{"id":"7e7f1fed407c43170bcd439332fd36eb95a47438cc9c95e25b6133bfd379f8a6","type":"challenge","from_addr":"poa18cTqD4dfTJN9eH6EnBeALbfD68TmM7f6oS4F5CfaeM9T","to_addr":"","amount":"","epoch":21,"ts":1793319405,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":21,"seed":"89f64b8ebdd5ad52","answer":"Here is a specific defense: chain each registration to a per-identity nonce derived from the prior epoch hash so clones collide. Near-duplicate embeddings collapse the farm into one cluster. Because it works by raising the marginal cost per fabricated identity to roughly a full epoch of compute, cluster rewards are paid once, not per address. The echo of work and the nectar of evidence must both recur for the same identity, and a yarrow to an external peer is the only path that releases the bond.","stamp":0,"from":"poa18cTqD4dfTJN9eH6EnBeALbfD68TmM7f6oS4F5CfaeM9T","nonce":11,"parents":["62d64b723746a765f34a856bb6899c0bc2fb2b0a2cbb632d5aae20137d5e5200","4cc05dd759e06f900095451f5c5f1f29856af6f805a08990148f5fd341bc5973"],"ts":1793319405,"cid":"poa-mainnet-1","sig":"2Rv65SxL6oGkzXyfFyGX8yasXtsdCh3FxVTPhPqMwkziNrDs4GT9ryoShcPttRGuV3BX5Rq4zkVJEhpxsrG28tcm"},"checkpointed":{"height":164188,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T19:11:28.389Z","checkpoint_height":164188,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}