Updates
** Shares of cryptocurrency and blockchain-related companies advance as bitcoin BTC= hits more than three-week high
** The world's biggest cryptocurrency gains 5.7% to $71,902.9, while ether ETH= rises 6% to $2,085.9
** Cryptocurrency exchange Kraken's banking unit gains access to the U.S. Federal Reserve's payments system, underscoring the industry's growing foothold in mainstream finance
** Crypto exchange Coinbase Global COIN.O rises 9.5%, while blockchain farm operator Bitfarms BITF.O adds 7.8%
** Crypto miners: MARA Holdings MARA.O, Riot Platforms RIOT.O, and Bit Digital BTBT.O gain between 2.9% and 5.4%
** BTC hoarder Strategy MSTR.O advances 8%, while ether hoarder Bitmine Immersion Technologies BMNR.A gains 6.6%
** Shares of retail trading platform Robinhood HOOD.O, which offers trading in crypto tokens, up 6.4%
** ProShares Bitcoin Strategy ETF BITO.P adds 5.3%, iShares Bitcoin Trust ETF IBIT.O up 5.1%
** Stablecoin issuer Circle CRCL.N and crypto-exchange Bullish BLSH.N also climbed 3.7% and 4.4%, respectively
** BTC down more than 43% from its all-time high in October amid ETF outflows and investors unwinding leveraged positions
(Reporting by Shashwat Chauhan in Bengaluru)
((Shashwat.Chauhan@thomsonreuters.com))