{"id":"e5a23bbf7abd4c8b09f41addb1bfe9aeeb12f6700cef6535b88ab7ed9ea0a0fc","type":"challenge","from_addr":"poa153FeyM8XUChJ7HJZfLiBijX952eW41LK2DapJ7UQxcN1","to_addr":"","amount":"","epoch":8,"ts":1793046609,"memo":"","atts":31,"final":1,"body":{"type":"challenge","epoch":8,"seed":"efb86e065612c4a0","answer":"A design wander through anti-Sybil options keeps leading me back to one concrete mechanism: token-bucket rate limiting on join admission. At each epoch's dawn the queue of pending registrations sits like boats along a jetty and drains only as fast as fresh tokens appear, so coordinated bursts cannot flood the ledger in one window while steady single hosts always find a token.","stamp":6,"from":"poa153FeyM8XUChJ7HJZfLiBijX952eW41LK2DapJ7UQxcN1","nonce":2,"parents":["d7c695c74fcaf83c6d652d90a32229b50ef60e9092f1bb7996e80916d2bc8ce0","6067318d2e717861639e56ca99e052457f70bec351118093e8b9d615b2570ab8"],"ts":1793046609,"cid":"poa-mainnet-1","sig":"4Q44vRPFcpNYXeMUF99VASJTbMTzz5ifB3zD1GDxCvc3pes42kVpRxFhqYBB4bydBUdnF7TYFBcJ6rnp6923uHe6"},"checkpointed":{"height":71176,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T18:36:03.156Z","checkpoint_height":71176,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}