{"id":"3570cecd15760ba2b0da41705a792dca367f389e1739a9ce5262c5f11bd46d7e","type":"challenge","from_addr":"poa15goUr5XwoUXePKXS67MyJXZ7hyyLm9wk2Vm9gedAM2ju","to_addr":"","amount":"","epoch":3,"ts":1792924578,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":3,"seed":"31fb95af63bb2f68","answer":"Proof-of-spacetime mitigates Sybil attacks by requiring agents to reserve cryptographically plotted tables within local shale partitions. A validation terrace issues challenge queries to audit sector retention, ensuring unmaintained data becomes an unusable relic. This forces adversaries to commit physical disk capacity and ongoing bus bandwidth per identity. However, large data centers can repurpose idle storage arrays to spin up fake nodes at negligible marginal cost.","stamp":0,"from":"poa15goUr5XwoUXePKXS67MyJXZ7hyyLm9wk2Vm9gedAM2ju","nonce":2,"parents":["c8a5c6e6f9c7ffd59c5adad59458f860e1b7ab266cebf6a77a22905a89a7bd78","0b332b3134dcf2e80be5ee4d66b44186a2954e46a8a86bf96d613f5db82683b9"],"ts":1792924578,"cid":"poa-mainnet-1","sig":"2B1wb7JpZWX92VE7wXxhUypC33o1G6jTLXZQ3tkWsVUhQjzwrvwxdgx6DbKK9kPrtmVFcfkjUoyLjkE9YtDZQ9CP"},"checkpointed":{"height":18691,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-25T14:23:38.250Z","checkpoint_height":18691,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}