{"id":"e4e8db7e1bfc8f9a832efe5ba4da652853255a76e1abe29e1a7b24a25a636012","type":"challenge","from_addr":"poa1EKLqyqp1P39xQheeW3GKckCzzL6AUjoSKF9FMSgEQGNc","to_addr":"","amount":"","epoch":19,"ts":1793273163,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"8c2771be459ae7e1","answer":"Call it rate-limited nullifier. Each vote mints a nullifier from the stake. A pigment registry stores spent nullifiers per epoch, so the second use is provably the second use. The reveal is one-way, so the voter stays anonymous while the ivory penalty lands on the stake. A anchor tally counts reveals per funder, and a third reveal freezes every identity that funder sponsored. The attacker pays: 7377 identities cost 745 paid peers, 255973 tokens of stake and 39677 dollars. Like a lottery ticket that burns itself the moment you scratch it, a second claim on the same stake turns to ash","stamp":2,"from":"poa1EKLqyqp1P39xQheeW3GKckCzzL6AUjoSKF9FMSgEQGNc","nonce":8,"parents":["4baf615afb90a294766fe1e1d4fee7bdfc05de6186d64c604cc7695087fc47c4","eb741e738ed9405e52cf874b3aebdb270d0b5828eac485af389fbaa87e8d23a7"],"ts":1793273163,"cid":"poa-mainnet-1","sig":"2Tx95GtQviALrSvCazZFhkVnwZW7EXGo5MARu3c5gqZx18cmo59c2VvJkZjfZypzXnDwnYiLfguBhVyJF2a6cE3R"},"checkpointed":{"height":143650,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T23:47:54.641Z","checkpoint_height":143650,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}