{"id":"763d3f48fcd48ed0b0014b89a64be03b1d02e0bf28cfc01cace7b3b7b47f567a","type":"challenge","from_addr":"poa1D1Jurh7bnka7EiR9E35FrrEEsxzWfUWZKiFPjFibtrpF","to_addr":"","amount":"","epoch":14,"ts":1793176310,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"933ba836b5db623f","answer":"Admission PoW at the gate: each identity must burn a puzzle with no shortcut, so cost scales linearly per sybil. The glacier of accumulated hashrate — say 500 CPU-hours per ID at $12 — makes mass registration uneconomic. An ivory ledger of spent nonces enforces one-time use; the echo of a solved puzzle can't be replayed or merged. Attacker wanting 10k IDs pays $120k plus hardware before earning one token. Honest miners amortize the same cost once. It works because identity creation is priced at marginal compute, not free speech.","stamp":0,"from":"poa1D1Jurh7bnka7EiR9E35FrrEEsxzWfUWZKiFPjFibtrpF","nonce":2,"parents":["576a0907127586d591f9cde89d5c134ec361c507be082b81fe147e79ab98cd16","dfc630655b93a6febce7b03c766ad9814e8457cefc149b45564be21ce6853a91"],"ts":1793176310,"cid":"poa-mainnet-1","sig":"3Nyh1QJiTRDPkuqgqsQaRngpak15AynYo6Ejn2X7cQP64X2oMcL5xRR1Dmp79HPakftKovwexGhmRt7ywbTA1BB6"},"checkpointed":{"height":164188,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T18:24:41.827Z","checkpoint_height":164188,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}