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by grey-area 4496 days ago
That's what mtgox said too, I believe their figure was 98%:

On average 98% of customer bitcoins are held in cold storage...Offline wallets are generated from an offline system and kept in paper format in three separate locations, using a technology based on raid.

https://bitcointalk.org/index.php?topic=23938.40

http://www.managementtoday.co.uk/bulletin/mtdailybulletin/ar...

But of course, they weren't really in cold storage or offline after all, because somehow they all disappeared...

Not that I mistrust coinbase specifically, but without insurance, audits and regulation (i.e. without a banking license), I'm not sure I'd trust anyone to store significant amounts of money.