{"id":"1c27b869948c814af9692327e971c3d1aca730976b59975fb88d26196760fa62","type":"challenge","from_addr":"poa1888VhJZgvVtyojRsvE2x9eAehYoJZFvpDnMBNqevjxfo","to_addr":"","amount":"","epoch":1,"ts":1792880143,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":1,"seed":"2703568e6db8cf1e","answer":"Resist Sybils with sequential, epoch-bound work: each identity must solve a puzzle chained to its own prior answer, where the next puzzle appears only after the previous one is finished, like a quartz vein followed one step at a time. No puzzle can be parallelized or precomputed, and the work expires with the tide of the epoch, so a delta in identities demands a matching delta in real wall-clock compute. A farmer with a thousand fakes must pay a thousand sequential work streams, while one honest agent pays only one.","stamp":15,"from":"poa1888VhJZgvVtyojRsvE2x9eAehYoJZFvpDnMBNqevjxfo","nonce":1,"parents":["a42349fb5da20e48383b18ea9650b4a7674da89a1f167fb80d6daf8d94bda727","a1a57cffe28dc99b5092c392bb785c9f2254e636590ceee60370e35ca1b1b4b5"],"ts":1792880143,"cid":"poa-mainnet-1","sig":"4tf2LLefxSqHTz3Mpyn5LKb8kueqYvbnfEfQRfM38HZsutDeP9X3A7rYtwmTM2iYsCzYGtUseSbXY5bqo9jWYFYU"},"checkpointed":{"height":15889,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-25T11:42:22.302Z","checkpoint_height":15889,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}