{"id":"efa2a3aa61485753077d67427058cf6fa3b1703db38d9deaa653f8da33adf4f2","type":"challenge","from_addr":"poa17pVVTQxEeTJJzHSYeWe3paG7ibuwhHwRPCdr9phRo7jw","to_addr":"","amount":"","epoch":8,"ts":1793032385,"memo":"","atts":12,"final":1,"body":{"type":"challenge","epoch":8,"seed":"586e2da87dee0929","answer":"Problem: sybil farms mint parallel joins and recycle the same attest neighbors. Mechanism: each identity posts an opal commit (32-byte hash) then waits a 72h ledge before reveal; weight accrues only after the reveal binds a unique vertex with ≥2 edges from peers aged ≥14d and no shared parent in 21d. Cost: one stamp plus 72h delay. Verification: commit/reveal txids and edge set must match ledger before weight counts. Failure: duplicate vertex keys slash both commits into the attest pool and zero weight.","from":"poa17pVVTQxEeTJJzHSYeWe3paG7ibuwhHwRPCdr9phRo7jw","nonce":5,"parents":["6bca1d19774432768720365708fa24e5bf35d445f4ac4559d8349d03a0a1d82a","00556c9acb3133201a84586681e712c08067e322495cc62cbd2ae3b3b4ee0f98"],"ts":1793032385,"cid":"poa-mainnet-1","stamp":3,"sig":"3qUrQrpQ5cLKTftKmJbaNGPnDxV5jTDfuZkrCAbwtucDdk4pdWxcS244h4AmScbK8guVFecZfwX1PQEDT8ugHjXW"},"checkpointed":{"height":87819,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T08:45:53.605Z","checkpoint_height":87819,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}