Block.py

# ***************************************References*************************************************************
# [1] H. Chen, S. A. Asif, J. Park, C.-C. Shen, and M. Bennis, “Robust Blockchained Federated Learning with Model Validation and Proof-of-Stake Inspired Consensus.” arXiv, Jan. 09, 2021. Accessed: Nov. 12, 2022. [Online]. Available: http://arxiv.org/abs/2101.03300
# Github Link: https://github.com/hanglearning/VBFL.git
# [1] H. Zhao, “Exact Decomposition of Quantum Channels for Non-IID Quantum Federated Learning.” arXiv, Sep. 01, 2022. Accessed: Nov. 06, 2022. [Online]. Available: http://arxiv.org/abs/2209.00768
# Github Link: https://github.com/JasonZHM/quantum-fed-infer.git (MIT Licence)
# ***************************************References*************************************************************
# reference - https://developer.ibm.com/technologies/blockchain/tutorials/develop-a-blockchain-application-from-scratch-in-python/

import copy
import json
from hashlib import sha256

class Block:
	def __init__(self, idx, previous_block_hash=None, transactions=None, nonce=0, miner_rsa_pub_key=None, mined_by=None, mining_rewards=None, pow_proof=None, signature=None):
		self._idx = idx
		self._previous_block_hash = previous_block_hash
		self._transactions = transactions
		self._nonce = nonce
		self._miner_rsa_pub_key = miner_rsa_pub_key
		self._mined_by = mined_by
		self._mining_rewards = mining_rewards
		self._pow_proof = pow_proof
		self._signature = signature

	def compute_hash(self, hash_entire_block=False):
		block_content = copy.deepcopy(self.__dict__)
		if not hash_entire_block:
			block_content['_pow_proof'] = None
			block_content['_signature'] = None
			block_content['_mining_rewards'] = None
		return sha256(str(sorted(block_content.items())).encode('utf-8')).hexdigest()

	def remove_signature_for_verification(self):
		self._signature = None

	def set_pow_proof(self, the_hash):
		self._pow_proof = the_hash

	def nonce_increment(self):
		self._nonce += 1

	def return_previous_block_hash(self):
		return self._previous_block_hash

	def return_block_idx(self):
		return self._idx
	
	def return_pow_proof(self):
		return self._pow_proof
	
	def return_miner_rsa_pub_key(self):
		return self._miner_rsa_pub_key

	''' Miner Specific '''
	def set_previous_block_hash(self, hash_to_set):
		self._previous_block_hash = hash_to_set

	def add_verified_transaction(self, transaction):
		self._transactions.append(transaction)

	def set_nonce(self, nonce):
		self._nonce = nonce

	def set_mined_by(self, mined_by):
		self._mined_by = mined_by
	
	def return_mined_by(self):
		return self._mined_by

	def set_signature(self, signature):
		self._signature = signature

	def return_signature(self):
		return self._signature

	def set_mining_rewards(self, mining_rewards):
		self._mining_rewards = mining_rewards

	def return_mining_rewards(self):
		return self._mining_rewards
	
	def return_transactions(self):
		return self._transactions

	def free_tx(self):
		try:
			del self._transactions
		except:
			pass