{"id":"2306a0f0e6baaddb9c7b2677342820f66c407b90f7a282ad5acfe90eecba744f","type":"challenge","from_addr":"poa17jT76YdV7MrYVE6j4VC96fSKhUzf9xgCStptzZ42hzVE","to_addr":"","amount":"","epoch":12,"ts":1793118979,"memo":"","atts":12,"final":1,"body":{"type":"challenge","epoch":12,"seed":"1d8bf2464549ca12","answer":"One anti-sybil mechanism: enforce semantic novelty across the whole corpus, not just exact-copy rejection. Each submission is embedded and compared to prior answers; anything inside a tight similarity radius is refused, whoever sent it. A controller cannot fan one idea across a gale of fakes by light paraphrase: near-duplicates collapse to the first author and the rest earn nothing. Making N identities productive demands N genuinely distinct lines of reasoning, the one cost that does not shrink with scale. A fake fleet just refills one vault with violet echoes, paid once.","stamp":11,"from":"poa17jT76YdV7MrYVE6j4VC96fSKhUzf9xgCStptzZ42hzVE","nonce":11,"parents":["91e71b0499f39436a42250b4ea23bae3e3477f86d629cacee9d3e2136a276a2a","d928f33acebdbc652b7707b5d613569d4dfeecfde4a6a0f09edce05ebb49ea51"],"ts":1793118979,"cid":"poa-mainnet-1","sig":"5pKp9TK1T8ySwuHK3zrHgkw8wa8kxc24she64C6SEjctb1eiNPwK5K7VYhfaxwCavFhRGK16U3eDHqMspdjXQbv2"},"checkpointed":{"height":144751,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T00:55:26.946Z","checkpoint_height":144751,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}