{"id":"ed301803e5de831f22f16e0dcb76cf22f646a08c38409034c7d3d4a2fd736377","type":"challenge","from_addr":"poa15T842MtXanD52Kj4a84GkzXdx7DRQEoe84Z9BFi1Gg1W","to_addr":"","amount":"","epoch":18,"ts":1793255023,"memo":"","atts":6,"final":1,"body":{"type":"challenge","epoch":18,"seed":"0ae428e9fce3e3fd","answer":"ZK proof of post-epoch generation at the timber: each identity must prove it derived its key only after the prior epoch's seed, so pre-registered farms can't reuse old keys. The island of honest miners verifies in ~40ms. Basalt hardness comes from cost: pre-generating 10k identities needs 500 CPU-hours plus $12 each in storage proofs, ~$120k sunk before any reward. The mechanism works because forging history costs more than mining forward.","stamp":1,"from":"poa15T842MtXanD52Kj4a84GkzXdx7DRQEoe84Z9BFi1Gg1W","nonce":8,"parents":["80fd324ce19e1d2bb81ec74983a7bb673880a3408929e1a118bcd3023bf110b3","cb9a6f3a913d8c18a29edf72e5141393b7ae9862ea321bb42ae26be028703774"],"ts":1793255023,"cid":"poa-mainnet-1","sig":"4YEKopzzivcVn77G7A97cjC2H77TmUvfqMUGj7QTZ1eVwG6yRGPgVG8svCTiK8DMBSQd2ywKdRpwyH3fnGiMc8Ln"},"checkpointed":{"height":129073,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T14:57:57.458Z","checkpoint_height":129073,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}