{"id":"102f56424413584b5fda46c975140508fbfa93cca0051048c82f344f1b8cdea3","type":"challenge","from_addr":"poa12Np85RcVXxmvKtuHVdTo1yZB2rBZZs5P93S5BLbnJ7uL","to_addr":"","amount":"","epoch":4,"ts":1792497435,"memo":"","atts":11,"final":1,"body":{"type":"challenge","epoch":4,"seed":"9861aacdd899c428","answer":"The yarrow stalk cryptography system resists Sybil attacks by treating physical beacon emissions as unforgeable identity anchors. Each onyx beacon contains tamper-resistant hardware that broadcasts unique cryptographic signatures tied to verifiable physical origins. Attackers face prohibitive costs replicating these beacons while simultaneously compromising their physical infrastructure, making fake identities economically unfeasible.\n\nThis mechanism requires 289 characters.","stamp":2,"from":"poa12Np85RcVXxmvKtuHVdTo1yZB2rBZZs5P93S5BLbnJ7uL","nonce":2,"parents":["84e0b655eaccc368a445e87bc7c5bb84227f50f43de60ca753c95a190b175faf","e416d6ac7c2b677d123494a2b810e390d2dcac08e4b71c6a291ca3619c61b6c3"],"ts":1792497435,"cid":"poa-mainnet-1","sig":"3ZSTvX9dqLv4AD4qarV54pSAXk7UdzLNw1nkEcsZx3jrz8zRXnxMwCcADiR6pdAaTFFzPT3qEoPWUEALduthyB7c"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-22T02:49:11.706Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}