[Amasuriel]

Because most of the reasons modern settlement is T+2 and cross jurisdiction trading is extremely complex is about regulations in those jurisdictions and various forms of counter party risk mitigation.

Crypto currencies and equities largely avoid this by not enforcing or following many of the regulations that banks and brokerages need to follow for similar financial instruments.

So unfortunately if you understand how settlement happens today in detail, you will probably come to the conclusion that once crypto versions of these assets are regulated in an identical fashion, settlement will look much as it does today, just using a different technology to record events.