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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: Compose a basic blockchain system in Python. ### Input: ### Output: import hashlib import json # We will use SHA256 as our hashing function def sha256(data): hash_function = hashlib.sha256() hash_function.update(data.encode('utf-8')) return hash_function.hexdigest() # Create a class for each block 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 = sha256(f'{self.index}{self.timestamp}{self.data}{self.previous_hash}') # Create a class for the blockchain class Blockchain: def __init__(self): self.chain = [] def add_block(self, data): previous_hash = self.chain[-1].hash if len(self.chain) > 0 else None block = Block(len(self.chain), data['timestamp'], data['data'], previous_hash) self.chain.append(block) # This method will return the entire blockchain in JSON format def get_chain(self): return json.dumps([b.__dict__ for b in self.chain], indent=2)

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Source

Hugging Face

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