
 // Deprecated: Use ConsumeKeyPackagesResponse_KeyPackage.ProtoReflect.Descriptor instead.
 func (*ConsumeKeyPackagesResponse_KeyPackage) Descriptor() ([]byte, []int) {
-	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{6, 0}
+	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{7, 0}
 }
 
 func (x *ConsumeKeyPackagesResponse_KeyPackage) GetKeyPackageTlsSerialized() []byte {
@@ -710,7 +695,8 @@ type GetIdentityUpdatesResponse_NewInstallationUpdate struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	InstallationId string `protobuf:"bytes,1,opt,name=installation_id,json=installationId,proto3" json:"installation_id,omitempty"`
+	InstallationId     []byte `protobuf:"bytes,1,opt,name=installation_id,json=installationId,proto3" json:"installation_id,omitempty"`
+	CredentialIdentity []byte `protobuf:"bytes,2,opt,name=credential_identity,json=credentialIdentity,proto3" json:"credential_identity,omitempty"`
 }
 
 func (x *GetIdentityUpdatesResponse_NewInstallationUpdate) Reset() {
@@ -742,14 +728,21 @@ func (x *GetIdentityUpdatesResponse_NewInstallationUpdate) ProtoReflect() protor
 
 // Deprecated: Use GetIdentityUpdatesResponse_NewInstallationUpdate.ProtoReflect.Descriptor instead.
 func (*GetIdentityUpdatesResponse_NewInstallationUpdate) Descriptor() ([]byte, []int) {
-	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{9, 0}
+	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{10, 0}
 }
 
-func (x *GetIdentityUpdatesResponse_NewInstallationUpdate) GetInstallationId() string {
+func (x *GetIdentityUpdatesResponse_NewInstallationUpdate) GetInstallationId() []byte {
 	if x != nil {
 		return x.InstallationId
 	}
-	return ""
+	return nil
+}
+
+func (x *GetIdentityUpdatesResponse_NewInstallationUpdate) GetCredentialIdentity() []byte {
+	if x != nil {
+		return x.CredentialIdentity
+	}
+	return nil
 }
 
 // An installation was revoked
@@ -758,7 +751,7 @@ type GetIdentityUpdatesResponse_RevokedInstallationUpdate struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	InstallationId string `protobuf:"bytes,1,opt,name=installation_id,json=installationId,proto3" json:"installation_id,omitempty"`
+	InstallationId []byte `protobuf:"bytes,1,opt,name=installation_id,json=installationId,proto3" json:"installation_id,omitempty"`
 }
 
 func (x *GetIdentityUpdatesResponse_RevokedInstallationUpdate) Reset() {
@@ -790,14 +783,14 @@ func (x *GetIdentityUpdatesResponse_RevokedInstallationUpdate) ProtoReflect() pr
 
 // Deprecated: Use GetIdentityUpdatesResponse_RevokedInstallationUpdate.ProtoReflect.Descriptor instead.
 func (*GetIdentityUpdatesResponse_RevokedInstallationUpdate) Descriptor() ([]byte, []int) {
-	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{9, 1}
+	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{10, 1}
 }
 
-func (x *GetIdentityUpdatesResponse_RevokedInstallationUpdate) GetInstallationId() string {
+func (x *GetIdentityUpdatesResponse_RevokedInstallationUpdate) GetInstallationId() []byte {
 	if x != nil {
 		return x.InstallationId
 	}
-	return ""
+	return nil
 }
 
 // A wrapper for any update to the wallet
@@ -808,7 +801,6 @@ type GetIdentityUpdatesResponse_Update struct {
 
 	TimestampNs uint64 `protobuf:"varint,1,opt,name=timestamp_ns,json=timestampNs,proto3" json:"timestamp_ns,omitempty"`
 	// Types that are assignable to Kind:
-	//
 	//	*GetIdentityUpdatesResponse_Update_NewInstallation
 	//	*GetIdentityUpdatesResponse_Update_RevokedInstallation
 	Kind isGetIdentityUpdatesResponse_Update_Kind `protobuf_oneof:"kind"`
@@ -843,7 +835,7 @@ func (x *GetIdentityUpdatesResponse_Update) ProtoReflect() protoreflect.Message
 
 // Deprecated: Use GetIdentityUpdatesResponse_Update.ProtoReflect.Descriptor instead.
 func (*GetIdentityUpdatesResponse_Update) Descriptor() ([]byte, []int) {
-	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{9, 2}
+	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{10, 2}
 }
 
 func (x *GetIdentityUpdatesResponse_Update) GetTimestampNs() uint64 {
@@ -930,7 +922,7 @@ func (x *GetIdentityUpdatesResponse_WalletUpdates) ProtoReflect() protoreflect.M
 
 // Deprecated: Use GetIdentityUpdatesResponse_WalletUpdates.ProtoReflect.Descriptor instead.
 func (*GetIdentityUpdatesResponse_WalletUpdates) Descriptor() ([]byte, []int) {
-	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{9, 3}
+	return file_message_api_v3_mls_proto_rawDescGZIP(), []int{10, 3}
 }
 
 func (x *GetIdentityUpdatesResponse_WalletUpdates) GetUpdates() []*GetIdentityUpdatesResponse_Update {
@@ -974,186 +966,186 @@ var file_message_api_v3_mls_proto_rawDesc = []byte{
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 }
 
