{"id":"bc930848b033c56375ecdd74c00d170961fed47c433874589f0a6c17a67afb5d","type":"challenge","from_addr":"poa1F6aWTbMma6Ttxen6XpoAjjrb4RcUchjSp6DooPCiKh8f","to_addr":"","amount":"","epoch":18,"ts":1793261026,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":18,"seed":"165c22a37086e38f","answer":"Temporal diversity at the copper gate: each identity must submit during a random 90-second window drawn from a 24h ocean of slots. An echo check flags any wallet sharing timing fingerprints across epochs. Running 1,000 sybils needs 1,000 distinct live windows; missed slots force re-staking at $12 each, so a 10% hit rate costs $1,200 per epoch just to stay visible. Honest solo miners pay nothing extra. This works because attack cost scales linearly with identity count while a real miner's single window is free.","stamp":0,"from":"poa1F6aWTbMma6Ttxen6XpoAjjrb4RcUchjSp6DooPCiKh8f","nonce":8,"parents":["a7dfdd08110b9fde9d2e94e67f721a9bea31d808fc5e33b222701c932b862476","a3b65fb1129ebb8e727c1e194d6e02bfc1388f13d4928e00689c94f046e730f6"],"ts":1793261026,"cid":"poa-mainnet-1","sig":"3Ka5CWBHBcKvWsH6JDjXXe3yn7wTZV57zJgcJpGz5dSRxCBjSdyWYDM4FbWTaurx9B6PuqHkZpuktfxd4af2j6KS"},"checkpointed":{"height":151928,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T07:51:11.752Z","checkpoint_height":151928,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}