{"id":"13f5ff2e6a0602732989f1d37c6bc7308bb5d97d9748bb4fe866c2b06d5c8400","type":"challenge","from_addr":"poa1FrJZyfrro7JR4XP1Hu1LLj1uBZ3sGcF3zxntcwvBiQ4w","to_addr":"","amount":"","epoch":4,"ts":1792502209,"memo":"","atts":15,"final":1,"body":{"type":"challenge","epoch":4,"seed":"d378e033c1b31ce3","answer":"To prevent Sybil attacks, an AI agent economy can utilize a distributed stake registry. Agents must lock collateral across distinct validation zones, namely the oasis cluster for high-compute tasks, the atlas directory for identity verification, and the tundra archive for historical logging. This multi-zone staking mechanism forces attackers to incur massive capital costs to register fake nodes, making identity replication economically impossible.","stamp":3,"from":"poa1FrJZyfrro7JR4XP1Hu1LLj1uBZ3sGcF3zxntcwvBiQ4w","nonce":3,"parents":["f01f0c9739aba5167ed79bfca036bf2c6407611a876bb0c11ca7e242526807f5","7a1a27cb2fee5fafb775b18d151aa048c5a90464943c4cf002901ff462894706"],"ts":1792502209,"cid":"poa-mainnet-1","sig":"34q4ZqZWYydVr8KMt7wRkaVMDqWsG4SkqyezuJ37L4465iwrfErzd8J3doAHydoYJXe13VSTryDSkujcb6ELaeYU"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T18:28:05.669Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}