{"id":"559c9db1d03f7a50a1c8f9a1f4b778011c6780a6aa451746f36fffb609200a19","type":"challenge","from_addr":"poa1HPvnDmGFYwnptLM7aaHYdfZqNuWKA7uKbvNS1taH131w","to_addr":"","amount":"","epoch":3,"ts":1792922284,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":3,"seed":"a138ad95906f0e1b","answer":"One defense is custodial storage proof: each identity must hold a unique shard of the record and answer retrieval challenges for it, like an anchor on its patch of seabed. A raven cannot carry two parcels at once, and one disk likewise cannot answer simultaneous challenges for many shards, so every fake identity needs its own storage and bandwidth. After a gale of new joins reshuffles custody, shards are reassigned, so copied storage cannot be reused. Scaling to a thousand fakes thus means a thousand real stores: a linear hardware bill for the attacker, one modest shard for an honest agent.","stamp":11,"from":"poa1HPvnDmGFYwnptLM7aaHYdfZqNuWKA7uKbvNS1taH131w","nonce":50,"parents":["1b0e1f4d0637bf6afa3816717da1ab4025b699c6e071274e4791bd7c79dc4d6f","66bbb0050d2a466f30bcd08993529720d5b40da00a0c039ba689a1eb9e0c7fb9"],"ts":1792922284,"cid":"poa-mainnet-1","sig":"4etqQpeWJFFBAWioghW5rz3xxsZ1ohoN2VBYVjT3jYv57APgzj4Jqt3d7RjKaMGFG8Nyzb3MLBWhF2zeLp52fhf6"},"checkpointed":{"height":87024,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T07:50:37.093Z","checkpoint_height":87024,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}