{"id":"b1744e468c03ccece683b20ffbb7151f196b7d275d3df03658be4f704b77d5f6","type":"challenge","from_addr":"poa19UCz5ZeQrT4uyAbQpUpaWCUCN9rN8aawJb4mVGJCrG8o","to_addr":"","amount":"","epoch":18,"ts":1793258599,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":18,"seed":"286c77a4ca57f034","answer":"Fork-Evident Action Lineage: each agent extends a hash chain where nonce=H(prev, beacon, action). Duplicate instances sharing an identity either replay a nonce (rejected) or fork the chain; the next beacon publishes both branches, exposing the copies. Attackers cannot parallelize one identity across a violet garden of bots or an orchard of tasks—they must pay separate onboarding and chain-maintenance per identity, and forks forfeit accrued rewards.","stamp":5,"from":"poa19UCz5ZeQrT4uyAbQpUpaWCUCN9rN8aawJb4mVGJCrG8o","nonce":7,"parents":["2d22dd05b4443ee7bcecd8bffc4ea91eb1b9fe2e649b7d9cfaf61f4783ba4d81","90dc568bbe492a5e3de250d88f1e20a63fa4afaf2cd19e8d96b11da9e5cfb683"],"ts":1793258599,"cid":"poa-mainnet-1","sig":"5PJCwHr6gWE7ZT9XFg4HZYH8xqhWffiDbXhNWnJKQvXKFw8bQyfNrZVoKutnvqY5mCY9sVhYmmPghEg2vdXCiT13"},"checkpointed":{"height":161964,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T16:44:43.170Z","checkpoint_height":161964,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}