diff --git a/client/server.go b/client/server.go
index 51b560b..181ecff 100644
--- a/client/server.go
+++ b/client/server.go
@@ -5,6 +5,7 @@ import (
 	"time"
 
 	"forge.redroom.link/yves/meowlib"
+	"github.com/google/uuid"
 	"google.golang.org/protobuf/proto"
 )
 
@@ -65,6 +66,7 @@ func (ints *InternalServer) AsymDecryptMessage(Message []byte, Signature []byte)
 // Creates a basic message to server from a single packed user message and returns it as protobuf serialized byte array
 func (ints *InternalServer) BuildMessageSendingMessage(usermsg *meowlib.PackedUserMessage) ([]byte, error) {
 	var msg meowlib.ToServerMessage
+	msg.Uuid = uuid.New().String()
 	msg.Type = "1"
 	msg.From = ints.Me.Public
 	msg.Messages = append(msg.Messages, usermsg)
@@ -78,6 +80,7 @@ func (ints *InternalServer) BuildMessageSendingMessage(usermsg *meowlib.PackedUs
 // Creates a basic message to server from a single packed user message and returns it as protobuf serialized byte array
 func (ints *InternalServer) BuildMessageRequestMessage(lookupKeys []string) ([]byte, error) {
 	var msg meowlib.ToServerMessage
+	msg.Uuid = uuid.New().String()
 	msg.Type = "1"
 	msg.From = ints.Me.Public
 
diff --git a/go.mod b/go.mod
index 66bc9ca..0ade208 100644
--- a/go.mod
+++ b/go.mod
@@ -4,6 +4,7 @@ go 1.16
 
 require (
 	github.com/ProtonMail/gopenpgp/v2 v2.2.4
+	github.com/google/uuid v1.3.0
 	github.com/makiuchi-d/gozxing v0.1.1
 	github.com/pkg/errors v0.9.1
 	github.com/rs/zerolog v1.25.0
diff --git a/go.sum b/go.sum
index 2c7f363..e384c4f 100644
--- a/go.sum
+++ b/go.sum
@@ -13,6 +13,8 @@ github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5x
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
 github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
+github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/makiuchi-d/gozxing v0.1.1 h1:xxqijhoedi+/lZlhINteGbywIrewVdVv2wl9r5O9S1I=
diff --git a/messages.pb.go b/messages.pb.go
index 8f53c1c..f7431e6 100644
--- a/messages.pb.go
+++ b/messages.pb.go
@@ -96,6 +96,7 @@ type ToServerMessage struct {
 	PullRequest  []*ToServerMessage_ConversationRequest `protobuf:"bytes,4,rep,name=pullRequest,proto3" json:"pullRequest,omitempty"`
 	Messages     []*PackedUserMessage                   `protobuf:"bytes,5,rep,name=messages,proto3" json:"messages,omitempty"`
 	KnownServers []*Server                              `protobuf:"bytes,6,rep,name=knownServers,proto3" json:"knownServers,omitempty"`
+	Uuid         string                                 `protobuf:"bytes,7,opt,name=uuid,proto3" json:"uuid,omitempty"`
 }
 
 func (x *ToServerMessage) Reset() {
@@ -172,19 +173,26 @@ func (x *ToServerMessage) GetKnownServers() []*Server {
 	return nil
 }
 
+func (x *ToServerMessage) GetUuid() string {
+	if x != nil {
+		return x.Uuid
+	}
+	return ""
+}
+
 // structure defining a from server receiver message decrypted from a "packedmessage" payload
 type FromServerMessage struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Type           string                                             `protobuf:"bytes,1,opt,name=type,proto3" json:"type,omitempty"`                 // Type
-	ServerPubKey   string                                             `protobuf:"bytes,2,opt,name=serverPubKey,proto3" json:"serverPubKey,omitempty"` // My pub key for the server to send me an encrypter answer
-	Payload        []byte                                             `protobuf:"bytes,3,opt,name=payload,proto3" json:"payload,omitempty"`           //
-	ServerReceived uint64                                             `protobuf:"varint,4,opt,name=serverReceived,proto3" json:"serverReceived,omitempty"`
-	ServerUuid     string                                             `protobuf:"bytes,5,opt,name=serverUuid,proto3" json:"serverUuid,omitempty"`
-	PullResponse   map[string]*FromServerMessage_ConversationResponse `protobuf:"bytes,6,rep,name=pullResponse,proto3" json:"pullResponse,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	Chat           []*FromServerMessage_PostedMessage                 `protobuf:"bytes,7,rep,name=chat,proto3" json:"chat,omitempty"`
+	Type            string                                             `protobuf:"bytes,1,opt,name=type,proto3" json:"type,omitempty"`                       // Type
+	ServerPublicKey string                                             `protobuf:"bytes,2,opt,name=serverPublicKey,proto3" json:"serverPublicKey,omitempty"` // Pub key from the server
+	Payload         []byte                                             `protobuf:"bytes,3,opt,name=payload,proto3" json:"payload,omitempty"`                 //
+	UuidAck         string                                             `protobuf:"bytes,4,opt,name=uuidAck,proto3" json:"uuidAck,omitempty"`                 // Ack for the last received ToServerMessage Uuid
+	ServerUuid      string                                             `protobuf:"bytes,5,opt,name=serverUuid,proto3" json:"serverUuid,omitempty"`           // Provides the server uuid that replaced the client uuid
+	PullResponse    map[string]*FromServerMessage_ConversationResponse `protobuf:"bytes,6,rep,name=pullResponse,proto3" json:"pullResponse,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	Chat            []*FromServerMessage_PostedMessage                 `protobuf:"bytes,7,rep,name=chat,proto3" json:"chat,omitempty"`
 }
 
 func (x *FromServerMessage) Reset() {
@@ -226,9 +234,9 @@ func (x *FromServerMessage) GetType() string {
 	return ""
 }
 
