Alright, guys,
It was just an idea. Thank you for your input!
Happy New 2020.
Cheers from Reggie.

Whichever way, it is possible. But would it lead to a secure online wallet?

I have a crude idea that would need ironing out. But it might allow us to keep a high-ish amount of cryptocurrency in an online wallet and be sure it is secure.

We need a trusted third party. Of course, we trust nobody, but still. What if the leading crypto exchanges added on the role of the trusted third party?

Let's say we want to move an amount of crypto from our online wallet on Binance, and we have set up OKEX as our trusted third party. 1. You ask Binance to move your money. 2. Binance relays the request to OKEX. 3. OKEX contacts you to verify if you really want to transfer x amount of your y crypto? 4. You answer OKEX: yes, that is really me and that is what I want to do. 5. OKEX gives an additional encrypted handshake to Binance and everything is safe and hunky-dory.

I am from Flanders, Belgium where the mother tongue is Dutch.
Vertalingen van het Engels naar het Nederlands voor eender welke inhoud.