 var (
@@ -1172,16 +1164,16 @@ var file_message_api_v3_mls_proto_msgTypes = make([]protoimpl.MessageInfo, 17)
 var file_message_api_v3_mls_proto_goTypes = []interface{}{
 	(*PublishToGroupRequest)(nil),                                // 0: xmtp.message_api.v3.PublishToGroupRequest
 	(*PublishWelcomesRequest)(nil),                               // 1: xmtp.message_api.v3.PublishWelcomesRequest
-	(*RegisterInstallationRequest)(nil),                          // 2: xmtp.message_api.v3.RegisterInstallationRequest
-	(*RegisterInstallationResponse)(nil),                         // 3: xmtp.message_api.v3.RegisterInstallationResponse
-	(*UploadKeyPackagesRequest)(nil),                             // 4: xmtp.message_api.v3.UploadKeyPackagesRequest
-	(*ConsumeKeyPackagesRequest)(nil),                            // 5: xmtp.message_api.v3.ConsumeKeyPackagesRequest
-	(*ConsumeKeyPackagesResponse)(nil),                           // 6: xmtp.message_api.v3.ConsumeKeyPackagesResponse
-	(*RevokeInstallationRequest)(nil),                            // 7: xmtp.message_api.v3.RevokeInstallationRequest
-	(*GetIdentityUpdatesRequest)(nil),                            // 8: xmtp.message_api.v3.GetIdentityUpdatesRequest
-	(*GetIdentityUpdatesResponse)(nil),                           // 9: xmtp.message_api.v3.GetIdentityUpdatesResponse
-	(*PublishWelcomesRequest_WelcomeMessageRequest)(nil),         // 10: xmtp.message_api.v3.PublishWelcomesRequest.WelcomeMessageRequest
-	(*UploadKeyPackagesRequest_KeyPackageUpload)(nil),            // 11: xmtp.message_api.v3.UploadKeyPackagesRequest.KeyPackageUpload
+	(*KeyPackageUpload)(nil),                                     // 2: xmtp.message_api.v3.KeyPackageUpload
+	(*RegisterInstallationRequest)(nil),                          // 3: xmtp.message_api.v3.RegisterInstallationRequest
+	(*RegisterInstallationResponse)(nil),                         // 4: xmtp.message_api.v3.RegisterInstallationResponse
+	(*UploadKeyPackagesRequest)(nil),                             // 5: xmtp.message_api.v3.UploadKeyPackagesRequest
+	(*ConsumeKeyPackagesRequest)(nil),                            // 6: xmtp.message_api.v3.ConsumeKeyPackagesRequest
+	(*ConsumeKeyPackagesResponse)(nil),                           // 7: xmtp.message_api.v3.ConsumeKeyPackagesResponse
+	(*RevokeInstallationRequest)(nil),                            // 8: xmtp.message_api.v3.RevokeInstallationRequest
+	(*GetIdentityUpdatesRequest)(nil),                            // 9: xmtp.message_api.v3.GetIdentityUpdatesRequest
+	(*GetIdentityUpdatesResponse)(nil),                           // 10: xmtp.message_api.v3.GetIdentityUpdatesResponse
+	(*PublishWelcomesRequest_WelcomeMessageRequest)(nil),         // 11: xmtp.message_api.v3.PublishWelcomesRequest.WelcomeMessageRequest
 	(*ConsumeKeyPackagesResponse_KeyPackage)(nil),                // 12: xmtp.message_api.v3.ConsumeKeyPackagesResponse.KeyPackage
 	(*GetIdentityUpdatesResponse_NewInstallationUpdate)(nil),     // 13: xmtp.message_api.v3.GetIdentityUpdatesResponse.NewInstallationUpdate
 	(*GetIdentityUpdatesResponse_RevokedInstallationUpdate)(nil), // 14: xmtp.message_api.v3.GetIdentityUpdatesResponse.RevokedInstallationUpdate
@@ -1194,34 +1186,35 @@ var file_message_api_v3_mls_proto_goTypes = []interface{}{
 }
 var file_message_api_v3_mls_proto_depIdxs = []int32{
 	17, // 0: xmtp.message_api.v3.PublishToGroupRequest.messages:type_name -> xmtp.mls.message_contents.GroupMessage
-	10, // 1: xmtp.message_api.v3.PublishWelcomesRequest.welcome_messages:type_name -> xmtp.message_api.v3.PublishWelcomesRequest.WelcomeMessageRequest
-	11, // 2: xmtp.message_api.v3.UploadKeyPackagesRequest.key_packages:type_name -> xmtp.message_api.v3.UploadKeyPackagesRequest.KeyPackageUpload
-	12, // 3: xmtp.message_api.v3.ConsumeKeyPackagesResponse.key_packages:type_name -> xmtp.message_api.v3.ConsumeKeyPackagesResponse.KeyPackage
-	18, // 4: xmtp.message_api.v3.RevokeInstallationRequest.wallet_signature:type_name -> xmtp.message_contents.Signature
-	16, // 5: xmtp.message_api.v3.GetIdentityUpdatesResponse.updates:type_name -> xmtp.message_api.v3.GetIdentityUpdatesResponse.WalletUpdates
-	19, // 6: xmtp.message_api.v3.PublishWelcomesRequest.WelcomeMessageRequest.welcome_message:type_name -> xmtp.mls.message_contents.WelcomeMessage
-	13, // 7: xmtp.message_api.v3.GetIdentityUpdatesResponse.Update.new_installation:type_name -> xmtp.message_api.v3.GetIdentityUpdatesResponse.NewInstallationUpdate
-	14, // 8: xmtp.message_api.v3.GetIdentityUpdatesResponse.Update.revoked_installation:type_name -> xmtp.message_api.v3.GetIdentityUpdatesResponse.RevokedInstallationUpdate
-	15, // 9: xmtp.message_api.v3.GetIdentityUpdatesResponse.WalletUpdates.updates:type_name -> xmtp.message_api.v3.GetIdentityUpdatesResponse.Update
-	0,  // 10: xmtp.message_api.v3.MlsApi.PublishToGroup:input_type -> xmtp.message_api.v3.PublishToGroupRequest
-	1,  // 11: xmtp.message_api.v3.MlsApi.PublishWelcomes:input_type -> xmtp.message_api.v3.PublishWelcomesRequest
-	2,  // 12: xmtp.message_api.v3.MlsApi.RegisterInstallation:input_type -> xmtp.message_api.v3.RegisterInstallationRequest
-	4,  // 13: xmtp.message_api.v3.MlsApi.UploadKeyPackages:input_type -> xmtp.message_api.v3.UploadKeyPackagesRequest
-	5,  // 14: xmtp.message_api.v3.MlsApi.ConsumeKeyPackages:input_type -> xmtp.message_api.v3.ConsumeKeyPackagesRequest
-	7,  // 15: xmtp.message_api.v3.MlsApi.RevokeInstallation:input_type -> xmtp.message_api.v3.RevokeInstallationRequest
-	8,  // 16: xmtp.message_api.v3.MlsApi.GetIdentityUpdates:input_type -> xmtp.message_api.v3.GetIdentityUpdatesRequest
-	20, // 17: xmtp.message_api.v3.MlsApi.PublishToGroup:output_type -> google.protobuf.Empty
-	20, // 18: xmtp.message_api.v3.MlsApi.PublishWelcomes:output_type -> google.protobuf.Empty
-	3,  // 19: xmtp.message_api.v3.MlsApi.RegisterInstallation:output_type -> xmtp.message_api.v3.RegisterInstallationResponse
-	20, // 20: xmtp.message_api.v3.MlsApi.UploadKeyPackages:output_type -> google.protobuf.Empty
-	6,  // 21: xmtp.message_api.v3.MlsApi.ConsumeKeyPackages:output_type -> xmtp.message_api.v3.ConsumeKeyPackagesResponse
-	20, // 22: xmtp.message_api.v3.MlsApi.RevokeInstallation:output_type -> google.protobuf.Empty
-	9,  // 23: xmtp.message_api.v3.MlsApi.GetIdentityUpdates:output_type -> xmtp.message_api.v3.GetIdentityUpdatesResponse
-	17, // [17:24] is the sub-list for method output_type
-	10, // [10:17] is the sub-list for method input_type
-	10, // [10:10] is the sub-list for extension type_name
-	10, // [10:10] is the sub-list for extension extendee
-	0,  // [0:10] is the sub-list for field type_name
+	11, // 1: xmtp.message_api.v3.PublishWelcomesRequest.welcome_messages:type_name -> xmtp.message_api.v3.PublishWelcomesRequest.WelcomeMessageRequest
+	2,  // 2: xmtp.message_api.v3.RegisterInstallationRequest.last_resort_key_package:type_name -> xmtp.message_api.v3.KeyPackageUpload
+	2,  // 3: xmtp.message_api.v3.UploadKeyPackagesRequest.key_packages:type_name -> xmtp.message_api.v3.KeyPackageUpload
+	12, // 4: xmtp.message_api.v3.ConsumeKeyPackagesResponse.key_packages:type_name -> xmtp.message_api.v3.ConsumeKeyPackagesResponse.KeyPackage
+	18, // 5: xmtp.message_api.v3.RevokeInstallationRequest.wallet_signature:type_name -> xmtp.message_contents.Signature
+	16, // 6: xmtp.message_api.v3.GetIdentityUpdatesResponse.updates:type_name -> xmtp.message_api.v3.GetIdentityUpdatesResponse.WalletUpdates
+	19, // 7: xmtp.message_api.v3.PublishWelcomesRequest.WelcomeMessageRequest.welcome_message:type_name -> xmtp.mls.message_contents.WelcomeMessage
+	13, // 8: xmtp.message_api.v3.GetIdentityUpdatesResponse.Update.new_installation:type_name -> xmtp.message_api.v3.GetIdentityUpdatesResponse.NewInstallationUpdate
+	14, // 9: xmtp.message_api.v3.GetIdentityUpdatesResponse.Update.revoked_installation:type_name -> xmtp.message_api.v3.GetIdentityUpdatesResponse.RevokedInstallationUpdate
+	15, // 10: xmtp.message_api.v3.GetIdentityUpdatesResponse.WalletUpdates.updates:type_name -> xmtp.message_api.v3.GetIdentityUpdatesResponse.Update
+	0,  // 11: xmtp.message_api.v3.MlsApi.PublishToGroup:input_type -> xmtp.message_api.v3.PublishToGroupRequest
+	1,  // 12: xmtp.message_api.v3.MlsApi.PublishWelcomes:input_type -> xmtp.message_api.v3.PublishWelcomesRequest
+	3,  // 13: xmtp.message_api.v3.MlsApi.RegisterInstallation:input_type -> xmtp.message_api.v3.RegisterInstallationRequest
+	5,  // 14: xmtp.message_api.v3.MlsApi.UploadKeyPackages:input_type -> xmtp.message_api.v3.UploadKeyPackagesRequest
+	6,  // 15: xmtp.message_api.v3.MlsApi.ConsumeKeyPackages:input_type -> xmtp.message_api.v3.ConsumeKeyPackagesRequest
+	8,  // 16: xmtp.message_api.v3.MlsApi.RevokeInstallation:input_type -> xmtp.message_api.v3.RevokeInstallationRequest
+	9,  // 17: xmtp.message_api.v3.MlsApi.GetIdentityUpdates:input_type -> xmtp.message_api.v3.GetIdentityUpdatesRequest
+	20, // 18: xmtp.message_api.v3.MlsApi.PublishToGroup:output_type -> google.protobuf.Empty
+	20, // 19: xmtp.message_api.v3.MlsApi.PublishWelcomes:output_type -> google.protobuf.Empty
+	4,  // 20: xmtp.message_api.v3.MlsApi.RegisterInstallation:output_type -> xmtp.message_api.v3.RegisterInstallationResponse
+	20, // 21: xmtp.message_api.v3.MlsApi.UploadKeyPackages:output_type -> google.protobuf.Empty
+	7,  // 22: xmtp.message_api.v3.MlsApi.ConsumeKeyPackages:output_type -> xmtp.message_api.v3.ConsumeKeyPackagesResponse
+	20, // 23: xmtp.message_api.v3.MlsApi.RevokeInstallation:output_type -> google.protobuf.Empty
+	10, // 24: xmtp.message_api.v3.MlsApi.GetIdentityUpdates:output_type -> xmtp.message_api.v3.GetIdentityUpdatesResponse
+	18, // [18:25] is the sub-list for method output_type
+	11, // [11:18] is the sub-list for method input_type
+	11, // [11:11] is the sub-list for extension type_name
+	11, // [11:11] is the sub-list for extension extendee
+	0,  // [0:11] is the sub-list for field type_name
 }
 
 func init() { file_message_api_v3_mls_proto_init() }
@@ -1255,7 +1248,7 @@ func file_message_api_v3_mls_proto_init() {
 			}
 		}
 		file_message_api_v3_mls_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RegisterInstallationRequest); i {
+			switch v := v.(*KeyPackageUpload); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1267,7 +1260,7 @@ func file_message_api_v3_mls_proto_init() {
 			}
 		}
 		file_message_api_v3_mls_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RegisterInstallationResponse); i {
+			switch v := v.(*RegisterInstallationRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1279,7 +1272,7 @@ func file_message_api_v3_mls_proto_init() {
 			}
 		}
 		file_message_api_v3_mls_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*UploadKeyPackagesRequest); i {
+			switch v := v.(*RegisterInstallationResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1291,7 +1284,7 @@ func file_message_api_v3_mls_proto_init() {
 			}
 		}
 		file_message_api_v3_mls_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ConsumeKeyPackagesRequest); i {
+			switch v := v.(*UploadKeyPackagesRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1303,7 +1296,7 @@ func file_message_api_v3_mls_proto_init() {
 			}
 		}
 		file_message_api_v3_mls_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ConsumeKeyPackagesResponse); i {
+			switch v := v.(*ConsumeKeyPackagesRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1315,7 +1308,7 @@ func file_message_api_v3_mls_proto_init() {
 			}
 		}
 		file_message_api_v3_mls_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RevokeInstallationRequest); i {
+			switch v := v.(*ConsumeKeyPackagesResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1327,7 +1320,7 @@ func file_message_api_v3_mls_proto_init() {
 			}
 		}
 		file_message_api_v3_mls_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetIdentityUpdatesRequest); i {
+			switch v := v.(*RevokeInstallationRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1339,7 +1332,7 @@ func file_message_api_v3_mls_proto_init() {
 			}
 		}
 		file_message_api_v3_mls_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetIdentityUpdatesResponse); i {
+			switch v := v.(*GetIdentityUpdatesRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1351,7 +1344,7 @@ func file_message_api_v3_mls_proto_init() {
 			}
 		}
 		file_message_api_v3_mls_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*PublishWelcomesRequest_WelcomeMessageRequest); i {
+			switch v := v.(*GetIdentityUpdatesResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1363,7 +1356,7 @@ func file_message_api_v3_mls_proto_init() {
 			}
 		}
 		file_message_api_v3_mls_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*UploadKeyPackagesRequest_KeyPackageUpload); i {
+			switch v := v.(*PublishWelcomesRequest_WelcomeMessageRequest); i {
 			case 0:
 				return &v.state
 			case 1:
diff --git a/go/message_api/v3/mls_grpc.pb.go b/go/message_api/v3/mls_grpc.pb.go
index 293625c9..4c23f06f 100644
--- a/go/message_api/v3/mls_grpc.pb.go
+++ b/go/message_api/v3/mls_grpc.pb.go
@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
 // - protoc-gen-go-grpc v1.3.0
-// - protoc             v4.23.3
+// - protoc             v3.21.12
 // source: message_api/v3/mls.proto
 
