** Shares of cryptocurrency and blockchain-related firms rise premarket as bitcoin hits highest levels since early Mar
** Bitcoin BTC=, world's biggest cryptocurrency, up 1.6% to $88,685, while Ether ETH= advances 3.6% to $1,635
** BTC rose nearly 3% on Mon even after U.S. President Donald Trump's renewed tirade against Fed Chair Powell sent stocks into a tailspin
** Crypto exchange Coinbase Global COIN.O up 1%, and BTC compiler Strategy MSTR.O, formerly known as MicroStrategy, up ~2% before the bell
** Retail trading platform Robinhood HOOD.O up >1% premarket
** Crypto miners up: Riot Platforms RIOT.O 2%, Mara Holdings MARA.O 2%, Cleanspark CLSK.O 2.8%, Bit Digital BTBT.O 1%
** ProShares Bitcoin Strategy ETF BITO.P and iShares Bitcoin Trust ETF IBIT.O both rising 1.4% premarket
** BTC has rallied 19% from 2025 low of about $74,446 hit on Apr 7. Still, the cryptocurrency is well shy of record high of about $109,000 it touched in mid-Jan, per LSEG data