Coinbase reveals how it once guarded cold storage keys with Faraday cages

Secret San Francisco locations, coin tosses, and destroyed laptops were all part of the exchange's early key generation process Coinbase once generated the keys to its cold storage inside Faraday-caged tents, set up at secret locations around San Francisco. Start with the Faraday cage. Think of it as a mesh enclosure that stops electromagnetic signals from getting in or out. Electronics leak faint signals while they run. In theory, a well-equipped attacker could capture those emissions and reconstruct sensitive data. Security researchers call these electromagnetic side-channel attacks. Coinbase’s answer was to wrap the whole key generation process in a shield.

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