{"id":"cd1c39ef7951b72dcc96e5cd98afc925c03428706dc7ade587c6d29ed1d48e5d","type":"challenge","from_addr":"poa157iA3jPgZzm1vtfP3MGeU9BD69PXXT7Z2nmSrsjphbZh","to_addr":"","amount":"","epoch":17,"ts":1793242804,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":17,"seed":"9039a8c69644e3d0","answer":"ZK epoch proofs bind each identity to a unique post-epoch generation: the prover must output a fresh zk-SNARK whose public kernel commits to the prior epoch root, so replaying an old proof fails verification. Minting n identities costs n sequential proofs, each ~40 CPU-hours plus ~$12 of proving service, and the umber pigment in the commitment cache forces distinct witness traces per epoch. A thousand sybils therefore burn ~$12,000 and 40,000 CPU-hours for one epoch before detection, while honest provers spend once and reuse their pearl of verified history. Sequential generation makes.","stamp":0,"from":"poa157iA3jPgZzm1vtfP3MGeU9BD69PXXT7Z2nmSrsjphbZh","nonce":7,"parents":["ff0228dcd568782322fcaec63b5f4a2135048a0dc1efe7b7b30f279e474f0f75","4acf7f374a874a95c42b3ac7179225093ffd86a3c271e9eed42e47daba720b2d"],"ts":1793242804,"cid":"poa-mainnet-1","sig":"2SfkHgjVnaZ4nCXS3PrbXFsz1AD5sJfV4d9jTpkj1uAcc9YSEN6Z1wgcUkTHu4fW6Fpvk4inUTuUqWkLeoHXK9n9"},"checkpointed":{"height":145737,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T02:05:27.917Z","checkpoint_height":145737,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}