 package v3
diff --git a/go/message_contents/ciphertext.pb.go b/go/message_contents/ciphertext.pb.go
index d0a56673..9faff46c 100644
--- a/go/message_contents/ciphertext.pb.go
+++ b/go/message_contents/ciphertext.pb.go
@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
-// 	protoc        v4.23.3
+// 	protoc        v3.21.12
 // source: message_contents/ciphertext.proto
 
 package message_contents
@@ -32,7 +32,6 @@ type Ciphertext struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to Union:
-	//
 	//	*Ciphertext_Aes256GcmHkdfSha256
 	Union isCiphertext_Union `protobuf_oneof:"union"`
 }
diff --git a/go/message_contents/composite.pb.go b/go/message_contents/composite.pb.go
index 9c52b88a..4e76d57c 100644
--- a/go/message_contents/composite.pb.go
+++ b/go/message_contents/composite.pb.go
@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
-// 	protoc        v4.23.3
+// 	protoc        v3.21.12
 // source: message_contents/composite.proto
 
 package message_contents
@@ -77,7 +77,6 @@ type Composite_Part struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to Element:
-	//
 	//	*Composite_Part_Part
 	//	*Composite_Part_Composite
 	Element isComposite_Part_Element `protobuf_oneof:"element"`
diff --git a/go/message_contents/contact.pb.go b/go/message_contents/contact.pb.go
index 7b9df860..2b363d71 100644
--- a/go/message_contents/contact.pb.go
+++ b/go/message_contents/contact.pb.go
@@ -7,7 +7,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
-// 	protoc        v4.23.3
+// 	protoc        v3.21.12
 // source: message_contents/contact.proto
 
 package message_contents
@@ -130,7 +130,6 @@ type ContactBundle struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to Version:
-	//
 	//	*ContactBundle_V1
 	//	*ContactBundle_V2
 	Version isContactBundle_Version `protobuf_oneof:"version"`
diff --git a/go/message_contents/content.pb.go b/go/message_contents/content.pb.go
index 17dde262..25455f53 100644
--- a/go/message_contents/content.pb.go
+++ b/go/message_contents/content.pb.go
@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
-// 	protoc        v4.23.3
+// 	protoc        v3.21.12
 // source: message_contents/content.proto
 
 package message_contents
diff --git a/go/message_contents/conversation_reference.pb.go b/go/message_contents/conversation_reference.pb.go
index 71bc6fad..5599bab9 100644
--- a/go/message_contents/conversation_reference.pb.go
+++ b/go/message_contents/conversation_reference.pb.go
@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
-// 	protoc        v4.23.3
+// 	protoc        v3.21.12
 // source: message_contents/conversation_reference.proto
 
 package message_contents
diff --git a/go/message_contents/invitation.pb.go b/go/message_contents/invitation.pb.go
index aea64918..f3a9caa1 100644
--- a/go/message_contents/invitation.pb.go
+++ b/go/message_contents/invitation.pb.go
@@ -5,7 +5,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
-// 	protoc        v4.23.3
+// 	protoc        v3.21.12
 // source: message_contents/invitation.proto
 
 package message_contents
@@ -39,7 +39,6 @@ type InvitationV1 struct {
 	// message encryption scheme and keys for this conversation.
 	//
 	// Types that are assignable to Encryption:
-	//
 	//	*InvitationV1_Aes256GcmHkdfSha256
 	Encryption isInvitationV1_Encryption `protobuf_oneof:"encryption"`
 }
@@ -250,7 +249,6 @@ type SealedInvitation struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to Version:
-	//
 	//	*SealedInvitation_V1
 	Version isSealedInvitation_Version `protobuf_oneof:"version"`
 }
diff --git a/go/message_contents/message.pb.go b/go/message_contents/message.pb.go
index 5e213a37..2fcd9ac8 100644
--- a/go/message_contents/message.pb.go
+++ b/go/message_contents/message.pb.go
@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
-// 	protoc        v4.23.3
+// 	protoc        v3.21.12
 // source: message_contents/message.proto
 
 package message_contents
@@ -269,7 +269,6 @@ type Message struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to Version:
-	//
 	//	*Message_V1
 	//	*Message_V2
 	Version isMessage_Version `protobuf_oneof:"version"`
diff --git a/go/message_contents/private_key.pb.go b/go/message_contents/private_key.pb.go
index e1066b6b..95c858d1 100644
--- a/go/message_contents/private_key.pb.go
+++ b/go/message_contents/private_key.pb.go
@@ -6,7 +6,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
-// 	protoc        v4.23.3
+// 	protoc        v3.21.12
 // source: message_contents/private_key.proto
 
 package message_contents
@@ -36,7 +36,6 @@ type SignedPrivateKey struct {
 	// private key
 	//
 	// Types that are assignable to Union:
-	//
 	//	*SignedPrivateKey_Secp256K1_
 	Union isSignedPrivateKey_Union `protobuf_oneof:"union"`
 	// public key for this private key
@@ -182,7 +181,6 @@ type PrivateKey struct {
 	// private key
 	//
 	// Types that are assignable to Union:
-	//
 	//	*PrivateKey_Secp256K1_
 	Union isPrivateKey_Union `protobuf_oneof:"union"`
 	// public key for this private key
@@ -323,7 +321,6 @@ type PrivateKeyBundle struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to Version:
-	//
 	//	*PrivateKeyBundle_V1
 	//	*PrivateKeyBundle_V2
 	Version isPrivateKeyBundle_Version `protobuf_oneof:"version"`
@@ -467,7 +464,6 @@ type EncryptedPrivateKeyBundle struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to Version:
-	//
 	//	*EncryptedPrivateKeyBundle_V1
 	Version isEncryptedPrivateKeyBundle_Version `protobuf_oneof:"version"`
 }
diff --git a/go/message_contents/public_key.pb.go b/go/message_contents/public_key.pb.go
index 4144db6f..09359e9f 100644
--- a/go/message_contents/public_key.pb.go
+++ b/go/message_contents/public_key.pb.go
@@ -4,7 +4,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
-// 	protoc        v4.23.3
+// 	protoc        v3.21.12
 // source: message_contents/public_key.proto
 
 package message_contents
@@ -32,7 +32,6 @@ type UnsignedPublicKey struct {
 
 	CreatedNs uint64 `protobuf:"varint,1,opt,name=created_ns,json=createdNs,proto3" json:"created_ns,omitempty"`
 	// Types that are assignable to Union:
-	//
 	//	*UnsignedPublicKey_Secp256K1Uncompressed_
 	Union isUnsignedPublicKey_Union `protobuf_oneof:"union"`
 }
@@ -224,7 +223,6 @@ type PublicKey struct {
 	Timestamp uint64     `protobuf:"varint,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
 	Signature *Signature `protobuf:"bytes,2,opt,name=signature,proto3,oneof" json:"signature,omitempty"`
 	// Types that are assignable to Union:
-	//
 	//	*PublicKey_Secp256K1Uncompressed_
 	Union isPublicKey_Union `protobuf_oneof:"union"`
 }
diff --git a/go/message_contents/signature.pb.go b/go/message_contents/signature.pb.go
index 8efe6cb5..715a2800 100644
--- a/go/message_contents/signature.pb.go
+++ b/go/message_contents/signature.pb.go
@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
-// 	protoc        v4.23.3
+// 	protoc        v3.21.12
 // source: message_contents/signature.proto
 
 package message_contents
@@ -30,7 +30,6 @@ type Signature struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to Union:
-	//
 	//	*Signature_EcdsaCompact
 	//	*Signature_WalletEcdsaCompact
 	Union isSignature_Union `protobuf_oneof:"union"`
diff --git a/go/mls/message_contents/message.pb.go b/go/mls/message_contents/message.pb.go
index 3d09ef5a..71699fa2 100644
--- a/go/mls/message_contents/message.pb.go
+++ b/go/mls/message_contents/message.pb.go
@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
-// 	protoc        v4.23.3
+// 	protoc        v3.21.12
 // source: mls/message_contents/message.proto
 
