whether to investigate before the end of the week. arsenal football club broke advertising rules, a watchdog has ruled, by promoting fan tokens online. the uk s advertising regulator said the adswere misleading as they didn t spell out the risks of investing in cryptocurrencies. let s speak to our correspondent chris vallance. explain to us how arsenal has broken the rules? we should start by saying what fan tokens are, they worked a bit like a club specific cryptocurrency and can be bought and sold using an app. european top league clubs are getting into them as an extra source of income and away to engage with fans. they give them a to purchase stuff in the club shop or give them a decide what song is chosen. but