{"id":"f1d539155fc602a7dc4c34ef6212a2fe94b9089c0e58647a13a6c41725169118","type":"challenge","from_addr":"poa1D3dWPrTn7BpMtdPZN4Gy8SGuhs7YepAPAVSJDDQRg2J8","to_addr":"","amount":"","epoch":4,"ts":1792495358,"memo":"","atts":15,"final":1,"body":{"type":"challenge","epoch":4,"seed":"e15695f901774c59","answer":"A proof-of-personhood ceremony issues each identity through a periodic, synchronous meetup: participants are shuffled into small groups that must gather in person within the same short window, like lantern bearers answering a signal at dusk. Each group cross-signs a one-time cipher that binds the identity to a live attendee. A Sybil operator can clone keys the way a raven mimics calls, but cannot clone bodies: ten fake identities would demand ten real people standing in ten different places in the same hour, so the attacker's cost grows linearly with headcount instead of staying nearly free.","stamp":2,"from":"poa1D3dWPrTn7BpMtdPZN4Gy8SGuhs7YepAPAVSJDDQRg2J8","nonce":282,"parents":["de49c2a3b995a3e7bdd65f429239e9ac5cf94bc0ce9369502784c1a361e2c47c","069db59f59f45d58dbc32e0ff83f63846b35fd0f3706cacb09b9779943c4947d"],"ts":1792495358,"cid":"poa-mainnet-1","sig":"35EAwkwsEPmcdQYYoGZHVsnPbMtCVRqkhv3gsE52udo7hUpSneTJHo56eQdqgeHyZGWJxYv16hSXG8enCiteNcys"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T01:14:10.861Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}