blockchain.py inovation

blockchain.py

@@ -58,7 +58,9 @@ def valid_chain(self, chain):
  # Check that the Proof of Work is correct
  if not self.valid_proof(last_block['proof'], block['proof'], last_block_hash):
  return False
-
+ #Check the maths
+ if not self.valid_maths(last_block['math'],current_index)
+ return False
  last_block = block
  current_index += 1
 
@@ -112,6 +114,7 @@ def new_block(self, proof, previous_hash):
  'timestamp': time(),
  'transactions': self.current_transactions,
  'proof': proof,
+ 'math': self.math(len(self.chain)),
  'previous_hash': previous_hash or self.hash(self.chain[-1]),
  }
 
@@ -154,25 +157,38 @@ def hash(block):
  block_string = json.dumps(block, sort_keys=True).encode()
  return hashlib.sha256(block_string).hexdigest()
 
+
  def proof_of_work(self, last_block):
- """
- Simple Proof of Work Algorithm:
 
- - Find a number p' such that hash(pp') contains leading 4 zeroes
+ """ Simple Proof of Work Algorithm:
+
+ - Find a number p' such that hash(pp') contains leading 4 zeroes
+
  - Where p is the previous proof, and p' is the new proof
- 
+
  :param last_block: <dict> last Block
+
  :return: <int>
- """
 
+ """ last_proof = last_block['proof'] last_hash = self.hash(last_block)
  last_proof = last_block['proof']
+
  last_hash = self.hash(last_block)
 
  proof = 0
+
  while self.valid_proof(last_proof, proof, last_hash) is False:
+
  proof += 1
 
  return proof
+
+
+
+
+
+
+
 
  @staticmethod
  def valid_proof(last_proof, proof, last_hash):
@@ -189,8 +205,12 @@ def valid_proof(last_proof, proof, last_hash):
  guess = f'{last_proof}{proof}{last_hash}'.encode()
  guess_hash = hashlib.sha256(guess).hexdigest()
  return guess_hash[:4] == "0000"
-
-
+ def valid_maths(math, index):
+ if math!=math(index):
+ return False
+ return True
+ def math(index):
+ return True 
 # Instantiate the Node
 app = Flask(__name__)
 
@@ -206,6 +226,7 @@ def mine():
  # We run the proof of work algorithm to get the next proof...
  last_block = blockchain.last_block
  proof = blockchain.proof_of_work(last_block)
+ math = blockchain.math(len(blockchain.chain))
 
  # We must receive a reward for finding the proof.
  # The sender is "0" to signify that this node has mined a new coin.
@@ -224,6 +245,7 @@ def mine():
  'index': block['index'],
  'transactions': block['transactions'],
  'proof': block['proof'],
+ 'math': math,
  'previous_hash': block['previous_hash'],
  }
  return jsonify(response), 200