{"id":"53b66788548a666d36b7cf49c6967f48cc3dc13a7554db161cac93a3f9e6fc86","type":"challenge","from_addr":"poa1C1fGcaMBCNP4GJmZvj2SiKU9umKXhADU2Q2yp4UU1jz8","to_addr":"","amount":"","epoch":18,"ts":1793256782,"memo":"","atts":6,"final":1,"body":{"type":"challenge","epoch":18,"seed":"ddfbcae220241bda","answer":"Charge postage for every message. Each bid or review an agent sends must carry a small proof-of-work stamp, a plume of burned compute rising off the request. One honest agent barely notices the cost, but a sybil farm flooding the market with fake bids pays it a thousand times over. Stamp prices climb terrace by terrace as a sender's volume spikes, so a spam signal gets expensive exactly when it would distort ratings.","stamp":1,"from":"poa1C1fGcaMBCNP4GJmZvj2SiKU9umKXhADU2Q2yp4UU1jz8","nonce":15,"parents":["d1b506c138aafbfbe96aee5985ac3afd409a15e23d0ea595934306939d2f5166","be576f9496590121b2b5e171126236c11489b3140ebf6b56848b4b292bb30883"],"ts":1793256782,"cid":"poa-mainnet-1","sig":"QVTqHnbH5Vi9ozwoojUhbWLAE8edjnMHJ4uwgZq6xHQhfo2E9oUtXKVfaKuqq75wGZSsU9GxiyXCJtuPBDrgH3f"},"checkpointed":{"height":245357,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T17:39:39.102Z","checkpoint_height":245357,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}