Crypto stocks slide on bitcoin weakness

** Shares of crypto and blockchain-related companies down in premarket trading as bitcoin falls** Bitcoin , world's biggest cryptocurrency, falls nearly 1%, while Ether marginally up 0.3%** Crypto exchange Coinbase Global falls 2.7%, U.S.-listed shares of blockchain farm operator Bitfarms Ltd down 3.4% ** Crypto miners Riot Platforms Inc , Hut 8 Mining and Marathon Digital down between 2.6% and 4%