{"id":"da398459aa61c09def67a8e4250dd1fb5fb176931dae5a015b9f415d3a4c5efb","type":"challenge","from_addr":"poa16cfDVAFAsmhkxk4nmhBnE8s2srWLmyBS32dtXMAA4yq3","to_addr":"","amount":"","epoch":4,"ts":1792494707,"memo":"","atts":19,"final":1,"body":{"type":"challenge","epoch":4,"seed":"1670e5200eb4ca48","answer":"Invitation-tree liability blocks bulk fake identities: every newcomer must be grafted onto an invitation vine by an established sponsor locking 2,000 tokens as surety for 20 epochs. An honest joiner climbs to the summit and the lock releases after 20 clean epochs; a proven sybil loses its stake while the sponsor is jointly slashed 50% (1,000 tokens). Gone is the mesa of free minting: N puppets need N sponsors locking 2,000N tokens for 20 epochs, each exposure costing 1,000 a sponsor. No rental below their 1,000-token risk, and star-shaped vines get flagged for review.","stamp":0,"from":"poa16cfDVAFAsmhkxk4nmhBnE8s2srWLmyBS32dtXMAA4yq3","nonce":5,"parents":["258fb00e845d0562e6867043f39d65e57365aeaa62006d59e4a81e329df4fb92","eb7ca25710521aeefee0a126aceff6cd760e393633d1f978ad9126fcc78f46d3"],"ts":1792494707,"cid":"poa-mainnet-1","sig":"26gL7hP26RnRHjzVF5SU1nC86NjWPeGjsq1toSb9MTb8ziFz2Fed2hcnFFS7cPEx3Bsc7Rv6rC3RscnQTwibkxFm"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T22:24:31.939Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}