[ActivityPub IDs are URIs](https://www.w3.org/TR/activitypub/#obj-id ), and URIs don't always require DNS or servers. That depends on URI scheme.
One AP-compatible URI scheme with key-based naming authority is described in [FEP-ef61](https://codeberg.org/fediverse/fep/src/branch/main/fep/ef61/fep-ef61.md ). This FEP discusses HTTP transport, but the object format is designed to be transport agnostic. It is suitable for local-first applications too
smallcircles (Humanity Now 🕊) (npub12sq…6w0r)
silverpill /
npub19y…5wysk
2024-07-16 20:33:13
in reply to nevent1q…w9fa
Author Public Key
npub19yg7mshq9vdtvvcm48svw03cmzewue4jug62cltnleh3y78khz5sm5wyskPublished at
2024-07-16 20:33:13Event JSON
{
"id": "accdbce2998bbc1deb1cbc98b1d9dcdaaf11543f184213109f84e87cf536af40",
"pubkey": "2911edc2e02b1ab6331ba9e0c73e38d8b2ee66b2e234ac7d73fe6f1278f6b8a9",
"created_at": 1721161993,
"kind": 1,
"tags": [
[
"e",
"1e70549ab5f1c48dbb84438f180391ba78a897ea86f538159b685888d375dbbf",
"",
"root"
],
[
"e",
"13529cdace9bf602f45e2f67eeecaeab5986d82d749a13eb4180a1219437bab5",
"",
"reply"
],
[
"p",
"2911edc2e02b1ab6331ba9e0c73e38d8b2ee66b2e234ac7d73fe6f1278f6b8a9"
],
[
"p",
"15226b03622be92d6c3a87fc0f35abcb497a8426b0b5351bf1cd9f6b247a1a2f"
],
[
"p",
"5400e622e1685195531c21da5ee76154066f868f22ff764633ed850516e3745c"
],
[
"proxy",
"https://mitra.social/objects/0190bd3f-cc13-b29b-5990-d4725bfb8597",
"activitypub"
],
[
"L",
"pink.momostr"
],
[
"l",
"pink.momostr.activitypub:https://mitra.social/objects/0190bd3f-cc13-b29b-5990-d4725bfb8597",
"pink.momostr"
],
[
"-"
]
],
"content": "[ActivityPub IDs are URIs](https://www.w3.org/TR/activitypub/#obj-id ), and URIs don't always require DNS or servers. That depends on URI scheme.\n\nOne AP-compatible URI scheme with key-based naming authority is described in [FEP-ef61](https://codeberg.org/fediverse/fep/src/branch/main/fep/ef61/fep-ef61.md ). This FEP discusses HTTP transport, but the object format is designed to be transport agnostic. It is suitable for local-first applications too\n\nnostr:npub12sqwvghpdpge25cuy8d9aemp2srxlp50ytlhv33nakzs29hrw3wqct6w0r",
"sig": "aaf4f8e896e07015250df6ddaa7f9847950d415d5de2aa4a4cb7d7c710b8ccceba6efb7cd90b4ef760ffaba60150da7a3378d670012fa8c24cf283336238feff"
}