Crypto shares down on bitcoin weakness

** Shares of cryptocurrency and blockchain-related companies down as Bitcoin slides

** Bitcoin BTC=, the world's biggest cryptocurrency, down 1.9%

** Crypto exchange Coinbase Global COIN falls ~3.3%

** Crypto miners Riot Platforms Inc RIOT and Hut 8 Mining HUT and Marathon Digital MARA down between ~4.2% and ~6.1%