There used to be lots of interest by fintech companies in using private blockchains to secure trading of derivatives and such. I got the impression it was seen

There used to be lots of interest by fintech companies in using private blockchains to secure trading of derivatives and such. I got the impression it was seen as a way to keep exchanges private (which means less transparency and less ability to regulate them). Not sure if anything came of it, it may be in use but how would anyone know? Though the idea was to use it for verifiable transfers of things of value it wasn't really a cryptocurrency, it focused more on the unforgeable ledger aspect.