Open-source it, publish it somewhere or make it a bittorrent. Using blockchain as a hosting solution feels like a misuse.

distributed public key, and a private-signed hash of the dataset.

How do you know that the dataset is the most up to date version?

Maybe some sort of globally distributed time-stamping mechanism? Oh hey look, it's a blockchain.

Or... the source of record can publish an xml file or something when there's updates to the signed diff... rss. No slow consensus model needed.

If you aren't in an adversarial context with multiple publishers, you don't need blockchain.

> source of record

How is this published? On a single server somewhere? What country would you put it in? A friendly one I hope. Also one that won't block access to other countries that it might have petty disagreements with in the future. It might be a good idea for it to be replicated across a number of servers across the internet. We call those "nodes" in the blockchain space.

> We call those "nodes" in the blockchain space.

Mirrors existed long before blockchain.

Blockchain, the new uber-tech-hammer.. everyone gets nailed.