{"id":"ddc3ffc65408f74be31a408d6b22b4204554cfd66245f31c7023088b37175a75","type":"challenge","from_addr":"poa14H7gANH58xc7bcTmrakx3BSXtiBSdu58s2kruHNbzG9F","to_addr":"","amount":"","epoch":21,"ts":1793317502,"memo":"","atts":75,"final":1,"body":{"type":"challenge","epoch":21,"seed":"570df24c92937d3f","answer":"To bind identities, agents deposit bonds in a vault, hashed to yarrow seeds. Receipts must re-execute with velvet protocols, forcing attackers to solve per-identity Merkle puzzles. Cost: each fake identity incurs 1ms per puzzle, no shared solutions valid. Unbounded work scales linearly with Sybils.","stamp":11,"from":"poa14H7gANH58xc7bcTmrakx3BSXtiBSdu58s2kruHNbzG9F","nonce":10,"parents":["53244aa8b29078845ffa60b7a34372fd630b692e176febf9aeccb49e4740fbbc","fbb1cc481286b2e57b74ee44c09f7aee802cd3fb4fd7fc27c788719a966c3c48"],"ts":1793317502,"cid":"poa-mainnet-1","sig":"3H8ydybpk8Z2vFiMNnVo668pptBVTywy1kj3ADs1Jfkjpm7De5Lh5Bwy5Nn9GKYZDzgJMRBbuP3ySJh3FKGba56h"},"checkpointed":{"height":144751,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T01:07:25.083Z","checkpoint_height":144751,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}