> I would be very surprised if something based on Blockchain or similar software doesn't offer a solution here.
There is, it's a layer-2 on Ethereum called zkSync. It's not totally satisfactory (the company that makes it can steal your money, centralized sequencer, etc), but it's pretty mature and works quite well. To replace Visa you want high throughput and low latency and zk-rollups like zkSync can provide both. (There are other options too, like Starknet, but AFAIK zkSync is the most mature.)
There is, it's a layer-2 on Ethereum called zkSync. It's not totally satisfactory (the company that makes it can steal your money, centralized sequencer, etc), but it's pretty mature and works quite well. To replace Visa you want high throughput and low latency and zk-rollups like zkSync can provide both. (There are other options too, like Starknet, but AFAIK zkSync is the most mature.)