X15 is based on X11 and is similar to X13, but instead of using eleven hash functions, it utilises fifteen different hash functions. This makes is highly resistant to attacks. If the attackers hack one of the fifteen hash functions, the developers improve that specific function to make it more resistant. In order for someone to hack the entire system, you would have to pass through all fifteen functions, which means it is almost impossible.
Currently, we list 8 cryptocurrencies for the X15 algorithm.