"I'M GONNA make a $hit t$n of money on August 2nd on the Stox.com ICO." Written in July on Instagram, these words made Floyd Mayweather, a boxer, the first big celebrity to endorse an "initial coin offering", a form of crowdfunding that issues cryptographic coins, or "tokens". Stox, an online prediction market, went on to raise more than $30m, some of which seems to have gone directly into Mr Mayweather's pocket. Other VIPS, including Paris Hilton, a socialite, followed suit and endorsed ICOS. But this source of easy cash may now be drying up: on November 1st America's Securities and Exchange Commission (SEC) warned that such promotions may be unlawful, if celebrities fail to disclose what they receive in return.
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