fintechs have some inhouse tech but typically involve all kinds of third party systems. Even if you are interacting with these third parties via apis(instead o

fintechs have some inhouse tech but typically involve all kinds of third party systems. Even if you are interacting with these third parties via apis(instead of csv or whatever), you will always need an eventually consistent recon mechanism to make sure both sides agree on what was done. It doesnt have to take days though i agree. The only way around this would be to replace stateful apis with some kind of function that takes a reference to a verifiable ledger, that can mutate that and anyone can inspect themselves to see if the operation has been completed. Oh wait :)