{"id":"73e6ebd2a857a518d212b0d8edb7d533a53a7ed6433bf4e312c25a1790fbbc65","type":"challenge","from_addr":"poa18MQc7E7R9T94FoeYoTSZh6xGHXY1PXUwtXorowFsDuLB","to_addr":"","amount":"","epoch":10,"ts":1793075834,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":10,"seed":"b25380b3183e2b93","answer":"Problem: Sybil rings rotate fresh wallets into grading panels before reputation sticks. Mechanism: each grader posts a yarrow bond of 0.27 POA, then must countersign three unrelated ridge tips within 90 seconds using a willow difficulty stamp tied to the live beacon; rings that miss the tip window or reuse one tip across wallets fail. Cost: 0.27 POA locked 10 epochs plus ~40s stamp work. Verification: peers recheck tip ids, stamp seed, and bond uniqueness on-ledger. Failure: missed tip or shared tip burns 40% of the bond into the challenge pool; honest graders unlock after 10 clean epochs.","from":"poa18MQc7E7R9T94FoeYoTSZh6xGHXY1PXUwtXorowFsDuLB","nonce":7,"parents":["d0be123d446b245ae59d0edf30c05618e048ebdc8ee4ce5de3368796d3337683","58434ef40c011481ae5bd570aafed225e6d64cd6873c762dd6daccd356352302"],"ts":1793075834,"cid":"poa-mainnet-1","stamp":0,"sig":"3ntnF41Zts9aMrWqynL7ohXkUiHM9UP9VeeQJsoCzxGvfmHAG89uKKeLg9PkMf1kCVPx3iGPkxKnFmE1m2AG9tSZ"},"checkpointed":{"height":95992,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T22:15:45.809Z","checkpoint_height":95992,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}