After hackers stole a record $6.3 billion from Binance, cryptocurrency exchanges are tightening security measures and seeking to speed up information sharing across the industry. Coinbase said it had adjusted its system for storing cryptocurrency keys offline as a precaution; Kraken said it was reviewing security incidents across the industry to learn from them. Binance suspended withdrawals after Thursday’s attack and pledged to cover the losses with company funds. Analysts attributed the attack to North Korea, which typically denies involvement in cryptocurrency theft; its delegation in Geneva did not respond to a request for comment. Industry executives said they believed Binance could absorb the losses without triggering broader financial repercussions.