diff --git a/xmr-btc/src/lib.rs b/xmr-btc/src/lib.rs
index 3d6e80dc..0430b567 100644
--- a/xmr-btc/src/lib.rs
+++ b/xmr-btc/src/lib.rs
@@ -76,8 +76,9 @@ pub enum Action {
 }
 
 // TODO: This could be moved to the monero module
+#[async_trait]
 pub trait ReceiveTransferProof {
-    fn receive_transfer_proof(&self) -> monero::TransferProof;
+    async fn receive_transfer_proof(&mut self) -> monero::TransferProof;
 }
 
 #[async_trait]
@@ -90,7 +91,7 @@ pub trait MedianTime {
 /// This is called post handshake, after all the keys, addresses and most of the
 /// signatures have been exchanged.
 pub fn action_generator_bob<N, M, B>(
-    network: &'static N,
+    network: &'static mut N,
     monero_ledger: &'static M,
     bitcoin_ledger: &'static B,
     // TODO: Replace this with a new, slimmer struct?
@@ -150,7 +151,7 @@ where
             futures::pin_mut!(poll_until_btc_has_expired);
 
             // the source of this could be the database, this layer doesn't care
-            let transfer_proof = network.receive_transfer_proof();
+            let transfer_proof = network.receive_transfer_proof().await;
 
             let S_b_monero = monero::PublicKey::from_private_key(&monero::PrivateKey::from_scalar(
                 s_b.into_ed25519(),
diff --git a/xmr-btc/tests/on_chain.rs b/xmr-btc/tests/on_chain.rs
index 20e937b7..a5781189 100644
--- a/xmr-btc/tests/on_chain.rs
+++ b/xmr-btc/tests/on_chain.rs
@@ -1,6 +1,7 @@
 pub mod harness;
 
 use anyhow::Result;
+use async_trait::async_trait;
 use genawaiter::GeneratorState;
 use harness::wallet::{bitcoin, monero};
 use xmr_btc::{
@@ -13,14 +14,15 @@ use xmr_btc::{
 
 struct Network;
 
+#[async_trait]
 impl ReceiveTransferProof for Network {
-    fn receive_transfer_proof(&self) -> xmr_btc::monero::TransferProof {
+    async fn receive_transfer_proof(&mut self) -> xmr_btc::monero::TransferProof {
         todo!("use libp2p")
     }
 }
 
 async fn swap_as_bob(
-    network: &'static Network,
+    network: &'static mut Network,
     monero_wallet: &'static monero::BobWallet<'static>,
     bitcoin_wallet: &'static bitcoin::Wallet,
     state: bob::State2,