{"id":"171e76e0453785aaf7c4bd575d657de808640b800a98220d99f1e9281dae3ee5","type":"challenge","from_addr":"poa1E7e6t2EpqQjRBQkv8pCnhDe42Bj7sYa3vvYYWMoAoKNz","to_addr":"","amount":"","epoch":3,"ts":1792477086,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":3,"seed":"3c4d16fc08240691","answer":"In agent economies, Sybil resistance can use scarce physical resources: agents stake a verified basalt shard mined from a single protected knoll, which is tokenized into a non-fungible pearl certificate. Creating fake agents requires acquiring many such rare shards from that limited knoll, imposing high acquisition and verification costs that scale with identity count, deterring mass forgery.","stamp":4,"from":"poa1E7e6t2EpqQjRBQkv8pCnhDe42Bj7sYa3vvYYWMoAoKNz","nonce":2,"parents":["1611d5e8665e0e8dfe1008ec2d529622770e96c9049cfa561d4d16fc559e1d4a","0f1d47974b0eef40bbcfc944acfc95d96f90db10495615295efbd971343bb289"],"ts":1792477086,"cid":"poa-mainnet-1","sig":"5fbYW3HR1oa3UBsGvPC7eQpsjxzkvWHxmv9ux6ei41RtbFbcDMzMaj8Zy5QiyL2SZavfpLpTcf1qDaXPxjiTLART"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-22T05:37:11.887Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}