def verify_blockchain_depth(cls) -> bool:
"""深入验证区块链（区块、交易）"""
if not cls.verify_blockchain():
return False
for block in BlockChain.get_instance().get_blocks()[1:]: # 第一个区块不作检查
if not cls.verify_block_depth(block):
return False
return True
def verify_new_transaction(cls, trans: Transaction) -> bool:
"""验证一笔新交易"""
if not cls.verify_transaction(trans):
return False
# 验证输入的有效性
for inp in trans.get_inputs():
if not BlockChain.get_instance().verify_utxo(
inp.block, inp.trans, inp.output):
return False
return True
def is_ok(self) -> bool:
blc = BlockChain.get_instance()
for block in blc.get_blocks():
# 区块的时间戳肯定比区块链要后
if block.get_timestap() < blc.get_start_time():
return False
# 区块的时间戳肯定比现在前
if block.get_timestap() > time.localtime():
return False
return True
def is_ok(self) -> bool:
address_list = [key.get_address() for key in self.trans.get_pub_keys()]
# 签名必须有效
if not self.trans.verify_transaction():
return False
# 每一个输入都为本人的utxo
for inp in self.trans.get_inputs():
outp = BlockChain.get_instance().input_to_output(inp)
if outp.address not in address_list:
return False
return True
def is_ok(self) -> bool:
pre_hash = FIREST_BLOCK_PREHASH
for i, block in enumerate(BlockChain.get_instance().get_blocks()):
# 索引值index应合法
if block.get_index() != i + 1:
return False
# pre_hash值应为上一个区块
if pre_hash != block.get_prehash():
return False
pre_hash = block.get_hash()
return True
def verify_new_block(cls, block: Block) -> bool:
"""验证一个新块"""
if not cls.verify_block_depth(block):
return False
# pre_hash的值要正确
if block.get_prehash() != BlockChain.get_instance().get_top_block(
).get_hash():
return False
# 验证每笔交易的有效性
inputs = []
for trans in block.get_user_transactions():
if not cls.verify_new_transaction(trans):
return False
inputs.extend(trans.get_inputs())
# 不同的交易不能有相同的输入
if len(set(inputs)) != len(inputs):
return False
return True
def verify_block_depth(cls, block: Block) -> bool:
"""深入验证区块（包括区块中的交易）"""
if not cls.verify_block(block):
return False
# 验证用户的交易
for trans in block.get_user_transactions():
if not cls.verify_transaction(trans):
return False
# 验证第一笔交易
trans = block.get_head_transaction()
# 计算交易费
fee = BlockChain.get_instance().compute_block_fee(block)
# 计算矿工奖励
mini_fee = trans.compute_outputs_btcs() - fee
# 计算这个区块时的矿工奖励
mini_btcs = block.get_now_ming_btcs()
# 验证矿工奖励合法性
if mini_fee != mini_btcs:
return False
return True
from key import UserKey
from chain import Btc, TransOutput, TransInput, Transaction, Block, BlockChain
from config import MINING_BTCS
from verify import Verify
if __name__ == "__main__":
print(BlockChain.__qualname__, BlockChain.get_instance.__qualname__)
# 创建区块链
bc = BlockChain.get_instance()
print(bc.get_start_time())
# 初始的两个用户
key1 = UserKey()
key2 = UserKey()
# 初始区块的创币交易（只有输出，没有输入）
t1 = Transaction()
t1.add_output(TransOutput(Btc("5000"), key1.get_address()))
t1.add_output(TransOutput(Btc("5000"), key2.get_address()))
# 创世区块
b1 = Block()
b1.add_transaction(t1)
# 添加矿工奖励交易
mt1 = Transaction()
mt1.add_output(TransOutput(Btc(MINING_BTCS), key1.get_address()))
b1.set_head_transaction(mt1)
b1.set_index(1)
# 挖矿
b1.find_randnum()
# 添加区块
bc.add_block(b1)
# key1向key2转账
t2 = Transaction()
def is_ok(self) -> bool:
# 交易费必须大于0
blc = BlockChain.get_instance()
return blc.compute_transaction_fee(self.trans) > Btc("0")
def __import_blc_from_db(self) -> None:
"""从sqlite数据库导入区块链"""
for block in self.sqlite_driver.get_blocks():
BlockChain.get_instance().add_block(block)
def __blc(self) -> BlockChain:
return BlockChain.get_instance()
