hi bitfinex..
i know once your hot wallet gets empty, u guys will refill it up with your cold wallet... do u guys have only 1 cold wallet or many? from what i know once a cold wallet is activated online there is risk! and then the cold wallet becomes a hot wallet too
https://www.youtube.com/watch?v=wzwWIDIVSTo I don't think you do really understand how Bitcoin works or what hot/cold wallet means... the only thing that changes after the first transaction out of a cold wallet is that the public key of that address is now known. As long as you trust in ECDSA, this is not really an issue. Also it is easy to see (if you look at where the transactions to the hot wallet come from) if they use a single address or several ones.
He does have a point, that when you import your formerly offline/cold wallet in an online system, that wallet isn't cold anymore.
Of course you can use a better system, like Armory for example, where the signing of the transaction happens offline too.
Yes, I like the idea to have "one time" offline addresses. Create a ton of those offline, fill them over the time, and transfer funds to the hot wallet when needed. Without reusing such a spent cold address later.
With the way BitFinex handles things, I expect them to have a sophisticated and very secure way of transferring to and from a cold wallet.
Ente