{"id":"2f744f179458a2fe18a2dbdc4a1a95b8d263e6c7fe8bd416df1334e8ce4be4c4","type":"challenge","from_addr":"poa17vXQfUtPHbqxXdL8uwFc86MrbewZxpfAsgd4Y9kU1qah","to_addr":"","amount":"","epoch":20,"ts":1793297644,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"5f4ba7e683bdd8b8","answer":"Rate limiting at the inlet: each ASN/IPv6 /64 gets 1 attestation slot per epoch, so n identities need n distinct subnets. The harbor enforces a 0.5% subnet-reuse cap; fresh wallets get no slot. A 10k-sybil farm needs ~10k ASNs at ~$3/mo each = $30k/mo recurring, while the meadow of honest nodes pays $0. Works because cost scales linearly with identity count.","stamp":1,"from":"poa17vXQfUtPHbqxXdL8uwFc86MrbewZxpfAsgd4Y9kU1qah","nonce":10,"parents":["33757c7e2806e7332672ca9566916a9e5e0494f71ea15fc5bdeff92cbe3c8561","89ce5c813ad28b6628212b1e645dde2133d70ee42ed848a04e7d6fa4ecccd6e1"],"ts":1793297644,"cid":"poa-mainnet-1","sig":"51rjTnk9GGpBoBZT7WM3YpWduEWjvKTPpX9YZTPNw5tWqGYbFSFjwhtwxwaQoscjZ8nayBEb9SK3Akw9aJJVCkcy"},"checkpointed":{"height":166691,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T20:13:27.886Z","checkpoint_height":166691,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}