diff --git a/app/client.rs b/app/client.rs
index 937ead9..8ccfc97 100644
--- a/app/client.rs
+++ b/app/client.rs
@@ -1,4 +1,3 @@
-use ed25519_dalek::ed25519::signature::SignerMut;
 use std::error::Error;
 use tokio::{io, io::AsyncBufReadExt, select};
 
@@ -7,13 +6,12 @@ use libp2p::{
     mdns,
     request_response::{self, ProtocolSupport},
     swarm::SwarmEvent,
-    Multiaddr,
 };
 use tracing_subscriber::EnvFilter;
 
 use cll2v0::{
     keys,
-    messages::MyRequest,
+    messages::{MyRequest, MyResult},
     protocol::{mk_swarm, MyBehaviourEvent},
 };
 
@@ -148,7 +146,14 @@ pub async fn start(params: ClientParams) -> Result<(), Box<dyn Error>> {
                     message: libp2p::request_response::Message::Response { response, .. },
                 })) => {
                     // println!("response : {:?} {:?} {:?}", peer, request_id, "" );
-                    println!("RESSIG : {}", hex::encode(response.sig.clone()),);
+                    match response {
+                        MyResult::Okay(response) => {
+                            println!("OKAY : {}", hex::encode(response.sig.clone()),);
+                        }
+                        MyResult::Fail(response) => {
+                            println!("FAIL : {}", response);
+                        }
+                    }
                 }
                 e => {
                     println!("OTHER {:?}", e)
diff --git a/app/server.rs b/app/server.rs
index 028ec31..6d1b2df 100644
--- a/app/server.rs
+++ b/app/server.rs
@@ -11,7 +11,7 @@ use tracing_subscriber::EnvFilter;
 
 use cll2v0::{
     db, keys,
-    messages::{MyRequest, MyResponse},
+    messages::{MyRequest, MyResponse, MyResult},
     protocol::{mk_swarm, MyBehaviourEvent},
 };
 
@@ -106,9 +106,9 @@ pub async fn start(params: ServerParams) -> Result<(), Box<dyn Error>> {
                             if let Some(skey) = keychain.get(&pkey.to_bytes()) {
                                 let _ = swarm.behaviour_mut().req_res.send_response(
                                     channel,
-                                    MyResponse {
+                                    MyResult::Okay(MyResponse {
                                         sig: skey.clone().sign(&body).to_bytes().into(),
-                                    },
+                                    }),
                                 );
                             } else {
                                 println!("err0")
diff --git a/src/messages.rs b/src/messages.rs
index 4491385..ab95faf 100644
--- a/src/messages.rs
+++ b/src/messages.rs
@@ -7,8 +7,71 @@ pub struct MyRequest {
     pub sig: Vec<u8>, // FIXME :: fixed length array not supported by serde [u8; 64],
 }
 
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub enum MyResult {
+    Okay(MyResponse),
+    Fail(i64),
+}
+
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct MyResponse {
     // sig: [u8; 64],
     pub sig: Vec<u8>, // FIXME :: fixed length array not supported by serde [u8; 64],
 }
+
+// type TestnetMagic = i64;
+//
+// pub enum NetworkId {
+//     Mainnet,
+//     Testnet(TestnetMagic),
+// }
+//
+// type Version = i64;
+//
+// type Blake2b224Hash = [u8; 24];
+// type ScriptHash = Blake2b224Hash;
+//
+// type TokenName = Vec<u8>;
+// type Currency = (ScriptHash, TokenName);
+//
+// pub struct Init {
+//     version: Version,
+//     network_id: NetworkId,
+//     currencies: Vec<Currency>,
+//     routing: bool,
+//     htlc: bool,
+// }
+//
+// type Positive = i64;
+// type Natural = i64;
+// type Amount = Natural;
+// type Markdown = String;
+// type Milliseconds = Natural;
+//
+// type ChannelId = Vec<u8>;
+//
+// // type ChannelMessage<msg> = (ChannelId, msg)
+//
+// type VerificationKey = [u8; 32];
+//
+// pub struct Open {
+//     currency: Currency,
+//     funding_amount: Amount,
+//     gift_amount: Amount,
+//     respond_period: Milliseconds,
+//     minimum_depth: Positive,
+//     max_htlc_amount: Amount,
+//     max_total_htlc_amount: Amount,
+//     max_htlc_count: Positive,
+//     verification_key: VerificationKey,
+// }
+//
+// pub struct Accept {
+//     respond_period: Milliseconds,
+//     minimum_depth: Positive,
+//     min_htlc_amount: Amount,
+//     max_htlc_amount: Amount,
+//     max_total_htlc_amount: Amount,
+//     max_htlc_count: Positive,
+//     verification_key: VerificationKey,
+// }
diff --git a/src/protocol.rs b/src/protocol.rs
index bb8b12d..60e2a73 100644
--- a/src/protocol.rs
+++ b/src/protocol.rs
@@ -8,12 +8,12 @@ use libp2p::{
 };
 use libp2p_identity::ed25519::Keypair;
 
-use crate::messages::{MyRequest, MyResponse};
+use crate::messages::{MyRequest, MyResult};
 
 #[derive(NetworkBehaviour)]
 pub struct MyBehaviour {
     pub mdns: mdns::tokio::Behaviour,
-    pub req_res: request_response::cbor::Behaviour<MyRequest, MyResponse>,
+    pub req_res: request_response::cbor::Behaviour<MyRequest, MyResult>,
 }
 
 pub fn mk_swarm(
@@ -33,7 +33,7 @@ pub fn mk_swarm(
             let protocol = [(StreamProtocol::new("/sign-me/1"), protocol_support)];
             let config = request_response::Config::default();
             let req_res =
-                request_response::cbor::Behaviour::<MyRequest, MyResponse>::new(protocol, config);
+                request_response::cbor::Behaviour::<MyRequest, MyResult>::new(protocol, config);
             Ok(MyBehaviour { req_res, mdns })
         })?
         .with_swarm_config(|cfg| cfg.with_idle_connection_timeout(Duration::from_secs(u64::MAX)))