Hardware wallet maker Ledger has sold more than 7 million devices and now manages about 20 per cent of the world's crypto assets, worth about $400 billion. As bitcoin climbed from $68,000 to $98,000, Ledger's hardware sales quadrupled and its Ledger Live app saw a 3.5-fold surge in transactions. Ledger CEO Pascal Gauthier said the company was expanding from cryptocurrency security into the broader cyber security space. The Security Key app, launched in September, has entered the authentication market, which is expected to reach $40 billion by 2030.