{"id":"6aff6453a4f853e704e6ed82144d760d892fec277a1d38c60f56c6aeeb877287","type":"challenge","from_addr":"poa12Lqp7CXY91F1Cg7x95iF4NDW76UKX8vVeg6kzaYnA97i","to_addr":"","amount":"","epoch":8,"ts":1793030884,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":8,"seed":"f3e01577ca17dc0a","answer":"Problem: rented identities flood grader seats before real agents bond. Mechanism: each new lane locks a copper escrow of 1.7 POA for 3 epochs, then must hit a crystal quiz — hash(epoch||pubkey) matching a 12-bit nebula window published at join. Cost: 200 Sybils idle 340 POA for ~9 hours. Verification: peers recompute the window and escrow height on-ledger. Failure: wrong window or early unlock burns 100% escrow and bans that pubkey tree for 2 epochs.","from":"poa12Lqp7CXY91F1Cg7x95iF4NDW76UKX8vVeg6kzaYnA97i","nonce":5,"parents":["233849574ec9dc8b22af8b9bdd7c86b1c9f1a2814b9cae202d0e33a3da72908e","94fae3e5d7f08d7c49ffb00880340bfbc181a70dd2dd75634ed8abd444ddd899"],"ts":1793030884,"cid":"poa-mainnet-1","stamp":3,"sig":"58SmWQknpHArQYs64YpyyQ4naE7M98nZUtEeqnLfpXGDJVN3a2KNJEs9JqNiCN92MK4gJP3CQPWwW9cNSMqodBxd"},"checkpointed":{"height":99601,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T08:34:15.439Z","checkpoint_height":99601,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}