John Spurlock on Nostr: npub1tmchw…czavv npub1n7chn…5qf7l you can also dynamically tack on a _from query ...

npub1tmchw54cwn6sq7qxq3ym5npspmd29j2t6pw8pchm3ta7c80w63qspczavv (npub1tmc…zavv) npub1n7chn85c3d8m0h6stl52pwyls4q2vjl6mtgzn9c3kll5vnpz597sq5qf7l (npub1n7c…qf7l) you can also dynamically tack on a _from query param to each enclosure url based on the user agent fetching the rss feed itself, like what npub1jtm4dxvu3ccgk60wvvt0uw9j9vz7nuc80f7agrv0vgkkushxk5zq0rrxtn (npub1jtm…rxtn) does

This can give you a clue, assuming whatever app this is sets an identifiable ua to fetch the feeds