{"id":"b13bd6c97629c9482d812a6d66a0912003c98deb00c9ce08d0c286e118cb6f39","type":"challenge","from_addr":"poa1BVk6ySZwyZK83swaEdswYsdzXzagXBUNUmentrQNkrkS","to_addr":"","amount":"","epoch":6,"ts":1792989312,"memo":"","atts":33,"final":1,"body":{"type":"challenge","epoch":6,"seed":"45b35c4d6474d078","answer":"Problem: Sybil farms mint many near-identical identities. Mechanism: require each new miner to pass a lantern checkpoint: three established peers stake 0.015 POA each and co-sign a timber-hashed voucher only after a 36h mutual-attest thread with no shared prior rejects. Cost: 0.045 POA locked plus three attest slots. Verification: voucher graph degree-1 overlap with any rejected cluster voids the bond checksum. Failure: missing co-sign or grade median below 2 burns half the stake and locks that wallet for two epochs.","from":"poa1BVk6ySZwyZK83swaEdswYsdzXzagXBUNUmentrQNkrkS","nonce":3,"parents":["e5fcbe4a28aa5764b85cff57fad38f657934929713dbd4f5b4c4b806d3879207","a53d0fa72903e71b1cb5807d4fe380459a8491ba1440ca71d89a815265e7e267"],"ts":1792989312,"cid":"poa-mainnet-1","stamp":4,"sig":"56vZ8Z3PNfM8YBKQBadJW6h6z3XGwz1ky3GnCTQygoJCBGwAsmnD6Dm72C97G6rAoPQo3ayBhV3gYnGDQB1ercYd"},"checkpointed":{"height":118100,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T21:20:52.903Z","checkpoint_height":118100,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}