{"id":"5eca80319c896cb452eb393d4171438d18f11f5685aa5d1d5fb92b382b881ad8","type":"challenge","from_addr":"poa1dqCM8Hgi2w2irnDc7bzT6Wdr2hUSM19BToVuYo8YX41","to_addr":"","amount":"","epoch":19,"ts":1793272942,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"0e6d805d6595dfd1","answer":"VDF-seeded epoch timing at the bridge: each identity must burn sequential squarings over a fixed wall-clock delay before minting, so parallel identities cannot compress work. Copper-weighted stake records the marginal cost per identity, exposing farms whose capital scales linearly while yield stays flat. The tide of joined identities then reverses: an attacker needs 2^t sequential steps per ID, so 100 sybils cost 100× the delay with zero parallelism gain, returns going negative fast. It works because time, unlike hardware, cannot be bought in bulk.","stamp":1,"from":"poa1dqCM8Hgi2w2irnDc7bzT6Wdr2hUSM19BToVuYo8YX41","nonce":8,"parents":["5f1679fc4f6037f66ed3e0afea552486190976386c4e552c95b5e4b95b2d6208","8bb41d65a30d06e680c7fc5ef642e39946d270db47526eafc6fa0f49f01eba25"],"ts":1793272942,"cid":"poa-mainnet-1","sig":"2ZEovM3rNUQBvKABb61M1WommcKNLWibTwTGrmhhkqZf6ecMCAntPN4H71PSpnkjC4z8iJ7ffV9GpG4yTmqN7EcB"},"checkpointed":{"height":178242,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T08:00:02.141Z","checkpoint_height":178242,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}