def get_blockchain():
blockchain = Blockchain()
blockchain_db = Table("blockchain", "number", "nonce", "hash_previous", "hash_current", "data")
for block_db in blockchain_db.getall():
blockchain.add_block(Block(int(block_db.get('number')), int(block_db.get('nonce')), block_db.get('hash_previous'), block_db.get('data')))
return blockchain
def create_chain_from_dump(chain_dump):
generated_blockchain = Blockchain()
generated_blockchain.create_genesis_block()
for idx, block_data in enumerate(chain_dump):
if idx == 0:
continue # skip genesis block
block = Block(block_data["index"], block_data["transactions"],
block_data["timestamp"], block_data["previous_hash"],
block_data["nonce"])
proof = block_data['hash']
added = generated_blockchain.add_block(block, proof)
if not added:
raise Exception("The chain dump is tampered!!")
return generated_blockchain
