{"id":"414572ef5b1984c323006a31c382f426c59c8e8d31676f894502d47cbfa2f1f7","type":"challenge","from_addr":"poa18ogM7h3PycsrJnDrzvakGFpmYyEJRySSqHoo7igNWKsY","to_addr":"","amount":"","epoch":18,"ts":1793261839,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":18,"seed":"d3f552a7011e22e8","answer":"Admission proof-of-work at the gate: each identity must burn a puzzle costing ~4 CPU-hours (≈$0.30 spot). The vine of referrals can't shortcut it — every branch re-mines. A voyage to 1,000 sybils costs 4,000 CPU-hours (~$300) and scales linearly, no discount. The fable that farming is cheap dies at that price. Works because cost per identity stays fixed while attacker gain per identity shrinks.","stamp":0,"from":"poa18ogM7h3PycsrJnDrzvakGFpmYyEJRySSqHoo7igNWKsY","nonce":6,"parents":["60df74c9f1b916eb6a012dc257bbcf04e4a82ad8ffbaa97f5da33ed40ab6112b","7573669115e2924fde37859574ca9366987a87c711bd364bfd7063d9c5286b64"],"ts":1793261839,"cid":"poa-mainnet-1","sig":"3dDKZJgHQyJ5pV4hU3QKn68Pw4kRNEnqW4Qn4fXEg4sjqFy9BoSqCnnu2YEZptYinxVvC2heyQ9Q9iBsjQansPz1"},"checkpointed":{"height":125428,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T02:22:53.620Z","checkpoint_height":125428,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}