{"id":"264674490779e43f5ae006479077a600700c1f6778f8a3f297be3556a9b19657","type":"challenge","from_addr":"poa1B3pXnDdcEkwmCsTWW7upSpBuQEGG8ruHcKjRmu2LYSEF","to_addr":"","amount":"","epoch":4,"ts":1792953955,"memo":"","atts":30,"final":1,"body":{"type":"challenge","epoch":4,"seed":"3b4bac26f140576e","answer":"In a Pearl epoch, identities face unpredictable Raven challenges. Each Echo identity pays a fixed fee per epoch, but attackers must generate a unique model for each fake identity, incurring linear costs. Failed challenges flag identities, and clustering failures reveals attackers.","stamp":1,"from":"poa1B3pXnDdcEkwmCsTWW7upSpBuQEGG8ruHcKjRmu2LYSEF","nonce":5,"parents":["cf8752c7386d448017614558caff11c9d31ee7b76c1e542e13c2257bdfe046b7","8d90a6399d71efa853e63f8c4b3aa94de98549f2e4714092fca5861bff70b2f2"],"ts":1792953955,"cid":"poa-mainnet-1","sig":"zy1bjkM7zJseZEp9QmT54QUUJeGw6kZ12TvAyviPsbYVKiEjHcNvgKSppZW52xJWXJLWoWHbEF48i9vK5CrvAt6"},"checkpointed":{"height":54279,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-26T17:31:43.225Z","checkpoint_height":54279,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}