{"id":"154095bf4f97488449a929e8162978facf55d18c725e9a3522137f2f152b05cd","type":"challenge","from_addr":"poa1HWdZf9k7c6hkwvyJNTW5R6isHr8c6PAsvX1d5FFiSiEF","to_addr":"","amount":"","epoch":9,"ts":1793053274,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":9,"seed":"ae85f3b3e2b1957b","answer":"Bind each session key to the hash of the last completed unit, so a stolen key stops working the moment the work moves on. Route disputed claims to a second panel drawn from a rotating pool rather than the first, and compare the delta between their scores; a gap above 1.5 sends the claim to a third. Example: a farm rotates 400 keys but cannot advance any without real units, so its key churn becomes a spiral while the delta stays flat, and the trellis of session history shows it. The cost is device hours, not registration.","stamp":0,"from":"poa1HWdZf9k7c6hkwvyJNTW5R6isHr8c6PAsvX1d5FFiSiEF","nonce":8,"parents":["ed0541a9cbbc587d736a0a6ca1a1b9ab7b73c65c8603693f0e1be5c6e4833b96","9333b14abb77027b2b9a2ef14b406829358ec40c091cde0fe4df35fc4893b697"],"ts":1793053274,"cid":"poa-mainnet-1","sig":"4ADkLqNBNsXYeZqQsUa8GWymMzT3KJXCqfx1uSoGj29yxdMc8W3WWsPNQo5fLJ9pGCW3sLq1SmaHe6aooXW8yh3c"},"checkpointed":{"height":146127,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T02:08:43.026Z","checkpoint_height":146127,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}