def _try_to_mine(self):
fee = float(BankSettings.objects.all()[0].fee)
valid_transactions = []
for tid, not_mined_transaction in self.shell.blockchain.not_mined_transactions.items():
if (len(valid_transactions) < self.shell.block_size - 1 and
not_mined_transaction.is_valid(self.shell.blockchain.all_utxos,
self.shell.blockchain.minimum_transaction, fee)):
valid_transactions.append(not_mined_transaction)
if len(valid_transactions) < self.shell.block_size - 1:
return
block = Block(self.shell.blockchain.last_block_hash())
value = float(BankSettings.objects.all()[0].reward) + fee * (self.shell.block_size - 1)
coinbase = Transaction('', self.bank.wallet.get_keys()[0], value=value, inputs=[])
block.add_transaction(transaction=coinbase,
all_utxos=self.shell.blockchain.all_utxos,
minimum_transaction=self.shell.blockchain.minimum_transaction,
fee=fee, should_check=True, is_coinbase=True)
self.shell.blockchain.append_transaction(coinbase)
for valid_transaction in valid_transactions:
block.add_transaction(valid_transaction, self.shell.blockchain.all_utxos,
self.shell.blockchain.minimum_transaction,
fee=fee, should_check=True)
block.mine(BankSettings.objects.all()[0].difficulty)
print('block mined: {}.'.format(block.calculate_hash()))
self.shell.blockchain.append_block(block)
def generate_block():
index = request.form['index']
content = request.form['content']
previous = request.form['previous']
transaction = Transaction(satoshi.private_key, satoshi.public_key, str(content))
block = Block(int(index), [transaction], previous, 0)
block.timestamp = datetime.datetime(2009, 1, 10, 12, 00)
transaction.timestamp = datetime.datetime(2009, 1, 10, 12, 00)
response = {'hash': block.calculate_hash() }
return jsonify(response), 200
def generate_genesis_block():
b = Block(index=0, prev_hash="", validator=nodes.nodes[0].address)
b.calculate_hash()
blockchain.add_block(b)
