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- import hashlib as hasher
- import datetime as date
- class Block:
- def __init__(self, index, timestamp, data, previous_hash):
- self.index = index
- self.timestamp = timestamp
- self.data = data
- self.previous_hash = previous_hash
- self.hash = self.hash_block()
- def hash_block(self):
- sha = hasher.sha256()
- sha.update((str(self.index) +
- str(self.timestamp) +
- str(self.data) +
- str(self.previous_hash)).encode()) #change here
- return sha.hexdigest()
- def create_genesis_block():
- # Manually construct a block with
- # index zero and arbitrary previous hash
- return Block(0, date.datetime.now(), "Genesis Block", "0")
- def next_block(last_block):
- this_index = last_block.index + 1
- this_timestamp = date.datetime.now()
- this_data = "Hey! I'm block " + str(this_index)
- this_hash = last_block.hash
- return Block(this_index, this_timestamp, this_data, this_hash)
- # Create the blockchain and add the genesis block
- blockchain = [create_genesis_block()]
- previous_block = blockchain[0]
- # How many blocks should we add to the chain
- # after the genesis block
- num_of_blocks_to_add = 20
- # Add blocks to the chain
- for i in range(0, num_of_blocks_to_add):
- block_to_add = next_block(previous_block)
- blockchain.append(block_to_add)
- previous_block = block_to_add
- # Tell everyone about it!
- print ("Block #{} has been added to the blockchain!".format(block_to_add.index))
- print ("Hash: {}\n".format(block_to_add.hash))
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