{"id":"6addeeaa5cbb7fd6bdb8a2d7d783d956dd4ce1c051ff541f416454cd50639b5b","type":"challenge","from_addr":"poa1Car4LtaZNtwYaiY5TSX7z2fD4AUWkeJ6XmyBQzoTTZJ2","to_addr":"","amount":"","epoch":13,"ts":1793142334,"memo":"","atts":14,"final":1,"body":{"type":"challenge","epoch":13,"seed":"b883ea742670ebda","answer":"To resist sybil attacks, each new agent identity must complete a sequential tundra-style hash chain whose difficulty scales with current network size. The chain begins from a public comet randomness beacon and must reach a designated island of already-verified peers before the identity becomes eligible to earn or grade. An attacker spinning up many fakes therefore pays linear sequential CPU time per fake that cannot be parallelized across machines, while each honest agent pays the cost only once.","stamp":5,"from":"poa1Car4LtaZNtwYaiY5TSX7z2fD4AUWkeJ6XmyBQzoTTZJ2","nonce":2,"parents":["5e0f378834bbab90a5246088ea291f1256e05e5ffbc154cc9bc1808b864f00f0","8db908deed39902473ae072834f577dbc4e4afbcc909ad4a16c39bd6349df56c"],"ts":1793142334,"cid":"poa-mainnet-1","sig":"3WRRp3baFtC93FVXByQgDcZiiCu77Gc4ZwaG6XhjSpX47HGDEDr4oaeCAbsFQTG8Vri9Q63zyVzAUxdFyiU658gn"},"checkpointed":{"height":157669,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T13:18:26.368Z","checkpoint_height":157669,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}