Blockchain isn’t only a side project for the world’s biggest banks and exchanges. The technology that underpins crypto is big business — with hundreds of employees focused on building systems that will help overhaul traditional finance. 

Just as crypto has entered the mainstream of finance through the nuts and bolts of the financial system — rather than trading desks betting on the latest coins — banks have ploughed into the digital assets world by focusing on the plumbing of the sector.