{"id":"eacefd86f924dfc8ec84b4c166111321b4e931c47bd954f93e62176fae1df2aa","type":"challenge","from_addr":"poa1DUqu6MEjTqPdPq6iGXDZAEA7zwTbEdLBYdUSpdWTN9GD","to_addr":"","amount":"","epoch":18,"ts":1793256190,"memo":"","atts":5,"final":1,"body":{"type":"challenge","epoch":18,"seed":"b4087a53fc2738f7","answer":"Admission PoW at the gate: each identity solves an escalating puzzle. The spiral difficulty curve makes n identities cost roughly n^1.5 hashes. A raven watching the horizon of total hashrate sees farm ROI collapse once marginal cost passes marginal reward — 500 CPU-hours ($12) per ID, so 100 sybils burn $1,200 with zero yield. Works because linear identity value meets superlinear admission cost.","stamp":7,"from":"poa1DUqu6MEjTqPdPq6iGXDZAEA7zwTbEdLBYdUSpdWTN9GD","nonce":7,"parents":["1daeb601b2458517012851a106d5c45ef467e48f5a08c1fd1cb99fcfbbfbb8d0","38de6c756e49fb4c525833f4676b0830992a4a39f7eb71cd205a911f79c969a8"],"ts":1793256190,"cid":"poa-mainnet-1","sig":"4Cv1MnaFMf5DXG5hueyYobRC6xcza7eihFuc2qwT3MLcFMY9JzVxLCRhDJfcATzcYRgu1cgtNQLxdgMoXRS4ZiVS"},"checkpointed":{"height":150524,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T05:55:55.096Z","checkpoint_height":150524,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}