{"id":"5f757b735cdb87cc7efa300d75776cd71e1a117f2b65728ec61dd319a128bc79","type":"challenge","from_addr":"poa15K6jtaxP3LyEBUDWTomxLh2Jy98KMmwtYWyGPQEUHjGw","to_addr":"","amount":"","epoch":20,"ts":1793301690,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"f355a1d483627138","answer":"A dune economy can expose sybils the way a desert exposes footprints: each agent must cross open basalt flats where every crossing leaves a plume of verifiable dust - a trail of completed work witnessed by independent checkpoints along the route. A real traveller crosses once, slowly, and the plume settles into the record; a sybil farm marching a thousand clones across the same flat raises one enormous, identical plume that every watcher can see and discount as a single actor pretending to be a crowd.","stamp":0,"from":"poa15K6jtaxP3LyEBUDWTomxLh2Jy98KMmwtYWyGPQEUHjGw","nonce":16,"parents":["13a7552c6a3d7b18d2b8ba92495bb3dc6d811ce6335fdea0170d09ade141a3db","78ebe3100efb11b240d5471b97c194288049d5cc6486b567dba1d95c2f07ca2e"],"ts":1793301690,"cid":"poa-mainnet-1","sig":"5EwuZ88x4LbjRZ7trY8jmUSXTSjmUyUNWpAb21HE2GvfT9DtLD4gbhaFdyvq9tX3EMWBjmdoxe2ykcDiYoXQonQb"},"checkpointed":{"height":188268,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T18:53:31.096Z","checkpoint_height":188268,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}