diff --git a/cashu/core/nuts/nut19.py b/cashu/core/nuts/nutxx.py
similarity index 100%
rename from cashu/core/nuts/nut19.py
rename to cashu/core/nuts/nutxx.py
diff --git a/cashu/mint/verification.py b/cashu/mint/verification.py
index 5d7d0aa0..ed53f408 100644
--- a/cashu/mint/verification.py
+++ b/cashu/mint/verification.py
@@ -21,7 +21,7 @@
     TransactionError,
     TransactionUnitError,
 )
-from ..core.nuts import nut19
+from ..core.nuts import nutxx
 from ..core.settings import settings
 from ..lightning.base import LightningBackend
 from ..mint.crud import LedgerCrud
@@ -288,4 +288,4 @@ def _verify_mint_quote_witness(
             return True
         if not witness:
             return False
-        return nut19.verify_mint_quote(quote.quote, outputs, quote.pubkey, witness)
\ No newline at end of file
+        return nutxx.verify_mint_quote(quote.quote, outputs, quote.pubkey, witness)
\ No newline at end of file
diff --git a/cashu/wallet/api/router.py b/cashu/wallet/api/router.py
index 1e4de7d3..d37eae42 100644
--- a/cashu/wallet/api/router.py
+++ b/cashu/wallet/api/router.py
@@ -189,7 +189,7 @@ async def swap(
     if incoming_wallet.url == outgoing_wallet.url:
         raise Exception("mints for swap have to be different")
 
-    # get keypair to lock the quote with (NUT19)
+    # get keypair to lock the quote with (NUTXX)
     keypair = await incoming_wallet.get_quote_ephemeral_keypair()
     # request invoice from incoming mint
     mint_quote = await incoming_wallet.request_mint(amount, keypair=keypair)
diff --git a/cashu/wallet/cli/cli.py b/cashu/wallet/cli/cli.py
index d3b6dee4..0c650b62 100644
--- a/cashu/wallet/cli/cli.py
+++ b/cashu/wallet/cli/cli.py
@@ -365,7 +365,7 @@ def mint_invoice_callback(msg: JSONRPCNotficationParams):
         mint_supports_websockets = wallet.mint_info.supports_websocket_mint_quote(
             Method["bolt11"], wallet.unit
         )
-        # get keypair for NUT19 or None
+        # get keypair for quote
         keypair = await wallet.get_quote_ephemeral_keypair()
         if mint_supports_websockets and not no_check:
             mint_quote, subscription = await wallet.request_mint_with_callback(
diff --git a/cashu/wallet/mint_info.py b/cashu/wallet/mint_info.py
index 9405f135..9ed813ae 100644
--- a/cashu/wallet/mint_info.py
+++ b/cashu/wallet/mint_info.py
@@ -57,7 +57,7 @@ def supports_websocket_mint_quote(self, method: Method, unit: Unit) -> bool:
     def supports_mint_quote_signature(self) -> bool:
         if not self.nuts:
             return False
-        nut19 = self.nuts.get(MINT_QUOTE_SIGNATURE_NUT, None)
-        if nut19:
-            return nut19["supported"]
+        nutxx = self.nuts.get(MINT_QUOTE_SIGNATURE_NUT, None)
+        if nutxx:
+            return nutxx["supported"]
         return False
diff --git a/cashu/wallet/wallet.py b/cashu/wallet/wallet.py
index f01bb46c..abbb7d99 100644
--- a/cashu/wallet/wallet.py
+++ b/cashu/wallet/wallet.py
@@ -36,7 +36,7 @@
     PostCheckStateResponse,
     PostMeltQuoteResponse,
 )
-from ..core.nuts import nut19
+from ..core.nuts import nutxx
 from ..core.p2pk import Secret
 from ..core.settings import settings
 from ..core.split import amount_split
@@ -549,7 +549,7 @@ async def mint(
 
         witness: Optional[str] = None
         if quote_privkey:
-            witness = nut19.sign_mint_quote(quote_id, outputs, quote_privkey)
+            witness = nutxx.sign_mint_quote(quote_id, outputs, quote_privkey)
 
         # will raise exception if mint is unsuccessful
         promises = await super().mint(outputs, quote_id, witness)