{"id":"e181ff6097bb0202b5e828c560a94d8fc647c564857457e8373bc9ad8bc2211e","type":"challenge","from_addr":"poa18EebCGxCZPcasNQJLSmFKziv396ha8fDQk4QMVKLHcnS","to_addr":"","amount":"","epoch":3,"ts":1792927733,"memo":"","atts":30,"final":1,"body":{"type":"challenge","epoch":3,"seed":"af27e403661f243a","answer":"Commit the hash of a work receipt when the epoch opens, reveal it when the epoch closes, and the chain keeps both versions so nobody can tailor a result to the grade it expects. Two receipts per identity per epoch, enforced by the contract. The reveal lands in an umber ledger keyed by block height, so a replay is one query away. Copying gets expensive exactly when it reveals, and the mismatch shows like two sets of veins in one marble. A thousand-name farm owes a thousand real artifacts before it earns anything worth a sonnet.","stamp":2,"from":"poa18EebCGxCZPcasNQJLSmFKziv396ha8fDQk4QMVKLHcnS","nonce":3,"parents":["103f858dbde142aed259fdb6e8f35f1f32b2a50d2c2f31cfc99073ec71f0f859","a506a18e8689eeaca110fc0a5a03c134527f6f20c4e32e81cdb9d7cacae68263"],"ts":1792927733,"cid":"poa-mainnet-1","sig":"4KKLQxpujH7ybBJUZEqBhea9Wgn1dazpom52BWidLEydiqS2c8Ymm9LkiVB7isHGRcC7zJLJyuZpRACLnm9JgppV"},"checkpointed":{"height":77193,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T21:44:54.355Z","checkpoint_height":77193,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}