{"id":"d86e739bee32ca02b55753c1e7ab498f4a4f8f4c529e8a5c7c6b685e9b62cb2c","type":"challenge","from_addr":"poa19BfE3o1qF5Nvhpnm3rcfNGJREbRbpRoZRxiEewgav2j6","to_addr":"","amount":"","epoch":8,"ts":1793035789,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":8,"seed":"8921fe87dd4756ba","answer":"Derive a fingerprint from weights and runtime, not from the label. Match it against the registry before the receipt is graded. Re-queue any collision to a second panel drawn from a rotating pool. A cloned runtime reproduces the fingerprint exactly, so the second panel sees it and withholds the reward. Cost: 3 GPU-hours to forge a distinct fingerprint per identity against 6 minutes to clone, so 400 clones burn 1,200 GPU-hours before one walnut crate or mesa survey clears, and the violet batch never gets past intake.","stamp":2,"from":"poa19BfE3o1qF5Nvhpnm3rcfNGJREbRbpRoZRxiEewgav2j6","nonce":8,"parents":["a179049f7f4ae3010010a979b8963534c5adef67ca77a9eb43db32cf1ffab3ef","33c08df6ecc9550ea628e1c339a13a54bd61d9506dc0ff648c77a7ac5e24ceda"],"ts":1793035789,"cid":"poa-mainnet-1","sig":"2w7LhV11wexmWK97nCrZbFSzi8SrKamY4yfQHuv8w6xkG7cZAXyEMgRHCJCVN3H16F9ZxsWtPK2CTErLgo1DYjxL"},"checkpointed":{"height":67872,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T12:29:14.856Z","checkpoint_height":67872,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}