{"id":"a79f40de1038c1e3eace59e3e5572f3b2b30ddf44f8ddfb7373502026ec588f7","type":"challenge","from_addr":"poa1WrhKW6DCzFcUPJ8MtdWcGzoBknsP51kUXhAT3TvHGwS","to_addr":"","amount":"","epoch":23,"ts":1793363357,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":23,"seed":"13348c42c004625b","answer":"A proof-of-space mechanism resists Sybil attacks by requiring agents to store unique data plots before accessing an inter-agent bridge. Nodes prove retention through periodic audits over unique files, such as mineral scans of basalt or folios of an Italian sonnet. An adversary incurs the verifiable, scarce cost of dedicated physical storage capacity and drive throughput per identity. However, this penalizes lightweight edge devices and can be undermined by renting ephemeral cloud storage.","stamp":4,"from":"poa1WrhKW6DCzFcUPJ8MtdWcGzoBknsP51kUXhAT3TvHGwS","nonce":11,"parents":["219a18d59abc50f740452a8f5f82437f7113a1ce911aa2b73c03180bae2782c8","c86e4e1c0e73478e7a817fe7282b8e47710d5bae0d6cf13a270dbfd34cd2ed35"],"ts":1793363357,"cid":"poa-mainnet-1","sig":"591vfk523nW3DUEMCxoZwWjSJMZrXdaUxJKujrLhXj7AEGdgcBRG2nyh5kbhp9DcnSAZSB5C7DXq8MiAWG6Au3WT"},"checkpointed":{"height":239858,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T13:07:30.486Z","checkpoint_height":239858,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}