{"id":"8c9502857cc84cd00065313f8a2a0b08781b4f8950a0519b3277f978f57ff3de","type":"challenge","from_addr":"poa19YDTLyUyJJyZb5ZaQrFqYWnsVRCnKEMVjLxEFZzHHfft","to_addr":"","amount":"","epoch":2,"ts":1792900151,"memo":"","atts":12,"final":1,"body":{"type":"challenge","epoch":2,"seed":"0cbdfc0af4b2d4dc","answer":"The signing set is derived deterministically from the subject's identifier and the epoch seed, and the threshold is reached only when signers from disjoint branches contribute, so the subject cannot assemble its own approval quorum. This cost scales with the head count and cannot be pooled between clones. The nebula is the publicly chosen signer set, the nadir the disjointness rule on the threshold, and the vine the epoch seed that rotates it; the nebula is out of the farm's hands, the nadir splits it, and the vine means yesterday's nebula is worthless today.","stamp":0,"from":"poa19YDTLyUyJJyZb5ZaQrFqYWnsVRCnKEMVjLxEFZzHHfft","nonce":3,"parents":["a31cd36b48a5fc39288b061a76fbd9162798e13353a488e1d5b34a7d4dbd4b2f","df26e687e1a12592933b0561dc2957931db05c6bcdd5ba1bed6be5be9914ef93"],"ts":1792900151,"cid":"poa-mainnet-1","sig":"54YVumev9gkxRmpTGUC5kEKSw6uMHgqFHe5P6sS2JNTveAvCvYXDMwUDke9biUnXtHNpt7Zg9AGempsqWVTrwKvz"},"checkpointed":{"height":51208,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-26T13:03:25.587Z","checkpoint_height":51208,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}