diff --git a/Cargo.lock b/Cargo.lock
index d71f2f5..d5b92e7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -939,9 +939,9 @@ checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.80"
+version = "1.0.81"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a56dea16b0a29e94408b9aa5e2940a4eedbd128a1ba20e8f7ae60fd3d465af0e"
+checksum = "3d1597b0c024618f09a9c3b8655b7e430397a36d23fdafec26d6965e9eec3eba"
 dependencies = [
  "unicode-ident",
 ]
@@ -1097,7 +1097,7 @@ dependencies = [
  "rand",
  "serde",
  "serde_json",
- "sp_backend",
+ "sp_client 0.1.0 (git+https://github.com/Sosthene00/sp-backend?branch=sp_client)",
  "tsify",
  "uuid",
  "wasm-bindgen",
@@ -1118,7 +1118,7 @@ dependencies = [
  "serde",
  "serde_json",
  "serde_with",
- "sp_backend",
+ "sp_client 0.1.0 (git+https://github.com/Sosthene00/sp-client?branch=sp_client)",
  "tokio",
  "tokio-stream",
  "tokio-tungstenite",
@@ -1168,18 +1168,18 @@ dependencies = [
 
 [[package]]
 name = "serde"
-version = "1.0.197"
+version = "1.0.198"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3fb1c873e1b9b056a4dc4c0c198b24c3ffa059243875552b2bd0933b1aee4ce2"
+checksum = "9846a40c979031340571da2545a4e5b7c4163bdae79b301d5f86d03979451fcc"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.197"
+version = "1.0.198"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7eb0b34b42edc17f6b7cac84a52a1c5f0e1bb2227e997ca9011ea3dd34e8610b"
+checksum = "e88edab869b01783ba905e7d0153f9fc1a6505a96e4ad3018011eedb838566d9"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1299,9 +1299,21 @@ dependencies = [
 ]
 
 [[package]]
-name = "sp_backend"
+name = "sp_client"
 version = "0.1.0"
-source = "git+https://github.com/Sosthene00/sp-backend?branch=sp_client#d09c92ac7718c34c9ce3ff55298140ebda0b2e1a"
+source = "git+https://github.com/Sosthene00/sp-backend?branch=sp_client#4eaa51ed306fc939f487c0e14208bf36da8c8a26"
+dependencies = [
+ "anyhow",
+ "bitcoin 0.31.2",
+ "serde",
+ "serde_json",
+ "silentpayments",
+]
+
+[[package]]
+name = "sp_client"
+version = "0.1.0"
+source = "git+https://github.com/Sosthene00/sp-client?branch=sp_client#4eaa51ed306fc939f487c0e14208bf36da8c8a26"
 dependencies = [
  "anyhow",
  "bitcoin 0.31.2",
@@ -1330,9 +1342,9 @@ checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
 
 [[package]]
 name = "syn"
-version = "2.0.59"
+version = "2.0.60"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4a6531ffc7b071655e4ce2e04bd464c4830bb585a61cabb96cf808f05172615a"
+checksum = "909518bc7b1c9b779f1bbf07f2929d35af9f0f37e47c6e9ef7f9dddc1e1821f3"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/src/main.rs b/src/main.rs
index 266cdb2..e115aaa 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,11 @@
 use std::{
-    any::Any, collections::HashMap, env, fmt::Debug, net::SocketAddr, str::FromStr, sync::{Arc, Mutex, MutexGuard}
+    any::Any,
+    collections::HashMap,
+    env,
+    fmt::Debug,
+    net::SocketAddr,
+    str::FromStr,
+    sync::{Arc, Mutex, MutexGuard},
 };
 
 use bitcoincore_rpc::json::{self as bitcoin_json};
@@ -20,8 +26,8 @@ use sp_client::bitcoin::{
 use sp_client::{
     bitcoin::secp256k1::{
         rand::{thread_rng, Rng},
-        Error as Secp256k1Error, Keypair, Message as Secp256k1Message, PublicKey, Scalar,
-        Secp256k1, SecretKey, ThirtyTwoByteHash,
+        Keypair, Message as Secp256k1Message, PublicKey,
+        Secp256k1, ThirtyTwoByteHash,
     },
     spclient::SpWallet,
 };
@@ -86,6 +92,7 @@ impl SilentPaymentWallet {
 
 enum BroadcastType {
     Sender(SocketAddr),
+    #[allow(dead_code)]
     ExcludeSender(SocketAddr),
     #[allow(dead_code)]
     ToAll,
@@ -169,55 +176,6 @@ fn spend_from_core(
     }
 }
 
