diff --git a/libwallet/src/api_impl/owner.rs b/libwallet/src/api_impl/owner.rs
index cf43605..7764789 100644
--- a/libwallet/src/api_impl/owner.rs
+++ b/libwallet/src/api_impl/owner.rs
@@ -616,7 +616,7 @@ where
 					sender_address: p.sender_address,
 					timestamp: p.timestamp.unwrap().timestamp(),
 					memo: p.memo,
-					promise_signature: p.promise_signature,
+					promise_signature: p.receiver_signature,
 					witness_data: None,
 				},
 				p.sender_part_sig.unwrap(),
diff --git a/libwallet/src/contract/actions/README.md b/libwallet/src/contract/actions/README.md
index c4a1381..931cc59 100644
--- a/libwallet/src/contract/actions/README.md
+++ b/libwallet/src/contract/actions/README.md
@@ -47,7 +47,6 @@ without a user confirmation step.
  - Expose the kernel feature constants from `grin_core` and reuse them here.
  - Move payment-proof handling onto `Slate` so it can be used outside contracts and
    versioned with the slate format
- - Unify legacy and early payment-proof storage
  - Add compact Slatepack support for contracts
  - Keep Slate V5 experimental until the related RFCs are accepted
  - Add contract history, lookup and transport.
diff --git a/libwallet/src/contract/utils.rs b/libwallet/src/contract/utils.rs
index 712d089..a17165e 100644
--- a/libwallet/src/contract/utils.rs
+++ b/libwallet/src/contract/utils.rs
@@ -126,21 +126,20 @@ where
 			};
 
 			tx_log_entry.payment_proof = Some(StoredProofInfo {
-				receiver_address: p.receiver_address,
-				receiver_signature: p.promise_signature,
-				sender_address: sender_address.to_ed25519()?,
-				sender_address_path,
-				sender_signature: None,
-				// Filled as separate steps for now; could be merged into a general case
-				// once we know which nonces here belong to the recipient.
 				proof_type: Some(p.proof_type.as_u8()),
 				receiver_public_nonce: Some(recipient.public_nonce),
 				receiver_public_excess: Some(recipient.public_blind_excess),
 				timestamp: Some(timestamp),
 				memo: p.memo.clone(),
-				promise_signature: p.promise_signature,
 				sender_part_sig: sender.part_sig,
 				sender_public_nonce,
+				..StoredProofInfo::new(
+					p.receiver_address,
+					p.promise_signature,
+					sender_address.to_ed25519()?,
+					sender_address_path,
+					None,
+				)
 			});
 		}
 	}
diff --git a/libwallet/src/types.rs b/libwallet/src/types.rs
index a4ef0a8..a07e79b 100644
--- a/libwallet/src/types.rs
+++ b/libwallet/src/types.rs
@@ -779,14 +779,14 @@ pub struct StoredProofInfo {
 	#[serde(with = "dalek_ser::dalek_pubkey_serde")]
 	pub receiver_address: DalekPublicKey,
 	#[serde(with = "dalek_ser::option_dalek_sig_serde")]
-	/// receiver signature
+	/// Receiver signature for legacy proofs, or promise signature for early proofs
 	pub receiver_signature: Option<DalekSignature>,
 	/// sender address derivation path index
 	pub sender_address_path: u32,
 	/// sender address
 	#[serde(with = "dalek_ser::dalek_pubkey_serde")]
 	pub sender_address: DalekPublicKey,
-	/// sender signature
+	/// Legacy sender signature
 	#[serde(with = "dalek_ser::option_dalek_sig_serde")]
 	pub sender_signature: Option<DalekSignature>,
 	// Fields beyond here are specific to early payment proofs
@@ -800,10 +800,7 @@ pub struct StoredProofInfo {
 	pub timestamp: Option<DateTime<Utc>>,
 	/// Optional payment memo
 	pub memo: Option<PaymentMemo>,
-	/// recipient promise signature
-	#[serde(default, with = "dalek_ser::option_dalek_sig_serde")]
-	pub promise_signature: Option<DalekSignature>,
-	/// Original Sender partial key
+	/// Early-proof sender partial signature
 	pub sender_part_sig: Option<Signature>,
 	/// Untweaked sender public nonce for a sender-nonce proof
 	pub sender_public_nonce: Option<PublicKey>,
@@ -828,7 +825,6 @@ impl StoredProofInfo {
 			receiver_public_excess: None,
 			timestamp: None,
 			memo: None,
-			promise_signature: None,
 			sender_part_sig: None,
 			sender_public_nonce: None,
 		}
@@ -1103,7 +1099,10 @@ mod tests {
 		});
 
 		let proof: StoredProofInfo = serde_json::from_value(proof).unwrap();
-		assert!(proof.promise_signature.is_none());
+		assert!(proof.receiver_signature.is_none());
+		let proof = serde_json::to_value(proof).unwrap();
+		assert!(proof.get("receiver_signature").is_some());
+		assert!(proof.get("promise_signature").is_none());
 	}
 
 	#[test]