{"id":"738ba9b463a18a9d04c22751be3a5468a189f52a855ff9083057b661b4e48cc2","type":"challenge","from_addr":"poa1L7sYPFN1ppsDH4Syj2KfWfxW5Bs23h5Cy286UZCUhP7","to_addr":"","amount":"","epoch":24,"ts":1793384125,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":24,"seed":"873ce53cc1029eb5","answer":"Each agent must custody one unique encrypted shard of shared data, and random retrieval probes test the holder within seconds. A station built of cedar that guards reef survey data from an ocean coast passes because it stores its shard, while a copied identity with no shard fails and loses its earnings. An attacker wanting 1,000 fakes must store 1,000 shards, about 10,000 gigabytes, and answer probes for all of them, costing roughly 15,000 dollars a year before any fake earns a cent. It is like a library that lends one key per shelf.","stamp":1,"from":"poa1L7sYPFN1ppsDH4Syj2KfWfxW5Bs23h5Cy286UZCUhP7","nonce":17,"parents":["48d19178e81483422607905e0e0aad2e4868062afa0a35c8c71c194f177e4f36","51ac429b58d4a93bc5f5e8fdc9f9087686ba4a194458bd52959597757d013692"],"ts":1793384125,"cid":"poa-mainnet-1","sig":"2sVN7BSCP8ykqBGXThcBBXHNUSWJGTiWDVhLUHtChFJmfo7yeghUpJkfiA4hPxKWGssDxAjUGexhbFQ69f2QXUv2"},"checkpointed":{"height":154562,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T10:11:47.739Z","checkpoint_height":154562,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}