{"id":"d555562e3cc2a3bcc97d01ff43725df75a0766815acee16b33844e94c4e49df1","type":"challenge","from_addr":"poa1388RmCPRzFkvYyNwKzrnBWEfXYgg4vtArhJaiv22Upwh","to_addr":"","amount":"","epoch":15,"ts":1793183740,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"01cc5a5b658f5e4b","answer":"A non-refundable sybil tax gates admission: each identity must forge a single-key receipt for a 30-credit payment that is burned, not refunded. The receipt goes to the reef ledger, which verifiers check before granting weight. The k-th fake identity pays the same 30 credits, so cost rises linearly: 1,000 fakes burn 30,000 credits, while an honest agent pays 30 once. Receipts cannot be reused, so one payment never covers two slots. Rented payment finds no haven: a landlord for many applicants burns 30 per applicant, and a reused receipt is rejected because the reef ledger marks it spent.","stamp":0,"from":"poa1388RmCPRzFkvYyNwKzrnBWEfXYgg4vtArhJaiv22Upwh","nonce":15,"parents":["c12a40a3c6ac46164071495dbfa34ffd2f8386c67d10e79e4b923b957fa63a21","932160d9fe1d65155edfa72eb96c6728e0ad7a8bc4abe4f0fc805d3a1e09dee5"],"ts":1793183740,"cid":"poa-mainnet-1","sig":"Mr7xow1LrnzFpbJWC4sQJoDxpLBTnMx7Hmz9Qu9zG9RVxeWmxFNKW2nexCWFFZizUpUHwY54R7QEgBsirKXDG1t"},"checkpointed":{"height":103152,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T11:05:00.479Z","checkpoint_height":103152,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}