Hi,
Every exchange adding a new btc, eth, token address on the exchange website.
I think they need some private key to set the transaction on this websites.
So is this private key stored in a normal database?
And is this safe?
There are definitely a lot of safety precautions these exchanges take in order to secure everyone's bitcoins, eths, and tokens. They would be immediately shutdown if they didn't, anyway. But I personally would pick the ones who are already known in the internet and not some shady exchange that no one stores on.