diff --git a/.env.example b/.env.example
index b10432b..bf04238 100644
--- a/.env.example
+++ b/.env.example
@@ -1,5 +1,7 @@
 DEBUG = true
 
+CASHU_DIR=~/.cashu
+
 # WALLET
 
 MINT_HOST=127.0.0.1
diff --git a/core/base.py b/core/base.py
index cf391b4..f1b4ebd 100644
--- a/core/base.py
+++ b/core/base.py
@@ -9,6 +9,7 @@ class Proof(BaseModel):
     C: str
     secret: str
     reserved: bool = False  # whether this proof is reserved for sending
+    send_id: str = ""  # unique ID of send attempt
 
     @classmethod
     def from_row(cls, row: Row):
@@ -17,6 +18,7 @@ class Proof(BaseModel):
             C=row[1],
             secret=row[2],
             reserved=row[3] or False,
+            send_id=row[4] or "",
         )
 
     @classmethod
@@ -26,6 +28,7 @@ class Proof(BaseModel):
             C=d["C"],
             secret=d["secret"],
             reserved=d["reserved"] or False,
+            send_id=d["send_id"] or "",
         )
 
     def __getitem__(self, key):
diff --git a/core/settings.py b/core/settings.py
index b8159aa..d24c0c4 100644
--- a/core/settings.py
+++ b/core/settings.py
@@ -1,9 +1,15 @@
+from pathlib import Path
+
 from environs import Env  # type: ignore
 
 env = Env()
 env.read_env()
 
 DEBUG = env.bool("DEBUG", default=False)
+CASHU_DIR = env.str("CASHU_DIR", default="~/.cashu")
+CASHU_DIR = CASHU_DIR.replace("~", str(Path.home()))
+assert len(CASHU_DIR), "CASHU_DIR not defined"
+
 LIGHTNING = env.bool("LIGHTNING", default=True)
 LIGHTNING_FEE_PERCENT = env.float("LIGHTNING_FEE_PERCENT", default=1.0)
 assert LIGHTNING_FEE_PERCENT >= 0, "LIGHTNING_FEE_PERCENT must be at least 0"
diff --git a/lightning/lnbits.py b/lightning/lnbits.py
index 94a49eb..5623b4f 100644
--- a/lightning/lnbits.py
+++ b/lightning/lnbits.py
@@ -8,8 +8,13 @@ import requests
 
 from core.settings import LNBITS_ENDPOINT, LNBITS_KEY
 
-from .base import (InvoiceResponse, PaymentResponse, PaymentStatus,
-                   StatusResponse, Wallet)
+from .base import (
+    InvoiceResponse,
+    PaymentResponse,
+    PaymentStatus,
+    StatusResponse,
+    Wallet,
+)
 
 
 class LNbitsWallet(Wallet):
diff --git a/mint/app.py b/mint/app.py
index 360f318..c115c6c 100644
--- a/mint/app.py
+++ b/mint/app.py
@@ -11,7 +11,12 @@ from secp256k1 import PublicKey
 
 import core.settings as settings
 from core.base import CheckPayload, MeltPayload, MintPayloads, SplitPayload
-from core.settings import MINT_PRIVATE_KEY, MINT_SERVER_HOST, MINT_SERVER_PORT
+from core.settings import (
+    CASHU_DIR,
+    MINT_PRIVATE_KEY,
+    MINT_SERVER_HOST,
+    MINT_SERVER_PORT,
+)
 from lightning import WALLET
 from mint.ledger import Ledger
 from mint.migrations import m001_initial
@@ -33,7 +38,7 @@ def startup(app: FastAPI):
             )
 
         logger.info(f"Lightning balance: {balance} sat")
-
+        logger.info(f"Data dir: {CASHU_DIR}")
         logger.info("Mint started.")
 
 
diff --git a/setup.py b/setup.py
index f9069e7..6563f5c 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,7 @@
-import setuptools
-
 from os import path
 
+import setuptools
+
 this_directory = path.abspath(path.dirname(__file__))
 with open(path.join(this_directory, "README.md"), encoding="utf-8") as f:
     long_description = f.read()
diff --git a/wallet/cashu.py b/wallet/cashu.py
index 37bf8bf..4590f56 100755
--- a/wallet/cashu.py
+++ b/wallet/cashu.py
@@ -5,7 +5,8 @@ import base64
 import json
 import math
 from functools import wraps
-from pathlib import Path
+from itertools import groupby
+from operator import itemgetter
 
 import click
 from bech32 import bech32_decode, bech32_encode, convertbits
@@ -15,7 +16,7 @@ from core.base import Proof
 from core.bolt11 import Invoice
 from core.helpers import fee_reserve
 from core.migrations import migrate_databases
-from core.settings import LIGHTNING, MINT_URL
+from core.settings import CASHU_DIR, LIGHTNING, MINT_URL
 from wallet import migrations
 from wallet.crud import get_reserved_proofs
 from wallet.wallet import Wallet as Wallet
@@ -46,9 +47,7 @@ def cli(
     ctx.ensure_object(dict)
     ctx.obj["HOST"] = host
     ctx.obj["WALLET_NAME"] = walletname
-    ctx.obj["WALLET"] = Wallet(
-        ctx.obj["HOST"], f"{str(Path.home())}/.cashu/{walletname}", walletname
-    )
+    ctx.obj["WALLET"] = Wallet(ctx.obj["HOST"], f"{CASHU_DIR}/{walletname}", walletname)
     pass
 
 
@@ -106,8 +105,8 @@ async def send(ctx, amount: int):
     wallet.status()
     _, send_proofs = await wallet.split_to_send(wallet.proofs, amount)
     await wallet.set_reserved(send_proofs, reserved=True)
-    proofs_serialized = [p.dict() for p in send_proofs]
-    print(base64.urlsafe_b64encode(json.dumps(proofs_serialized).encode()).decode())
+    token = await wallet.serialize_proofs(send_proofs)
+    print(token)
     wallet.status()
 
