Coinbase signage during the company's IPO at the Nasdaq MarketSite in New York in 2021.Photographer: Michael Nagle/BloombergCitigroup Inc. and Coinbase Global Inc. are teaming up to provide expanded digital-asset payment capabilities to the bank’s corporate clients, the latest instance of major Wall Street firms looking to the blockchain for innovation after years of warnings from regulators about the risks of the asset class.The collaboration will initially focus on exploring making transferrin...