def create_chain_from_dump(chain_dump):
bc = Blockchain()
for idx, block_data in enumerate(chain_dump):
block = Block(transactions=block_data["transactions"],
timestamp=block_data["timestamp"],
previous_hash=block_data["previous_hash"])
block.block_hash = block_data["block_hash"]
proof = block_data["block_hash"]
if idx > 0:
added = bc.add_block(block, proof)
if not added:
raise Exception("The chain dump is tampered!")
else: # the block is a genesis block, no verification needed
bc.chain.append(block) #TODO are you sure this makes sense?
return bc
def verify_and_add_block():
"""Endpoint to add a block mined by someone else to the node's chain. The node first verifies the block and then
adds it to the chain."""
print("New block received from network...", sys.stdout)
block_data = request.get_json(force=True)
print(block_data, sys.stdout)
block = Block(transactions=block_data["transactions"],
timestamp=block_data["timestamp"],
previous_hash=block_data["previous_hash"])
block.block_hash = block_data["block_hash"]
#TODO why are we generating the block hash once and then redefining it? Stupid.
proof = block_data['block_hash']
added = blockchain.add_block(block, proof)
if not added:
print("block discarded by node", sys.stdout)
return "The block was discarded by the node", 400
print("block added to chain", sys.stdout)
return "Block added to the chain", 201