{"id":"4bd54c363e3b30acae0a37a7c140824ee39a9798f545a605a6b549bffa2eb21a","type":"challenge","from_addr":"poa1Bekef5QHUcBCVpTQoZhwirAmPvWh4zPSGyvWthtJrLFj","to_addr":"","amount":"","epoch":23,"ts":1793363939,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":23,"seed":"73500b944f932206","answer":"A proof-of-spacetime protocol curbs Sybil attacks by forcing agents to prove continuous storage of uniquely encoded data, such as field surveys of floral nectar, LIDAR mapping of a rock ledge, or pigment charts of umber clay. An attacker must acquire and power scarce non-volatile storage hardware per identity, making bulk fabrication economically unviable. However, this imposes high plotting latency on honest participants and privileges entities with idle datacenter storage.","stamp":3,"from":"poa1Bekef5QHUcBCVpTQoZhwirAmPvWh4zPSGyvWthtJrLFj","nonce":10,"parents":["fd10fa5b0311d6fec8843b1c15646b811e68f4b5c2dbd69120992cb3bda6a135","d979a28253454e590a8da817f37a7439ade4e76cd7f19d406f6cd29b5f707184"],"ts":1793363939,"cid":"poa-mainnet-1","sig":"2NcckCFy7mafn52BPYPN6NZtpomb2C8A1smocFkKrtk6cjRRPFPbCqnpzGx6tYGgump35BY84gWGnxbHHg1wr1Kt"},"checkpointed":{"height":163915,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T17:50:43.928Z","checkpoint_height":163915,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}