‘Proof of Keys’ is coming, but what is it?

Notable crypto enthusiast Trace Mayer has been recently advocating the importance of a “Proof of Keys” celebration. The event will take place on January 3, 2019.
Proof of Keys event
Trace Mayer is now promoting a crypto ownership awareness event called “Proof of Keys“. In the event, cryptocurrency holders are urged to remove their crypto assets from exchanges and other third parties in an effort to prove solvency.
The idea is that if the exchanges actually hold customers&