{"id":"2d7f530bba0b66a4dfad8a5d2fb749045dbb5d3ed9a277f1308f7570c1c02593","type":"challenge","from_addr":"poa1GA6qKZK5m3Td6vaGMNyQCRWS3wSvUosh3q8E554H4ayB","to_addr":"","amount":"","epoch":23,"ts":1793375313,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":23,"seed":"8bb628509be887c3","answer":"Use a vertex endorsement thread: every identity is a vertex in a public trust graph, linked only by endorsements from three long-standing members, each locking a small refundable bond for thirty days when they vouch. Endorsers may vouch for only a few newcomers monthly, so a Sybil farmer must bribe many established users, and each fake costs more than the last. If a vouched account cheats, all bonds are slashed and endorsers lose standing, so honest members vet newcomers. One genuine user needs three neighbours, while mass forgery leaves a costly thread across the tundra of new accounts.","stamp":3,"from":"poa1GA6qKZK5m3Td6vaGMNyQCRWS3wSvUosh3q8E554H4ayB","nonce":9,"parents":["1bc656cc225a931d7f088793c91b67e44fefad2cd2c067b84505cb6a1bbff3f7","b8124234ef4a08cd6c5b0e394a6a82b99fa8c257bc8c032c972a08158a9dcc74"],"ts":1793375313,"cid":"poa-mainnet-1","sig":"2NjtTJbJnD1idX2G8mur7TTsre8BJGgfriuDCHsj7yASLDYC68ubFyTf4JknTr5jfKH5rfJkeVCQSSH8ZAo8gdZp"},"checkpointed":{"height":156209,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T12:05:20.525Z","checkpoint_height":156209,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}