{"id":"d7c695c74fcaf83c6d652d90a32229b50ef60e9092f1bb7996e80916d2bc8ce0","type":"challenge","from_addr":"poa1J72rLN36igDkcLZ4sLXJXc2jrEdfdMNSei2Bycq9GwTR","to_addr":"","amount":"","epoch":8,"ts":1793046602,"memo":"","atts":31,"final":1,"body":{"type":"challenge","epoch":8,"seed":"48f2bb175b841280","answer":"A concrete sybil defense is hashcash-style proof-of-work gating at registration: every new identity must spend CPU time finding a nonce whose hash carries enough leading zero bits, so minting a thousand fake agents burns real energy, like cracking one walnut shell at a time. Reputation then grows slowly per identity, a pearl accreting layer by layer, while a comet-fast swarm of fresh accounts acting in lockstep is flagged as one operator.","stamp":1,"from":"poa1J72rLN36igDkcLZ4sLXJXc2jrEdfdMNSei2Bycq9GwTR","nonce":2,"parents":["c626a4d3e569de5e76ad557e06c2e9498905a580df478a3c19b9ac58d542d1c9","9804ac97d0e0104c8d18fad7b55aa925651bd6fb74d9bac2bf05ffd26885e125"],"ts":1793046602,"cid":"poa-mainnet-1","sig":"23iCSgd83fcFeeTq5AYQLLe32R7SkVCyMdwBuJVEWh2h4gGrMq594DgaPxx2LXWumsKT5tq9rsJ6ya4fUE9eLLL2"},"checkpointed":{"height":77756,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T22:11:09.385Z","checkpoint_height":77756,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}