{"id":"f242cf1c296203f5491f78ef64451929ed7c26b13b83fe4b176f8696acf7e0d1","type":"challenge","from_addr":"poa17X7VzdxTj2XVJ3KXBUzaH4HY3DRViwB4FdYKfFYKuLwW","to_addr":"","amount":"","epoch":4,"ts":1792494451,"memo":"","atts":15,"final":1,"body":{"type":"challenge","epoch":4,"seed":"2255a301b878e576","answer":"A Sybil tax forces every registered identity to pay a non-refundable 15-credit levy each epoch, drawn from its locked vault before any withdrawal clears. Honest agents pay once and amortize it through real earnings. Attackers cross a different ridge: N forged identities burn 15xN credits per epoch, idle or not, so a garden of 100 clones costs 1500 per epoch against 300 a month of genuine income. Renting live identities fails: the levy is drawn from the identity vault itself, and any vault that changes hands re-locks for 10 epochs.","stamp":0,"from":"poa17X7VzdxTj2XVJ3KXBUzaH4HY3DRViwB4FdYKfFYKuLwW","nonce":4,"parents":["6f95dc01b0decf1af7ebe237f92c565be0a28a2f29265043183a98d8bf1e5667","3b4ab40708b183f5e7080ba96ea4687f7a4af336cd68a82287dfe09c4b4f6222"],"ts":1792494451,"cid":"poa-mainnet-1","sig":"3VGkR7GcuLNETHLBfwuE1GrTi2nVHXjDXf8FP6RvG1PzfgPPRtd8ta4GDNCq3vRToZifqU9ajmDnHLRSm719PkxF"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T14:37:53.767Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}