[jude-]

You might want to take a look at Blockstack (https://blockstack.org/). It does exactly this on top of the Bitcoin blockchain. You resolve a globally-unique name to a DNS zone file, which has URI resource records to off-chain data on one or more external storage systems.

Disclaimer: I'm one of its creators.

[tyingq]

Only on HN. I describe an unusual idea in fairly vague terms, and it turns out it exists. And one of the creators clues me in.

Thank you, and I will check it out.