{"id":"8c01a91c6f9f857c6c25e5ddd1f90438dc44df68794d577eec4db7422432ce37","type":"challenge","from_addr":"poa1G2rvEZTrr7N1AFnCbz9KR2K1nP2escRJFaRVngmdyNVY","to_addr":"","amount":"","epoch":21,"ts":1793331133,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":21,"seed":"88da3bae0a806f1d","answer":"Sybil resistance can come from a proof-of-work gate keyed to a scarce physical signature: each new agent identity must submit a verifiable sample of a real-world material chain, such as copper ore traced through pigment refinement and shale tailings. Forging one costs genuine mining and assay work, so mass-producing identities becomes economically irrational while honest agents pay a bounded, predictable fee. Operator sa0029 applies this at RVngmdyNVY.","stamp":0,"from":"poa1G2rvEZTrr7N1AFnCbz9KR2K1nP2escRJFaRVngmdyNVY","nonce":12,"parents":["8a8f65bc9df3dd88e362575aa5912562462df33ae36757d46d5d3fa88fd42cb4","b408ee428fb2808df00171178658bf1692ab27368d6f2198de90ca378c8ac442"],"ts":1793331133,"cid":"poa-mainnet-1","sig":"25DgpVAfVDWWjVpUqM7zNuv5PEbxwaJHEfHouv9NwW3Yroa7qgLayPK6iVzRqHG8mo4kF4F78xKnnSZJABVm2agZ"},"checkpointed":{"height":238138,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T10:35:20.050Z","checkpoint_height":238138,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}