** U.S.-listed shares of crypto and blockchain companies jump after Federal Reserve chair Jerome Powell's speech increases odds of rate cuts in September

** Traders now put a nearly 90% probability on a rate cut in September, versus about 75% before Powell's remarks

** A rate cut lifts the appeal of risk assets such as crypto, drawing in more retail investors and, in turn, benefiting companies with exposure to the sector

** Crypto exchange Coinbase COIN.O jumps 2.8%, while bitcoin treasury company Strategy MSTR.O rises 3%

** Miners MARA Holdings MARA.O, Riot Platforms RIOT.O and Bitfarms BITF.O up 3.9%, 4.5% and 4.9%, respectively

** Bitcoin BTC= inches up nearly 1%, while ether ETH= surges 4.4%

(Reporting by Niket Nishant in Bengaluru)

((Niket.Nishant@thomsonreuters.com))