I hadn't seen that before. It is associating a sequence of keys with the same identity leveraging a bitcoin wallet identity. And it piggybacks on bitcoin's blockchain for distribution.

But you could make that same association using a master key (in the place of a bitcoin wallet key), and piggybacking on a signed DHT record that specifies your subkeys and/or IP address(es) (in place of the inscription).

There is more than one way to skin a cat.