Julian Fietkau@julian@fietkau.social: @hazelnoot @fedify At the very least, Mastodon and Fedify (and by extension Hollo and Ghost) do. Outside of those I'm very unsure! I've seen @silverpill talk about it a bunch, so maybe Mitra supports it as well.

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Hazelnoot@hazelnoot@void.lgbt (2026-04-07 04:11:30)
Speaking of RFC 9421, which notable fediverse implementations can’t handle it yet? Anyone keeping track?@julian @fedify I’m honestly not aware of any that do support it yet…
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Julian Fietkau@julian@fietkau.social (2026-04-07 04:15:42)
@hazelnoot @fedify At the very least, Mastodon and Fedify (and by extension Hollo and Ghost) do. Outside of those I'm very unsure! I've seen @silverpill talk about it a bunch, so maybe Mitra supports it as well.


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silverpill@silverpill@mitra.social (2026-04-07 06:24:10)
@julian @hazelnoot @fedify Mitra can verify RFC-9421 sigs.

I think all FEP-844e implementations support RFC-9421 in some capacity. The list of known implementations includes:

- Streams / Forte
- ActivityPub for WordPress
- tootik