-fn find_owned_outputs(
-    tx: &Transaction,
-    ours: HashMap<Option<Label>, HashMap<XOnlyPublicKey, Scalar>>,
-) -> Result<HashMap<OutPoint, OwnedOutput>> {
-    let mut res: HashMap<OutPoint, OwnedOutput> = HashMap::new();
-    for (label, map) in ours {
-        res.extend(tx.output.iter().enumerate().filter_map(
-            |(i, o)| match XOnlyPublicKey::from_slice(&o.script_pubkey.as_bytes()[2..]) {
-                Ok(key) => {
-                    if let Some(scalar) = map.get(&key) {
-                        match SecretKey::from_slice(&scalar.to_be_bytes()) {
-                            Ok(tweak) => {
-                                let outpoint = OutPoint {
-                                    txid: tx.txid(),
-                                    vout: i as u32,
-                                };
-                                let label_str: Option<String>;
-                                if let Some(l) = &label {
-                                    label_str =
-                                        Some(l.as_inner().to_be_bytes().to_lower_hex_string());
-                                } else {
-                                    label_str = None;
-                                }
-                                return Some((
-                                    outpoint,
-                                    OwnedOutput {
-                                        blockheight: 0,
-                                        tweak: tweak.secret_bytes().to_lower_hex_string(),
-                                        amount: o.value,
-                                        script: o.script_pubkey.as_bytes().to_lower_hex_string(),
-                                        label: label_str,
-                                        spend_status: OutputSpendStatus::Unspent,
-                                    },
-                                ));
-                            }
-                            Err(_) => {
-                                return None;
-                            }
-                        }
-                    }
-                    None
-                }
-                Err(_) => None,
-            },
-        ));
-    }
-    Ok(res)
-}
-
 fn faucet_send(
     sp_address: SilentPaymentAddress,
     sp_wallet: Arc<SilentPaymentWallet>,
@@ -225,7 +183,6 @@ fn faucet_send(
 ) -> Result<Transaction> {
     let mut first_tx: Option<Transaction> = None;
     let final_tx: Transaction;
-    let mut new_outpoints: HashMap<OutPoint, OwnedOutput>;
 
     // do we have a sp output available ?
     let available_outpoints = sp_wallet.get_wallet()?.get_outputs().to_spendable_list();
@@ -270,7 +227,8 @@ fn faucet_send(
                 .create_new_psbt(inputs.clone(), vec![recipient], None)?;
         log::debug!("Created psbt: {}", new_psbt);
         SpClient::set_fees(&mut new_psbt, fee_estimate, sp_address.into())?;
-        wallet.get_client().fill_sp_outputs(&mut new_psbt)?;
+        let partial_secret = wallet.get_client().get_partial_secret_from_psbt(&new_psbt)?;
+        wallet.get_client().fill_sp_outputs(&mut new_psbt, partial_secret)?;
         log::debug!("Definitive psbt: {}", new_psbt);
         let mut aux_rand = [0u8; 32];
         thread_rng().fill(&mut aux_rand);
@@ -279,46 +237,6 @@ fn faucet_send(
         SpClient::finalize_psbt(&mut signed)?;
 
