diff --git a/controller/tests/contract_accounts.rs b/controller/tests/contract_accounts.rs
index ba2e52e..bbf15bc 100644
--- a/controller/tests/contract_accounts.rs
+++ b/controller/tests/contract_accounts.rs
@@ -167,6 +167,8 @@ fn contract_accounts_impl(test_dir: &'static str) -> Result<(), libwallet::Error
 			net_change: Some(5_000_000_000),
 			..Default::default()
 		};
+		// Proofs are opt-in; enable and supply the sender address.
+		args.proof_args.suppress_proof = false;
 		args.proof_args.sender_address = sender_address;
 		slate = api.contract_sign(m, &slate, args)?;
 		recipient_address = Some(api.get_slatepack_address(mask2, 0)?.pub_key);
diff --git a/controller/tests/contract_early_proofs_rsr.rs b/controller/tests/contract_early_proofs_rsr.rs
index 5a01ea0..bb353a1 100644
--- a/controller/tests/contract_early_proofs_rsr.rs
+++ b/controller/tests/contract_early_proofs_rsr.rs
@@ -65,8 +65,9 @@ fn contract_early_proofs_rsr_test_impl(test_dir: &'static str) -> Result<(), lib
 			},
 			..Default::default()
 		};
+		// Proofs are opt-in; enable and supply the sender address.
+		args.setup_args.proof_args.suppress_proof = false;
 		args.setup_args.proof_args.sender_address = sender_address;
-		println!("SENDER ADDRESS: {:?}", sender_address);
 		slate = api.contract_new(m, args)?;
 		recipient_address = Some(api.get_slatepack_address(recv_mask, 0)?.pub_key);
 		Ok(())
diff --git a/controller/tests/contract_early_proofs_srs.rs b/controller/tests/contract_early_proofs_srs.rs
index ffcbb71..c84ad83 100644
--- a/controller/tests/contract_early_proofs_srs.rs
+++ b/controller/tests/contract_early_proofs_srs.rs
@@ -71,7 +71,8 @@ fn contract_early_proofs_srs_test_impl(test_dir: &'static str) -> Result<(), lib
 			net_change: Some(5_000_000_000),
 			..Default::default()
 		};
-		// Note sender address explicity added here
+		// Proofs are opt-in; enable and supply the sender address.
+		args.proof_args.suppress_proof = false;
 		args.proof_args.sender_address = sender_address;
 		slate = api.contract_sign(m, &slate, args)?;
 		recipient_address = Some(api.get_slatepack_address(recv_mask, 0)?.pub_key);
diff --git a/controller/tests/contract_rsr.rs b/controller/tests/contract_rsr.rs
index 2821950..f41270c 100644
--- a/controller/tests/contract_rsr.rs
+++ b/controller/tests/contract_rsr.rs
@@ -52,7 +52,6 @@ fn contract_rsr_tx_impl(test_dir: &'static str) -> Result<(), libwallet::Error>
 			},
 			..Default::default()
 		};
-		args.setup_args.proof_args.suppress_proof = true;
 		slate = api.contract_new(m, args)?;
 		Ok(())
 	})?;
@@ -74,8 +73,6 @@ fn contract_rsr_tx_impl(test_dir: &'static str) -> Result<(), libwallet::Error>
 		let args = &mut ContractSetupArgsAPI {
 			..Default::default()
 		};
-		// TODO: This possibly shouldn't be needed here if no proof?
-		args.proof_args.suppress_proof = true;
 		slate = api.contract_sign(m, &slate, args)?;
 		Ok(())
 	})?;
diff --git a/controller/tests/contract_srs.rs b/controller/tests/contract_srs.rs
index 7fb9dcf..a8bff12 100644
--- a/controller/tests/contract_srs.rs
+++ b/controller/tests/contract_srs.rs
@@ -63,7 +63,6 @@ fn contract_srs_tx_impl(test_dir: &'static str) -> Result<(), libwallet::Error>
 			net_change: Some(5_000_000_000),
 			..Default::default()
 		};
-		args.proof_args.suppress_proof = true;
 		slate = api.contract_sign(m, &slate, args)?;
 		Ok(())
 	})?;
@@ -74,7 +73,6 @@ fn contract_srs_tx_impl(test_dir: &'static str) -> Result<(), libwallet::Error>
 		let args = &mut ContractSetupArgsAPI {
 			..Default::default()
 		};
-		args.proof_args.suppress_proof = true;
 		slate = api.contract_sign(m, &slate, args)?;
 		Ok(())
 	})?;
diff --git a/libwallet/src/contract/types.rs b/libwallet/src/contract/types.rs
index 10f6aa3..fe34dc1 100644
--- a/libwallet/src/contract/types.rs
+++ b/libwallet/src/contract/types.rs
@@ -112,7 +112,9 @@ pub struct ProofArgs {
 impl Default for ProofArgs {
 	fn default() -> ProofArgs {
 		ProofArgs {
-			suppress_proof: false,
+			// Proofs are opt-in (#729): a `false` default made the receiver build an
+			// invoice promise with no sender address, failing with NoSenderAddressProvided.
+			suppress_proof: true,
 			proof_type: ProofType::Legacy,
 			sender_address: None,
 		}