import hashlib
 
class Vblock:
    def __init__(self, data, pbh):
        self.data = data
        self.pbh = pbh
        self.vbh = self.calculate_vbh()
 
    def calculate_vbh(self):
        return hashlib.sha256((self.data + self.pbh).encode()).hexdigest()
 
# 創建Vchain
vblock1 = Vblock("Transaction 1 verified", "0")
vblock2 = Vblock("Transaction 2 verified", vblock1.vbh)
vblock3 = Vblock("Transaction 3 verified", vblock2.vbh)
 
# 驗證Vblock 3的完整性
def verify_vblock(vblock, prev_vblock):
    if vblock.pbh == prev_vblock.vbh:
        print("Verification successful. Vblock", vblock.data, "is intact.")
    else:
        print("Verification failed. Vblock", vblock.data, "may have been tampered.")
 
verify_vblock(vblock3, vblock2)

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