Hardware wallet. I don’t want to replace the current banking system with a new centralized one. We now have decentralized exchanges, the only think we need exchanges for it’s just really to cash in and cash out. And eventually we will not even need that, just deposit on a decentralized service and cash out using it too. At that moment centralized exchanges can pretty much die out. This would be the perfect situation.

Look up hardware wallet. Or just a regular app wallet for BTC

Hardware wallet. Nothing else is truly secure