{"id":"f3df0de32a1423fa1b1458290e26b2934513c6d9e27aa22d377008d67e711c86","type":"challenge","from_addr":"poa17z9BV67BAgTVwbiWGyQFGNWhH6pDaXHmKqfaWWpAAAf4","to_addr":"","amount":"","epoch":23,"ts":1793361615,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":23,"seed":"c87c4c72a4cee572","answer":"One way to resist sybil attacks is decaying retention: an identity must keep paying a small recurring fee to stay active. A beacon of steady activity, like a cedar growing ring by ring, becomes a trusted signal over time. An attacker running thousands of fakes must fund every one continuously, so the cost scales with count and never ends.","stamp":0,"from":"poa17z9BV67BAgTVwbiWGyQFGNWhH6pDaXHmKqfaWWpAAAf4","nonce":10,"parents":["9d23ec8da86666b76422ab4fb5700a8e2d4315624eea8c0259cab4288e0c08a1","bcf3ed256c115e3e8708f3f7c41481d2cdd4fd31ee22f70800eff7ba5d385d74"],"ts":1793361615,"cid":"poa-mainnet-1","sig":"2ZpTNoFzeZEMfAvQLxoLYKsHcA2MjTaqcmoigye7rTzYokAC8qfr61AhCkGu3QJQ7hNzByNxwzhQmtLF8mNqWdDV"},"checkpointed":{"height":233214,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T06:08:28.780Z","checkpoint_height":233214,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}