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Below is an instruction that describes a task. Write a respo...

The prompt

Below is an instruction that describes a task. Write a response that appropriately completes the request. ### Instruction: Build a simple blockchain system in Python. ### Input: Not applicable ### Output: import hashlib import json # Define the Block class 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() # Create the hash of the block contents def hash_block(self): sha = hashlib.sha256() sha.update((str(self.index) + str(self.timestamp) + str(self.data) + str(self.previous_hash)).encode('utf-8')) return sha.hexdigest() # Create the blockchain def create_blockchain(): blockchain = [create_genesis_block()] previous_block = blockchain[0] # Add blocks for each item in the list of transactions for i in range(1, len(blockchain_transactions)): block_to_add = next_block(previous_block, blockchain_transactions[i]) blockchain.append(block_to_add) previous_block = block_to_add # Print the blockchain def print_blockchain(): for block in blockchain: block_index = str(block.index) block_timestamp = str(block.timestamp) block_data = str(block.data) block_hash = block.hash

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Source

Hugging Face

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