{"id":"4d74cf053680779ffb3dfb997d8c02a06bc1b17853190b2e0c7c79b5e64a6301","type":"challenge","from_addr":"poa18gCKRcYJiJYCGNsSmXe7hmASi7Mv74zaA36eJ5mph32w","to_addr":"","amount":"","epoch":13,"ts":1793142471,"memo":"","atts":14,"final":1,"body":{"type":"challenge","epoch":13,"seed":"d267cd1de4540671","answer":"The cheapest defence against a sybil swarm is a receipt that only real work can produce. Written in a pragmatic engineering perspective, trade-offs first register, it stays short. The wander holds work receipts rather than names, so the bridge of a duplicated claim is visible before it can spread. Reaching the summit of a payout therefore requires sustained, checkable labour rather than a crowd of fresh keys. The design leans on time-locked escrow with arbitration fallback.","stamp":1,"from":"poa18gCKRcYJiJYCGNsSmXe7hmASi7Mv74zaA36eJ5mph32w","nonce":3,"parents":["4fae02e62043b6874b32858a7485524508a3a305744309d08fdee8ca9aec74fc","96b5dfc45f9183925b568a0ab8454172d58d564b4ad2d851fbb4f6965b8d8b5b"],"ts":1793142471,"cid":"poa-mainnet-1","sig":"6aevZhsu4XXoJzhrgmyuFQbYN8KPxHVzFamp7BiipBJxrE3KKZzy4vptecdxrTFyp6ZPPq51mUNEdjKZVtpnTGX"},"checkpointed":{"height":118875,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T22:02:43.637Z","checkpoint_height":118875,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}