 
@@ -146,6 +145,25 @@ async def burn(ctx, token: str, all: bool):
     wallet.status()
 
 
+@cli.command("pending", help="Show pending tokens.")
+@click.pass_context
+@coro
+async def pending(ctx):
+    wallet: Wallet = ctx.obj["WALLET"]
+    await init_wallet(wallet)
+    wallet.status()
+    reserved_proofs = await get_reserved_proofs(wallet.db)
+    if len(reserved_proofs):
+        sorted_proofs = sorted(reserved_proofs, key=itemgetter("send_id"))
+        for key, value in groupby(sorted_proofs, key=itemgetter("send_id")):
+            grouped_proofs = list(value)
+            token = await wallet.serialize_proofs(grouped_proofs)
+            print(
+                f"Amount: {sum([p['amount'] for p in grouped_proofs])} sat. ID: {key}"
+            )
+            print(token)
+
+
 @cli.command("pay", help="Pay lightning invoice.")
 @click.argument("invoice", type=str)
 @click.pass_context
diff --git a/wallet/crud.py b/wallet/crud.py
index 555715f..55bb293 100644
--- a/wallet/crud.py
+++ b/wallet/crud.py
@@ -1,4 +1,4 @@
-import secrets
+import time
 from typing import Optional
 
 from core.base import Proof
@@ -14,14 +14,10 @@ async def store_proof(
     await (conn or db).execute(
         """
         INSERT INTO proofs
-          (amount, C, secret)
-        VALUES (?, ?, ?)
+          (amount, C, secret, time_created)
+        VALUES (?, ?, ?, ?)
         """,
-        (
-            proof.amount,
-            str(proof.C),
-            str(proof.secret),
-        ),
+        (proof.amount, str(proof.C), str(proof.secret), int(time.time())),
     )
 
 
@@ -69,24 +65,35 @@ async def invalidate_proof(
     await (conn or db).execute(
         """
         INSERT INTO proofs_used
-          (amount, C, secret)
-        VALUES (?, ?, ?)
+          (amount, C, secret, time_used)
+        VALUES (?, ?, ?, ?)
         """,
-        (
-            proof.amount,
-            str(proof.C),
-            str(proof.secret),
-        ),
+        (proof.amount, str(proof.C), str(proof.secret), int(time.time())),
     )
 
 
 async def update_proof_reserved(
     proof: Proof,
     reserved: bool,
-    db: Database,
+    send_id: str = None,
+    db: Database = None,
     conn: Optional[Connection] = None,
 ):
+    clauses = []
+    values = []
+    clauses.append("reserved = ?")
+    values.append(reserved)
+
+    if send_id:
+        clauses.append("send_id = ?")
+        values.append(send_id)
+
+    if reserved:
+        # set the time of reserving
+        clauses.append("time_reserved = ?")
+        values.append(int(time.time()))
+
     await (conn or db).execute(
-        "UPDATE proofs SET reserved = ? WHERE secret = ?",
-        (reserved, str(proof.secret)),
+        f"UPDATE proofs SET {', '.join(clauses)} WHERE secret = ?",
+        (*values, str(proof.secret)),
     )
diff --git a/wallet/migrations.py b/wallet/migrations.py
index 8dc0229..269f495 100644
--- a/wallet/migrations.py
+++ b/wallet/migrations.py
@@ -68,3 +68,14 @@ async def m002_add_proofs_reserved(db):
     """
 
     await db.execute("ALTER TABLE proofs ADD COLUMN reserved BOOL")
+
+
+async def m003_add_proofs_sendid(db):
+    """
+    Column with unique ID for each initiated send attempt
+    so proofs can be later grouped together for each send attempt.
+    """
+    await db.execute("ALTER TABLE proofs ADD COLUMN send_id TEXT")
+    await db.execute("ALTER TABLE proofs ADD COLUMN time_created TIMESTAMP")
+    await db.execute("ALTER TABLE proofs ADD COLUMN time_reserved TIMESTAMP")
+    await db.execute("ALTER TABLE proofs_used ADD COLUMN time_used TIMESTAMP")
diff --git a/wallet/wallet.py b/wallet/wallet.py
index c34a946..58929c5 100644
--- a/wallet/wallet.py
+++ b/wallet/wallet.py
@@ -1,4 +1,7 @@
+import base64
+import json
 import random
+import uuid
 from typing import List
 
 import requests
@@ -186,6 +189,14 @@ class Wallet(LedgerAPI):
             raise Exception("could not pay invoice.")
         return status["paid"]
 
+    @staticmethod
+    async def serialize_proofs(proofs: List[Proof]):
+        proofs_serialized = [p.dict() for p in proofs]
+        token = base64.urlsafe_b64encode(
+            json.dumps(proofs_serialized).encode()
+        ).decode()
+        return token
+
     async def split_to_send(self, proofs: List[Proof], amount):
         """Like self.split but only considers non-reserved tokens."""
         if len([p for p in proofs if not p.reserved]) <= 0:
@@ -194,9 +205,12 @@ class Wallet(LedgerAPI):
 
     async def set_reserved(self, proofs: List[Proof], reserved: bool):
         """Mark a proof as reserved to avoid reuse or delete marking."""
+        uuid_str = str(uuid.uuid1())
         for proof in proofs:
             proof.reserved = True
-            await update_proof_reserved(proof, reserved=reserved, db=self.db)
+            await update_proof_reserved(
+                proof, reserved=reserved, send_id=uuid_str, db=self.db
+            )
 
     async def check_spendable(self, proofs):
         return await super().check_spendable(proofs)