If you don't know about BlockCAT already, I just changed your life
BlockCAT is the first blockchain company that wants to come up with a feature that makes it possible to retrieve tokens sent to a wrong address (think human errors, exchange errors, hacks!).
On top of that, they just started a partnership with Attention Network, who will give BlockCAT a big boost marketing wise.
I have not even started about the core platform and fundamentals of the smart contract giant BlockCAT ...
https://blockcat.io for more.