From 2245becfecfecec8231b46074dc97f07f711f204 Mon Sep 17 00:00:00 2001
From: Rob Woodgate <robwoodgate@mac.com>
Date: Tue, 31 Mar 2026 08:54:58 +0100
Subject: [PATCH 1/2] fix: verify_proofs_dleq should not early return

---
 cashu/wallet/wallet.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cashu/wallet/wallet.py b/cashu/wallet/wallet.py
index 1b63b8eab..9fb4eae4b 100644
--- a/cashu/wallet/wallet.py
+++ b/cashu/wallet/wallet.py
@@ -937,7 +937,7 @@ def verify_proofs_dleq(self, proofs: List[Proof]):
         for proof in proofs:
             if not proof.dleq:
                 logger.trace("No DLEQ proof in proof.")
-                return
+                continue
             logger.trace("Verifying DLEQ proof.")
             assert proof.id
             assert (

From 950fdf6ee3da498f2a65372a1029f4f197b1097b Mon Sep 17 00:00:00 2001
From: Rob Woodgate <robwoodgate@mac.com>
Date: Thu, 2 Apr 2026 12:21:59 +0100
Subject: [PATCH 2/2] chore: add test

---
 tests/wallet/test_wallet.py | 46 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 45 insertions(+), 1 deletion(-)

diff --git a/tests/wallet/test_wallet.py b/tests/wallet/test_wallet.py
index 192f6335b..7fc4261b8 100644
--- a/tests/wallet/test_wallet.py
+++ b/tests/wallet/test_wallet.py
@@ -5,7 +5,15 @@
 import pytest
 import pytest_asyncio
 
-from cashu.core.base import MeltQuote, MeltQuoteState, MintQuoteState, Proof
+from cashu.core.base import (
+    DLEQWallet,
+    MeltQuote,
+    MeltQuoteState,
+    MintQuoteState,
+    Proof,
+    WalletKeyset,
+)
+from cashu.core.crypto import b_dhke
 from cashu.core.errors import CashuError, KeysetNotFoundError, ProofsAlreadySpentError
 from cashu.core.helpers import sum_proofs
 from cashu.core.settings import settings
@@ -487,6 +495,42 @@ async def test_send_and_redeem(wallet1: Wallet, wallet2: Wallet):
     assert wallet1.available_balance == 32
 
 
+def test_verify_proofs_dleq_mixed_missing_and_invalid_dleq_proofs():
+    class MockWallet:
+        verify_proofs_dleq = Wallet.verify_proofs_dleq
+
+        def __init__(self, keysets):
+            self.keysets = keysets
+
+    mint_private_key = b_dhke.PrivateKey()
+    mint_public_key = mint_private_key.public_key
+    assert mint_public_key
+    keyset = WalletKeyset(public_keys={1: mint_public_key}, unit="sat")
+    wallet = MockWallet({keyset.id: keyset})
+
+    def make_proof(secret: str) -> Proof:
+        B_, r = b_dhke.step1_alice(secret)
+        C_, e, s = b_dhke.step2_bob(B_, mint_private_key)
+        C = b_dhke.step3_alice(C_, r, mint_public_key)
+        return Proof(
+            id=keyset.id,
+            amount=1,
+            secret=secret,
+            C=C.format().hex(),
+            dleq=DLEQWallet(r=r.to_hex(), e=e.to_hex(), s=s.to_hex()),
+        )
+
+    proofs = [make_proof("missing-dleq"), make_proof("invalid-dleq")]
+    proofs[0].dleq = None
+    assert proofs[1].dleq
+    proofs[1].dleq.e = (
+        ("0" if proofs[1].dleq.e[0] != "0" else "1") + proofs[1].dleq.e[1:]
+    )
+
+    with pytest.raises(Exception, match="DLEQ proof invalid."):
+        wallet.verify_proofs_dleq(proofs)
+
+
 @pytest.mark.asyncio
 async def test_invalidate_all_proofs(wallet1: Wallet):
     """Try to invalidate proofs that have not been spent yet. Should not work!"""