         final_tx = signed.extract_tx()?;
-
-        // take all we need to register the new sp output
-        let outpoints: Vec<(String, u32)> = final_tx
-            .input
-            .iter()
-            .map(|i| (i.previous_output.txid.to_string(), i.previous_output.vout))
-            .collect();
-
-        let our_sp_address: SilentPaymentAddress = wallet
-            .get_client()
-            .sp_receiver
-            .get_receiving_address()
-            .try_into()?;
-        let our_spend_pubkey = our_sp_address.get_spend_key();
-        let secp = Secp256k1::verification_only();
-        let input_pubkeys: Result<Vec<PublicKey>, Secp256k1Error> = inputs
-            .iter()
-            .map(|(_, o)| {
-                let tweak = SecretKey::from_str(&o.tweak)?;
-                our_spend_pubkey.mul_tweak(&secp, &tweak.into())
-            })
-            .collect();
-        let input_pubkeys = input_pubkeys?;
-        let input_pubkeys: Vec<&PublicKey> = input_pubkeys.iter().collect();
-        let partial_tweak = calculate_tweak_data(&input_pubkeys, &outpoints)?;
-        let ecdh_shared_secret =
-            calculate_shared_secret(partial_tweak, wallet.get_client().get_scan_key())?;
-
-        let outputs_to_check: Result<Vec<XOnlyPublicKey>, Secp256k1Error> = final_tx
-            .output
-            .iter()
-            .map(|o| XOnlyPublicKey::from_slice(&o.script_pubkey.as_bytes()[2..]))
-            .collect();
-
-        let ours = wallet
-            .get_client()
-            .sp_receiver
-            .scan_transaction(&ecdh_shared_secret, outputs_to_check?)?;
-
-        new_outpoints = find_owned_outputs(&final_tx, ours)?;
     } else {
         // let's try to spend directly from the mining address
         let secp = Secp256k1::signing_only();
@@ -329,7 +247,7 @@ fn faucet_send(
             spend_from_core(keypair.x_only_public_key().0, shared_daemon.clone())?;
 
         // check that the first output of the transaction pays to the key we just created
-        assert!(
+        debug_assert!(
             core_tx.output[0].script_pubkey
                 == ScriptBuf::new_p2tr_tweaked(
                     keypair.x_only_public_key().0.dangerous_assume_tweaked()
@@ -411,40 +329,12 @@ fn faucet_send(
 
         faucet_tx.input[0].witness.push(final_sig.to_vec());
 
-        // take all we need to register the new sp output
-        let outpoints: Vec<(String, u32)> = vec![(core_tx.txid().to_string(), 0)];
-
         first_tx = Some(core_tx);
 
-        let client = sp_wallet.get_wallet()?;
-
-        let input_pubkey = &keypair.public_key();
-
-        let input_pub_keys: Vec<&PublicKey> = vec![input_pubkey];
-        let partial_tweak = calculate_tweak_data(&input_pub_keys, &outpoints)?;
-        let ecdh_shared_secret =
-            calculate_shared_secret(partial_tweak, client.get_client().get_scan_key())?;
-
-        let p2tr_outs = vec![ext_output_key, change_output_key];
-
-        let ours = client
-            .get_client()
-            .sp_receiver
-            .scan_transaction(&ecdh_shared_secret, p2tr_outs)?;
-
         final_tx = faucet_tx;
-
-        new_outpoints = find_owned_outputs(&final_tx, ours)?;
     }
 
     if let Ok(daemon) = shared_daemon.lock() {
-        // get current blockheight
-        let blkheight: u32 = daemon.get_current_height()?.try_into()?;
-        // update the new outpoints
-        for o in new_outpoints.iter_mut() {
-            o.1.blockheight = blkheight;
-        }
-
         // broadcast one or two transactions
         if first_tx.is_some() {
             daemon.broadcast(&first_tx.unwrap())?;
@@ -454,17 +344,6 @@ fn faucet_send(
         return Err(Error::msg("Failed to lock daemon"));
     }
 
-    // update our sp_client with the change output(s)
-    sp_wallet
-        .get_wallet()?
-        .get_mut_outputs()
-        .extend_from(new_outpoints);
-
-    debug!("{:?}", sp_wallet);
-
-    // save to disk
-    sp_wallet.save()?;
-
     Ok(final_tx)
 }
 
