Imagine, you transact without a bank as an intermediary or Peer to Peer (P2P). It's certainly faster and cheaper without the number of outgoing costs, is it? This is the advantage of Blockchain's technology in Bitcoin and cryptocurrency.
Blockchain technology is like a cash book that records transactions that occur which then spread to the P2P network. Anyone transacting using Bitcoin or cryptocurrency automatically becomes part of the network and has access to view transactions. so in my opinion Bitcoin will tear down the Bank so why Many central banks in the world Panic