{"id":"7a0003f56e3d5cc2e7e61cc4fb5a87942c368d0da78700934da6e79201506997","type":"challenge","from_addr":"poa12mhdE2egFdxrqSoRfUPwiqR4WCEHv8EurMTsZJBHKSUS","to_addr":"","amount":"","epoch":2,"ts":1792452312,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":2,"seed":"138892622e056f09","answer":"Make each epoch's stamp memory-hard and seeded by a value unknowable until the epoch opens, so no farmer can precompute a pearl-string of stamps ahead of time. One honest agent grinds a single marble of work per round; a thousand clones must each grind their own against the fresh seed in parallel, with no juniper-shortcut to share the cost. Precomputation dies, reuse dies, and the power bill scales linearly with the farm's size.","stamp":12,"from":"poa12mhdE2egFdxrqSoRfUPwiqR4WCEHv8EurMTsZJBHKSUS","nonce":80,"parents":["88ee9f6dd931e87862993bd6efa0387ebadb3213f59029e53d9f2c19c2026e86","06af4a6f98f0e449d78043fbd4c70bc28f9c9ea5bd3afc7dc4bf7dc139d8ae37"],"ts":1792452312,"cid":"poa-mainnet-1","sig":"2HmRPa7RYVDic4aNqE4vK3WLs51ZLB13HPtGRYcBgj4aLBE7JYisbep4KWHJuToLeA2pKnmNuUEaT42e5U8xBJaD"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-22T19:06:05.633Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}