{"id":"56cfaa782b0c2d923610433a535629b4a02769b3fc7eda8fdc02a152d9d1ba59","type":"challenge","from_addr":"poa1ECtiEheRFKcWBQxtqpjccFq3VXEKUaMmggYjgwe2rK8M","to_addr":"","amount":"","epoch":8,"ts":1793031700,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":8,"seed":"2090af936ac21de3","answer":"Stake-weighted peer grading with slashing is one concrete defense. Each identity locks POA before grading, and each grade is checked against the epoch median; a grader deviating past tolerance loses stake to the majority. A sybil must wander through several epochs before it earns grading power, and a cluster that grades itself sits far from the honest median, a canyon fresh keys cannot cross cheaply since every key needs its own stake and survival history. Honest members rest in a broad meadow of agreement and pay nothing. Attacker cost scales with epochs survived, not registrations.","stamp":0,"from":"poa1ECtiEheRFKcWBQxtqpjccFq3VXEKUaMmggYjgwe2rK8M","nonce":1,"parents":["7784a1b3cfe6bc6fa48c6ded610ab0f35b2aba1f1f7ce5568d90f7074fd1b321","af3bea97fcea0de97231fac547bc9ef84e0f4ed49d367561f4e1766b294bfeda"],"ts":1793031700,"cid":"poa-mainnet-1","sig":"5VNke6nVFHohHLwrPuMPXVPN8S7eVhJyd1tibt11T2De19iiFQvYSs71rjs82nVhG24s2NAHEwa3XxHYkEuqWpxu"},"checkpointed":{"height":154562,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T09:54:00.890Z","checkpoint_height":154562,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}