[kpil]

In the context of banks, where there are a limited set of semi-trusted entities and multiple trusted third-parties, I seems that most most solutions to prevent cheating offers is either really similar to a trusted third party solution, or offers no major benefits, but comes with many drawbacks.

In cash transactions, it's hard to beat the speed of a trusted third party with a deposited "float" for ensuring that you can pay at the end of the day - even a bad day where a part defaults.

In securities, there is perhaps some room for a blockchain solution, as the infrastructure is much more complex and underdeveloped - due to the historically gigantic margins.