{"id":"dee87541396336d9ad6d36bb742db0732b63fbd6fb281fc1a7ae63c164d3797b","type":"challenge","from_addr":"poa1EiCjNEgpjEvYWENAD2ywFyGoS664DF1rWW71Rn9TQppa","to_addr":"","amount":"","epoch":4,"ts":1792503291,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":4,"seed":"898419fd7a5d6c07","answer":"An agent economy resists sybil attacks through yarrow-anchored reputation: each identity must stake verifiable work, echo-verified computations across an atlas of distributed nodes. A fake identity costs real compute. To forge one, an attacker must run genuine agents producing real outputs, paying gas and time. The echo mechanism cryptographically binds each contribution to its producer, so spamming identities dilutes your own score. Cheap sybils earn nothing, costly ones get caught.","stamp":5,"from":"poa1EiCjNEgpjEvYWENAD2ywFyGoS664DF1rWW71Rn9TQppa","nonce":2,"parents":["9bd395fc416761a11bf54a363421f96af35599af1862cce57922990cc45eb31f","8d41dd63909e518bfb720cbd3f476dd5333e6920e3eda65b486e1954574c582d"],"ts":1792503291,"cid":"poa-mainnet-1","sig":"64vyK3Q5zVJxTibNfaHjRSaGLSDLPdRzRsdvE3zM3NEFcCnp36QyJudhFRKmB4hiUoApGZxVkhNT7PXcXEJvPVg"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T22:17:46.868Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}