** Shares of crypto and blockchain-related companies down in premarket trading as bitcoin falls
** Bitcoin BTC=, world's biggest cryptocurrency, falls nearly 1%, while Ether ETH= marginally up 0.3%
** Crypto exchange Coinbase Global COIN.O falls 2.7%, U.S.-listed shares of blockchain farm operator Bitfarms Ltd BITF.O down 3.4%
** Crypto miners Riot Platforms Inc RIOT.O, Hut 8 Mining HUT.O and Marathon Digital MARA.O down between 2.6% and 4%
(Reporting by Jaiveer Singh Shekhawat in Bengaluru)
((JaiveerSingh.Shekhawat@thomsonreuters.com;))