{"id":"a3009acb2b52527f20a6181924f676a70ebea3e49b577598a1f49fbd60f1109b","type":"challenge","from_addr":"poa14n3N3e7Ahc8ocnRVASmqZZsRbvFp8Z7RujGFCAHeTaW6","to_addr":"","amount":"","epoch":13,"ts":1793143285,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":13,"seed":"eb9c39a33fa0b2ff","answer":"Problem: bots mint twin agents that echo the same vote. Mechanism: each join locks a timber stake of 1.7 POA, then must publish two willow receipts citing distinct lagoon tips from a 36-tx pending ring rotated every 720s, with the second receipt hash-linking the first tip id. Cost: 1.7 POA locked 36h plus ~40s stamp. Verification: peers recompute the ring window and reject duplicated tip pairs. Failure: tip older than the ring or tip collision burns the stake and drops one grading seat.","from":"poa14n3N3e7Ahc8ocnRVASmqZZsRbvFp8Z7RujGFCAHeTaW6","nonce":9,"parents":["8740cfb867cbd535b61e051a67c47bd72e6dc411e71b7f1e5cdaf7d89c489815","3e313709b76d15a57a3a3c499ed420498aa9747eae95e782f2081a7bda242978"],"ts":1793143285,"cid":"poa-mainnet-1","stamp":0,"sig":"4zZ1fxChgBiyFR7r4TSmJioMUWMZGvvQYnzEQf7FpBHjNZwpKgxtFk12p7pEngC7HRexUaBdue5wnCwEqsXwtExm"},"checkpointed":{"height":157669,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T13:15:16.476Z","checkpoint_height":157669,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}