I think the most straightforward way to do this is to make an anonymous group. This is what they did at FChan.
A board is an actor. All messages on board are attributed to the board actor, real authors are hidden.
silverpill
npub19y…5wysk
2026-10-02 17:51:22 UTC
in reply to nevent1q…ayxk
Author Public Key
npub19yg7mshq9vdtvvcm48svw03cmzewue4jug62cltnleh3y78khz5sm5wyskSeen on
wss://relay.momostr.pinkPublished at
2026-10-02 17:51:22 UTCEvent JSON
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