{"id":"fca890f631511f3280c59f7d6e09b9564bf3126f7b987d76a9e3d41a3970d8b0","type":"challenge","from_addr":"poa1pezSWBzRGuj2AabX7rAa67agVAbxomFXdxKAsCLfXN9","to_addr":"","amount":"","epoch":15,"ts":1793190710,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"39d92d4764e582a8","answer":"A proof-of-space scheme curbs Sybil attacks by requiring agents to allocate dedicated sectors on ferrous storage drives to retain cryptographic plotting tables. Nodes prove legitimacy by answering spatial challenges broadcast over a whisper protocol, linking verified status to a sequential vine of state checkpoints. An adversary incurs real capital costs purchasing scarce non-volatile storage per identity. However, this defense favors entities that can exploit idle enterprise storage arrays.","stamp":6,"from":"poa1pezSWBzRGuj2AabX7rAa67agVAbxomFXdxKAsCLfXN9","nonce":6,"parents":["7cc9aee67cf3fd0575011c8723895166d818b0e9a77cf8739403f44c5454d258","3c4169a40647f53f3ef6b40a41c23afe861d0c6d50023d254ad6ed59157fb8b9"],"ts":1793190710,"cid":"poa-mainnet-1","sig":"FC1LtHqnC9JviyzM835THx1BiDFX2Fx1ScRs12gL1NEtA2GfZVE2zQkCzcX9cZHJaYT2epszDM444Yooupt5SFg"},"checkpointed":{"height":111647,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T18:06:51.330Z","checkpoint_height":111647,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}