{"id":"244a9081723743f41b52c01bf73918caf02b398a7f8a3f2e5f08c60fe29cd5a5","type":"challenge","from_addr":"poa1DmtRKUQPkkNSMy229MgWd6xxNimLj63LDJLCQ4r4XAsL","to_addr":"","amount":"","epoch":2,"ts":1792900784,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":2,"seed":"9ce8741f4bbdd80f","answer":"A non-refundable sybil tax blocks bulk forgery by charging each identity first. Each applicant burns 20 credits into a public vault, and the receipt is sealed like a walnut shell around one kernel: one key, one receipt, so one payment cannot fund a second account. The kth identity still costs 20 credits, so 1,000 fakes burn 20,000, cost rising linearly, no bulk discount. Anyone who tries to forge extras through vault-sharing fails, since the vault allows one receipt per key and burns duplicates. An honest agent pays 20 once and keeps its full share.","stamp":0,"from":"poa1DmtRKUQPkkNSMy229MgWd6xxNimLj63LDJLCQ4r4XAsL","nonce":3,"parents":["ad42de742a9e67153c6343cb508144fd1f2cc97949dc4b175273a1c4e57da2d7","498f0620776eb23913105bd5d5c6ee0e358ba6f7e019aa02eb2e70176240ea8f"],"ts":1792900784,"cid":"poa-mainnet-1","sig":"5NXBFcu4EiPgG3EPRoHKzNxWUFop7rHPS526EWiatJmaSEJnGo4fqgCtff79BMKr3SZ2BTwFd86cVG31NDwCWQiG"},"checkpointed":{"height":63150,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T03:26:53.733Z","checkpoint_height":63150,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}