if you mean the private key then yes, he just need to import it to his wallet.dat to spend all the btc related to it
why doon't you just run the hot wallet on a separate machine, with isolated network? and another want to manage the trasaction if you need to surf the internet
Thank you. I understand now.
The answer is I can use one hot wallet. Because I will encrypt the wallet, no one knows the private key.
Yes, I need Internet. I am lazy to use the cold wallet. I think the best design for bitcoin trading platform that is use the hot wallet, and, only use hot wallet can do all things automatically.