Bitcoin, Ddos, Bitmatrix, Attack Vectors, Cryptocurrency.
https://www.apriorit.com/dev-blog/578-blockchain-attack-vectors [1] https://cointelegraph.com/news/report-shows-cryptocurrency-exchanges-most-common-ddos-victims-worldwide [2] https://en.wikipedia.org/wiki/Mt._Gox [3] https://www.welivesecurity.com/2017/12/06/cryptocurrency-bitfinex-ddos-attacks/