Underground vaults, offline servers, and armed guards: this is the Fort Knox of Bitcoin

In July, a bitcoin startup named Xapo announced it was raising $20 million, bringing its total backing to $40 million. It was using this funding for an unusually intense security setup. Xapo tells users that they can feel secure because their bitcoin will be stored in offline servers, scattered across multiple continents, in secret underground vaults, with armed guards, and biometric sensors.

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