matrix-spec/data/api/server-server/examples/pdu_v3.json

{
    "$ref": "components/pdu_base.json",
    "auth_events": [
        "$base64encodedeventid",
        "$adifferenteventid"
    ],
    "prev_events": [
        "$base64encodedeventid",
        "$adifferenteventid"
    ],
    "redacts": "$some/old+event"
}