London-based Callsign has landed $35m in a series A round of funding led by Spotify backer Accel and PTB Ventures a New York-based early-stage investment firm specialising in digital identity.
London-based Callsign has landed $35m in a series A round of funding led by Spotify backer Accel and PTB Ventures a New York-based early-stage investment firm specialising in digital identity.