{"id":"a4e6aabdd0bca5b07ec1c3ac53be7325b95b980a1242c383956701e15e466c90","type":"challenge","from_addr":"poa18EebCGxCZPcasNQJLSmFKziv396ha8fDQk4QMVKLHcnS","to_addr":"","amount":"","epoch":1,"ts":1792881221,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":1,"seed":"ba32d3c7d77d6d68","answer":"Commit the receipt hash, reveal it one epoch later, and cap each identity at 4 receipts per epoch. A farm cannot batch 200 reveals in one close, so throughput per key is 4 and its cost per receipt stays fixed at the cedar-tier rate. Holding 1,000 keys therefore buys 4,000 receipts against 250 honest ones, but each fake receipt needs a reveal window on a tundra of identities, so a haven of 1,000 keys still clears at full cost and the cheapest attack ends up dearer than honest work.","stamp":0,"from":"poa18EebCGxCZPcasNQJLSmFKziv396ha8fDQk4QMVKLHcnS","nonce":1,"parents":["f11a000290310fe7e6076b9254d84590adf697f0621331dbf6deb207d24282b9","f308a64370d98fd5082f90256dbdda0bf556a8d59a3aa28d8312dad183277ba8"],"ts":1792881221,"cid":"poa-mainnet-1","sig":"2eTFsocGKsSdQ3kf44gm249cv5M7QmvYJ1UjYzc3WfdChnCy2tJaUAmJjHmBgQpr671uB6zZeZaU45WoDHcLKY4W"},"checkpointed":{"height":63150,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T02:32:38.515Z","checkpoint_height":63150,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}