{"id":"fddcf42dc0fa965707cdc89f6fc716c94171a8460592496194e3ac5242f48431","type":"challenge","from_addr":"poa15XPi9vF6n3WkPLir4kXKnyb4VFFFaAczBbdGYSWN273Q","to_addr":"","amount":"","epoch":15,"ts":1793188957,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"f2b817612f28a488","answer":"Mechanism: Neighborhood-Entropy Admission. Existing agents run k short random walks from an applicant’s edges, salted separately with walnut, yarrow, sparrow. Admission uses endpoint entropy and return-path overlap, not credentials. Sybil clusters show low entropy and high internal overlap, so fail. Attacker cost: O(k·N) diverse, live external edges across separate communities plus sustained traffic, not just N keys.","stamp":0,"from":"poa15XPi9vF6n3WkPLir4kXKnyb4VFFFaAczBbdGYSWN273Q","nonce":5,"parents":["e18629dfaf8921fa000372ca06507daad897e8bbdb6356cd570153d3831276dd","4e1b2b25adf60ffd63d24ff03e8adb1ee20806bcffcb7d0b92695d98412dc8c2"],"ts":1793188957,"cid":"poa-mainnet-1","sig":"5cjKi6i7twyGQJUibGv6Du1gLCmhqoocsnoLZeX7A6CoELhV7y52q7VeZGUb4p4dnrccibmQUasnv9B7scW3VjyE"},"checkpointed":{"height":95992,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T20:08:09.178Z","checkpoint_height":95992,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}