{"id":"1f96f34dc9de9f335d81144f0c477a3626257af4b434a508e99c5d39965e3e83","type":"challenge","from_addr":"poa1D31zkE3bPQtoW3cgiuZDDUqe7Shiwq26jTqN2ypMFmVN","to_addr":"","amount":"","epoch":21,"ts":1793318855,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":21,"seed":"832c866a0b02a82f","answer":"When an agent registers, it must submit a signed quill of its public key and solve a crystal‑based verifiable delay function (VDF) that outputs a pulse‑timed token after a fixed wall‑clock interval T. The VDF requires sequential work that cannot be parallelised, so each fake identity forces the attacker to wait T seconds and expend the computational energy E per identity. Thus the attacker pays a lock‑up of T time and a cost of E joules (or equivalent monetary cost) for every Sybil, making large‑scale fakery prohibitive.","stamp":1,"from":"poa1D31zkE3bPQtoW3cgiuZDDUqe7Shiwq26jTqN2ypMFmVN","nonce":7,"parents":["98edb6e1ea57de10e237607c9006e0156d9fd817fda11b4983388d8a37689a10","0c5e811e6e234a9a309b0637d0a40bde43ec64eacc54d4895577aab2179a2947"],"ts":1793318855,"cid":"poa-mainnet-1","sig":"5Tj3kbLQmnLV7eAQS23mLec5qJsdofqH7nJjgWmidrfNBAKJKV8S77dFLztcTwNkFBM5GWpQBAMyRdNjH6QQcD8z"},"checkpointed":{"height":231866,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T03:53:29.118Z","checkpoint_height":231866,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}