diff --git a/core/base.py b/core/base.py
index 3e717a0..c718dc9 100644
--- a/core/base.py
+++ b/core/base.py
@@ -100,6 +100,12 @@ class SplitPayload(BaseModel):
     output_data: MintPayloads
 
 
+class CheckPayload(BaseModel):
+    proofs: List[Proof]
+    amount: int
+    output_data: MintPayloads
+
+
 class MeltPayload(BaseModel):
     proofs: List[Proof]
     amount: int
diff --git a/core/db.py b/core/db.py
index c691ca5..dc7fb9d 100644
--- a/core/db.py
+++ b/core/db.py
@@ -119,14 +119,7 @@ class Database(Compat):
 
             psycopg2.extensions.register_type(
                 psycopg2.extensions.new_type(
-                    (1184, 1114),
-                    "TIMESTAMP2INT",
-                    _parse_timestamp
-                    # lambda value, curs: time.mktime(
-                    #     datetime.datetime.strptime(
-                    #         value, "%Y-%m-%d %H:%M:%S.%f"
-                    #     ).timetuple()
-                    # ),
+                    (1184, 1114), "TIMESTAMP2INT", _parse_timestamp
                 )
             )
         else:
diff --git a/mint/ledger.py b/mint/ledger.py
index b0d3795..caab330 100644
--- a/mint/ledger.py
+++ b/mint/ledger.py
@@ -13,7 +13,7 @@ from core.base import Proof, BlindedMessage, BlindedSignature, BasePoint
 import core.b_dhke as b_dhke
 from core.base import Invoice
 from core.db import Database
-from core.settings import MAX_ORDER
+from core.settings import MAX_ORDER, LIGHTNING
 from core.split import amount_split
 from lightning import WALLET
 from mint.crud import (
@@ -179,7 +179,9 @@ class Ledger:
     async def mint(self, B_s, amounts, payment_hash=None):
         """Mints a promise for coins for B_."""
         # check if lightning invoice was paid
-        if payment_hash and not await self._check_lightning_invoice(payment_hash):
+        if LIGHTNING and (
+            payment_hash and not await self._check_lightning_invoice(payment_hash)
+        ):
             raise Exception("Lightning invoice not paid yet.")
 
         for amount in amounts:
@@ -192,13 +194,24 @@ class Ledger:
             promises += [await self._generate_promise(amount, B_) for a in split]
         return promises
 
+    async def melt(self, proofs: List[Proof], amount: int, invoice: str):
+        """Invalidates proofs and pays a Lightning invoice."""
+        if not LIGHTNING:
+            raise Exception("Lightning is not active.")
+        return 0
+
+    async def check_spendable(self, proofs: List[Proof]):
+        """Checks if all provided proofs are valid and still spendable (i.e. have not been spent)."""
+        if not all([self._verify_proof(p) for p in proofs]):
+            return False
+
     async def split(
         self, proofs: List[Proof], amount: int, output_data: List[BlindedMessage]
     ):
         """Consumes proofs and prepares new promises based on the amount split."""
         self._verify_split_amount(amount)
         # Verify proofs are valid
-        if not all([self._verify_proof(p) for p in proofs]):
+        if await self.check_spendable(proofs) == False:
             return False
 
         total = sum([p["amount"] for p in proofs])
diff --git a/tests/test_wallet.py b/tests/test_wallet.py
index c5cd4bd..c7cd235 100644
--- a/tests/test_wallet.py
+++ b/tests/test_wallet.py
@@ -52,10 +52,6 @@ async def run_test():
     wallet1.status()
 
     # Error: We try to double-spend by providing a valid proof twice
-    # try:
-    #     await wallet1.split(wallet1.proofs + proofs, 20),
-    # except Exception as exc:
-    #     print(exc.args[0])
     await assert_err(
         wallet1.split(wallet1.proofs + proofs, 20),
         f"Error: tokens already spent. Secret: {proofs[0]['secret']}",
diff --git a/wallet/cashu.py b/wallet/cashu.py
index 45298cf..d753f17 100755
--- a/wallet/cashu.py
+++ b/wallet/cashu.py
@@ -122,7 +122,7 @@ async def receive(ctx, token: str):
 @click.argument("token", type=str)
 @click.pass_context
 @coro
-async def receive(ctx, token: str):
+async def burn(ctx, token: str):
     wallet: Wallet = ctx.obj["WALLET"]
     await init_wallet(wallet)
     wallet.status()
diff --git a/wallet/wallet.py b/wallet/wallet.py
index 81621c2..543a843 100644
--- a/wallet/wallet.py
+++ b/wallet/wallet.py
@@ -112,6 +112,12 @@ class LedgerAPI:
 
         return fst_proofs, snd_proofs
 
+    def check_spendable(self, proofs):
+        promises_dict = requests.post(
+            self.url + "/check",
+            json=proofs.dict(),
+        ).json()
+
 
 class Wallet(LedgerAPI):
     """Minimal wallet wrapper."""
@@ -154,10 +160,9 @@ class Wallet(LedgerAPI):
             filter(lambda p: p["secret"] not in used_secrets, self.proofs)
         )
         self.proofs += fst_proofs + snd_proofs
-
+        await self._store_proofs(fst_proofs + snd_proofs)
         for proof in proofs:
             await invalidate_proof(proof, db=self.db)
-        await self._store_proofs(fst_proofs + snd_proofs)
         return fst_proofs, snd_proofs
 
     async def split_to_send(self, proofs: List[Proof], amount):
@@ -172,6 +177,9 @@ class Wallet(LedgerAPI):
             proof.reserved = True
             await update_proof_reserved(proof, reserved=reserved, db=self.db)
 
+    async def check_spendable(self, proofs):
+        await super().check_spendable(proofs)
+
     async def invalidate(self, proofs):
         # first we make sure that the server has invalidated these proofs
         try: