South Korea said on Wednesday it may tax capital gains from cryptocurrency trading as global regulators worried about a bubble, with Australia’s central bank chief warning of a ‘speculative mania” that has seen the digital asset making rip-roaring gains.

As bitcoin futures made their world debut on a U.S. stock exchange this week, policy makers have been forced to contend with cryptocurrencies becoming more of a mainstream play and the need to regulate them.

The world’s biggest and best known cryptocurrency, bitcoin BTC=BTSP, surged past $17,000 to new all-time highs this week, marking an almost dizzying 20-fold rise this year and feeding fears of a bubble.

Australia’s central bank governor Philip Lowe warned on Wednesday the fascination with the assets felt like a “speculative mania.”

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