If two people can create a persistent public record of their demonstrably authentic exchange agreement then it may be good enough to serve as an interim financial transaction in place of an actual funds transfer between bank accounts – the balancing funds transfer occurring at a later date (similarly published).

A bit like a publicly visible cheque. Collect ’em all up and then publish a balancing cheque.

If the cheques are good enough who needs to waste time transferring funds all the time?