(#xrswtvq) @zvava@twtxt.net Yes, the specification defines the first url to be used for hashing. No matter if it points to a different feed or whatever. Just unsubscribe from malicious feeds and you’re done.

Since the first url is used for hashing, it must never change. Otherwise, it will break threading, as you already noticed. If your feed moves and you wanna keep the old messages in the same new feed, you still have to point to the old url location and keep that forever. But you can add more urls. As I said several times in the past, in hindsight, using the first url was a big mistake. It would have been much better, if the last encountered url were used for hashing onwards. This way, feed moves would be relatively straightforward. However, that ship has sailed. Luckily, feeds typically don’t relocate.

(#xrswtvq) @zvava@twtxt.net My clients trusts the first url field it finds. If there is none, it uses the URL that I’m using for fetching the feed.

No validation, no logging.

In practice, I’ve not seen issues with people messing with this field. (What I do see, of course, is broken threads when people do legitimate edits that change the hash.)

I don’t see a way how anyone can impersonate anybody else this way. 🤔 Sure, you could use my URL in your url field, but then what? You will still show up as zvava in my client or, if you also change your nick field, as movq (zvava).

(#xrswtvq) @zvava@twtxt.net

(#abcdefghijkl https://example.com/tw.txt#:~:text=2025-10-01T10:28:00Z), because it can be simply hacked in to clients currently on hashv1 and provides an off-ramp to location-based addressing

I like that property (an off-ramp to location-based addressing), so I think I could live with that approach. ✅

(I’m not sure why we’re using text fragments, though. Wouldn’t that link to the first occurence of 2025-10-01T10:28:00Z? That’s not necessarily correct. And, to be proper URLs that Firefox and Chromium understand, it would also need to be written as 2025%2D10%2D01T10:28:00Z. The dash carries meaning, sadly. I think all this just creates needless complication. How about we just go with https://example.com/tw.txt#2025-10-01T10:28:00Z?)