Binance Holdings Ltd. has tightened requirements for listing new digital tokens, stepping up efforts to bolster investor protections on its platform. Crypto projects seeking to list tokens on Binance must now agree to a significantly longer so-called “cliff period” during which no coins can be sold, set aside more coins for market makers and make a security deposit, said people with knowledge of the matter, who asked not to be identified discussing confidential information. The changes started t...