By Martin Coulter LONDON (Reuters) – Tony Fadell, a well-known Silicon Valley executive known as the father of the iPod, on Tuesday unveiled his latest project – a hardware wallet used to store cryptocurrency offline. Fadell, 53, spent almost a decade at Apple under Steve Jobs, where he oversaw the design of the portable music player, and later helped create the company’s best-known device, the iPhone. After quitting Apple in 2008, he launched Nest Labs, a smart home-devices company. Nest was later acquired by tech giant Google for $3.2 billion. Now Fadell has teamed up with Ledger, the French…
