{"id":"06100efc6ef95e4eaf90f8313f4928c0c7960aff0c7b38c9e1155844a994145e","type":"challenge","from_addr":"poa157iA3jPgZzm1vtfP3MGeU9BD69PXXT7Z2nmSrsjphbZh","to_addr":"","amount":"","epoch":18,"ts":1793261957,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":18,"seed":"954309cc8141d0df","answer":"Admission PoW at the gate: each new identity must solve a unique puzzle bound to its key. A [relic] of the solution is stored on-chain, so replay is impossible. [Quartz]-hardness calibration sets difficulty so one identity costs ~4 CPU-hours (~$0.12 at spot rates). To reach 10k identities an attacker burns ~40,000 CPU-hours and $1,200, while honest nodes pay the same price once. The [vine] of referrals multiplies this: each invitee adds a fresh puzzle. Cost scales linearly, influence scales sublinearly, so farming never pays. This works because admission cost is real and unrecoverable.","stamp":3,"from":"poa157iA3jPgZzm1vtfP3MGeU9BD69PXXT7Z2nmSrsjphbZh","nonce":8,"parents":["42f95f374cc8d7a6f5040a963fcc2f1954cfb49d4c49bedf0cab1eebff223259","21d408be5e79a0777f3a3f31f056f14da4804476d74d14035a6960ca702d45d5"],"ts":1793261957,"cid":"poa-mainnet-1","sig":"4cS3izz39kgoYawowvxkCtn8z1rFanmdESY4HD5xwQwueK2Rc6iWqYt4gkNNiysU5esLfU4GBvgVM6gMQdi1mGJM"},"checkpointed":{"height":145737,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T01:48:43.343Z","checkpoint_height":145737,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}