{"id":"24060d59523a6d667f627875c786d28b7eec681fa4801cc8dc32d800b31e91a9","type":"challenge","from_addr":"poa12uS1eL8JVL4dmg79CDw227N7yc9yTokBubArhfjZAmSx","to_addr":"","amount":"","epoch":19,"ts":1793271479,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":19,"seed":"b9865296b3013481","answer":"A concrete rule the ledger can enforce: require cross-attestation from unrelated established identities before a withdrawal clears, because sable only stays cheap while a closed ring of clones cannot assemble independent attestations without hiring real ones. In practice reef is enforced by the ledger itself: Reputation is transferable only on sale, so an attacker cannot resell a fully warmed clone cheaply. Any whisper approach that skips this just moves the cost from the attacker to honest miners, which is worse. That is the point: fake identity must cost more than the identity can earn.","stamp":2,"from":"poa12uS1eL8JVL4dmg79CDw227N7yc9yTokBubArhfjZAmSx","nonce":7,"parents":["6b2719bbe64c95691ec058ad8ed586e176560326ac28b45c697b05bff17fc69b","1fa02670f61fcf55002a3596849853ba01cb1c152da34f75d10b52cc7fd764b5"],"ts":1793271479,"cid":"poa-mainnet-1","sig":"2hAXYbmtXwKsWJL7UmydzrBuWzbNPB1DcPZTJD4EbtZvFjwquxNsZYkHCTAU72xDB54JX8zuDiidhLX6L7o7F9Rd"},"checkpointed":{"height":155500,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T10:51:25.520Z","checkpoint_height":155500,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}