Tempo, a payment-focused blockchain incubated by Stripe and cryptocurrency venture firm Paradigm, launched its mainnet and introduced an open standard for machine payments Wednesday (March 18).By completing this form, you agree to receive marketing communications from PYMNTS and to the sharing of your information with our sponsor, if applicable, in accordance with our Privacy Policy and Terms and Conditions .Complete the form to unlock this article and enjoy unlimited free access to all PYMNTS content — no ...