I rather doubt if 'Arry is to be relied upon for financial advice. The Guardian reports:
The trouble with these cryptocurrencies is that expert opinion is so divided. In the sceptical camp, you have the likes of Kenneth Rogoff, the former chief economist of the International Monetary Fund; Jamie Dimon, the chief executive of one of the world’s largest banks, JP Morgan; and our own Financial Conduct Authority. In the other camp, there’s Harry Redknapp.
Yes, the football manager who recently departed Birmingham City is the latest celebrity to join the craze. “Proper excited about Mobile Cryptocurrency! I’m in, get involved!” tweeted Redknapp in support of Electroneum, which bills itself as “the first British cryptocurrency.”
Redknapp is free to speculate as he wishes, but the advice here remains the same: if you find yourself tempted to have a flutter on a cryptocurrency, lie down until the feeling goes away.