[jjulius]

What's the difference between that, and offering a piece of music for purchase one time on Bandcamp?

That would be a digitally-provable representation of the music in their Bandcamp profile, and they would get it almost directly from the artist.

Edit: Hell, just for fun, how's that different from EBay?

[dropnerd]

if bandcamp goes out of business, your proof that you bought from the artist disappears when the aws rds database turns off

if you mint an nft, so long as there is some business querying the ethereum blockchain, you can prove your purchase