1.python搭建區塊鏈資料結構
import json
import hashlib
from time import time
class BlockChain(object):
def __init__(self):
self.blockchain = []
self.current_transactions =[]
self.new_block()
def __str__(self): #java to string
return f'blockchain:{self.blockchain}'
def new_block(self):
block ={
'index':len(self.blockchain),
'timestramp':time(),
'transaction':self.current_transactions,
'nonce':-1,
'pre_hash':None if len(self.blockchain) == 0 else self.get_block_hash(self.blockchain[-1])
}
hash = None
while not self.valid_proot(hash,4):
block['nonce'] = block['nonce'] + 1
hash =self.get_block_hash(block)
# 把當前區塊添加在區塊鏈中
self.blockchain.append(block)
self.current_transactions =[] #空串列
return block
def get_block_hash(self, block):
block_str = json.dumps(block, sort_keys=True).encode('UTF-8')
return hashlib.sha256(block_str).hexdigest()
def new_tarnsaction(self,sender,receive,amount):
self.current_transactions.append({
'sender':sender,
'receive':receive,
'amount':amount
})
def valid_proot(self,hash,difficulty):
if hash == None or hash[:difficulty] != '0000':
return False
else:
return True
if __name__ == '__main__':
bc =BlockChain()
print(bc.blockchain)
for i in range(3):
bc.new_block()
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標籤：區塊鏈
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