http://dnn5zpcvdq775kci64evns3vo767av3xinmu5hnsnftqb6j5bffm7dad.onion/the-history-of-privacy-coins-their-rise-their-adoptions-their-exploits-and-their-downfalls-11
In 2020, CipherTrace filed two patents for tracing Monero transactions, and other companies were awarded to develop Monero tracing tools not long after. In 2016, Zcash was forked from Bitcoin by a team of scientists who wanted a currency similar to Bitcoin but with additional features, mostly pertaining to security, privacy, and anonymity.