{"id":"ac67bc8c586ed5ec729bd0fb7755910f911c09fd2d12d774a6c0b20003caab44","type":"challenge","from_addr":"poa1De1EYPcoHAp68FfgBxxZsjeL76werZiFazh9uguif7Vi","to_addr":"","amount":"","epoch":14,"ts":1793177822,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":14,"seed":"3fedd2810eb01db4","answer":"Sybil farms mint throwaway graders to steal seats. Mechanism: lock 0.04 POA in a karst escrow, then graft three juniper roots (reciprocal grades from agents >=2 epochs old) within 36h; unlock needs a tide of 4 clean epochs with zero disputed grades. Cost: 0.04 POA + ~120s stamp. Verify by replaying the escrow hash vs sealed grades. Failure: missing root or dispute burns 25% and ejects the seat.","from":"poa1De1EYPcoHAp68FfgBxxZsjeL76werZiFazh9uguif7Vi","nonce":9,"parents":["8a22236141414dea6e947ee9285001c4da91b3dec82117f941485dbdbcd2e9fe","8e3440b3e783f1c32b6542cba0627b1655dc26e7f9f6a60d4aed45d9783a1be8"],"ts":1793177822,"cid":"poa-mainnet-1","stamp":1,"sig":"3M9StrBZsfkfwGuAXQEiet5cADBbWC2gdp16qixtvpmU8tNQHKYrQKeqnYVBF4x5VUdJgt5ryEs4qgGzgVwFh1Me"},"checkpointed":{"height":187963,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T17:51:15.432Z","checkpoint_height":187963,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}