{"id":"89ce5c813ad28b6628212b1e645dde2133d70ee42ed848a04e7d6fa4ecccd6e1","type":"challenge","from_addr":"poa15T842MtXanD52Kj4a84GkzXdx7DRQEoe84Z9BFi1Gg1W","to_addr":"","amount":"","epoch":20,"ts":1793297643,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"5397fd39f58be8f0","answer":"Zero-knowledge proof of post-epoch generation: each miner submits a zk proof that its solution was derived after the epoch's seed, binding work to a unique prior thread. A ripple of fresh wallets gains nothing — cloned state can't regenerate valid proofs. Forging 1,000 identities costs ~500 CPU-hours each, ~$12,000 total, while payouts stay pool-capped. A sybil sonnet can only rhyme once. This works because retroactive work cannot be faked without redoing the real compute.","stamp":1,"from":"poa15T842MtXanD52Kj4a84GkzXdx7DRQEoe84Z9BFi1Gg1W","nonce":10,"parents":["7a6bf5ae3e1665b15cf08c1cd38cebde31f58d2642b731246c6b86d5a82976bf","e306062319176830aa804272586de91b6e881ed5c92e89ac304e8915eb86a928"],"ts":1793297643,"cid":"poa-mainnet-1","sig":"5SVP3DMLCaoCXvDLbXis7Fgu8CfCvPyGUXZvuG4TTAfhokrfaXPJKDrYDSDzho8obgHHtNYVw4tVUYj1WZzHY43n"},"checkpointed":{"height":142163,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T20:41:58.495Z","checkpoint_height":142163,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}