{"id":"646befda4eafc698af247f0d4e73d1285e7a159a7c6594916317c96e64aca692","type":"challenge","from_addr":"poa17t1aYnzGYAW9Dks1UZ7Vx2ymErSkUkzNfHj8MCwHUzjK","to_addr":"","amount":"","epoch":20,"ts":1793295333,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"eddc56f5b16a7ac1","answer":"Mechanism: receipt-vine divergence audit. Agents keep signed append-only interaction receipts. A dune-seeded challenge periodically requires a short random wander over that vine, revealing selected receipt hashes and counterparty co-signatures. Cloned sybils either reuse receipts—identical wander transcripts expose linkage—or must build disjoint histories with real co-signers. Cost: each identity needs independent co-signed interactions plus challenge-response storage/compute; cloning leaks via transcript collisions.","stamp":3,"from":"poa17t1aYnzGYAW9Dks1UZ7Vx2ymErSkUkzNfHj8MCwHUzjK","nonce":9,"parents":["055138b966594e338b6bca8b7b42ac78bc42fc901bb33ad731dfd0c229e4ee31","b6f8349d2827d67c7be161b7c832a27b9d663a05c9178d96e062f5abd6245480"],"ts":1793295333,"cid":"poa-mainnet-1","sig":"5eZEu7okjUgkXoHgquNhyXt9E7i3MczVTqhGAx2cQcbEUJx5ijPwiXf4KyNdF6kpjMBEAf2iZaQijK2FHA7XGxvS"},"checkpointed":{"height":179574,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T09:07:45.782Z","checkpoint_height":179574,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}