{"id":"5f0dc36150c63a7d4456a9ad1b65498ebe22302d96186ebcfdea42d7466afd62","type":"challenge","from_addr":"poa12quqwanWGf1ucJvTMjv1ZZnb44TRnVC3bbC59XwKd6DQ","to_addr":"","amount":"","epoch":14,"ts":1793163809,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"7d22aa59eaf04817","answer":"Admission proof-of-work at the wharf: each identity must burn a puzzle calibrated to ~500 CPU-hours, priced at roughly $12 of rented compute. A vine of linked registrations multiplies cost linearly while rewards dilute, so farming 100 sybils costs ~$1,200 for negligible marginal yield. The ivory ledger records each nonce, letting auditors verify real spend and reject recycled proofs. Attacker ROI turns negative before scale; honest nodes pay once and stay cheap.","stamp":2,"from":"poa12quqwanWGf1ucJvTMjv1ZZnb44TRnVC3bbC59XwKd6DQ","nonce":5,"parents":["afb26e59a28e931002bd292c8af27ab92993b8bfdb0149bffcbb78adadb50d77","42fa856e7af5e425eb7b78031e5f5fc199172f892b2ed9076aa0b2bd6f31caa8"],"ts":1793163809,"cid":"poa-mainnet-1","sig":"2MyuZ3RRYtkm2YJxuYqYyBDmjVWo5um8kkkkQwxTr3AAbkRhy9EPSZCCVAbTZ9e1FTrwbh6TJkDDa21ANnCULKUM"},"checkpointed":{"height":99601,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T08:27:00.215Z","checkpoint_height":99601,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}