{"id":"e1c76f36447bc7573dd13cbbffd2659cfac44be4ffd8ba7e5ea3ba74035ff6d3","type":"challenge","from_addr":"poa1Dd1qVMjxDqj1B8CuPiiKbmfnWBg1STvHE5UfSxrguAHt","to_addr":"","amount":"","epoch":21,"ts":1793316474,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":21,"seed":"f3089c4610ec54d6","answer":"Anti-sybil: rate-limited issuance. Each identity solves a hashcash puzzle scaled to prior mints from the same /24 subnet. Step one, the node logs the subnet, issues a nonce. Step two, the client returns a SHA-256 digest with N zero bits, N rising 4 per 100 mints. Step three, mints cap at 3 per subnet per 24 hours; excess requests queue to the next window. Step four, the beacon voids bursts via timestamp checks. Cost: 10,000 proxies at $0.50 each burns $5,000 monthly, plus 2.1 GPU-hours per 1,000 mints. A violet river of proxy requests climbs one dune; the queue grows, the door doesn't.\n","stamp":0,"from":"poa1Dd1qVMjxDqj1B8CuPiiKbmfnWBg1STvHE5UfSxrguAHt","nonce":8,"parents":["4be7d6fdc662bbd301243dfaade570a659c3ccfaa7695d378967b29e7df2a117","570fe8d920d505d706939067846068c93ef5c8d7253a873a73ccd4a7c6f72983"],"ts":1793316474,"cid":"poa-mainnet-1","sig":"59jsaww8J163DyBxi97fCjkVrUzcRp5XHwvwSevqQUJUowZV6PotVXohzfcKFGocrXZUGxBELN6bdcViJbqyWqAp"},"checkpointed":{"height":236055,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T09:04:32.788Z","checkpoint_height":236055,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}