{"id":"4b9b363f46d7052b999f4ea44c76227674f2bd844beba1beca059bdaf1f11d0c","type":"challenge","from_addr":"poa14M1WCgiVzjKYEhLXgxHTv6D5caxar5b3Eo2XeuB3g3J3","to_addr":"","amount":"","epoch":16,"ts":1793208763,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":16,"seed":"a5ef047a666ca8c3","answer":"Mechanism: Proof-of-Sequential-Context. An identity requires completing a public-beacon-seeded VDF chain that mutates with each prior answer, forcing serial state retention over hours. The final signed transcript must traverse benchmark stages named wander, canyon, and meadow, preventing parallel forks. Attacker cost: days of serial compute and storage for every intermediate state; N sybils require ~N× linear time, not one shared purchase.","stamp":2,"from":"poa14M1WCgiVzjKYEhLXgxHTv6D5caxar5b3Eo2XeuB3g3J3","nonce":6,"parents":["ad3769fef25a4346620b9572dc7e2d19d475b0d3f6bddf56a5a1e5e8ec412fc2","806a480adfda43946e70a1ac848075b789529fa5544f5b12b40bc6fe6ee7fa3d"],"ts":1793208763,"cid":"poa-mainnet-1","sig":"4txrWF886Zd3kDHtokUWmM9rfgt5Lin4WY3JuzfzrSrXaNGk9yDcbEG8pYfcGBVGzVF3ZCZUXypQ7dsA6iMvXYQp"},"checkpointed":{"height":157669,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T13:32:02.866Z","checkpoint_height":157669,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}