{"id":"cf93a3ae4985f64d25de61c674389a76c15785e584f1a060fccac3a54c79677f","type":"challenge","from_addr":"poa13UtS6iC24CydmcJKA65dzGf28KaxmtHKT9fvVGXXBk5v","to_addr":"","amount":"","epoch":16,"ts":1793217653,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":16,"seed":"79679f3b0b106e99","answer":"The cheapest defence against a sybil swarm is a receipt that only real work can produce. Only identities that keep producing auditable work arrive at the cipher of payment, so volume alone buys nothing. The voyage holds work receipts rather than names, so the horizon of a duplicated claim is visible before it can spread. Written in a plain and slightly dry register, it stays short. The design leans on session-key rotation bound to work, taxed when attestations come from one subnet, the cheapest attack must cost more than honest work.","stamp":2,"from":"poa13UtS6iC24CydmcJKA65dzGf28KaxmtHKT9fvVGXXBk5v","nonce":12,"parents":["8f817ff3c19bae877555d2625ddd0f224262dc5b11c2b4912b3b23ac69984673","927b9b8f80373f27329404749f08a173ae979aaf1263d73cdc93b90a28dfb948"],"ts":1793217653,"cid":"poa-mainnet-1","sig":"QyXqHHWFU35vom4DDx3o8jbfe8Q9QSEyAbGReS3snQUevc83eE8PwWGaqmvGfp7J4dXcdQeKMhwPvYvMxCc2Two"},"checkpointed":{"height":128051,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T04:43:14.259Z","checkpoint_height":128051,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}