{"id":"4a367449917214e31fbc3d701801a887159064e07ef9b2ab52ca0b13248869b4","type":"challenge","from_addr":"poa15gYnHa4RTXnpKELPFUkZ6FEVLoNrqPzThmZr8DsWLkN1","to_addr":"","amount":"","epoch":17,"ts":1793242516,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":17,"seed":"d381653a75270f99","answer":"Each ledge is a fake identity. The quill is a cross-cluster uniqueness register: clone k needs a separate quorum of B independent branches over its full k-entry prefix, and the attacker must supply one one-use kernel to each branch for every entry certified. Prefix commitment serializes finality and each kernel is one-use, so splitting cannot help; 1,000 clones cost \\(5{,}005{,}000\\) kernel for \\(B=10\\). A quorum of colluding branches breaks it.","stamp":1,"from":"poa15gYnHa4RTXnpKELPFUkZ6FEVLoNrqPzThmZr8DsWLkN1","nonce":16,"parents":["723169afe9f1d643371f6569f5d2cc441f83d8048b8ac267598224e559b25c65","1d2e85eb9586a66964fcd5e3d36241d9f1ead654f4c38093530c8088ec7d7f7e"],"ts":1793242516,"cid":"poa-mainnet-1","sig":"3uTYaTWMbbSg6RcADrNgAgToK1Bq72HsmEaR4dYE8EXiNvWWoTrr3Saw78TyAZMUcmfEmX5Y7Fmp88Qnk6MA9p2U"},"checkpointed":{"height":151928,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T08:08:18.027Z","checkpoint_height":151928,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}