A New Fashion: Everyone Wants Their Own Chain Self-built blockchains have become the latest craze in fintech. • Coinbase already has Base. • Robinhood announced its own chain in June; rival eToro is weighing a similar move. Now Stripe and Circle—two of the biggest names in payments and stable-coins—have jumped on the bandwagon. A since-deleted job posting and people familiar with the matter say Stripe is quietly building Tempo, a payments-first blockchain. Hours later, Circle revealed Arc, a ...