 package message_contents
@@ -29,7 +29,6 @@ type WelcomeMessage struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to Version:
-	//
 	//	*WelcomeMessage_V1_
 	Version isWelcomeMessage_Version `protobuf_oneof:"version"`
 }
@@ -97,7 +96,6 @@ type GroupMessage struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to Version:
-	//
 	//	*GroupMessage_V1_
 	Version isGroupMessage_Version `protobuf_oneof:"version"`
 }
diff --git a/go/mls_validation/v1/service.pb.go b/go/mls_validation/v1/service.pb.go
new file mode 100644
index 00000000..f03d9f15
--- /dev/null
+++ b/go/mls_validation/v1/service.pb.go
@@ -0,0 +1,713 @@
+// Message API
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.1
+// 	protoc        v3.21.12
+// source: mls_validation/v1/service.proto
+
+package v1
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// Contains a batch of serialized Key Packages
+type ValidateKeyPackagesRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	KeyPackages []*ValidateKeyPackagesRequest_KeyPackage `protobuf:"bytes,1,rep,name=key_packages,json=keyPackages,proto3" json:"key_packages,omitempty"`
+}
+
+func (x *ValidateKeyPackagesRequest) Reset() {
+	*x = ValidateKeyPackagesRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_mls_validation_v1_service_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ValidateKeyPackagesRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ValidateKeyPackagesRequest) ProtoMessage() {}
+
+func (x *ValidateKeyPackagesRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_mls_validation_v1_service_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ValidateKeyPackagesRequest.ProtoReflect.Descriptor instead.
+func (*ValidateKeyPackagesRequest) Descriptor() ([]byte, []int) {
+	return file_mls_validation_v1_service_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *ValidateKeyPackagesRequest) GetKeyPackages() []*ValidateKeyPackagesRequest_KeyPackage {
+	if x != nil {
+		return x.KeyPackages
+	}
+	return nil
+}
+
+// Response to ValidateKeyPackagesRequest
+type ValidateKeyPackagesResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Responses []*ValidateKeyPackagesResponse_ValidationResponse `protobuf:"bytes,1,rep,name=responses,proto3" json:"responses,omitempty"`
+}
+
+func (x *ValidateKeyPackagesResponse) Reset() {
+	*x = ValidateKeyPackagesResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_mls_validation_v1_service_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ValidateKeyPackagesResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ValidateKeyPackagesResponse) ProtoMessage() {}
+
+func (x *ValidateKeyPackagesResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_mls_validation_v1_service_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ValidateKeyPackagesResponse.ProtoReflect.Descriptor instead.
+func (*ValidateKeyPackagesResponse) Descriptor() ([]byte, []int) {
+	return file_mls_validation_v1_service_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *ValidateKeyPackagesResponse) GetResponses() []*ValidateKeyPackagesResponse_ValidationResponse {
+	if x != nil {
+		return x.Responses
+	}
+	return nil
+}
+
+// Contains a batch of serialized Group Messages
+type ValidateGroupMessagesRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	GroupMessages []*ValidateGroupMessagesRequest_GroupMessage `protobuf:"bytes,1,rep,name=group_messages,json=groupMessages,proto3" json:"group_messages,omitempty"`
+}
+
+func (x *ValidateGroupMessagesRequest) Reset() {
+	*x = ValidateGroupMessagesRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_mls_validation_v1_service_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ValidateGroupMessagesRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ValidateGroupMessagesRequest) ProtoMessage() {}
+
+func (x *ValidateGroupMessagesRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_mls_validation_v1_service_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ValidateGroupMessagesRequest.ProtoReflect.Descriptor instead.
+func (*ValidateGroupMessagesRequest) Descriptor() ([]byte, []int) {
+	return file_mls_validation_v1_service_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *ValidateGroupMessagesRequest) GetGroupMessages() []*ValidateGroupMessagesRequest_GroupMessage {
+	if x != nil {
+		return x.GroupMessages
+	}
+	return nil
+}
+
+// Response to ValidateGroupMessagesRequest
+type ValidateGroupMessagesResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Responses []*ValidateGroupMessagesResponse_ValidationResponse `protobuf:"bytes,1,rep,name=responses,proto3" json:"responses,omitempty"`
+}
+
+func (x *ValidateGroupMessagesResponse) Reset() {
+	*x = ValidateGroupMessagesResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_mls_validation_v1_service_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ValidateGroupMessagesResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ValidateGroupMessagesResponse) ProtoMessage() {}
+
+func (x *ValidateGroupMessagesResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_mls_validation_v1_service_proto_msgTypes[3]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ValidateGroupMessagesResponse.ProtoReflect.Descriptor instead.
+func (*ValidateGroupMessagesResponse) Descriptor() ([]byte, []int) {
+	return file_mls_validation_v1_service_proto_rawDescGZIP(), []int{3}
+}
+
+func (x *ValidateGroupMessagesResponse) GetResponses() []*ValidateGroupMessagesResponse_ValidationResponse {
+	if x != nil {
+		return x.Responses
+	}
+	return nil
+}
+
+// Wrapper for each key package
+type ValidateKeyPackagesRequest_KeyPackage struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	KeyPackageBytesTlsSerialized []byte `protobuf:"bytes,1,opt,name=key_package_bytes_tls_serialized,json=keyPackageBytesTlsSerialized,proto3" json:"key_package_bytes_tls_serialized,omitempty"`
+}
+
+func (x *ValidateKeyPackagesRequest_KeyPackage) Reset() {
+	*x = ValidateKeyPackagesRequest_KeyPackage{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_mls_validation_v1_service_proto_msgTypes[4]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ValidateKeyPackagesRequest_KeyPackage) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ValidateKeyPackagesRequest_KeyPackage) ProtoMessage() {}
+
+func (x *ValidateKeyPackagesRequest_KeyPackage) ProtoReflect() protoreflect.Message {
+	mi := &file_mls_validation_v1_service_proto_msgTypes[4]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ValidateKeyPackagesRequest_KeyPackage.ProtoReflect.Descriptor instead.
+func (*ValidateKeyPackagesRequest_KeyPackage) Descriptor() ([]byte, []int) {
+	return file_mls_validation_v1_service_proto_rawDescGZIP(), []int{0, 0}
+}
+
+func (x *ValidateKeyPackagesRequest_KeyPackage) GetKeyPackageBytesTlsSerialized() []byte {
+	if x != nil {
+		return x.KeyPackageBytesTlsSerialized
+	}
+	return nil
+}
+
+// An individual response to one key package
+type ValidateKeyPackagesResponse_ValidationResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	IsOk                    bool   `protobuf:"varint,1,opt,name=is_ok,json=isOk,proto3" json:"is_ok,omitempty"`
+	ErrorMessage            string `protobuf:"bytes,2,opt,name=error_message,json=errorMessage,proto3" json:"error_message,omitempty"`
+	InstallationId          []byte `protobuf:"bytes,3,opt,name=installation_id,json=installationId,proto3" json:"installation_id,omitempty"`
+	WalletAddress           string `protobuf:"bytes,4,opt,name=wallet_address,json=walletAddress,proto3" json:"wallet_address,omitempty"`
+	CredentialIdentityBytes []byte `protobuf:"bytes,5,opt,name=credential_identity_bytes,json=credentialIdentityBytes,proto3" json:"credential_identity_bytes,omitempty"`
+}
+
+func (x *ValidateKeyPackagesResponse_ValidationResponse) Reset() {
+	*x = ValidateKeyPackagesResponse_ValidationResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_mls_validation_v1_service_proto_msgTypes[5]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ValidateKeyPackagesResponse_ValidationResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ValidateKeyPackagesResponse_ValidationResponse) ProtoMessage() {}
+
+func (x *ValidateKeyPackagesResponse_ValidationResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_mls_validation_v1_service_proto_msgTypes[5]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ValidateKeyPackagesResponse_ValidationResponse.ProtoReflect.Descriptor instead.
+func (*ValidateKeyPackagesResponse_ValidationResponse) Descriptor() ([]byte, []int) {
+	return file_mls_validation_v1_service_proto_rawDescGZIP(), []int{1, 0}
+}
+
+func (x *ValidateKeyPackagesResponse_ValidationResponse) GetIsOk() bool {
+	if x != nil {
+		return x.IsOk
+	}
+	return false
+}
+
+func (x *ValidateKeyPackagesResponse_ValidationResponse) GetErrorMessage() string {
+	if x != nil {
+		return x.ErrorMessage
+	}
+	return ""
+}
+
+func (x *ValidateKeyPackagesResponse_ValidationResponse) GetInstallationId() []byte {
+	if x != nil {
+		return x.InstallationId
+	}
+	return nil
+}
+
+func (x *ValidateKeyPackagesResponse_ValidationResponse) GetWalletAddress() string {
+	if x != nil {
+		return x.WalletAddress
+	}
+	return ""
+}
+
+func (x *ValidateKeyPackagesResponse_ValidationResponse) GetCredentialIdentityBytes() []byte {
+	if x != nil {
+		return x.CredentialIdentityBytes
+	}
+	return nil
+}
+
+// Wrapper for each message
+type ValidateGroupMessagesRequest_GroupMessage struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	GroupMessageBytesTlsSerialized []byte `protobuf:"bytes,1,opt,name=group_message_bytes_tls_serialized,json=groupMessageBytesTlsSerialized,proto3" json:"group_message_bytes_tls_serialized,omitempty"`
+}
+
+func (x *ValidateGroupMessagesRequest_GroupMessage) Reset() {
+	*x = ValidateGroupMessagesRequest_GroupMessage{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_mls_validation_v1_service_proto_msgTypes[6]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ValidateGroupMessagesRequest_GroupMessage) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ValidateGroupMessagesRequest_GroupMessage) ProtoMessage() {}
+
+func (x *ValidateGroupMessagesRequest_GroupMessage) ProtoReflect() protoreflect.Message {
+	mi := &file_mls_validation_v1_service_proto_msgTypes[6]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ValidateGroupMessagesRequest_GroupMessage.ProtoReflect.Descriptor instead.
+func (*ValidateGroupMessagesRequest_GroupMessage) Descriptor() ([]byte, []int) {
+	return file_mls_validation_v1_service_proto_rawDescGZIP(), []int{2, 0}
+}
+
+func (x *ValidateGroupMessagesRequest_GroupMessage) GetGroupMessageBytesTlsSerialized() []byte {
+	if x != nil {
+		return x.GroupMessageBytesTlsSerialized
+	}
+	return nil
+}
+
+// An individual response to one message
+type ValidateGroupMessagesResponse_ValidationResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	IsOk         bool   `protobuf:"varint,1,opt,name=is_ok,json=isOk,proto3" json:"is_ok,omitempty"`
+	ErrorMessage string `protobuf:"bytes,2,opt,name=error_message,json=errorMessage,proto3" json:"error_message,omitempty"`
+	GroupId      string `protobuf:"bytes,3,opt,name=group_id,json=groupId,proto3" json:"group_id,omitempty"`
+}
+
+func (x *ValidateGroupMessagesResponse_ValidationResponse) Reset() {
+	*x = ValidateGroupMessagesResponse_ValidationResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_mls_validation_v1_service_proto_msgTypes[7]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ValidateGroupMessagesResponse_ValidationResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ValidateGroupMessagesResponse_ValidationResponse) ProtoMessage() {}
+
+func (x *ValidateGroupMessagesResponse_ValidationResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_mls_validation_v1_service_proto_msgTypes[7]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ValidateGroupMessagesResponse_ValidationResponse.ProtoReflect.Descriptor instead.
