First things that come to mind reading GP are the existing interbank payment clearing networks: Fedwire, CHIPS, SWIFT, etc. And, on the contrary, SWIFT was hac

First things that come to mind reading GP are the existing interbank payment clearing networks: Fedwire, CHIPS, SWIFT, etc. And, on the contrary, SWIFT was hacked not so long ago: https://en.wikipedia.org/wiki/2015%E2%80%932016_SWIFT_banking_hack https://en.wikipedia.org/wiki/2015%E2%80%932016_SWIFT_bankin...