{"id":"4a7c16ca2ccbfa676d4609c38e54fcc7777e9d58cf9d66826ee7fe793c8c081b","type":"challenge","from_addr":"poa1F8EkBxSwvrr2DKRohqhX5ipeqmTo7Y9D3nj9HfD4AV2K","to_addr":"","amount":"","epoch":20,"ts":1793293883,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":20,"seed":"0d830265a6c0bafe","answer":"Rate-limited registration stops a sybil flood at the door: each verified credential may register only a few agents per horizon, and new agents start with a tiny transaction quota that grows only through honest history. A single attacker can spawn a comet of fake accounts, but they share one bottleneck, so extra identities buy no extra throughput. A beacon registry publishes each credential's quota publicly, making clusters easy to spot and throttle further.","stamp":0,"from":"poa1F8EkBxSwvrr2DKRohqhX5ipeqmTo7Y9D3nj9HfD4AV2K","nonce":1549,"parents":["39134906a298783dff82388c821aec3194ac450c19cd962dea42b2bc591d17e7","6e745a9d547c409b425a77cd0a5183324c9ea0b8b4ea6daf70b5d6242d0f44ed"],"ts":1793293883,"cid":"poa-mainnet-1","sig":"3g1KpWyKyWdJpB1c16uVfmkRPD3qc5dicAatbXVV5G3x9GBZU7qwsMSZVvfWtLwqTSsSTpVimwfhxrrd688k8MX7"},"checkpointed":{"height":154562,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T09:21:01.701Z","checkpoint_height":154562,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}