+func (*ValidateGroupMessagesResponse_ValidationResponse) Descriptor() ([]byte, []int) {
+	return file_mls_validation_v1_service_proto_rawDescGZIP(), []int{3, 0}
+}
+
+func (x *ValidateGroupMessagesResponse_ValidationResponse) GetIsOk() bool {
+	if x != nil {
+		return x.IsOk
+	}
+	return false
+}
+
+func (x *ValidateGroupMessagesResponse_ValidationResponse) GetErrorMessage() string {
+	if x != nil {
+		return x.ErrorMessage
+	}
+	return ""
+}
+
+func (x *ValidateGroupMessagesResponse_ValidationResponse) GetGroupId() string {
+	if x != nil {
+		return x.GroupId
+	}
+	return ""
+}
+
+var File_mls_validation_v1_service_proto protoreflect.FileDescriptor
+
+var file_mls_validation_v1_service_proto_rawDesc = []byte{
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+	0x69, 0x6f, 0x6e, 0x2e, 0x76, 0x31, 0x2e, 0x56, 0x61, 0x6c, 0x69, 0x64, 0x61, 0x74, 0x65, 0x4b,
+	0x65, 0x79, 0x50, 0x61, 0x63, 0x6b, 0x61, 0x67, 0x65, 0x73, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e,
+	0x73, 0x65, 0x22, 0x00, 0x12, 0x86, 0x01, 0x0a, 0x15, 0x56, 0x61, 0x6c, 0x69, 0x64, 0x61, 0x74,
+	0x65, 0x47, 0x72, 0x6f, 0x75, 0x70, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x73, 0x12, 0x34,
+	0x2e, 0x78, 0x6d, 0x74, 0x70, 0x2e, 0x6d, 0x6c, 0x73, 0x5f, 0x76, 0x61, 0x6c, 0x69, 0x64, 0x61,
+	0x74, 0x69, 0x6f, 0x6e, 0x2e, 0x76, 0x31, 0x2e, 0x56, 0x61, 0x6c, 0x69, 0x64, 0x61, 0x74, 0x65,
+	0x47, 0x72, 0x6f, 0x75, 0x70, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x73, 0x52, 0x65, 0x71,
+	0x75, 0x65, 0x73, 0x74, 0x1a, 0x35, 0x2e, 0x78, 0x6d, 0x74, 0x70, 0x2e, 0x6d, 0x6c, 0x73, 0x5f,
+	0x76, 0x61, 0x6c, 0x69, 0x64, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x2e, 0x76, 0x31, 0x2e, 0x56, 0x61,
+	0x6c, 0x69, 0x64, 0x61, 0x74, 0x65, 0x47, 0x72, 0x6f, 0x75, 0x70, 0x4d, 0x65, 0x73, 0x73, 0x61,
+	0x67, 0x65, 0x73, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x42, 0x2f, 0x5a,
+	0x2d, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x6d, 0x74, 0x70,
+	0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x76, 0x33, 0x2f, 0x67, 0x6f, 0x2f, 0x6d, 0x6c, 0x73,
+	0x5f, 0x76, 0x61, 0x6c, 0x69, 0x64, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x2f, 0x76, 0x31, 0x62, 0x06,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_mls_validation_v1_service_proto_rawDescOnce sync.Once
+	file_mls_validation_v1_service_proto_rawDescData = file_mls_validation_v1_service_proto_rawDesc
+)
+
+func file_mls_validation_v1_service_proto_rawDescGZIP() []byte {
+	file_mls_validation_v1_service_proto_rawDescOnce.Do(func() {
+		file_mls_validation_v1_service_proto_rawDescData = protoimpl.X.CompressGZIP(file_mls_validation_v1_service_proto_rawDescData)
+	})
+	return file_mls_validation_v1_service_proto_rawDescData
+}
+
+var file_mls_validation_v1_service_proto_msgTypes = make([]protoimpl.MessageInfo, 8)
+var file_mls_validation_v1_service_proto_goTypes = []interface{}{
+	(*ValidateKeyPackagesRequest)(nil),                       // 0: xmtp.mls_validation.v1.ValidateKeyPackagesRequest
+	(*ValidateKeyPackagesResponse)(nil),                      // 1: xmtp.mls_validation.v1.ValidateKeyPackagesResponse
+	(*ValidateGroupMessagesRequest)(nil),                     // 2: xmtp.mls_validation.v1.ValidateGroupMessagesRequest
+	(*ValidateGroupMessagesResponse)(nil),                    // 3: xmtp.mls_validation.v1.ValidateGroupMessagesResponse
+	(*ValidateKeyPackagesRequest_KeyPackage)(nil),            // 4: xmtp.mls_validation.v1.ValidateKeyPackagesRequest.KeyPackage
+	(*ValidateKeyPackagesResponse_ValidationResponse)(nil),   // 5: xmtp.mls_validation.v1.ValidateKeyPackagesResponse.ValidationResponse
+	(*ValidateGroupMessagesRequest_GroupMessage)(nil),        // 6: xmtp.mls_validation.v1.ValidateGroupMessagesRequest.GroupMessage
+	(*ValidateGroupMessagesResponse_ValidationResponse)(nil), // 7: xmtp.mls_validation.v1.ValidateGroupMessagesResponse.ValidationResponse
+}
+var file_mls_validation_v1_service_proto_depIdxs = []int32{
+	4, // 0: xmtp.mls_validation.v1.ValidateKeyPackagesRequest.key_packages:type_name -> xmtp.mls_validation.v1.ValidateKeyPackagesRequest.KeyPackage
+	5, // 1: xmtp.mls_validation.v1.ValidateKeyPackagesResponse.responses:type_name -> xmtp.mls_validation.v1.ValidateKeyPackagesResponse.ValidationResponse
+	6, // 2: xmtp.mls_validation.v1.ValidateGroupMessagesRequest.group_messages:type_name -> xmtp.mls_validation.v1.ValidateGroupMessagesRequest.GroupMessage
+	7, // 3: xmtp.mls_validation.v1.ValidateGroupMessagesResponse.responses:type_name -> xmtp.mls_validation.v1.ValidateGroupMessagesResponse.ValidationResponse
+	0, // 4: xmtp.mls_validation.v1.ValidationApi.ValidateKeyPackages:input_type -> xmtp.mls_validation.v1.ValidateKeyPackagesRequest
+	2, // 5: xmtp.mls_validation.v1.ValidationApi.ValidateGroupMessages:input_type -> xmtp.mls_validation.v1.ValidateGroupMessagesRequest
+	1, // 6: xmtp.mls_validation.v1.ValidationApi.ValidateKeyPackages:output_type -> xmtp.mls_validation.v1.ValidateKeyPackagesResponse
+	3, // 7: xmtp.mls_validation.v1.ValidationApi.ValidateGroupMessages:output_type -> xmtp.mls_validation.v1.ValidateGroupMessagesResponse
+	6, // [6:8] is the sub-list for method output_type
+	4, // [4:6] is the sub-list for method input_type
+	4, // [4:4] is the sub-list for extension type_name
+	4, // [4:4] is the sub-list for extension extendee
+	0, // [0:4] is the sub-list for field type_name
+}
+
+func init() { file_mls_validation_v1_service_proto_init() }
+func file_mls_validation_v1_service_proto_init() {
+	if File_mls_validation_v1_service_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_mls_validation_v1_service_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ValidateKeyPackagesRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_mls_validation_v1_service_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ValidateKeyPackagesResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_mls_validation_v1_service_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ValidateGroupMessagesRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_mls_validation_v1_service_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ValidateGroupMessagesResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_mls_validation_v1_service_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ValidateKeyPackagesRequest_KeyPackage); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_mls_validation_v1_service_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ValidateKeyPackagesResponse_ValidationResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_mls_validation_v1_service_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ValidateGroupMessagesRequest_GroupMessage); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_mls_validation_v1_service_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ValidateGroupMessagesResponse_ValidationResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_mls_validation_v1_service_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   8,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_mls_validation_v1_service_proto_goTypes,
+		DependencyIndexes: file_mls_validation_v1_service_proto_depIdxs,
+		MessageInfos:      file_mls_validation_v1_service_proto_msgTypes,
+	}.Build()
+	File_mls_validation_v1_service_proto = out.File
+	file_mls_validation_v1_service_proto_rawDesc = nil
+	file_mls_validation_v1_service_proto_goTypes = nil
+	file_mls_validation_v1_service_proto_depIdxs = nil
+}
diff --git a/go/mls_validation/v1/service.pb.gw.go b/go/mls_validation/v1/service.pb.gw.go
new file mode 100644
index 00000000..d90d3eb6
--- /dev/null
+++ b/go/mls_validation/v1/service.pb.gw.go
@@ -0,0 +1,256 @@
+// Code generated by protoc-gen-grpc-gateway. DO NOT EDIT.
+// source: mls_validation/v1/service.proto
+
+/*
+Package v1 is a reverse proxy.
+
+It translates gRPC into RESTful JSON APIs.
+*/
+package v1
+
+import (
+	"context"
+	"io"
+	"net/http"
+
+	"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
+	"github.com/grpc-ecosystem/grpc-gateway/v2/utilities"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/proto"
+)
+
+// Suppress "imported and not used" errors
+var _ codes.Code
+var _ io.Reader
+var _ status.Status
+var _ = runtime.String
+var _ = utilities.NewDoubleArray
+var _ = metadata.Join
+
+func request_ValidationApi_ValidateKeyPackages_0(ctx context.Context, marshaler runtime.Marshaler, client ValidationApiClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq ValidateKeyPackagesRequest
+	var metadata runtime.ServerMetadata
+
+	newReader, berr := utilities.IOReaderFactory(req.Body)
+	if berr != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", berr)
+	}
+	if err := marshaler.NewDecoder(newReader()).Decode(&protoReq); err != nil && err != io.EOF {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
+	}
+
+	msg, err := client.ValidateKeyPackages(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
+	return msg, metadata, err
+
+}
+
+func local_request_ValidationApi_ValidateKeyPackages_0(ctx context.Context, marshaler runtime.Marshaler, server ValidationApiServer, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq ValidateKeyPackagesRequest
+	var metadata runtime.ServerMetadata
+
+	newReader, berr := utilities.IOReaderFactory(req.Body)
+	if berr != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", berr)
+	}
+	if err := marshaler.NewDecoder(newReader()).Decode(&protoReq); err != nil && err != io.EOF {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
+	}
+
+	msg, err := server.ValidateKeyPackages(ctx, &protoReq)
+	return msg, metadata, err
+
+}
+
+func request_ValidationApi_ValidateGroupMessages_0(ctx context.Context, marshaler runtime.Marshaler, client ValidationApiClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq ValidateGroupMessagesRequest
+	var metadata runtime.ServerMetadata
+
+	newReader, berr := utilities.IOReaderFactory(req.Body)
+	if berr != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", berr)
+	}
+	if err := marshaler.NewDecoder(newReader()).Decode(&protoReq); err != nil && err != io.EOF {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
+	}
+
+	msg, err := client.ValidateGroupMessages(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
+	return msg, metadata, err
+
+}
+
+func local_request_ValidationApi_ValidateGroupMessages_0(ctx context.Context, marshaler runtime.Marshaler, server ValidationApiServer, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq ValidateGroupMessagesRequest
+	var metadata runtime.ServerMetadata
+
+	newReader, berr := utilities.IOReaderFactory(req.Body)
+	if berr != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", berr)
+	}
+	if err := marshaler.NewDecoder(newReader()).Decode(&protoReq); err != nil && err != io.EOF {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
+	}
+
+	msg, err := server.ValidateGroupMessages(ctx, &protoReq)
+	return msg, metadata, err
+
+}
+
+// RegisterValidationApiHandlerServer registers the http handlers for service ValidationApi to "mux".
+// UnaryRPC     :call ValidationApiServer directly.
+// StreamingRPC :currently unsupported pending https://github.com/grpc/grpc-go/issues/906.
+// Note that using this registration option will cause many gRPC library features to stop working. Consider using RegisterValidationApiHandlerFromEndpoint instead.
+func RegisterValidationApiHandlerServer(ctx context.Context, mux *runtime.ServeMux, server ValidationApiServer) error {
+
+	mux.Handle("POST", pattern_ValidationApi_ValidateKeyPackages_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		var stream runtime.ServerTransportStream
+		ctx = grpc.NewContextWithServerTransportStream(ctx, &stream)
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		var err error
+		var annotatedContext context.Context
+		annotatedContext, err = runtime.AnnotateIncomingContext(ctx, mux, req, "/xmtp.mls_validation.v1.ValidationApi/ValidateKeyPackages", runtime.WithHTTPPathPattern("/xmtp.mls_validation.v1.ValidationApi/ValidateKeyPackages"))
