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Hot storage is a wallet that is accessible online, eg, n wallet used by the "bank" to transfer coins from their own account to a customer that wants to be paid out.

A cold wallet is one where the keys are kept offline and not plugged into anything, eg, a printout, or a USB key.



So, is keeping a majority of bitcoins (>98%) bitcoins in cold storage the only way to keep them safe?


If they secured their servers (from hacking), they could theoretically leave everything in hot storage (although it's not necessary for normal operations as others have stated).




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