The blog post discusses how five fintech companies—Aurora Payments, Fi, Pismo, Form3, and Birchal—across different continents have successfully implemented CockroachDB to overcome challenges related to scalability, availability, and consistency in their payment processing systems. Aurora Payments in the U.S. transitioned from PostgreSQL to CockroachDB to manage a vast amount of private and transactional data, ensuring high availability and redundancy. Fi in India chose CockroachDB for its ability to scale across regions and comply with complex data regulations, supporting their rapidly growing customer base. Pismo, operating in Brazil, uses CockroachDB to modernize its banking platform and expand globally while maintaining regulatory compliance. The UK-based Form3 utilizes CockroachDB for its multi-cloud, API-first platform to ensure continuous operation even if a cloud vendor faces an outage. Lastly, Birchal in Australia adopted CockroachDB for its ability to handle transaction-oriented workloads efficiently, providing a seamless user experience for their equity crowdfunding platform. These companies demonstrate CockroachDB's capability to support fintech operations without sacrificing performance or consistency.