Consider only L-BTC when calculating wallet balance

lib/core/src/persist/mod.rs

@@ -104,7 +104,20 @@ impl Persister {
     pub(crate) fn insert_or_update_payment_with_wallet_tx(&self, tx: &WalletTx) -> Result<()> {
         let tx_id = tx.txid.to_string();
         let is_tx_confirmed = tx.height.is_some();
-        let amount_sat = tx.balance.values().sum::<i64>();
+        let amount_sat = tx
+            .balance
+            .iter()
+            .filter_map(|(asset_id, balance)| {
+                if *asset_id == lwk_wollet::elements::AssetId::LIQUID_BTC {
+                    return Some(balance);
+                }
+                None
+            })
+            .sum::<i64>();
+        if amount_sat == 0 {
+            log::warn!("Attempted to persist a payment with no output amount: tx_id {tx_id}");
+            return Ok(());
+        }
         let maybe_script_pubkey = tx
             .outputs
             .iter()

lib/core/src/sdk.rs

@@ -2469,7 +2469,17 @@ impl LiquidSdk {
         let transactions = self.onchain_wallet.transactions().await?;
         let wallet_amount_sat = transactions
             .into_iter()
-            .map(|tx| tx.balance.values().sum::<i64>())
+            .map(|tx| {
+                tx.balance
+                    .into_iter()
+                    .filter_map(|(asset_id, balance)| {
+                        if asset_id == lwk_wollet::elements::AssetId::LIQUID_BTC {
+                            return Some(balance);
+                        }
+                        None
+                    })
+                    .sum::<i64>()
+            })
             .sum::<i64>();
         debug!("Onchain wallet balance: {wallet_amount_sat} sats");