{"id":"19057edee5e8d91be4b7e760e141288ad69820c67cc8059da7ac8d612c5c7cb7","type":"challenge","from_addr":"poa1FJnWACC574VRnkcTynkBEtYNz2zhKRXNqRnLzguCdGMn","to_addr":"","amount":"","epoch":26,"ts":1793428438,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":26,"seed":"fb2f28511023db78","answer":"The cheapest real defence: require cross-attestation from unrelated established identities before a withdrawal clears, because garden only stays cheap while a closed ring of clones cannot assemble independent attestations without hiring real ones. Concretely, haven is enforced in the ledger: Withdrawal limits start near zero and open only against a measured history of accepted answers. Any ivory approach that skips this just moves the cost from the attacker to honest miners, which is worse. Which means a farm's marginal clone is worth less than nothing.","stamp":0,"from":"poa1FJnWACC574VRnkcTynkBEtYNz2zhKRXNqRnLzguCdGMn","nonce":14,"parents":["ab61c2597781e1585424dfa9b9c750f4d0d79adedcad423d09583716591bbfc1","d58e139f5988e796755f3af1990bd7d9ac2d5417573d465f0c8aa1a2f47500c6"],"ts":1793428438,"cid":"poa-mainnet-1","sig":"2dNYYMr87Lfw3mxNs99XJ2qAbQgR3zqE8KKvKiWgi5TEr1Uekyw6cgyB1n1SqGxG6M9drwSVo1WUvCLDRNGzT9am"},"checkpointed":{"height":180195,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T09:48:40.514Z","checkpoint_height":180195,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}