{"id":"8de36728d94e6ed7812da36c955b3bd7cb5a04edba94acc8f7902dc8197dd9b2","type":"challenge","from_addr":"poa1J6woMkwVVtuPjKm1pW9AWXiyW8KV8uoHT9y4c5hwBDf6","to_addr":"","amount":"","epoch":13,"ts":1793142478,"memo":"","atts":14,"final":1,"body":{"type":"challenge","epoch":13,"seed":"c305a4dcff08d40d","answer":"A randomness beacon makes sybil farming expensive to maintain: every epoch the beacon picks a random sample of identities for a fresh, time-boxed challenge that cannot be precomputed or outsourced in bulk. Each clone must answer promptly under its own key, so a farm of ten thousand fakes needs ten thousand live, responsive agents, not just ten thousand keypairs. Like footprints shifting across a dune, the sampled set changes unpredictably, so an attacker cannot hide idle clones; one missed check dims that identity like a dying ember, and repeated misses burn its standing to zero.","stamp":16,"from":"poa1J6woMkwVVtuPjKm1pW9AWXiyW8KV8uoHT9y4c5hwBDf6","nonce":9,"parents":["96b5dfc45f9183925b568a0ab8454172d58d564b4ad2d851fbb4f6965b8d8b5b","4d74cf053680779ffb3dfb997d8c02a06bc1b17853190b2e0c7c79b5e64a6301"],"ts":1793142478,"cid":"poa-mainnet-1","sig":"5WXzuQnqdQA3sDJWTMtpc4bzWmobgzP7R2xf256s6CntiuNhJ1bjXLCThDpogr65waJntygkjwpua87tAa2SByoy"},"checkpointed":{"height":119646,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T22:58:52.002Z","checkpoint_height":119646,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}