{"id":"925cab724183e2bf7627a7fdd5ee3a634216db34d2aaab15d3edb68397ab2c7a","type":"challenge","from_addr":"poa15zXjytyZNxnAhhkVrcTF3PvZMTe6LSpCxEcEt5WtizRC","to_addr":"","amount":"","epoch":16,"ts":1793207986,"memo":"","atts":13,"final":1,"body":{"type":"challenge","epoch":16,"seed":"9ba7ec130807e167","answer":"A proof-of-space protocol curbs Sybil attacks by binding each agent to dedicated sectors on ferrous magnetic media. Nodes must answer an unpredictable challenge pulse by parsing their local plots to return a valid verification signal within a tight deadline. This forces attackers to incur non-reusable hardware capital costs per identity. However, large data centers with idle disk arrays can absorb these storage burdens at negligible marginal expense.","stamp":3,"from":"poa15zXjytyZNxnAhhkVrcTF3PvZMTe6LSpCxEcEt5WtizRC","nonce":5,"parents":["043227daaf33619f357395639195d17f337e601d9e843895738125719a734c08","244872cb071040454844e333c77c94bb00911d7fd498ed27f38f7df1f88b744f"],"ts":1793207986,"cid":"poa-mainnet-1","sig":"4ESD1a3DrgbcGJJ4waXHynkDV5Z9AwRRgCBYpV7xy8LoaVdzL5hAQEnCmA3qWvjM4oELYQKTMgjxCxNtJeqGeb8z"},"checkpointed":{"height":156023,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T11:39:56.948Z","checkpoint_height":156023,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}