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := local_request_ValidationApi_ValidateKeyPackages_0(annotatedContext, inboundMarshaler, server, req, pathParams)
+		md.HeaderMD, md.TrailerMD = metadata.Join(md.HeaderMD, stream.Header()), metadata.Join(md.TrailerMD, stream.Trailer())
+		annotatedContext = runtime.NewServerMetadataContext(annotatedContext, md)
+		if err != nil {
+			runtime.HTTPError(annotatedContext, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_ValidationApi_ValidateKeyPackages_0(annotatedContext, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
+	mux.Handle("POST", pattern_ValidationApi_ValidateGroupMessages_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		var stream runtime.ServerTransportStream
+		ctx = grpc.NewContextWithServerTransportStream(ctx, &stream)
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		var err error
+		var annotatedContext context.Context
+		annotatedContext, err = runtime.AnnotateIncomingContext(ctx, mux, req, "/xmtp.mls_validation.v1.ValidationApi/ValidateGroupMessages", runtime.WithHTTPPathPattern("/xmtp.mls_validation.v1.ValidationApi/ValidateGroupMessages"))
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := local_request_ValidationApi_ValidateGroupMessages_0(annotatedContext, inboundMarshaler, server, req, pathParams)
+		md.HeaderMD, md.TrailerMD = metadata.Join(md.HeaderMD, stream.Header()), metadata.Join(md.TrailerMD, stream.Trailer())
+		annotatedContext = runtime.NewServerMetadataContext(annotatedContext, md)
+		if err != nil {
+			runtime.HTTPError(annotatedContext, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_ValidationApi_ValidateGroupMessages_0(annotatedContext, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
+	return nil
+}
+
+// RegisterValidationApiHandlerFromEndpoint is same as RegisterValidationApiHandler but
+// automatically dials to "endpoint" and closes the connection when "ctx" gets done.
+func RegisterValidationApiHandlerFromEndpoint(ctx context.Context, mux *runtime.ServeMux, endpoint string, opts []grpc.DialOption) (err error) {
+	conn, err := grpc.DialContext(ctx, endpoint, opts...)
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if err != nil {
+			if cerr := conn.Close(); cerr != nil {
+				grpclog.Infof("Failed to close conn to %s: %v", endpoint, cerr)
+			}
+			return
+		}
+		go func() {
+			<-ctx.Done()
+			if cerr := conn.Close(); cerr != nil {
+				grpclog.Infof("Failed to close conn to %s: %v", endpoint, cerr)
+			}
+		}()
+	}()
+
+	return RegisterValidationApiHandler(ctx, mux, conn)
+}
+
+// RegisterValidationApiHandler registers the http handlers for service ValidationApi to "mux".
+// The handlers forward requests to the grpc endpoint over "conn".
+func RegisterValidationApiHandler(ctx context.Context, mux *runtime.ServeMux, conn *grpc.ClientConn) error {
+	return RegisterValidationApiHandlerClient(ctx, mux, NewValidationApiClient(conn))
+}
+
+// RegisterValidationApiHandlerClient registers the http handlers for service ValidationApi
+// to "mux". The handlers forward requests to the grpc endpoint over the given implementation of "ValidationApiClient".
+// Note: the gRPC framework executes interceptors within the gRPC handler. If the passed in "ValidationApiClient"
+// doesn't go through the normal gRPC flow (creating a gRPC client etc.) then it will be up to the passed in
+// "ValidationApiClient" to call the correct interceptors.
+func RegisterValidationApiHandlerClient(ctx context.Context, mux *runtime.ServeMux, client ValidationApiClient) error {
+
+	mux.Handle("POST", pattern_ValidationApi_ValidateKeyPackages_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		var err error
+		var annotatedContext context.Context
+		annotatedContext, err = runtime.AnnotateContext(ctx, mux, req, "/xmtp.mls_validation.v1.ValidationApi/ValidateKeyPackages", runtime.WithHTTPPathPattern("/xmtp.mls_validation.v1.ValidationApi/ValidateKeyPackages"))
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := request_ValidationApi_ValidateKeyPackages_0(annotatedContext, inboundMarshaler, client, req, pathParams)
+		annotatedContext = runtime.NewServerMetadataContext(annotatedContext, md)
+		if err != nil {
+			runtime.HTTPError(annotatedContext, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_ValidationApi_ValidateKeyPackages_0(annotatedContext, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
+	mux.Handle("POST", pattern_ValidationApi_ValidateGroupMessages_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		var err error
+		var annotatedContext context.Context
+		annotatedContext, err = runtime.AnnotateContext(ctx, mux, req, "/xmtp.mls_validation.v1.ValidationApi/ValidateGroupMessages", runtime.WithHTTPPathPattern("/xmtp.mls_validation.v1.ValidationApi/ValidateGroupMessages"))
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := request_ValidationApi_ValidateGroupMessages_0(annotatedContext, inboundMarshaler, client, req, pathParams)
+		annotatedContext = runtime.NewServerMetadataContext(annotatedContext, md)
+		if err != nil {
+			runtime.HTTPError(annotatedContext, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_ValidationApi_ValidateGroupMessages_0(annotatedContext, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
+	return nil
+}
+
+var (
+	pattern_ValidationApi_ValidateKeyPackages_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1}, []string{"xmtp.mls_validation.v1.ValidationApi", "ValidateKeyPackages"}, ""))
+
+	pattern_ValidationApi_ValidateGroupMessages_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1}, []string{"xmtp.mls_validation.v1.ValidationApi", "ValidateGroupMessages"}, ""))
+)
+
+var (
+	forward_ValidationApi_ValidateKeyPackages_0 = runtime.ForwardResponseMessage
+
+	forward_ValidationApi_ValidateGroupMessages_0 = runtime.ForwardResponseMessage
+)
diff --git a/go/mls_validation/v1/service_grpc.pb.go b/go/mls_validation/v1/service_grpc.pb.go
new file mode 100644
index 00000000..1aa45f6a
--- /dev/null
+++ b/go/mls_validation/v1/service_grpc.pb.go
@@ -0,0 +1,152 @@
+// Message API
+
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.3.0
+// - protoc             v3.21.12
+// source: mls_validation/v1/service.proto
+
+package v1
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.32.0 or later.
+const _ = grpc.SupportPackageIsVersion7
+
+const (
+	ValidationApi_ValidateKeyPackages_FullMethodName   = "/xmtp.mls_validation.v1.ValidationApi/ValidateKeyPackages"
+	ValidationApi_ValidateGroupMessages_FullMethodName = "/xmtp.mls_validation.v1.ValidationApi/ValidateGroupMessages"
+)
+
+// ValidationApiClient is the client API for ValidationApi service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type ValidationApiClient interface {
+	// Validates and parses a batch of key packages and returns relevant details
+	ValidateKeyPackages(ctx context.Context, in *ValidateKeyPackagesRequest, opts ...grpc.CallOption) (*ValidateKeyPackagesResponse, error)
+	// Validates and parses a group message and returns relevant details
+	ValidateGroupMessages(ctx context.Context, in *ValidateGroupMessagesRequest, opts ...grpc.CallOption) (*ValidateGroupMessagesResponse, error)
+}
+
+type validationApiClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewValidationApiClient(cc grpc.ClientConnInterface) ValidationApiClient {
+	return &validationApiClient{cc}
+}
+
+func (c *validationApiClient) ValidateKeyPackages(ctx context.Context, in *ValidateKeyPackagesRequest, opts ...grpc.CallOption) (*ValidateKeyPackagesResponse, error) {
+	out := new(ValidateKeyPackagesResponse)
+	err := c.cc.Invoke(ctx, ValidationApi_ValidateKeyPackages_FullMethodName, in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *validationApiClient) ValidateGroupMessages(ctx context.Context, in *ValidateGroupMessagesRequest, opts ...grpc.CallOption) (*ValidateGroupMessagesResponse, error) {
+	out := new(ValidateGroupMessagesResponse)
+	err := c.cc.Invoke(ctx, ValidationApi_ValidateGroupMessages_FullMethodName, in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// ValidationApiServer is the server API for ValidationApi service.
+// All implementations must embed UnimplementedValidationApiServer
+// for forward compatibility
+type ValidationApiServer interface {
+	// Validates and parses a batch of key packages and returns relevant details
+	ValidateKeyPackages(context.Context, *ValidateKeyPackagesRequest) (*ValidateKeyPackagesResponse, error)
+	// Validates and parses a group message and returns relevant details
+	ValidateGroupMessages(context.Context, *ValidateGroupMessagesRequest) (*ValidateGroupMessagesResponse, error)
+	mustEmbedUnimplementedValidationApiServer()
+}
+
+// UnimplementedValidationApiServer must be embedded to have forward compatible implementations.
+type UnimplementedValidationApiServer struct {
+}
+
+func (UnimplementedValidationApiServer) ValidateKeyPackages(context.Context, *ValidateKeyPackagesRequest) (*ValidateKeyPackagesResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method ValidateKeyPackages not implemented")
+}
+func (UnimplementedValidationApiServer) ValidateGroupMessages(context.Context, *ValidateGroupMessagesRequest) (*ValidateGroupMessagesResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method ValidateGroupMessages not implemented")
+}
+func (UnimplementedValidationApiServer) mustEmbedUnimplementedValidationApiServer() {}
+
+// UnsafeValidationApiServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to ValidationApiServer will
+// result in compilation errors.
+type UnsafeValidationApiServer interface {
+	mustEmbedUnimplementedValidationApiServer()
+}
+
+func RegisterValidationApiServer(s grpc.ServiceRegistrar, srv ValidationApiServer) {
+	s.RegisterService(&ValidationApi_ServiceDesc, srv)
+}
+
+func _ValidationApi_ValidateKeyPackages_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ValidateKeyPackagesRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ValidationApiServer).ValidateKeyPackages(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: ValidationApi_ValidateKeyPackages_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ValidationApiServer).ValidateKeyPackages(ctx, req.(*ValidateKeyPackagesRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _ValidationApi_ValidateGroupMessages_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ValidateGroupMessagesRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ValidationApiServer).ValidateGroupMessages(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: ValidationApi_ValidateGroupMessages_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ValidationApiServer).ValidateGroupMessages(ctx, req.(*ValidateGroupMessagesRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// ValidationApi_ServiceDesc is the grpc.ServiceDesc for ValidationApi service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var ValidationApi_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "xmtp.mls_validation.v1.ValidationApi",
+	HandlerType: (*ValidationApiServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "ValidateKeyPackages",
+			Handler:    _ValidationApi_ValidateKeyPackages_Handler,
+		},
+		{
+			MethodName: "ValidateGroupMessages",
+			Handler:    _ValidationApi_ValidateGroupMessages_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "mls_validation/v1/service.proto",
+}
diff --git a/proto/message_api/v3/mls.proto b/proto/message_api/v3/mls.proto
index 30f6b50a..d958ab10 100644
--- a/proto/message_api/v3/mls.proto
+++ b/proto/message_api/v3/mls.proto
@@ -90,39 +90,37 @@ message PublishWelcomesRequest {
   // An individual welcome message
   message WelcomeMessageRequest {
     // The topic will be derived from this
-    string installation_id = 1;
+    bytes installation_id = 1;
     xmtp.mls.message_contents.WelcomeMessage welcome_message = 2;
   }
 
