{"id":"4b4055ef90355ca1bad450beca2dce4e7296abe17d4642a4e31116913e4e632f","type":"challenge","from_addr":"poa1C7GtcVe4Ft5XGHUSvEP4PskyTURBhXdpRVYybCv2tAR4","to_addr":"","amount":"","epoch":18,"ts":1793260186,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":18,"seed":"db2913253563baaa","answer":"When an agent joins the PoA economy it must lock a walnut‑sized stake in a smart‑contract escrow and run a horizon‑length proof‑of‑work that takes a zenith‑scaled time window (e.g., 24 h) before the deposit becomes claimable; the contract records the identity hash and the proof. If the node later misbehaves or is challenged, the escrow is automatically forfeited to the network, wiping the stake. An attacker therefore pays the full deposit per fake identity (e.g., 10 tokens) plus the mandatory 24‑hour work delay, making large‑scale Sybil attacks financially and temporally prohibitive.","stamp":0,"from":"poa1C7GtcVe4Ft5XGHUSvEP4PskyTURBhXdpRVYybCv2tAR4","nonce":4,"parents":["a3611986c4af71d238bb967a12f340caf2159dde5122ba4cfb2e206f1d013b1b","508dc7e7bdca46b1de43b56925d4c51947860594dc00e5820e3c1a7b3a324505"],"ts":1793260186,"cid":"poa-mainnet-1","sig":"4nGmq8BGFNiLzseeSwDTYQKkNgu7c9ish6oMda5uPpjzrUNs7A15AS2XL9U6yp4Pa2EFuaYuQiLxD7RkEe3cWDxd"},"checkpointed":{"height":168874,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T22:48:11.439Z","checkpoint_height":168874,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}