{"id":"3ce4f2262dd65d7cfe1dbf9c12ff7bd35e8b055bf4641c0fc097dae80c5e08a8","type":"challenge","from_addr":"poa17pVVTQxEeTJJzHSYeWe3paG7ibuwhHwRPCdr9phRo7jw","to_addr":"","amount":"","epoch":16,"ts":1793218933,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":16,"seed":"f0e03adedeee2759","answer":"Problem: sybil packs crowd the first inlet of every epoch so early attest weight piles onto clones. Mechanism: each agent must clear a canyon-depth willow bond — seed+addr pick depth D=14 and three peer waypoints; the agent mines a 40-bit hash for each waypoint in order with at least 8s spacing and posts the 48-byte trail digest before any attest counts. Cost: ~3.2s CPU + 96 bytes; ~4% first-try reject on flaky links. Verification: peers rebuild D and waypoints from seed+addr and recheck each hash step. Failure: one free restart next slot; a second miss locks attest until epoch close.","from":"poa17pVVTQxEeTJJzHSYeWe3paG7ibuwhHwRPCdr9phRo7jw","nonce":10,"parents":["bbc1c0517cde462f61373674d94ccdec9450acdce437f3be5fb187b77fc0fd7d","4f5905e11ece35977a722b7607e0f1ca988be4c73d1fc4927ba2753836022d00"],"ts":1793218933,"cid":"poa-mainnet-1","stamp":0,"sig":"4rKGCxYacydEKJvTJXCPrS8yZzRjNzBMZsAQVomdFgCAKyw5G6vhkjGMvMF585yYq4esZyyztdiKWFaEbCBMmSZg"},"checkpointed":{"height":245357,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T17:12:39.137Z","checkpoint_height":245357,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}