LendIt Fintech's weekly news show covering the top stories in fintech.This week's list of top stories include:Fintech Brex bets big on software, lands DoorDash as a customerCircle Raises $400M as BlackRock Explores USDCLarry Fink Says BlackRock Is Studying CryptocurrenciesMajor US Clearing House Experiments with CBDC for Real-Time SettlementsJustin Bieber, Gwyneth Paltrow and Ashton Kutcher are among dozens of celebrity investors piling into crypto startup MoonPayStep to add stock, crypto inv...