Has anyone here ever sold a domain name as an NFT?

Building mobile games @ volley // Building https://anything.is/possible

working on receipts.xyz // workout. earn points. /receipts

Oh yeah totally. I imagine it's similar to putting real-world assets on-chain. Basically, have some sort of centralized guarantor?

how do you envision this? All happens off chain so would have to be a lot of trust involved

Check this attempt 

https://opensea.io/assets/ethereum/0x495f947276749ce646f68ac8c248420045cb7b5e/4470382457566506742034697948564087821820981756137048544138956972801549926401

The .art TLD team is working on this https://docs.protocol.art/.art-all-about-ens-mint