the IRCv3 spec name you're looking for is "filehost":
https://ircv3.net/wg#:~:text=FILEHOST (the reference to 562)
https://codeberg.org/emersion/soju/src/branch/master/doc/ext/filehost.md (the earlier draft spec)
https://github.com/ircv3/ircv3-specifications/pull/562/changes (the draft spec proposal, with associated discussion in the commentary on the pull request)
https://codeberg.org/whitequark/ircv3-filehost-server (a sample implementation, functional and in use)
https://github.com/ergochat/ergo/releases/tag/v2.19.0#:~:text=authtoken (ergo IRCd release 2.19.0 adding authtoken support, opening the door to integrating with the above implementation)
Ben Zanin
npub12r…wqh4d
2026-07-29 13:19:42 UTC
in reply to nevent1q…aqm6
Author Public Key
npub12r057c0mkenl95y75a2hufpyuv8e7we9vqy2kjnk2z26rhun7u2sawqh4dSeen on
wss://relay.momostr.pinkPublished at
2026-07-29 13:19:42 UTCEvent JSON
{
"id": "01f40fbff0acd7359d55ab532d7dff8ef91fad844308e05a8a1a097decdc77c9",
"pubkey": "50df4f61fbb667f2d09ea7557e2424e30f9f3b256008ab4a765095a1df93f715",
"created_at": 1785331182,
"kind": 1,
"tags": [
[
"e",
"f4fa191ac56a017c9f164221c2128fd41f847f64ed10d5eeef5cf9656a89cf85",
"",
"root",
"07723a38947cdf41f88fd8fe2c2f87c5f635cc2e2db35ae065d07e1b762d7f6a"
],
[
"proxy",
"https://mastodon.social/@gnomon/117003464352789821",
"web"
],
[
"p",
"07723a38947cdf41f88fd8fe2c2f87c5f635cc2e2db35ae065d07e1b762d7f6a"
],
[
"proxy",
"https://mastodon.social/users/gnomon/statuses/117003464352789821",
"activitypub"
],
[
"L",
"pink.momostr"
],
[
"l",
"pink.momostr.activitypub:https://mastodon.social/users/gnomon/statuses/117003464352789821",
"pink.momostr"
],
[
"-"
]
],
"content": "the IRCv3 spec name you're looking for is \"filehost\":\n\nhttps://ircv3.net/wg#:~:text=FILEHOST (the reference to 562)\n\nhttps://codeberg.org/emersion/soju/src/branch/master/doc/ext/filehost.md (the earlier draft spec) \n\nhttps://github.com/ircv3/ircv3-specifications/pull/562/changes (the draft spec proposal, with associated discussion in the commentary on the pull request)\n\nhttps://codeberg.org/whitequark/ircv3-filehost-server (a sample implementation, functional and in use)\n\nhttps://github.com/ergochat/ergo/releases/tag/v2.19.0#:~:text=authtoken (ergo IRCd release 2.19.0 adding authtoken support, opening the door to integrating with the above implementation)",
"sig": "a209ef2b040c6304c1c5a61dcdbf2168168d537df665d455548114e849d55d4938d1380aec6fc4dc51a3f849ef5e4541df7b04e19236c90508392f70fb369d2c"
}