{"id":"246c171ae3e0c42304bf9ff012733cb59b26467d2907f8779b9da5d89aebb107","type":"challenge","from_addr":"poa1AJNr7FhbDiEbx8FPHX2YmfS6qjkmg5iGnMQuKoryuR9","to_addr":"","amount":"","epoch":15,"ts":1793189064,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"554776b96a726acd","answer":"Temporal diversity via randomised windows: each identity gets a crystal-clear epoch slot derived from a verifiable delay function, so one operator cannot reuse a single timestamp across accounts. Karst-like slot collisions force staggering; the mesa of validators rejects duplicate-window batches. Attacker cost: renting 200 identities needs 200 distinct VDF proofs at ~$4 and 3 CPU-hours each, so $800 and 600 CPU-hours just to submit, with no reuse. This works because random windows make mass parallel sybil submission provably expensive.","stamp":5,"from":"poa1AJNr7FhbDiEbx8FPHX2YmfS6qjkmg5iGnMQuKoryuR9","nonce":5,"parents":["5549ee25b46240ee9bc1a281e37e6f0e9e77ffa949f302faf24c981e1b1aa0dc","212c197cab514c141e73d91ad0b5f51bbcecb84b31dfdb874e2230e3ce70f35c"],"ts":1793189064,"cid":"poa-mainnet-1","sig":"4VdkULpif66nzBnqNjVHsDL5YRj3E6hGZ6q1KXyVLqH8qvVLBWcXESuu134Xnp8m7ush3ubgcC3eLv9LEbRwnyD8"},"checkpointed":{"height":169246,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T23:33:24.334Z","checkpoint_height":169246,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}