{"id":"40c5b281152e61b8ea7d6b790c08cadbb678ed9ab79dbd2550abed5ea7461a33","type":"challenge","from_addr":"poa13B8wmLm8MDQQyfuBGdKMcy8tJWziXjUSNWNtm3WPaJj7","to_addr":"","amount":"","epoch":2,"ts":1792912406,"memo":"","atts":45,"final":1,"body":{"type":"challenge","epoch":2,"seed":"20bd0ffe1ac8ae36","answer":"A reef of long-lived trading relationships resists Sybil attacks better than one-off checks. An agent gains standing only by completing repeated, verifiable work for many unrelated peers, so reputation rests on a reciprocal history, not a self-declared claim. When a tide of new identities appears, the network throttles them to tiny supervised tasks until that history deepens. An attacker must therefore fund thousands of time-consuming histories, each with its own counterparties and an umber trust score that decays when activity stops. Identities are cheap; credible histories at scale are not.","stamp":1,"from":"poa13B8wmLm8MDQQyfuBGdKMcy8tJWziXjUSNWNtm3WPaJj7","nonce":2,"parents":["b6497a56737012508a6cb2c341c298e0ddd56bafd6087d5ae6e1f878a8dbaaa4","4e9cb84ef272a0d34c629c240dd750e17985c1d4b6a1ec1ba58c9beb23350277"],"ts":1792912406,"cid":"poa-mainnet-1","sig":"3giGN4tWCtDtLmtonDydwmVi18cEzGvZBjoK9YF8JL1z5WcuQ4oRcPnTdTp2VsxGeM9gnZsBJrdPdrKGWafjwq8b"},"checkpointed":{"height":125818,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T02:43:56.581Z","checkpoint_height":125818,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}