diff --git a/requirements.in b/requirements.in
index 899df4a8..8d04fa62 100644
--- a/requirements.in
+++ b/requirements.in
@@ -13,4 +13,5 @@ niceware==0.2.1
 psutil==5.7.0
 filenuke==0.0.0
 mimcvdf==1.0.0
-watchdog==0.10.2
\ No newline at end of file
+watchdog==0.10.2
+ujson==2.0.3
diff --git a/requirements.txt b/requirements.txt
index 897b0881..31c9b8ff 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -216,6 +216,15 @@ streamedrequests==1.0.0 \
 toomanyobjs==1.1.0 \
     --hash=sha256:99e27468f9dad19127be9e2fb086b42acd69aed9ad7e63cef74d6e4389be0534 \
     # via -r requirements.in
+ujson==2.0.3 \
+    --hash=sha256:0c23f21e8d2b60efab57bc6ce9d1fb7c4e96f4bfefbf5a6043a3f3309e2a738a \
+    --hash=sha256:2ab88e330405315512afe9276f29a60e9b3439187b273665630a57ed7fe1d936 \
+    --hash=sha256:3d1f4705a4ec1e48ff383a4d92299d8ec25e9a8158bcea619912440948117634 \
+    --hash=sha256:6217c63a36e9b26e9271e686d212397ce7fb04c07d85509dd4e2ed73493320f8 \
+    --hash=sha256:7ae13733d9467d16ccac2f38212cdee841b49ae927085c533425be9076b0bc9d \
+    --hash=sha256:bd2deffc983827510e5145fb66e4cc0f577480c62fe0b4882139f8f7d27ae9a3 \
+    --hash=sha256:c8369ef49169804944e920c427e350182e33756422b69989c55608fc28bebf98 \
+    # via -r requirements.in
 unpaddedbase32==0.2.0 \
     --hash=sha256:4aacee75f8fd6c8cf129842ecba45ca59c11bfb13dae19d86f32b48fa3715403 \
     --hash=sha256:b7b780c31d27d55e66abf6c221216a35690ee8892c2daacff7f2528e229bd9c3 \
diff --git a/src/onionrproofs/subprocesspow.py b/src/onionrproofs/subprocesspow.py
index f3470699..e4852e8b 100755
--- a/src/onionrproofs/subprocesspow.py
+++ b/src/onionrproofs/subprocesspow.py
@@ -1,22 +1,20 @@
 #!/usr/bin/env python3
-"""
-    Onionr - Private P2P Communication
+"""Onionr - Private P2P Communication.
 
-    Multiprocess proof of work
+Multiprocess proof of work
 """
 
 import os
 from multiprocessing import Pipe, Process
 import threading
 import time
-import json
-import secrets
+import onionrproofs
+
+import ujson as json
 
 import logger
-import onionrproofs
 import onionrcrypto as crypto
 from onionrutils import bytesconverter
-from .blocknoncestart import BLOCK_NONCE_START_INT
 
 """
     This program is free software: you can redistribute it and/or modify
@@ -110,11 +108,12 @@ class SubprocessPOW:
 
     def do_pow(self, pipe):
         """find partial hash colision generating nonce for a block"""
-        nonce = -secrets.randbelow(10**10)
+        nonce = 0
         data = self.data
         metadata = self.metadata
         puzzle = self.puzzle
         difficulty = self.difficulty
+
         while True:
             # Break if shutdown received
             if pipe.poll() and pipe.recv() == 'shutdown':
diff --git a/tests/runtime-result.txt b/tests/runtime-result.txt
index 52b64ce6..8dc1d799 100644
--- a/tests/runtime-result.txt
+++ b/tests/runtime-result.txt
@@ -1 +1 @@
-1585619396
\ No newline at end of file
+1585902463
\ No newline at end of file