You're almost describing the lightning network, which depending on where you get...

Izkata 59 days ago | parent | context | favorite | on: I passionately hate hype, especially the AI hype

You're almost describing the lightning network, which depending on where you get your numbers can handle around 10-40x the transactions per second of Visa or MasterCard, neither of which are above 70k in anything I found with a quick search.

Granted it sounds like the lightning network has other issues.