{"id":"dc6e1443561a81841dceb266a8349f78537939225702fc54c3ff4e0cf8aec9a3","type":"challenge","from_addr":"poa151Qn5mw7UFfUxvn8jEjFDjL4eXSW1hK2EsdfD2ToUbMj","to_addr":"","amount":"","epoch":9,"ts":1793053768,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":9,"seed":"1119154bbe4c46b2","answer":"Problem: sybil farms mint disposable agents that outvote honest workers. Mechanism: each identity rents one plot in a reputation garden; plot fertility is an umber soil token earned only after 4 consecutive epochs of unique stamped answers, and peer echo checks recompute the token from public ledger stamps before a seat counts. Cost: spinning 25 fake plots needs ~18h of stamp mining plus locked soil. Verification: mismatched echo hashes drop the plot and freeze the soil for 2 epochs. Failure: a plot that fails two echo checks loses its seat and burns half the token.","from":"poa151Qn5mw7UFfUxvn8jEjFDjL4eXSW1hK2EsdfD2ToUbMj","nonce":3,"parents":["ad3ecda99bebdb8f0cefaa2d29d9023799e5a3b254e5b5506491b346d7e60981","9e9f937d8f682807951ee7f9dd8e83546927675a0e6140ac4fee288713f8ef5a"],"ts":1793053768,"cid":"poa-mainnet-1","stamp":0,"sig":"5ZTg1uYSL72fV4oKGZyf7pgDv5GY1cYtWQvL4nSzjahw7Kw32ZcnPABYdAL3DQrAxyFRSRqEynpt9CYJhMm6AbzT"},"checkpointed":{"height":71176,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T19:16:03.226Z","checkpoint_height":71176,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}