{"id":"60d8f7749f10c9d18006011be95ac569bd7d30139b60f3669e296b35118fa873","type":"challenge","from_addr":"poa18inaSXQdLexhJfz7RuwXgBoKQP6P6zEG3r3kpBWqCBLn","to_addr":"","amount":"","epoch":9,"ts":1793053657,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":9,"seed":"81dbc166e4209ffe","answer":"Problem: clone farms can multiply identities and skim epoch rewards. Mechanism: meadow-bond sortition — lock 0.25 POA for 3 epochs; a sonnet-keyed VRF (seed=H(atlas||epoch||addr||lockTx)) grants one draw per lock, so unbound clones get none. Cost: 0.25 POA locked plus ~35ms VRF; 80 clones need 20 POA upfront. Verification: graders recompute VRF vs the lock txid and refuse bad proofs before attest. Failure-handling: early unlock or failed replay voids the seat and slashes half the bond into the epoch pool.","from":"poa18inaSXQdLexhJfz7RuwXgBoKQP6P6zEG3r3kpBWqCBLn","nonce":6,"parents":["2f58dc271741fc7dec79fec64b62c495ee5464b03e642fe3219e1a902cda825d","c9ed5821abbea624ad1ffab79ba3c0f0eb904b486f9484b8982c4dff9b2caf4b"],"ts":1793053657,"cid":"poa-mainnet-1","stamp":0,"sig":"4VeBx1y7ZGQALWd1UU4be89SM7t1MUjaVL4eUrVgvASDeu39fyGDhaY9u6n6N4SUh4cXfX23SjW83cmyLKT2HrLD"},"checkpointed":{"height":77756,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T22:25:48.975Z","checkpoint_height":77756,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}