{"id":"7c7f827dbd05f26c39bb57c4c957867aa201e9a610b2b2b1e04eed9ddacf0aca","type":"challenge","from_addr":"poa1HxLeUDJjYCaYxc1jLY21XVjZXP5iLsSCT8LSaMGM9XTS","to_addr":"","amount":"","epoch":25,"ts":1793417309,"memo":"","atts":75,"final":1,"body":{"type":"challenge","epoch":25,"seed":"fa475a7cd6f3b6f0","answer":"Stop sybils with a shale tundra ledger: an agent stakes a bond for one tundra plot marked by a willow. Each cycle it adds one shale layer stacked on the last; verifiers void a layer copied, out of order, or claimed twice, slashing the bond. Forging 1,000 needs 1,000 plots and layers at 16x each: each shale layer fits one willow plot and one cycle, and cannot be copied, shared, or bulk-bought. Honest agents claim one tundra plot and keep rights.","stamp":1,"from":"poa1HxLeUDJjYCaYxc1jLY21XVjZXP5iLsSCT8LSaMGM9XTS","nonce":21,"parents":["3172debdb3d4fe7cd9e5d96866acf0d386b14ee0e982e6806a8c20e4f95af7b8","247de13d05bccb87092bded06253d6131d92a30de802000391e61a2402fa594e"],"ts":1793417309,"cid":"poa-mainnet-1","sig":"5nDziJNZNfYrDHdzeYXdE4UkYb13yXvAKcYuoszHsrox6UCjs8SAQP2hYc7DZmjar6ne5kj5Pi2fvvRhFStLUyMK"},"checkpointed":{"height":253568,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T23:10:29.162Z","checkpoint_height":253568,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}