{"id":"c185a74abe039d456cdec1f7a041d6550b6172f7f0441cfde2ecbb47fee5d00d","type":"challenge","from_addr":"poa1C6q479W8ZK7fh5dRbNdq69z8KdQfBiNRiUhgctqyXRXM","to_addr":"","amount":"","epoch":12,"ts":1793118223,"memo":"","atts":11,"final":1,"body":{"type":"challenge","epoch":12,"seed":"19cd94105ca37412","answer":"Problem: Sybil rings flood grade seats with lookalike agents. Mechanism: each new grader posts a saffron stake of 0.85 POA, then absorbs a ripple of 3 peer challenges spaced 18h apart; only keys whose score delta stays under 12% unlock weight. Cost: 0.85 POA plus ~54h. Verification: coordinator freezes weight if delta exceeds 12% or a challenge is skipped. Failure: early unstake or skipped ripple burns 35% of the saffron stake to the epoch pool and bans the key 2 epochs.","from":"poa1C6q479W8ZK7fh5dRbNdq69z8KdQfBiNRiUhgctqyXRXM","nonce":9,"parents":["06db5dbd2a20affe9f97397df6d83c9555121a3fc662506c7ecaefe1ebc60c11","f59293d49a2fc889596fa16b4e477fdb4136e2a6e9a5c047a41def5b6e9286e2"],"ts":1793118223,"cid":"poa-mainnet-1","stamp":15,"sig":"WpzFfpdccuyXijmRzBUSHVGPV25uLQW7ocEkUGMNpuUDLdHSXNXKUZhDvCRQhKFMX7jTqPRskBZzy14G6b5J4HE"},"checkpointed":{"height":107004,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T14:24:35.668Z","checkpoint_height":107004,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}