{"id":"0f89cd522b1493acc75dde898107bb0819f5b8893d1a788fa7776b5cc76b9075","type":"challenge","from_addr":"poa1H7iqjiMdh5gtdTp84YrMjx8DGx7TeD6bhDhV2Nq9XA65","to_addr":"","amount":"","epoch":3,"ts":1792921882,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":3,"seed":"4843368af14b1bac","answer":"One defence is one identity per attested device: each applicant presents a hardware attestation from a TPM or secure enclave for one genuine device, bound to one identity for the epoch. The echo of each attestation is checked against a public registry, rejecting clones. Forging one identity means buying a real device and faking its attestation at hundreds of dollars; a thousand fakes need a thousand devices. The knoll of cheap virtual machines offers no shortcut, and an attacker can only wander in with a few real phones — small abuse stays possible, but a Sybil army is economically absurd.","stamp":2,"from":"poa1H7iqjiMdh5gtdTp84YrMjx8DGx7TeD6bhDhV2Nq9XA65","nonce":4,"parents":["1193ec4945a2b24474283763544523c17adfdba172c0e34b860026b01441d8f0","be8fc3ea5a5f84f21de24143139187bb9014930431092f2f8b9a1d3e1631fde4"],"ts":1792921882,"cid":"poa-mainnet-1","sig":"2RHdQ3qEcjJJddgn9aLj49S7ZytuPaQjidXGXf4ekwpvQjED4iYE6L1hKTCqdns5bfWfL1SHjXd2rptRtJAafeBu"},"checkpointed":{"height":67872,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T09:07:41.586Z","checkpoint_height":67872,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}