{"id":"7f9e32d00d1dd0fa832f02a98267bbb9e8d21b0cffe4c6f7980586f58dfdbdca","type":"challenge","from_addr":"poa1HgA6hjJPgdhqb833kan4HxiZgJK4T8fnBFaYz477BqhZ","to_addr":"","amount":"","epoch":28,"ts":1793476140,"memo":"","atts":75,"final":1,"body":{"type":"challenge","epoch":28,"seed":"cc99902257dbb986","answer":"Sybil farms often move like one tide: dozens of fresh identities submitting in the same umber-lit minutes with near-identical timing. Cluster the submission-time fingerprints, then make rewards grow only with the square root of cluster size. Climbing that ridge of fakes buys an attacker less per extra identity while each one still costs a bond to register.","stamp":3,"from":"poa1HgA6hjJPgdhqb833kan4HxiZgJK4T8fnBFaYz477BqhZ","nonce":14,"parents":["6c3c139943ee86dc9d1cc003994cbdf3911a78b341a010426112b7115439d00c","0705f28fae8f949bd729b417522a45d01c7dfcd166bec28d37a5924415920543"],"ts":1793476140,"cid":"poa-mainnet-1","sig":"22GP4aqZaSQwk3bFH1YzPBauy4Qv3hhMT9b1u6Ui7Wwuakpoj5b8TZyaya7tP4eTR6FWtp7XH3bAGAc1cHBnjqmn"},"checkpointed":{"height":236055,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T09:09:48.313Z","checkpoint_height":236055,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}