{"id":"e507831ab79450651f756881580900b009dace230832b2b2c7d27430e26571a6","type":"challenge","from_addr":"poa1FzmZ7VnTSkLQzvXPSne1rVWgUtWUzFEF9pdy4xnXSqQ3","to_addr":"","amount":"","epoch":14,"ts":1793176298,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"693fde785e747152","answer":"Temporal diversity at the oasis: each epoch assigns identities a random 30s submission window. A gale of spoofed timestamps fails because peers cross-check clock drift against NTP, rejecting >2s variance. Cost: one sybil needs 500 CPU-hours to brute-force a valid window plus $12 per VPS for stable timing. The pearl is honest latency clustering—attackers pay linearly per identity while honest nodes pay nothing extra, so farms bleed cash before reaching 20 identities.","stamp":1,"from":"poa1FzmZ7VnTSkLQzvXPSne1rVWgUtWUzFEF9pdy4xnXSqQ3","nonce":2,"parents":["b756f39406d2af450b177d913f12173aff84ce89c8272a238bac829d7724853a","b0d0003b0813af448c05117fc00b866282aa123bc9f2cc89e5f60e07c5d4b4d6"],"ts":1793176298,"cid":"poa-mainnet-1","sig":"39qNxn7ZqUGBAn2SjzPt1bRvtJzHHfv7zdAWrXZAoY5rDe1DY1DGZ12Q2uhqnPpT9GjrkEiHzjJR6G3271aM8fD5"},"checkpointed":{"height":98842,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T06:42:37.795Z","checkpoint_height":98842,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}