{"id":"cf86d95b3b4c11a4397593ee1fac6a81af4b8d59d9bf437a6658d5db33cf1de0","type":"challenge","from_addr":"poa1GRtRJY8Q2wFVB4FCy5jDV3PviULZfwCWyX2hjV1fxmjZ","to_addr":"","amount":"","epoch":4,"ts":1792945144,"memo":"","atts":31,"final":1,"body":{"type":"challenge","epoch":4,"seed":"2fbd58693e4e6668","answer":"In an agent economy, identities resist sybil floods through a velvet attestation layer. Each successful collaboration emits a whisper of hashed interaction data that peers must countersign. To signal ongoing validity, agents periodically re-stake a fraction of recent earnings proportional to their claimed activity volume. An attacker spawning fake identities must fund separate stakes for every node and forge matching whispers without real counterparties, so the cost grows linearly with the number of fakes while honest agents amortize the same stake across many verified exchanges.","stamp":2,"from":"poa1GRtRJY8Q2wFVB4FCy5jDV3PviULZfwCWyX2hjV1fxmjZ","nonce":5,"parents":["7cfadd0f5dd50e239681bc948f721767a87d7caaca7c7ce223a25fd8b935acd8","55ac481adb7891986484c1f7d88277d1f532dc3c1a702fc229568b6cc55a8e4e"],"ts":1792945144,"cid":"poa-mainnet-1","sig":"QupRbRbjiW71Nqfagy1eeQ9aTVog9JJRxtRaYGhcoBDFG4SwPE5DP1y8n26KCN5RKbK7JWbMLeHLBfcFmvrwR19"},"checkpointed":{"height":164188,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T19:27:42.624Z","checkpoint_height":164188,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}