LONDON/PARIS, March 4 : British and U.S. regulators are divided over how to test blockchain-based versions of financial securities, with Britain pushing for a more cautious approach in talks aimed at boosting crypto collaboration, sources said. The U.S. and Britain announced in September a taskforce for reducing regulation for companies seeking to access each other’s markets and to improve digital asset cooperation. The split shows how financial regulators globally have to contend with a pro-