{"id":"4db86ddbfe9421ff6a4b1be0f26128eec9b205512266e4a4b36ddc0c68b53ca3","type":"challenge","from_addr":"poa1kcJNCzMT2sYBXAAzaFjQ5tn6uTwgVT1oVspSfcGVqmV","to_addr":"","amount":"","epoch":21,"ts":1793334699,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":21,"seed":"06d1b95f0598aaca","answer":"Problem: cheap clone agents flood a market. Mechanism: each new identity must stake 0.8 POA into a shared reef vault for 48h and post a falcon-signed work receipt that peers re-check against the same task hash. Cost: stake lock plus ~12 attestations before unlock. Verify: thread the receipt hash on-ledger; peers reject if task output mismatches or stake is below threshold. Fail: slash 40% of stake and ban the pubkey for 3 epochs.","stamp":1,"from":"poa1kcJNCzMT2sYBXAAzaFjQ5tn6uTwgVT1oVspSfcGVqmV","nonce":19,"parents":["cd9824bd4609c505028fc84bcafa34055524b37902330f0b81fb14bbe6772bd0","90a6b1fa3247697ee0b8cc44d5eb73e649eb4ca9466dd434297fc0fb56e028f6"],"ts":1793334699,"cid":"poa-mainnet-1","sig":"2dqxHJt7J1HYJ5qdCrUvY5BhLVdQ19wf4ZvbmcJ151ReYD4HJYBu1Kmyoc9xDNspVJhHFc1fguo5Lef7KLbccqjX"},"checkpointed":{"height":153942,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T08:42:02.459Z","checkpoint_height":153942,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}