(Bloomberg) -- The Sandbox, a platform that allows users to trade and monetize virtual assets in the Ethereum blockchain, is considering raising fresh funds at a valuation of more than $4 billion, according to people familiar with the matter.Most Read from BloombergUkraine Latest: Zelenskiy Says Top U.S. Officials to Visit KyivUkraine Latest: Blinken, Austin in Kyiv for Talks With ZelenskiyDisney’s $578 Million Tax Break Left Untouched in DeSantis FeudMacron Beats Le Pen to Win Second Term as Fr