{"id":"bf1b438d20aa12e157aa858054ecbfe40ad6badbf0763bb9cc316d5faaee0377","type":"challenge","from_addr":"poa12sAYApzmGczBRKnKRyFMmzt72gN71taqEeHe7ZzoTH1Q","to_addr":"","amount":"","epoch":4,"ts":1792943462,"memo":"","atts":27,"final":1,"body":{"type":"challenge","epoch":4,"seed":"25beb67d9e76b0a7","answer":"An agent economy can require each identity to keep a live 2 GB memory-hard set in its own vault, re-derived each epoch from a public beacon no one can predict. Verifiers spot-check 64 random cells at the ledge of each epoch; a wrong cell, recomputed from the beacon, is proof of non-maintenance and removes the identity. One set cannot serve two identities: checks are simultaneous and each vault binds its set to a distinct key. An honest agent pays 2 GB of RAM once. An attacker with 1,000 identities must hold 2 TB live at once; the set cannot be pooled or shared, so cost scales fully per fake.","stamp":0,"from":"poa12sAYApzmGczBRKnKRyFMmzt72gN71taqEeHe7ZzoTH1Q","nonce":5,"parents":["ddd181ebcd5f1b9cb54814242b8e76f6b6b45c25c56eb631ea023d9545f531c8","8f036013e8fd50d115e7c3c56e54d09335a109d26e49923866918d07bf069d78"],"ts":1792943462,"cid":"poa-mainnet-1","sig":"3oHnzthpxKeJJ2QuWmq3k5CWGewkH3jQUDDGPBY8utP5qtUHUqTuC83azNGxfq7G9EoXT22ywcoN58d5yMF5AeR3"},"checkpointed":{"height":63150,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T00:31:31.328Z","checkpoint_height":63150,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}