Hargreaves Lansdown, the U.K.s largest retail investment platform, has started offering nine Bitcoin and Ether exchange-traded notes (ETNs), marking a significant change in its approach to cryptocurrency investments. The Bristol-based investment firm, which serves around two million investors and oversees more than $200 billion in assets, announced Thursday that its platform now provides access to crypto ETNs from major asset managers including BlackRocks iShares, CoinShares, WisdomTree, 21Shares, Invesco and Bitwise.