Crypto stocks gain after bitcoin, ether prices rise
** Shares of cryptocurrency and blockchain-related companies rise premarket, tracking gains in digital assets such as bitcoin and ether** Bitcoin , the world's biggest cryptocurrency, up 2.8% at $87,942.86; Ether up 4.3% at $2,950.32** Crypto exchange Coinbase Global rises 3%; blockchain farm operator Bitfarms up 2.6%** Crypto miners: Riot Platforms and MARA Holdings gain more than 3%; Hut 8 adds 4.8%; Bit Digital up 6.4%** BTC buyer Strategy gains 3.8%** iShares Bitcoin Trust ETF up 4%** As of last close, BTC down 6.1% YTD; ETH down 11.8% YTD