Add btc_punish_txid to get-swaps response

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- ASB+CONTROLLER: `get-swaps` now includes the `btc_punish_txid` per swap: the Bitcoin punish transaction id. This is deterministic from the swap's locked state, so it is set even before the punish transaction is published.
+
 ## [4.6.5] - 2026-05-26
 
 ## [4.6.4] - 2026-05-21

swap-controller-api/src/lib.rs

@@ -85,6 +85,9 @@ pub struct Swap {
     /// Bitcoin redeem transaction id. Deterministic from the swap's locked state,
     /// so this is set even before the redeem transaction is published.
     pub btc_redeem_txid: String,
+    /// Bitcoin punish transaction id. Deterministic from the swap's locked state,
+    /// so this is set even before the punish transaction is published.
+    pub btc_punish_txid: String,
     pub peer_id: String,
     pub completed: bool,
 }

swap-controller/src/main.rs

@@ -90,6 +90,7 @@ async fn dispatch(cmd: Cmd, client: impl AsbApiClient) -> anyhow::Result<()> {
                 "Rate (BTC/XMR)",
                 "BTC Redeem Fee",
                 "BTC Redeem TxID",
+                "BTC Punish TxID",
                 "Peer ID",
                 "Completed",
             ]);
@@ -110,6 +111,7 @@ async fn dispatch(cmd: Cmd, client: impl AsbApiClient) -> anyhow::Result<()> {
                         &swap.exchange_rate.to_string(),
                         &swap.btc_redeem_fee.to_string(),
                         &swap.btc_redeem_txid,
+                        &swap.btc_punish_txid,
                         &swap.peer_id,
                         &swap.completed.to_string(),
                     ]);

swap-core/src/bitcoin/punish.rs

@@ -51,6 +51,10 @@ impl TxPunish {
         self.digest
     }
 
+    pub fn txid(&self) -> Txid {
+        self.inner.compute_txid()
+    }
+
     pub fn complete(
         self,
         tx_punish_sig_bob: bitcoin::Signature,

swap-machine/src/alice/mod.rs

@@ -1051,7 +1051,7 @@ impl State3 {
         }
     }
 
-    fn tx_punish(&self) -> TxPunish {
+    pub fn tx_punish(&self) -> TxPunish {
         swap_core::bitcoin::TxPunish::new(
             &self.tx_cancel(),
             &self.punish_address,

swap/src/asb/rpc/server.rs

@@ -219,6 +219,7 @@ impl AsbApiServer for RpcImpl {
                 exchange_rate,
                 btc_redeem_fee: state3.tx_redeem_fee,
                 btc_redeem_txid: state3.tx_redeem().txid().to_string(),
+                btc_punish_txid: state3.tx_punish().txid().to_string(),
                 peer_id: peer_id.to_string(),
                 completed: is_complete(&current_alice),
             });