UAIF seemed to be more of an API with an involvement of a decentralized body, completely far from the blockchain. The blockchain employs the use of a decentralized distributed database in the form of blocks, and that, to me sounds like the synthesis of different cryptographic papers and Satoshi openly admitted that in some of his replies and comments. Should computers and tech were widespread during the heydays of Chaum, Szabo and Dai, we may have seen a working cryptocurrency before bitcoin that is utilized heavily even if it's just confined in the interwebs but sadly, that was not the case.
This was close to the concept of a distributed ledger. Surely, a decentralized secured network of ledgers was not very unique when Satoshi wrote about it, research on the topic was being done thoroughly - but back then the internet was not strong enough to host such a wide scale application, hence these 'intranet' experiments existed.