@@ -476,9 +355,33 @@ fn handle_faucet_request(
     if let Ok(sp_address) = SilentPaymentAddress::try_from(msg) {
         debug!("Sending bootstrap coins to {}", sp_address);
         // send bootstrap coins to this sp_address
-        let tx = faucet_send(sp_address, sp_wallet, shared_daemon.clone())?;
-        let partial_tweak =
-            compute_partial_tweak_to_transaction(tx.clone(), shared_daemon.clone())?;
+        let tx = faucet_send(sp_address, sp_wallet.clone(), shared_daemon.clone())?;
+
+        // get the tweak
+        let partial_tweak = compute_partial_tweak_to_transaction(&tx, shared_daemon.clone())?;
+
+        debug!("Got the tweak");
+
+        // get current blockheight
+        let blkheight: u32 = shared_daemon
+            .lock_anyhow()?
+            .get_current_height()?
+            .try_into()?;
+
+        // update our sp_client with the change output(s)
+        sp_wallet.get_wallet()?.update_wallet_with_transaction(
+            &tx,
+            blkheight,
+            partial_tweak,
+        )?;
+        
+        debug!("{:?}", sp_wallet.get_wallet()?.get_outputs());
+
+        debug!("updated the wallet");
+        // save to disk
+        sp_wallet.save()?;
+
+        debug!("saved the wallet");
         Ok(NewTxMessage::new(
             serialize(&tx).to_lower_hex_string(),
             Some(partial_tweak.to_string()),
@@ -594,19 +497,18 @@ async fn handle_connection(
 }
 
 fn compute_partial_tweak_to_transaction(
-    tx: Transaction,
+    tx: &Transaction,
     daemon: Arc<Mutex<Daemon>>,
 ) -> Result<PublicKey> {
     let mut outpoints: Vec<(String, u32)> = Vec::with_capacity(tx.input.len());
     let mut pubkeys: Vec<PublicKey> = Vec::with_capacity(tx.input.len());
-    for input in tx.input {
+    for input in tx.input.iter() {
         outpoints.push((
             input.previous_output.txid.to_string(),
             input.previous_output.vout,
         ));
         let prev_tx = daemon
-            .lock()
-            .map_err(|e| Error::msg(format!("Failed to lock the daemon: {}", e)))?
+            .lock_anyhow()?
             .get_transaction(&input.previous_output.txid, None)
             .map_err(|e| Error::msg(format!("Failed to find previous transaction: {}", e)))?;
 
@@ -642,7 +544,7 @@ fn create_new_tx_message(transaction: Vec<u8>, daemon: Arc<Mutex<Daemon>>) -> Re
         return Err(Error::msg("Can't process coinbase transaction"));
     }
 
-    let partial_tweak = compute_partial_tweak_to_transaction(tx, daemon)?;
+    let partial_tweak = compute_partial_tweak_to_transaction(&tx, daemon)?;
     Ok(NewTxMessage::new(
         transaction.to_lower_hex_string(),
         Some(partial_tweak.to_string()),
@@ -666,35 +568,30 @@ async fn handle_zmq(peers: PeerMap, shared_daemon: SharedDaemon) {
         };
         debug!("Received a message");
 
-        let payload: String =
-            if let (Some(topic), Some(data)) = (core_msg.get(0), core_msg.get(1)) {
-                match std::str::from_utf8(&topic) {
-                    Ok("rawtx") => {
-                        match create_new_tx_message(data.to_vec(), shared_daemon.clone()) {
-                            Ok(m) => serde_json::to_string(&m).expect("This shouldn't fail"),
-                            Err(e) => {
-                                error!("{}", e);
-                                continue;
-                            }
-                        }
-                    }
-                    Ok("hashblock") => todo!(),
-                    _ => {
-                        error!("Unexpected message in zmq");
+        let payload: String = if let (Some(topic), Some(data)) = (core_msg.get(0), core_msg.get(1))
+        {
+            match std::str::from_utf8(&topic) {
+                Ok("rawtx") => match create_new_tx_message(data.to_vec(), shared_daemon.clone()) {
+                    Ok(m) => serde_json::to_string(&m).expect("This shouldn't fail"),
+                    Err(e) => {
+                        error!("{}", e);
                         continue;
                     }
+                },
+                Ok("hashblock") => todo!(),
+                _ => {
+                    error!("Unexpected message in zmq");
+                    continue;
                 }
-            } else {
-                error!("Empty message");
-                continue;
-            };
+            }
+        } else {
+            error!("Empty message");
+            continue;
+        };
 
-        if let Err(e) = broadcast_message(
-            peers.clone(),
-            AnkFlag::NewTx,
-            payload,
-            BroadcastType::ToAll,
-        ) {
+        if let Err(e) =
+            broadcast_message(peers.clone(), AnkFlag::NewTx, payload, BroadcastType::ToAll)
+        {
             log::error!("{}", e.to_string());
         }
     }