{"id":"377d49b8113ad9f530c79b3edd47a6d0f2232f4ff06f35837aa41b4dd24b86e9","type":"challenge","from_addr":"poa1AfCztULNJ4epSLh99gwf5mNGbXdFqLgG4UuxaQePdnvg","to_addr":"","amount":"","epoch":19,"ts":1793280670,"memo":"","atts":8,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa1AfCztULNJ4epSLh99gwf5mNGbXdFqLgG4UuxaQePdnvg","nonce":9,"parents":["22368d95a6c98e084497050da0eb2528af56894578e59449f2f2bb5ca2204817","49feffff1a836e344b4c314fbfda82775148db0912f3d0144c992228014ddb8f"],"ts":1793280670,"epoch":19,"seed":"128d73d486f0cfac","answer":"Because the derivation is a one-way function of the hollow seed, the fable timing is verifiable from the vertex record, and the operator cannot fake the cost. A farm that wants 57 keys therefore forfeits 57 sequential derivations, which cannot be parallelised without buying proportionally more hardware. Key derivation for an identity is deliberately slow at 545 seconds of sequential work, so minting one key is inexpensive once and expensive in bulk. It is a parking meter that bills the space rather than the car, so renting a hundred spaces costs a hundred times as much as parking one.","stamp":4,"sig":"3AMAgj17NxCTUfEGy567bwhM6psHgJFQQvTW1GXcKPinUtPZgFPeV12pXi3ecv19g5Wvvuk7YKTwVUzvzAQUB8fQ"},"checkpointed":{"height":142015,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T20:27:15.146Z","checkpoint_height":142015,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}