   repeated WelcomeMessageRequest welcome_messages = 1;
 }
 
+// A wrapper around the Key Package bytes
+message KeyPackageUpload {
+  // This would be a serialized MLS key package that the node would
+  // parse, validate, and then store.
+
+  // The owner's wallet address would be extracted from the identity
+  // credential in the key package, and all signatures would be validated.
+  bytes key_package_tls_serialized = 1;
+}
+
 // Register a new installation
 message RegisterInstallationRequest {
-  bytes credential_bytes = 1;
-  bytes signing_key_public = 2;
+  // The Key Package contains all information needed to register an installation
+  KeyPackageUpload last_resort_key_package = 1;
 }
 
-//
+// The response to a RegisterInstallationRequest
 message RegisterInstallationResponse {
-  string installation_id = 1;
+  bytes installation_id = 1;
 }
 
 // Upload one or more key packages
 message UploadKeyPackagesRequest {
   // An individual key package upload request
-  message KeyPackageUpload {
-    // This would be a serialized MLS key package that the node would
-    // parse, validate, and then store.
-
-    // The owner's wallet address would be extracted from the identity
-    // credential in the key package, and all signatures would be validated.
-    bytes key_package_tls_serialized = 1;
-    // The node will always treat the most recent last-resort key package as
-    // the active one, and will ignore all others.
-    bool is_last_resort = 2;
-  }
-
   repeated KeyPackageUpload key_packages = 1;
 }
 
@@ -131,7 +129,7 @@ message ConsumeKeyPackagesRequest {
   // The caller can provide an array of wallet addresses, and the API
   // will return one key package for each installation associated with each
   // wallet address
-  repeated string installation_ids = 1;
+  repeated bytes installation_ids = 1;
 }
 
 // The response to a ConsumeKeyPackagesRequest
@@ -148,7 +146,7 @@ message ConsumeKeyPackagesResponse {
 
 // Revoke an installation
 message RevokeInstallationRequest {
-  string installation_id = 1;
+  bytes installation_id = 1;
   // All revocations must be validated with a wallet signature over the
   // installation_id being revoked (and some sort of standard prologue)
   xmtp.message_contents.Signature wallet_signature = 2;
@@ -164,12 +162,13 @@ message GetIdentityUpdatesRequest {
 message GetIdentityUpdatesResponse {
   // A new installation ID was seen for the first time by the nodes
   message NewInstallationUpdate {
-    string installation_id = 1;
+    bytes installation_id = 1;
+    bytes credential_identity = 2;
   }
 
   // An installation was revoked
   message RevokedInstallationUpdate {
-    string installation_id = 1;
+    bytes installation_id = 1;
   }
 
   // A wrapper for any update to the wallet
diff --git a/proto/mls/database/intents.proto b/proto/mls/database/intents.proto
new file mode 100644
index 00000000..b50f4223
--- /dev/null
+++ b/proto/mls/database/intents.proto
@@ -0,0 +1,74 @@
+// V3 invite message structure
+
+syntax = "proto3";
+
+package xmtp.mls.database;
+
+option go_package = "github.com/xmtp/proto/v3/go/mls/database";
+option java_package = "org.xmtp.proto.mls.database";
+
+// The data required to publish a message
+message SendMessageData {
+  // V1 of SendMessagePublishData
+  message V1 {
+    bytes payload_bytes = 1;
+  }
+
+  oneof version {
+    V1 v1 = 1;
+  }
+}
+// Wrapper around a list af repeated EVM Account Addresses
+message AccountAddresses {
+  repeated string account_addresses = 1;
+}
+    
+// Wrapper around a list of repeated Installation IDs
+message InstallationIds {
+  repeated bytes installation_ids = 1;
+}
+
+// One of an EVM account address or Installation ID
+message AddressesOrInstallationIds {
+  oneof addresses_or_installation_ids {
+    AccountAddresses account_addresses = 1;
+    InstallationIds installation_ids = 2;
+  }
+}
+
+// The data required to add members to a group
+message AddMembersData {
+  // V1 of AddMembersPublishData
+  message V1 {
+    AddressesOrInstallationIds addresses_or_installation_ids = 1;
+  }
+
+  oneof version {
+    V1 v1 = 1;
+  }
+}
+
+// The data required to remove members from a group
+message RemoveMembersData {
+  // V1 of RemoveMembersPublishData
+  message V1 {
+    AddressesOrInstallationIds addresses_or_installation_ids = 1;
+  }
+
+  oneof version {
+    V1 v1 = 1;
+  }
+}
+
+// Generic data-type for all post-commit actions
+message PostCommitAction {
+  // SendWelcome message
+  message SendWelcomes {
+    repeated bytes installation_ids = 1;
+    bytes welcome_message = 2;
+  }
+
+  oneof kind {
+    SendWelcomes send_welcomes = 1;
+  }
+}
diff --git a/proto/v3/message_contents/association.proto b/proto/mls/message_contents/association.proto
similarity index 75%
rename from proto/v3/message_contents/association.proto
rename to proto/mls/message_contents/association.proto
index 681c510c..a3e41eb0 100644
--- a/proto/v3/message_contents/association.proto
+++ b/proto/mls/message_contents/association.proto
@@ -1,10 +1,10 @@
-// Association types
+// Associations and signatures
 syntax = "proto3";
 
-package xmtp.v3.message_contents;
+package xmtp.mls.message_contents;
 
-option go_package = "github.com/xmtp/proto/v3/go/v3/message_contents";
-option java_package = "org.xmtp.proto.v3.message.contents";
+option go_package = "github.com/xmtp/proto/v3/go/mls/message_contents";
+option java_package = "org.xmtp.proto.mls.message.contents";
 
 // Allows for us to update the format of the association text without
 // incrementing the entire proto
@@ -18,6 +18,7 @@ message Eip191Association {
   AssociationTextVersion association_text_version = 1;
   RecoverableEcdsaSignature signature = 2;
   string wallet_address = 3;
+  string iso8601_time = 4;
 }
 
