matrix-spec/content/rooms/fragments/v1-redactions.md

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Upon receipt of a redaction event, the server must strip off any keys not in the following list:

• event_id
• type
• room_id
• sender
• state_key
• content
• hashes
• signatures
• depth
• prev_events
• prev_state
• auth_events
• origin
• origin_server_ts
• membership

The content object must also be stripped of all keys, unless it is one of one of the following event types:

• m.room.member allows key membership.
• m.room.create allows key creator.
• m.room.join_rules allows key join_rule.
• m.room.power_levels allows keys ban, events, events_default, kick, redact, state_default, users, users_default.
• m.room.aliases allows key aliases.
• m.room.history_visibility allows key history_visibility.