Major Swiss bank UBS is testing blockchain technology by implementing its UBS Key4 Gold service, which enables fractional trading of physical gold, on the Ethereum layer-2 network zkSync. This proof-of-concept demonstrates the growing trend of traditional financial institutions to utilize blockchain for more efficient and secure transactions, especially with zero-knowledge proofs (ZKPs) to improve data protection. UBS is not alone; other major banks are also exploring blockchain applications. The successful test transaction points to a possible wider integration of layer 2 solutions into financial services. This move underscores the increasing convergence of traditional financial institutions and blockchain technologies.