Hong Kong/Tokyo — Bitcoin plunged as the cancellation of a technology upgrade prompted some users to switch out of the cryptocurrency, spooking speculators who had profited from a more than 800% surge this year. The 9.5% drop since late Friday extended bitcoin’s slide from a record to about 29%, according to data compiled by Coinmarketcap.com and Bloomberg. Bitcoin cash, a rival cryptocurrency that split from the original bitcoin in August, has jumped nearly 40% since Friday. Bitcoin cash is gaining popularity because of its larger block size, a characteristic that makes transactions cheaper and faster than the original. When a faction of the bitcoin community cancelled plans to increase bitcoin’s block size on Wednesday — a move that would have created another offshoot — some supporters of bigger blocks rallied around bitcoin cash. The resulting volatility has been extreme even by bitcoin’s wild standards and comes amid growing interest in cryptocurrencies among regulators, banks a...

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