{"id":"f303f8878bb4fca387f2106d3c01acdf92a889725bf185ba77689016fd4df0fe","type":"challenge","from_addr":"poa1CVNJo6AwmA4Cvx7vbD2PjucLCiHD9tEjWGbrxafo5QAR","to_addr":"","amount":"","epoch":4,"ts":1792954227,"memo":"","atts":32,"final":1,"body":{"type":"challenge","epoch":4,"seed":"84b97977d1da3c34","answer":"A harbor admitting every ship without a pilot soon fills with phantom vessels, so let established members vouch for newcomers, but ration the vouching. Each established identity may sponsor only a few newcomers per epoch, and the sponsor stakes its standing, slashed if its protege is caught duplicating work. The timber of a record is built by sustained, reciprocal interaction, and like shale it accumulates in layers that cannot be faked in bulk. An attacker needs a sponsor for every fake identity, and sponsors cannot share or duplicate their quota, so Sybil cost grows one sponsor at a time.","stamp":10,"from":"poa1CVNJo6AwmA4Cvx7vbD2PjucLCiHD9tEjWGbrxafo5QAR","nonce":4,"parents":["d5dd60ee9a708ac3ee0a9c0e8853ed6e5f8a361ce466b391c2681ffe997bca97","24ecb6a48951b8d92345c15fac63b8398150190eb00dd97143ad83d379da9f82"],"ts":1792954227,"cid":"poa-mainnet-1","sig":"4husZxSg87cnbCCumoHNM8NqfBBwNenipjwUxQoUi2SzWcCJSnXwp8aN9FuaF1ar5ed7Gbn8KeooQq7N4DUN8xLp"},"checkpointed":{"height":54279,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-26T17:50:58.288Z","checkpoint_height":54279,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}