There's a IETF WG working on this[1]. It's been a while since I checked on the progress, so this might not be up-to-date, but it was DNS-based, with a way to ex

There's a IETF WG working on this[1]. It's been a while since I checked on the progress, so this might not be up-to-date, but it was DNS-based, with a way to export to a static file like the PSL (I'd assume in order to avoid the performance impact of browsers having to wait for another DNS query to determine cookie scope, etc.) [1]: https://datatracker.ietf.org/wg/dbound/charter/ https://datatracker.ietf.org/wg/dbound/charter/