sighash: Add create_watchtower_challenge_page_2_txhandler.

core/src/builder/sighash.rs

@@ -20,6 +20,7 @@ pub fn create_nofn_sighash_stream(
         // Collect kickoff transactions.
         let kickoff_txs = collect_kickoff_txs(db, config.clone(), nofn_xonly_pk, evm_address).await?;
 
+        let mut wcp_txs = Vec::new();
         for tx in kickoff_txs {
             let kickoff_utxo = UTXO {
                 outpoint: OutPoint {
@@ -28,15 +29,31 @@ pub fn create_nofn_sighash_stream(
                 },
                 txout: tx.output[0].clone()
             };
-            let mut tx_handler = builder::transaction::create_watchtower_challenge_page_txhandler(
+            let mut watchtower_challenge_page_tx_handler = builder::transaction::create_watchtower_challenge_page_txhandler(
                 &kickoff_utxo,
                 nofn_xonly_pk,
                 config.bridge_amount_sats,
                 config.num_watchtowers as u32,
                 config.network,
             );
 
-            yield Actor::convert_tx_to_sighash_script_spend(&mut tx_handler, 0, 0)?;
+            yield Actor::convert_tx_to_sighash_script_spend(&mut watchtower_challenge_page_tx_handler, 0, 0)?;
+            wcp_txs.push(watchtower_challenge_page_tx_handler);
+        }
+
+        for watchtower in 0..config.num_watchtowers {
+            let utxo = UTXO { outpoint: OutPoint {
+                txid: wcp_txs[watchtower].tx.compute_txid(),
+                vout: watchtower as u32
+            }, txout: wcp_txs[watchtower].tx.output[watchtower].clone()
+            };
+            let mut watchtower_challenge_page_tx_2_handler = builder::transaction::create_watchtower_challenge_page_2_txhandler(
+                utxo,
+                nofn_xonly_pk,
+                config.network,
+            );
+
+            yield Actor::convert_tx_to_sighash_script_spend(&mut watchtower_challenge_page_tx_2_handler, 0, 0)?;
         }
 
         // First iterate over operators
@@ -69,6 +86,7 @@ async fn collect_kickoff_txs(
                 time_tx_outpoint,
                 nofn_xonly_pk,
                 user_evm_address,
+                config.network,
             );
 
             kickoff_txs.push(kickoff_tx);

core/src/builder/transaction.rs

@@ -4,6 +4,7 @@
 //! transactions.
 
 use super::address::create_taproot_address;
+use super::script;
 use crate::builder;
 use crate::utils::SECP;
 use crate::{utils, EVMAddress, UTXO};
@@ -379,6 +380,34 @@ pub fn create_watchtower_challenge_page_txhandler(
     }
 }
 
+pub fn create_watchtower_challenge_page_2_txhandler(
+    wcp_utxo: UTXO,
+    nofn_xonly_pk: XOnlyPublicKey,
+    network: bitcoin::Network,
+) -> TxHandler {
+    let tx_ins = create_tx_ins(vec![wcp_utxo.outpoint]);
+
+    let nofn_1week = builder::script::generate_relative_timelock_script(nofn_xonly_pk, 7 * 24 * 6);
+    let (nofn_or_nofn_1week, _) =
+        builder::address::create_taproot_address(&[nofn_1week], Some(nofn_xonly_pk), network);
+    // TODO: This also needs to include nofn + operator preimage hash
+    let script_pubkey = nofn_or_nofn_1week.script_pubkey();
+
+    let tx_outs = vec![TxOut {
+        value: wcp_utxo.txout.value - MOVE_TX_MIN_RELAY_FEE,
+        script_pubkey,
+    }];
+
+    let wcptx2 = create_btc_tx(tx_ins, tx_outs);
+
+    TxHandler {
+        tx: wcptx2,
+        prevouts: vec![wcp_utxo.txout.clone()],
+        scripts: vec![vec![]],
+        taproot_spend_infos: vec![],
+    }
+}
+
 pub fn create_slash_or_take_tx(
     deposit_outpoint: OutPoint,
     kickoff_utxo: UTXO,