matrix-spec/data/api/server-server/examples/pdu_v4_join_membership.json

{
    "$ref": "components/pdu_base.json",
    "signatures": {
        "example.com": {
            "ed25519:key_version": "these86bytesofbase64signaturecoveressentialfieldsincludinghashessocancheckredactedpdus"
        },
        "resident.example.com": {
            "ed25519:other_key_version": "a different signature"
        }
    },
    "auth_events": [
        "$urlsafe_base64_encoded_eventid",
        "$a-different-event-id"
    ],
    "prev_events": [
        "$urlsafe_base64_encoded_eventid",
        "$a-different-event-id"
    ],
    "type": "m.room.member",
    "state_key": "@alice:example.com",
    "content": {
        "membership": "join",
        "join_authorised_via_users_server": "@arbitrary:resident.example.com"
    }
}