 // RecoverableEcdsaSignature
diff --git a/proto/mls/message_contents/content.proto b/proto/mls/message_contents/content.proto
new file mode 100644
index 00000000..f6757b97
--- /dev/null
+++ b/proto/mls/message_contents/content.proto
@@ -0,0 +1,42 @@
+// Message content encoding structures
+// Copied from V2 code so that we can eventually retire all V2 message content
+syntax = "proto3";
+
+package xmtp.mls.message_contents;
+
+option go_package = "github.com/xmtp/proto/v3/go/mls/message_contents";
+option java_package = "org.xmtp.proto.mls.message.contents";
+
+// ContentTypeId is used to identify the type of content stored in a Message.
+message ContentTypeId {
+  string authority_id = 1; // authority governing this content type
+  string type_id = 2; // type identifier
+  uint32 version_major = 3; // major version of the type
+  uint32 version_minor = 4; // minor version of the type
+}
+
+// Recognized compression algorithms
+// protolint:disable ENUM_FIELD_NAMES_ZERO_VALUE_END_WITH
+enum Compression {
+  COMPRESSION_DEFLATE = 0;
+  COMPRESSION_GZIP = 1;
+}
+// protolint:enable ENUM_FIELD_NAMES_ZERO_VALUE_END_WITH
+
+// EncodedContent bundles the content with metadata identifying its type
+// and parameters required for correct decoding and presentation of the content.
+message EncodedContent {
+  // content type identifier used to match the payload with
+  // the correct decoding machinery
+  ContentTypeId type = 1;
+  // optional encoding parameters required to correctly decode the content
+  map<string, string> parameters = 2;
+  // optional fallback description of the content that can be used in case
+  // the client cannot decode or render the content
+  optional string fallback = 3;
+  // optional compression; the value indicates algorithm used to
+  // compress the encoded content bytes
+  optional Compression compression = 5;
+  // encoded content itself
+  bytes content = 4;
+}
\ No newline at end of file
diff --git a/proto/mls/message_contents/credential.proto b/proto/mls/message_contents/credential.proto
new file mode 100644
index 00000000..b247fd7f
--- /dev/null
+++ b/proto/mls/message_contents/credential.proto
@@ -0,0 +1,25 @@
+// Credentials and revocations
+syntax = "proto3";
+
+package xmtp.mls.message_contents;
+
+import "mls/message_contents/association.proto";
+
+option go_package = "github.com/xmtp/proto/v3/go/mls/message_contents";
+option java_package = "org.xmtp.proto.mls.message.contents";
+
+// A credential that can be used in MLS leaf nodes
+message MlsCredential {
+  bytes installation_public_key = 1;
+  oneof association {
+    Eip191Association eip_191 = 2;
+  }
+}
+
+// A declaration and proof that a credential is no longer valid
+message CredentialRevocation {
+  bytes installation_public_key = 1;
+  oneof association {
+    Eip191Association eip_191 = 2;
+  }
+}
diff --git a/proto/mls/message_contents/transcript_messages.proto b/proto/mls/message_contents/transcript_messages.proto
new file mode 100644
index 00000000..9a62e9ea
--- /dev/null
+++ b/proto/mls/message_contents/transcript_messages.proto
@@ -0,0 +1,30 @@
+// Message content encoding structures
+syntax = "proto3";
+
+package xmtp.mls.message_contents;
+
+option go_package = "github.com/xmtp/proto/v3/go/mls/message_contents";
+option java_package = "org.xmtp.proto.mls.message.contents";
+
+// A group member and affected installation IDs
+message MembershipChange {
+  repeated bytes installation_ids = 1;
+  string account_address = 2;
+  string initiated_by_account_address = 3;
+}
+
+// The group membership change proto
+message GroupMembershipChanges {
+  // protolint:disable REPEATED_FIELD_NAMES_PLURALIZED
+
+  // Members that have been added in the commit
+  repeated MembershipChange members_added = 1;
+  // Members that have been removed in the commit
+  repeated MembershipChange members_removed = 2;
+  // Installations that have been added in the commit, grouped by member
+  repeated MembershipChange installations_added = 3;
+  // Installations removed in the commit, grouped by member
+  repeated MembershipChange installations_removed = 4;
+
+  // protolint:enable REPEATED_FIELD_NAMES_PLURALIZED
+}
\ No newline at end of file
diff --git a/proto/mls_validation/v1/service.proto b/proto/mls_validation/v1/service.proto
new file mode 100644
index 00000000..68e6bf6c
--- /dev/null
+++ b/proto/mls_validation/v1/service.proto
@@ -0,0 +1,60 @@
+// Message API
+syntax = "proto3";
+package xmtp.mls_validation.v1;
+
+option go_package = "github.com/xmtp/proto/v3/go/mls_validation/v1";
+
+// RPCs for the new MLS API
+service ValidationApi {
+  // Validates and parses a batch of key packages and returns relevant details
+  rpc ValidateKeyPackages(ValidateKeyPackagesRequest) returns (ValidateKeyPackagesResponse) {}
+
+  // Validates and parses a group message and returns relevant details
+  rpc ValidateGroupMessages(ValidateGroupMessagesRequest) returns (ValidateGroupMessagesResponse) {}
+}
+
+// Contains a batch of serialized Key Packages
+message ValidateKeyPackagesRequest {
+  // Wrapper for each key package
+  message KeyPackage {
+    bytes key_package_bytes_tls_serialized = 1;
+  }
+
+  repeated KeyPackage key_packages = 1;
+}
+
+// Response to ValidateKeyPackagesRequest
+message ValidateKeyPackagesResponse {
+  // An individual response to one key package
+  message ValidationResponse {
+    bool is_ok = 1;
+    string error_message = 2;
+    bytes installation_id = 3;
+    string wallet_address = 4;
+    bytes credential_identity_bytes = 5;
+  }
+
+  repeated ValidationResponse responses = 1;
+}
+
+// Contains a batch of serialized Group Messages
+message ValidateGroupMessagesRequest {
+  // Wrapper for each message
+  message GroupMessage {
+    bytes group_message_bytes_tls_serialized = 1;
+  }
+
+  repeated GroupMessage group_messages = 1;
+}
+
+// Response to ValidateGroupMessagesRequest
+message ValidateGroupMessagesResponse {
+  // An individual response to one message
+  message ValidationResponse {
+    bool is_ok = 1;
+    string error_message = 2;
+    string group_id = 3;
+  }
+
+  repeated ValidationResponse responses = 1;
+}
diff --git a/proto/v3/message_contents/invite.proto b/proto/v3/message_contents/invite.proto
deleted file mode 100644
index 4cbd2a69..00000000
--- a/proto/v3/message_contents/invite.proto
+++ /dev/null
@@ -1,37 +0,0 @@
-// V3 invite message structure
-syntax = "proto3";
-
-package xmtp.v3.message_contents;
-
-import "v3/message_contents/public_key.proto";
-
-option go_package = "github.com/xmtp/proto/v3/go/v3/message_contents";
-option java_package = "org.xmtp.proto.v3.message.contents";
-
-// InvitationV1 is the invitation message meant to be encrypted as
-// ciphertext in InvitationEnvelopeV1 and decrypted by the recipient using the
-// provided inviter `InstallationContactBundle`
-message InvitationV1 {
-  // If the inviter contact bundle has the same wallet address as the current
-  // user, the invitee is the other wallet address in the conversation. If the
-  // inviter contact bundle has a different wallet address, the invitee wallet
-  // address MUST be the wallet address of the recipient of the invite.
-  string invitee_wallet_address = 1;
-  // TODO: Decide whether we need a Context field
-}
-
-// InvitationEnvelopeV1 is the encrypted invitation message and the contact of
-// the sender
-message InvitationEnvelopeV1 {
-  // This contains the public key that will be used to decrypt the ciphertext
-  InstallationContactBundle inviter = 1;
-  // Corresponds to an InvitationV1 message
-  bytes ciphertext = 2;
-}
-
-// Wrapper message type
-message InvitationEnvelope {
-  oneof version {
-    InvitationEnvelopeV1 v1 = 1;
-  }
-}
diff --git a/proto/v3/message_contents/message.proto b/proto/v3/message_contents/message.proto
deleted file mode 100644
index 3e51da6e..00000000
--- a/proto/v3/message_contents/message.proto
+++ /dev/null
@@ -1,61 +0,0 @@
-// Structure for messages in v3
-syntax = "proto3";
-
-package xmtp.v3.message_contents;
-
-import "v3/message_contents/association.proto";
-
-option go_package = "github.com/xmtp/proto/v3/go/v3/message_contents";
-option java_package = "org.xmtp.proto.v3.message.contents";
-
-// Metadata that is encrypted via SealedSender and only visible to the recipient
-// Currently we do not actually encrypt this, actual implementation of
-// SealedSender will be added shortly.
-message PadlockMessageSealedMetadata {
-  string sender_user_address = 1;
-  string sender_installation_id = 2;
-  string recipient_user_address = 3;
-  string recipient_installation_id = 4;
-  bool is_prekey_message = 5;
-}
-
-// Plaintext header included with messages, visible to all
-// Recipients can verify this header has not been tampered with.
-// Servers are unable to verify if the header has been tampered with.
-message PadlockMessageHeader {
-  uint64 sent_ns = 1;
-  bytes sealed_metadata = 2; // PadlockMessageSealedMetadata
-}
-
-// The version used for the decrypted padlock message payload
-enum PadlockMessagePayloadVersion {
-  PADLOCK_MESSAGE_PAYLOAD_VERSION_UNSPECIFIED = 0;
-  PADLOCK_MESSAGE_PAYLOAD_VERSION_ONE = 1;
-}
-
-// Encrypted body included with messages, only visible to recipients
-// When receiving a message:
-// 1. Decrypt the sealed metadata in the header via SealedSender
-// 2. Verify that you match the recipient_user_address and
-//    recipient_installation_id. Verify that the sender_installation_id matches
-//    the sender_user_address.
-// 2. Find the relevant session using the sender_user_address and
-//    sender_installation_id in the unsealed metadata
-// 3. Use the session to decrypt the payload
-// 4. Verify that the header_signature in the decrypted payload was produced by
-//    signing the header_bytes with the ed25519 key matching the
-//    sender_installation_id
-// 5. Verify that both the sender_user and recipient_user are partipants of the
-//    conversation referenced by convo_id
-message PadlockMessagePayload {
-  PadlockMessagePayloadVersion message_version = 1;
-  EdDsaSignature header_signature = 2; // Signs PadlockMessageHeader
-  string convo_id = 3;
-  bytes content_bytes = 4; // EncodedContent
-}
-
-// Combines the plaintext header with the encrypted payload
-message PadlockMessageEnvelope {
-  bytes header_bytes = 1; // PadlockMessageHeader
-  bytes ciphertext = 2; // Encrypted PadlockMessagePayload
-}
diff --git a/proto/v3/message_contents/public_key.proto b/proto/v3/message_contents/public_key.proto
deleted file mode 100644
index 523c0b08..00000000
--- a/proto/v3/message_contents/public_key.proto
+++ /dev/null
@@ -1,75 +0,0 @@
-// Structure for representing public keys of different types,
-// including signatures used to authenticate the keys.
-syntax = "proto3";
-
-package xmtp.v3.message_contents;
-
-import "v3/message_contents/association.proto";
-
-option go_package = "github.com/xmtp/proto/v3/go/v3/message_contents";
-option java_package = "org.xmtp.proto.v3.message.contents";
-
-// An unsigned public key used by libxmtp
-message VmacUnsignedPublicKey {
-  uint64 created_ns = 1;
-
-  oneof union {
-    VodozemacCurve25519 curve25519 = 2;
-  }
-
-  // A Vodozemac curve25519 key serialized via serde
-  // (https://github.com/matrix-org/vodozemac/blob/
-  // 929bbaf325686435bdd0ed0d0cc45b0cbad3430d/src/types/curve25519.rs#L100)
-  message VodozemacCurve25519 {
-    bytes bytes = 1;
-  }
-}
-
-// A key linked to an XMTP account (e.g. signed by a wallet)
-// The purpose of the key is encoded in the signature
-message VmacAccountLinkedKey {
-  VmacUnsignedPublicKey key = 1;
-  oneof association {
-    Eip191Association eip_191 = 2;
-  }
-}
-
-// A key linked to an installation (e.g. signed by an installation identity key)
-// The purpose of the key is encoded in the signature
-message VmacInstallationLinkedKey {
-  VmacUnsignedPublicKey key = 1;
-}
-
-// A bundle of one time keys uploaded by a client, to be used as
-// input to (X)3DH exchanges with it. The server is expected to serve
-// and delete one prekey to anyone who requests one.
-// In our initial prototype we will not actually use one-time prekeys,
-// defaulting to fallback keys.
-message VmacOneTimeKeyTopupBundle {
-  VmacAccountLinkedKey identity_key = 1;
-  repeated VmacInstallationLinkedKey one_time_keys = 2;
-}
-
-// A fallback key uploaded by a client, which replaces any existing
-// fallback key. The server is expected to serve this prekey when
-// all one-time prekeys have been exhausted.
-// In our initial prototype we will always use the fallback key in place
-// of any one-time prekeys.
-message VmacFallbackKeyRotation {
-  VmacAccountLinkedKey identity_key = 1;
-  VmacInstallationLinkedKey fallback_key = 2;
-}
-
-// A contact bundle served by the server to a requesting client
-message VmacInstallationPublicKeyBundleV1 {
-  VmacAccountLinkedKey identity_key = 1;
-  VmacInstallationLinkedKey fallback_key = 2;
-}
-
-// A wrapper for versions of the installation contact bundle to allow
-// upgradeability
-message InstallationContactBundle {
-  oneof version {
-    VmacInstallationPublicKeyBundleV1 v1 = 1;
-  }
-}