Implement burn

crates/mockcore/src/lib.rs

@@ -137,6 +137,7 @@ pub struct TransactionTemplate<'a> {
   pub output_values: &'a [u64],
   pub outputs: usize,
   pub p2tr: bool,
+  pub receiver: Option<Address>,
 }
 
 #[derive(Serialize, Deserialize, Debug)]
@@ -185,6 +186,7 @@ impl<'a> Default for TransactionTemplate<'a> {
       output_values: &[],
       outputs: 1,
       p2tr: false,
+      receiver: None,
     }
   }
 }

crates/mockcore/src/state.rs

@@ -232,7 +232,9 @@ impl State {
             .get(i)
             .cloned()
             .unwrap_or(value_per_output),
-          script_pubkey: if template.p2tr {
+          script_pubkey: if template.receiver.is_some() {
+            template.receiver.as_ref().unwrap().script_pubkey()
+          } else if template.p2tr {
             let secp = Secp256k1::new();
             let keypair = KeyPair::new(&secp, &mut rand::thread_rng());
             let internal_key = XOnlyPublicKey::from_keypair(&keypair);