ascii error and genesis block repeating fixed

blockchain.py

@@ -1,11 +1,10 @@
+# -*- coding: utf-8 -*-
 import hashlib
 import json
 from textwrap import dedent
 from time import time
 from uuid import uuid4
 
-
-
 class Blockchain(object):
 
     def __init__(self):
@@ -14,7 +13,7 @@ def __init__(self):
 
     # Create the genesis block
         genesis_block = self.new_block(previous_hash=1, proof=100)
-        self.chain.append(genesis_block)
+        #self.chain.append(genesis_block)
 
     def new_block(self, proof, previous_hash=None):
         block = {
@@ -56,7 +55,7 @@ def hash(block):
     @staticmethod # Hashing algo section
     def valid_proof(last_proof, proof):
 
-        guess = f'{last_proof}{proof}'.encode()
+        guess = (str(last_proof)+str(proof)).encode()
         guess_hash = hashlib.sha256(guess).hexdigest()
         return guess_hash[:2] == "ff"
 
@@ -72,20 +71,19 @@ def proof_of_work(last_proof):
 
         proof = 0
         while True:
-            guess = f'{last_proof}{proof}'.encode()
+            guess = (str(last_proof)+str(proof)).encode()
             guess_hash = hashlib.sha256(guess).hexdigest()
-            if guess_hash[:2] == "ff":
+            if guess_hash[:2] == "00":
                 break
 
             proof += 1
 
-        print(dedent(f'''
+        print(dedent('''
             New Proof found!
-
-             New Proof: {proof}
+            New Proof: {proof}
             Last Proof: {last_proof}
-                  Hash: {guess_hash}
-        '''))
+            Hash: {guess_hash}
+		'''))
         return proof