At the beginning of May, it seemed that a great mystery had been solved.
An Australian academic and entrepreneur, Craig Wright, identified himself as Satoshi Nakamoto, the creator of the crypto-currency Bitcoin.
But, over the following days, the proof he offered was torn apart, not just by angry people on the Bitcoin forums but by a number of authorities on cryptography.
After first promising more evidence, Dr Wright then wrote a blog saying he did not have the strength to continue and retired from public view.
Nakamoto’s true identity appeared as opaque as ever – the Australian