????? When Sidney Zhang flew from Melbourne to San Francisco, hoping to make it big in the tech world of Silicon Valley, his parents thought he was “insane”. Especially when his first cryptocurrency company “went up in flames like a dumpster fire” and when he found himself living on a boat for a few weeks. At one point, due to San Francisco’s rental market costing a fortune, he secretly lived at a co-working space — convincing others he just arrived early and left late. But it has all turned around for Mr Zhang after the company he co-founded became a…