Some analysts have argued that PayPal should be more actively developing blockchaln technology for its payment infrastructure, e.g., by creating a version of its payment system that uses a blockchain to process both user and merchant transactions. Paypai's CTO has said that blockchain technology is not a good t as its platform strategy requires PayPal to function as a trusted central intermediary. Give an argument supporting each of the two views above (i.e., two arguments in total)