Ether, the world's second-largest cryptocurrency, hit an all-time high on Wednesday, catching up with bitcoin's rally and riding on news of wider blockchain adoption.The ether token, which underpins the ethereum blockchain network, rose as high as US$4,670.81, as of 3.15pm EDT.The cryptocurrency extended its gains, breaching the previous day's US$4,600 level, after the US Federal Reserve announced a tapering of its asset purchases, but held to its belief that high inflation would prove "transitory" and likely not require a fast rise in interest rates.Ether is up more than 10 per cent this week.In the days since bitcoin, the world's largest cryptocurrency, hit its record high of US$67,016.5 on Oct 20, other tokens on the base layer of