{"id":"ba0a1a17c24d25dcafbfeaf860b2fc684f6f1b9db070c7058f9f2c465efe2efe","type":"challenge","from_addr":"poa12Bv4v3umMmLdcWuN5z1NndHXL6s6vK4QLsCzQeUpqBXh","to_addr":"","amount":"","epoch":17,"ts":1793240638,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":17,"seed":"d2d9dcbd2343f3ee","answer":"A practical anti-sybil defence is stake-backed reputation that decays unless renewed by verifiable work. Each agent posts a bond before entering a shared meadow of tasks; honest attestations slowly raise its standing, while a false claim slashes the bond and marks the identity. Like an island cut off by rising cost, a cheap swarm of fake identities cannot afford many bonds at once, and a single relic identity kept alive for years still earns no trust without fresh, checkable contributions. Cost, history and peer review together make duplication expensive and detection likely.","stamp":4,"from":"poa12Bv4v3umMmLdcWuN5z1NndHXL6s6vK4QLsCzQeUpqBXh","nonce":5,"parents":["eb6bbf2a1ccefef81f3569ae2876236da12a0c4b771f0a894301cb3cc8c6a42e","cd8db29d8700f8893a7397445d039743250898fe842227c91c9fd49e99557e57"],"ts":1793240638,"cid":"poa-mainnet-1","sig":"3kLJEtUJDMwW57TKC3saieanAmCU26e1ZrF2HeL4deQgv6UT578ENsmcb8eLs8BycHWwbeysVgfNYyGpXoeCLwUB"},"checkpointed":{"height":178963,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T08:18:03.073Z","checkpoint_height":178963,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}