From 235a8f6830651ca77c605b69c1a4db5503393aef Mon Sep 17 00:00:00 2001
From: tecnovert <tecnovert@tecnovert.net>
Date: Mon, 4 Aug 2025 21:27:16 +0200
Subject: [PATCH] Explicitly set messagemagic string for Particl v27

---
 basicswap/basicswap.py      | 20 ++++++--------------
 basicswap/interface/btc.py  | 28 +++++++++++++---------------
 basicswap/interface/part.py |  8 ++++++++
 3 files changed, 27 insertions(+), 29 deletions(-)

diff --git a/basicswap/basicswap.py b/basicswap/basicswap.py
index 00d4655..8892692 100644
--- a/basicswap/basicswap.py
+++ b/basicswap/basicswap.py
@@ -2399,8 +2399,8 @@ class BasicSwap(BaseApp, BSXNetwork, UIApp):
             msg_buf = OfferRevokeMessage()
             msg_buf.offer_msg_id = offer_id
 
-            signature_enc = self.callcoinrpc(
-                Coins.PART, "signmessage", [offer.addr_from, offer_id.hex() + "_revoke"]
+            signature_enc = self.ci(Coins.PART).signMessage(
+                offer.addr_from, offer_id.hex() + "_revoke"
             )
 
             msg_buf.signature = base64.b64decode(signature_enc)
@@ -7773,14 +7773,8 @@ class BasicSwap(BaseApp, BSXNetwork, UIApp):
 
             signature_enc = base64.b64encode(msg_data.signature).decode("UTF-8")
 
-            passed = self.callcoinrpc(
-                Coins.PART,
-                "verifymessage",
-                [
-                    offer.addr_from,
-                    signature_enc,
-                    msg_data.offer_msg_id.hex() + "_revoke",
-                ],
+            passed = self.ci(Coins.PART).verifyMessage(
+                offer.addr_from, signature_enc, msg_data.offer_msg_id.hex() + "_revoke"
             )
             ensure(passed is True, "Signature invalid")
 
@@ -12100,10 +12094,8 @@ class BasicSwap(BaseApp, BSXNetwork, UIApp):
         for pair in self._possibly_revoked_offers:
             if offer_id == pair[0]:
                 signature_enc = base64.b64encode(pair[1]).decode("UTF-8")
-                passed = self.callcoinrpc(
-                    Coins.PART,
-                    "verifymessage",
-                    [offer_addr_from, signature_enc, offer_id.hex() + "_revoke"],
+                passed = self.ci(Coins.PART).verifyMessage(
+                    offer_addr_from, signature_enc, offer_id.hex() + "_revoke"
                 )
                 return (
                     True if passed is True else False
diff --git a/basicswap/interface/btc.py b/basicswap/interface/btc.py
index c13698e..4631e1e 100644
--- a/basicswap/interface/btc.py
+++ b/basicswap/interface/btc.py
@@ -1981,6 +1981,15 @@ class BTCInterface(Secp256k1Interface):
             sum_unspent += self.make_int(o["amount"])
         return sum_unspent
 
+    def signMessage(self, address: str, message: str) -> str:
+        return self.rpc_wallet(
+            "signmessage",
+            [address, message],
+        )
+
+    def signMessageWithKey(self, key_wif: str, message: str) -> str:
+        return self.rpc("signmessagewithprivkey", [key_wif, message])
+
     def getProofOfFunds(self, amount_for, extra_commit_bytes):
         # TODO: Lock unspent and use same output/s to fund bid
         unspent_addr = self.getUnspentsByAddr()
@@ -1998,6 +2007,7 @@ class BTCInterface(Secp256k1Interface):
         self._log.debug(f"sign_for_addr {sign_for_addr}")
 
         funds_addr: str = sign_for_addr
+
         if (
             self.using_segwit()
         ):  # TODO: Use isSegwitAddress when scantxoutset can use combo
@@ -2006,6 +2016,7 @@ class BTCInterface(Secp256k1Interface):
             sign_for_addr = self.pkh_to_address(pkh)
             self._log.debug(f"sign_for_addr converted {sign_for_addr}")
 
+        sign_message: str = sign_for_addr + "_swap_proof_" + extra_commit_bytes.hex()
         if self._use_descriptors:
             # https://github.com/bitcoin/bitcoin/issues/10542
             # https://github.com/bitcoin/bitcoin/issues/26046
@@ -2022,7 +2033,6 @@ class BTCInterface(Secp256k1Interface):
                 ],
             )
             hdkeypath = addr_info["hdkeypath"]
-
             sign_for_address_key = None
             for descriptor in priv_keys["descriptors"]:
                 if descriptor["active"] is False or descriptor["internal"] is True:
@@ -2043,22 +2053,10 @@ class BTCInterface(Secp256k1Interface):
                 sign_for_address_key = self.encodeKey(ek._key)
                 break
             assert sign_for_address_key is not None
-            signature = self.rpc(
-                "signmessagewithprivkey",
-                [
-                    sign_for_address_key,
-                    sign_for_addr + "_swap_proof_" + extra_commit_bytes.hex(),
-                ],
-            )
+            signature = self.signMessageWithKey(sign_for_address_key, sign_message)
             del priv_keys
         else:
-            signature = self.rpc_wallet(
-                "signmessage",
-                [
-                    sign_for_addr,
-                    sign_for_addr + "_swap_proof_" + extra_commit_bytes.hex(),
-                ],
-            )
+            signature = self.signMessage(sign_for_addr, sign_message)
 
         prove_utxos = []  # TODO: Send specific utxos
         return (sign_for_addr, signature, prove_utxos)
diff --git a/basicswap/interface/part.py b/basicswap/interface/part.py
index 1475ad1..e4a5949 100644
--- a/basicswap/interface/part.py
+++ b/basicswap/interface/part.py
@@ -190,6 +190,14 @@ class PARTInterface(BTCInterface):
     def combine_non_segwit_prevouts(self):
         raise RuntimeError("No non-segwit outputs found.")
 
+    def signMessage(self, address: str, message: str) -> str:
+        message_magic: str = self.chainparams()["message_magic"]
+        return self.rpc_wallet("signmessage", [address, message, message_magic])
+
+    def signMessageWithKey(self, key_wif: str, message: str) -> str:
+        message_magic: str = self.chainparams()["message_magic"]
+        return self.rpc("signmessagewithprivkey", [key_wif, message, message_magic])
+
 
 class PARTInterfaceBlind(PARTInterface):