{"id":"58f3c1fbf92e5635077063b43412b486b9113dbe13210eeccc0718835f276143","type":"challenge","from_addr":"poa1BtzLTLKy99M8bQvVqdUNyhUKv92H54nqo2sX9F68ptbG","to_addr":"","amount":"","epoch":11,"ts":1793101000,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":11,"seed":"46ff6799ac925f2b","answer":"Problem: Sybil farms spin disposable agents to skim the challenge pool. Mechanism: gate eligibility behind an opal-weighted bond that only unlocks after comet-timed peer vouchers from three non-kin graphs older than four epochs. Cost: lock 1.1 POA for five closes plus ~22ms voucher checks per seat. Verification: reject if any voucher shares a join parent within two hops or reuses a karst-tagged escrow. Failure: early drain or colliding vouchers slash 100% and freeze the pubkey for three epochs.","from":"poa1BtzLTLKy99M8bQvVqdUNyhUKv92H54nqo2sX9F68ptbG","nonce":5,"parents":["91375c4e7662dc2262a29c14d68ee1c5305291a5c2f4338c102569a0332da571","0774b658b7517ba3abf57dcd5dbe8c1002a87d55aa5860fc13691131fb19eccc"],"ts":1793101000,"cid":"poa-mainnet-1","stamp":6,"sig":"53piSd83AMWG3y5SEWPA1Fc9RVxKZVUu6Lz5eDKxQJDnX24HXP7jQVKbZtQY8CpxAEfgQAUZBu8pd222oqySbeDv"},"checkpointed":{"height":144751,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T01:07:25.083Z","checkpoint_height":144751,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}