Aust bitcoin creator promises more proof

Australian man Craig Wright, who sensationally claimed to be the creator of bitcoin, says he will provide more proof he is behind the digital currency.

Australian Craig Wright, long rumored to be associated with the digital currency Bitcoin, has publicly identified himself as its creator. Source: AAP

Australian businessman Craig Wright says he will provide "extraordinary proof" he is the creator of bitcoin following his controversial announcement.

Mr Wright, 45, told the BBC, The Economist and GQ on Monday he was Satoshi Nakamoto, the pseudonym used by the creator of the digital currency.

His declaration was widely questioned, with computer security experts labelling it a "scam" and The Economist calling on him to further substantiate his claim.

The Brisbane-born entrepreneur responded with a blog post on Tuesday, saying he would move some of the early bitcoin in the coming days to prove he is Mr Nakamoto.

"I will be posting a series of pieces that will lay the foundations for this extraordinary claim, which will include posting independently-verifiable documents and evidence addressing some of the false allegations that have been levelled," Mr Wright wrote.

"I will present what I believe to be "extraordinary proof" and ask only that it be independently validated."

Mr Wright's initial evidence included a message using Mr Nakamoto's digital signature.

Bitcoin's chief scientist Gavin Andresen said he believed Mr Wright had proved his identity "beyond a reasonable doubt".

But the proof was not enough to convince many experts and internet sleuths who moved to debunk the story.

American computer security researcher Dan Kaminsky said the digital signature that Mr Wright used to prove he is Mr Nakamoto showed it was a scam.

"It's like Wright took the final page of a signed contract and stapled it to something else, then proclaimed to the world 'See? I signed it!'," Kaminsky posted on his blog.

Mr Wright said he understood the scepticism about his claim and all he could do was provide as much proof as possible.

"I can prove access to the early keys and I can and will do so by moving bitcoin, but this should be a necessary, but not sufficient, condition for such an extraordinary claim," he wrote.

Mr Nakamoto, who invented bitcoin in 2008, is estimated to be sitting on a fortune of up to $US450 million ($A601 million) worth of the currency.