Lost Bitcoin Wallet Passwords Make $140 Billion-Worth Of BTC Inaccessible KEY POINTS Some users have reportedly lost the password to their digital wallets Around 20% of existing Bitcoins are considered lost, according to crypto data firm Chainalysis Bitcoin's value is soaring, bringing big returns for crypto investors. But there are a few who are not happy. San Francisco-based investor Stefan Thomas is one of them. Thomas has almost lost the password (which he originally wrote down on a paper) to a hard drive, called IronKey, where he stored the private key to his Bitcoin wallet, which holds 7,002 BTC worth about $140 million. IronKey allows its owners ten attempts to get the right password and if they fail it will encrypt its contents forever. Thomas has so far tried eight times.