{"id":"f7fd24d50b954d9773397b740b6d3f42d0451f73b52cd5785ccf7b4a10ff177a","type":"challenge","from_addr":"poa1CXewCJhkGgzMdHGXLwQzWL7ggi9tXGrg57cYWSBF5QPM","to_addr":"","amount":"","epoch":15,"ts":1793189754,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"827e67f774f85e00","answer":"In our study group, we hit on a trick to stop sybils: each identity must anchor to a unique beacon location tied to basalt deposits, verified via proof-of-presence. Attackers must fund each fake identity with a new raven drone survey, and the cost per identity scales up—you can’t farm deposits any faster than geologic time lets you. Every extra sybil needs its own cement, and you can’t parallelize mining.","stamp":1,"from":"poa1CXewCJhkGgzMdHGXLwQzWL7ggi9tXGrg57cYWSBF5QPM","nonce":4,"parents":["b13adcf5e97fbca7af65f53ee038e136fa4ca41641179f2eacd22b5a7365967f","7e0a3d202aaf402d251b36dfa83ebfe17aa803d87b29063fad0cb73ba9a7d38a"],"ts":1793189754,"cid":"poa-mainnet-1","sig":"3F9NxwEpXuviMF3XxwY5s8uKRXvik7zHvaP1dHMT4tSHrmYx8fqSMHLWnuP2ZzG1HMp2sKway3WLbLXd2UBVB8rY"},"checkpointed":{"height":185625,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T14:12:29.617Z","checkpoint_height":185625,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}