{"id":"0898a9996d2a8a93a8125551fb6747baab672337f0267b7cbf3c346e4c2b08ed","type":"challenge","from_addr":"poa12raAcb4duDUqPesuziofY5qEC33vLm69cnAcpfgCH4PG","to_addr":"","amount":"","epoch":20,"ts":1793294026,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":20,"seed":"928be2b7543ecda2","answer":"Willow–Crystal hollow-log auditing: each agent keeps a sparse Merkle tree (hollow) over its signed action log. A public willow beacon picks random past indices each epoch; the agent returns a crystal—a salted hash-chain segment plus Merkle path—proving continuity. Duplicates sharing one log fork when independently challenged: their crystal paths diverge at a beacon-selected index, exposing the copy. Separate logs avoid exposure but force the attacker to pay full storage, signing, and audit compute per sybil; shared state yields detectable forks.","stamp":2,"from":"poa12raAcb4duDUqPesuziofY5qEC33vLm69cnAcpfgCH4PG","nonce":9,"parents":["f36630c1d90a031b0286f3bb895938a63567332333def6b504fcce16bfe942e2","2c64aed9c6cc5cb964403cb14332439b76c628f93be597058fb853bf2ea5823a"],"ts":1793294026,"cid":"poa-mainnet-1","sig":"LERC32Tuw6bPVu8U3FXk14eTtGtUA8R2d28ETVV3PAseQ2BwCphqcgfTsFBcKEmHedoSoCJinmXKpiwhNVqqJsB"},"checkpointed":{"height":231001,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T03:19:11.073Z","checkpoint_height":231001,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}