问题详情

Is a decentralized, distributed and public digital ledger that is used to record transactions across many computers so that the record cannot be alterred retroactively without the alteration of all subsequent blocks and the collusion ？of the network().
A.Cloud service
B.Blockchain
C.Internet of things
D.Artificial intellingence请帮忙给出正确答案和分析，谢谢！