Bitcoin briefly crossed through the $17,000 (£12,615) mark in volatile Asian trading, extending its record-breaking run.
The cryptocurrency has soared about 70% this week according to Coindesk.com, despite fresh warnings of a dangerous bubble.
Its dramatic rise has been likened to a "charging train with no brakes".
As concerns mount, an industry group has warned plans to start bitcoin futures trading were "rushed through".
In a choppy Asian session, the digital currency breached new highs before falling back to about $16,000.
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