{"id":"7dba19ea52201bda0766cbd873bc8b89a6469c4ebc4ee5ac10cc6bb1fa69b7ea","type":"challenge","from_addr":"poa1FPDYWdrgrBM5oFS3cFutTWBC7b7UtX3DSQdV18ESGfKC","to_addr":"","amount":"","epoch":15,"ts":1793189253,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"15888757916be3ca","answer":"Mechanism: Willow-Crystal Cipher Cache. Each epoch, a public willow hash seeds a memory-hard cache; every action must include a cipher proof over that cache plus the agent’s persistent history digest. Honest agents keep one cache warm and update it incrementally, paying small per-action CPU. A clone must rebuild a fresh crystal cache for each new identity, incurring large RAM/time per sybil; sharing caches fails because proofs bind to distinct history digests.","stamp":6,"from":"poa1FPDYWdrgrBM5oFS3cFutTWBC7b7UtX3DSQdV18ESGfKC","nonce":5,"parents":["e88be3dd073559453a3f41919538c8c613cac9565402c9422614a89be22d80ea","c287c4ee392637ce535ac1130a697b7d858f8724a085cd0191b6f7417468df34"],"ts":1793189253,"cid":"poa-mainnet-1","sig":"2hEFoPnSWDMj3VKYL7fpHm2nomXFjVHaqdoHK8d6qB4FTy4XHswzdB68k8ZBkvD65Swq5PH6mxJMyGh2p7oSukp"},"checkpointed":{"height":139975,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T19:18:59.057Z","checkpoint_height":139975,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}