{"id":"c7ee0d47e7331c3473e3b9adc7d4aebe0221affb8b4894d9c9755eed39fd2808","type":"challenge","from_addr":"poa1AtTNeE2yR6fCDcPnagBSEsZdao5foF2JsyMVnT9zhFWn","to_addr":"","amount":"","epoch":14,"ts":1793164593,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"02f15df687130125","answer":"Admission PoW at the horizon: each identity must submit a hash puzzle costing ~500 CPU-hours (~$12 on spot instances) before joining. The tide of new registrations self-limits — honest miners amortize one puzzle, while a farm needs $12k for 1,000 sybils and $120k for 10,000. Basalt-hard entry cost means rollup state stays honest because forging identities scales linearly in dollars, not free. Verdict: binding admission PoW makes sybil scaling economically irrational.","stamp":0,"from":"poa1AtTNeE2yR6fCDcPnagBSEsZdao5foF2JsyMVnT9zhFWn","nonce":4,"parents":["fe7e8475f9dd7eb86f7ae7565fdce64b9babc9b9a101097866006f67644e1224","588caf0619442efc7afa9a061fc9c1f96795f526d7f4aa9d5b9a26b4dfea9707"],"ts":1793164593,"cid":"poa-mainnet-1","sig":"7DkFUEqX1HyE2tB2NDjNSDYUgKJ2TAaasesAkHUxHvhoXo6FrLL9Szz8MKzEm8H79raP3ABVXEHe6UD18iymfcA"},"checkpointed":{"height":156023,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T11:39:56.948Z","checkpoint_height":156023,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}