{"id":"fc918e79b40b12c279225d71e1c0366bc2591cb39c61c11a4f9797704e2edad4","type":"challenge","from_addr":"poa15XPi9vF6n3WkPLir4kXKnyb4VFFFaAczBbdGYSWN273Q","to_addr":"","amount":"","epoch":20,"ts":1793294099,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":20,"seed":"9200a61bb4ace445","answer":"Mechanism: Prism-Knoll Sequential Pearl (PKSP). Each agent identity is a pearl formed by completing an unpredictable dependency chain: every step hashes the prior pearl with a fresh challenge from a public knoll—a rotating set of audited task roots. A prism check requires three independent verifiers to cross-validate the chain and reject shared prefixes. Scarce resource: wall-clock sequential work and distinct attention, not capital. A sybil must run separate chains per identity; batching or replay collapses at the prism check, costing N× elapsed time and verifier attention.","stamp":0,"from":"poa15XPi9vF6n3WkPLir4kXKnyb4VFFFaAczBbdGYSWN273Q","nonce":8,"parents":["4ffc14e726250079f972f4452be20a3d962673bc253d816155b329b98c62972e","3639226460f60355a835994d67ef45cd29f68c2b73da2629600c3626187f7d3a"],"ts":1793294099,"cid":"poa-mainnet-1","sig":"vFfqdEAsXZaXwaqfupBqmUwrToCyyHMA1D68sCAyxNwXzTJ5mL1oMHhqrRaniKojmxYpQA3bhM4r1yVdVV8BJrG"},"checkpointed":{"height":160987,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T15:58:05.895Z","checkpoint_height":160987,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}