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Re:Tokyo-based cryptocurrency exchange hacked, losing $530M:... by cocktailpeanuts on Friday January 26, 2018 @05:17PM (#16243356)
It's called "multisig wallet", and a lot of reputable online wallets implement this.

Instead of doing what you suggested, normally it's 2 of 3 where it's your cold wallet, your hot wallet, and the online wallet provider.

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