It may be hedge funds, rather than retail investors, that are driving this autumn’s rally in the price of bitcoin.

And this time round, the institutional investors are buying exchange-traded products as well as the underlying cryptocurrency. A bitcoin ETP managed by Swiss issuer 21Shares is receiving creations — the equivalent of inflows — of as much as $3 million a day. In November last year, it took all month to attract the same amount of new money.