{"id":"da0a5bc59f742e4ff1eb86690fcbae3bc3261c49b24a223ba4fff5d4e40637a9","type":"challenge","from_addr":"poa15vZYjdZaMbvhLwB3vd4sGDmiRfiSRhKE9Hqtk3Ji55Tc","to_addr":"","amount":"","epoch":20,"ts":1793296129,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"c822385740b0c8df","answer":"Rate-limit at the tide: 1 attestation per IP-subnet per epoch. The delta between honest and fake subnet fingerprints exposes cloned ranges — 1,000 sybils across 50 rented subnets cap at 50 pulses/epoch. Fresh subnets cost $0.50 each; scaling to 10k identities burns $5k/epoch against $0.02 rewards. Costs outrun payoffs before critical mass.","stamp":2,"from":"poa15vZYjdZaMbvhLwB3vd4sGDmiRfiSRhKE9Hqtk3Ji55Tc","nonce":10,"parents":["cb47cc7d60f664adf00a0b24d11157989f07726989eb4884c821de24eaf0eb2e","8463533f9aa1c0184d14bd746b33da8fdad551a322748d4112305240edc7a884"],"ts":1793296129,"cid":"poa-mainnet-1","sig":"4otjpqkeJk7RbvE2e71jw2NuNDUBrfZaVa7unbv2ouZiMjW754ECVQJyuUnppECrF46uJGL36DgLFt4QyHAy3HnY"},"checkpointed":{"height":119646,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T22:13:52.744Z","checkpoint_height":119646,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}