diff --git a/apps/cli/pisa-cli.py b/apps/cli/pisa-cli.py
index dacca68..3dd22f1 100644
--- a/apps/cli/pisa-cli.py
+++ b/apps/cli/pisa-cli.py
@@ -28,9 +28,8 @@ def generate_dummy_appointment():
 
     current_height = r.json().get("block_count")
 
-    dummy_appointment_data = {"tx": hexlify(os.urandom(192)).decode('utf-8'),
-                              "tx_id": hexlify(os.urandom(32)).decode('utf-8'), "start_time": current_height + 5,
-                              "end_time": current_height + 10, "dispute_delta": 20}
+    dummy_appointment_data = {"tx": os.urandom(192).hex(), "tx_id": os.urandom(32).hex(),
+                              "start_time": current_height + 5, "end_time": current_height + 10, "dispute_delta": 20}
 
     print('Generating dummy appointment data:''\n\n' + json.dumps(dummy_appointment_data, indent=4, sort_keys=True))
 
diff --git a/test/add_appointment_test.py b/test/add_appointment_test.py
index 68fea80..35aa1b0 100644
--- a/test/add_appointment_test.py
+++ b/test/add_appointment_test.py
@@ -18,8 +18,7 @@ def generate_dummy_appointment(dispute_txid):
 
     current_height = r.json().get("block_count")
 
-    dummy_appointment_data = {"tx": hexlify(os.urandom(32)).decode('utf-8'),
-                              "tx_id": dispute_txid, "start_time": current_height + 5,
+    dummy_appointment_data = {"tx": os.urandom(32).hex(), "tx_id": dispute_txid, "start_time": current_height + 5,
                               "end_time": current_height + 10, "dispute_delta": 20}
 
     cipher = "AES-GCM-128"
@@ -40,7 +39,7 @@ def generate_dummy_appointment(dispute_txid):
 
 def test_add_appointment(appointment=None):
     if not appointment:
-        dispute_txid = hexlify(os.urandom(32)).decode('utf-8')
+        dispute_txid = os.urandom(32).hex()
         appointment = generate_dummy_appointment(dispute_txid)
 
     print("Sending appointment (locator: {}) to PISA".format(appointment.get("locator")))
@@ -67,7 +66,7 @@ def test_add_appointment(appointment=None):
 
 
 def test_same_locator_multiple_appointments():
-    dispute_txid = hexlify(os.urandom(32)).decode('utf-8')
+    dispute_txid = os.urandom(32).hex()
     appointment = generate_dummy_appointment(dispute_txid)
 
     # Send it once
diff --git a/test/simulator/bitcoin_sim_tests.py b/test/simulator/bitcoin_sim_tests.py
index dd77baa..bc5f45a 100644
--- a/test/simulator/bitcoin_sim_tests.py
+++ b/test/simulator/bitcoin_sim_tests.py
@@ -32,7 +32,7 @@ assert(len(block.get('tx')) != 0)
 assert(isinstance(block.get('height'), int))
 
 # Some fails
-values += ["a"*64, binascii.hexlify(os.urandom(32)).decode()]
+values += ["a"*64, os.urandom(32).hex()]
 print("\ngetblock fails ({}):".format(len(values)))
 
 for v in values:
@@ -50,14 +50,14 @@ assert(isinstance(tx.get('txid'), str))
 assert(check_txid_format(tx.get('txid')))
 
 # Therefore should also work for a random formatted 32-byte hex in our simulation
-random_tx = binascii.hexlify(os.urandom(32)).decode()
+random_tx = os.urandom(32).hex()
 tx = bitcoin_cli.decoderawtransaction(random_tx)
 assert(isinstance(tx, dict))
 assert(isinstance(tx.get('txid'), str))
 assert(check_txid_format(tx.get('txid')))
 
 # But it should fail for not proper formatted one
-values = [1, None, '', "a"*63, "b"*65, [], binascii.hexlify(os.urandom(31)).hex()]
+values = [1, None, '', "a"*63, "b"*65, [], os.urandom(31).hex()]
 print("\ndecoderawtransaction fails ({}):".format(len(values)))
 
 for v in values:
@@ -68,7 +68,7 @@ for v in values:
         print('\t{}'.format(e))
 
 # sendrawtransaction should only allow txids that the simulator has not mined yet
-bitcoin_cli.sendrawtransaction(binascii.hexlify(os.urandom(32)).decode())
+bitcoin_cli.sendrawtransaction(os.urandom(32).hex())
 
 # Any data not matching the txid format or that matches with an already mined transaction should fail
 values += [coinbase_tx]
diff --git a/test/simulator/bitcoind_sim.py b/test/simulator/bitcoind_sim.py
index 9ba6089..1512c1f 100644
--- a/test/simulator/bitcoind_sim.py
+++ b/test/simulator/bitcoind_sim.py
@@ -172,8 +172,8 @@ def simulate_mining():
     prev_block_hash = None
 
     while True:
-        block_hash = binascii.hexlify(os.urandom(32)).decode('utf-8')
-        coinbase_tx_hash = binascii.hexlify(os.urandom(32)).decode('utf-8')
+        block_hash = os.urandom(32).hex()
+        coinbase_tx_hash = os.urandom(32).hex()
         txs_to_mine = [coinbase_tx_hash]
 
         if len(mempool) != 0:
diff --git a/test/unit/test_cleaner.py b/test/unit/test_cleaner.py
index 5a3bbab..de1be8a 100644
--- a/test/unit/test_cleaner.py
+++ b/test/unit/test_cleaner.py
@@ -20,7 +20,7 @@ def set_up_appointments(total_appointments):
 
     for _ in range(total_appointments):
         uuid = uuid4().hex
-        locator = hexlify(urandom(64))
+        locator = urandom(32).hex()
 
         appointments[uuid] = Appointment(locator, None, None, None, None, None, None)
         locator_uuid_map[locator] = [uuid]
@@ -41,7 +41,7 @@ def set_up_jobs(total_jobs):
 
     for _ in range(total_jobs):
         uuid = uuid4().hex
-        txid = hexlify(urandom(64))
+        txid = urandom(32).hex()
 
         # Assign both justice_txid and dispute_txid the same id (it shouldn't matter)
         jobs[uuid] = Job(txid, txid, None, None, None)