-func (x *FromServerMessage) GetServerPubKey() string {
+func (x *FromServerMessage) GetServerPublicKey() string {
 	if x != nil {
-		return x.ServerPubKey
+		return x.ServerPublicKey
 	}
 	return ""
 }
@@ -240,11 +248,11 @@ func (x *FromServerMessage) GetPayload() []byte {
 	return nil
 }
 
-func (x *FromServerMessage) GetServerReceived() uint64 {
+func (x *FromServerMessage) GetUuidAck() string {
 	if x != nil {
-		return x.ServerReceived
+		return x.UuidAck
 	}
-	return 0
+	return ""
 }
 
 func (x *FromServerMessage) GetServerUuid() string {
@@ -946,7 +954,7 @@ var file_messages_proto_rawDesc = []byte{
 	0x66, 0x72, 0x6f, 0x6d, 0x12, 0x18, 0x0a, 0x07, 0x70, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64, 0x18,
 	0x02, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x07, 0x70, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64, 0x12, 0x1c,
 	0x0a, 0x09, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x74, 0x75, 0x72, 0x65, 0x18, 0x03, 0x20, 0x01, 0x28,
-	0x0c, 0x52, 0x09, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x74, 0x75, 0x72, 0x65, 0x22, 0xc2, 0x03, 0x0a,
+	0x0c, 0x52, 0x09, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x74, 0x75, 0x72, 0x65, 0x22, 0xd6, 0x03, 0x0a,
 	0x0f, 0x54, 0x6f, 0x53, 0x65, 0x72, 0x76, 0x65, 0x72, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65,
 	0x12, 0x12, 0x0a, 0x04, 0x74, 0x79, 0x70, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04,
 	0x74, 0x79, 0x70, 0x65, 0x12, 0x12, 0x0a, 0x04, 0x66, 0x72, 0x6f, 0x6d, 0x18, 0x02, 0x20, 0x01,
@@ -963,135 +971,136 @@ var file_messages_proto_rawDesc = []byte{
 	0x52, 0x08, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x73, 0x12, 0x33, 0x0a, 0x0c, 0x6b, 0x6e,
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+	0x33,
 }
 
 var (
diff --git a/pb/messages.proto b/pb/messages.proto
index dc002a7..ddf2088 100644
--- a/pb/messages.proto
+++ b/pb/messages.proto
@@ -28,16 +28,17 @@ message ToServerMessage {
 	repeated PackedUserMessage messages = 5; 
 
     repeated Server knownServers = 6; 
+    string uuid = 7;
 
 }
 
 // structure defining a from server receiver message decrypted from a "packedmessage" payload
 message FromServerMessage {
 	string type = 1; // Type 
-	string serverPubKey = 2 ; // My pub key for the server to send me an encrypter answer
+	string serverPublicKey = 2 ; // Pub key from the server
 	bytes payload = 3 ; // 
-	uint64 serverReceived = 4 ; 
-	string serverUuid = 5 ;
+	string uuidAck = 4 ; // Ack for the last received ToServerMessage Uuid
+	string serverUuid = 5 ; // Provides the server uuid that replaced the client uuid 
 
     message ConversationResponse {
         repeated string messageUuids = 1;
@@ -66,8 +67,8 @@ message Server {
 message ContactCard {
     string name=1;
 	string contactPublicKey =2;
-	string encryptionPublicKey= 3;        
-	string lookupPublicKey  =4;            
+	string encryptionPublicKey= 3;
+	string lookupPublicKey  =4;
 	repeated Server pullServers =5; 
     int32 version = 6;
 }
diff --git a/server/identity.go b/server/identity.go
index 51cc565..0a53f3b 100644
--- a/server/identity.go
+++ b/server/identity.go
@@ -88,6 +88,13 @@ func (id *Identity) DecodeToServerMessage(toServerMessage []byte) (*meowlib.ToSe
 // Outbound processing chain
 //
 
+func (id *Identity) BuildSimpleAckResponseMessage(uuidToAck string) (fromServerMessage *meowlib.FromServerMessage, err error) {
+	var msg meowlib.FromServerMessage
+	msg.ServerPublicKey = id.ServerKp.Public
+	msg.UuidAck = uuidToAck
+	return &msg, nil
+}
+
 // AsymEncryptMessage prepares a message to send to a specific client contact
 func (id *Identity) AsymEncryptMessage(ClientPublicKey string, Message []byte) (EncryptedMsg []byte, Signature []byte, err error) {
 	EncryptedMsg, Signature, err = meowlib.AsymEncryptAndSign(ClientPublicKey, id.ServerKp.Private, Message)
@@ -97,3 +104,15 @@ func (id *Identity) AsymEncryptMessage(ClientPublicKey string, Message []byte) (
 	}
 	return EncryptedMsg, Signature, err
 }
+
+func (id *Identity) PackResponseMessage(encryptedMessage []byte, signature []byte) (fromServerMessage []byte, err error) {
+	var pmsg meowlib.PackedServerMessage
+	pmsg.Payload = encryptedMessage
+	pmsg.Signature = signature
+	pmsg.From = id.ServerKp.Public
+	out, err := proto.Marshal(&pmsg)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}