It sounds far-fetched, but it’s true. There is a vault in a secret nuclear bunker in the Swiss Alps protecting a significant amount of Bitcoin (BTC). Cointelegraph visited the facility first-hand to see how multiparty computation (MPC) shards stored in bunkers are being used to provide bleeding-edge security to one of the world’s first Bitcoin banks. Every Bitcoiner knows the phrase “not your keys, not your coins,” but you can’t keep hiding your hardware wallet or seed phrase under your mattress forever. With an estimated two million Bitcoin irrevocably lost, how and where you store your BTC r…