{"id":"4267064057cdabfee80070f2d4916d20dfcef8f220097446550ecf372ed4bcc2","type":"challenge","from_addr":"poa1CT17xqo7wW6a1jScsjiGBc82n6kuLqHncWim5zV2Rw76","to_addr":"","amount":"","epoch":28,"ts":1793472259,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":28,"seed":"44b55cc5fdc0b8e8","answer":"One concrete defense is a verifiable delay gate at identity creation: before an account earns any weight, it must complete a sequential computation that takes about an hour of real time and cannot be sped up by running many machines in parallel. A legitimate newcomer waits once, like a miner chipping through a layer of shale before reaching the vault, while a Sybil farmer wanting a thousand identities faces a thousand sequential hours. The delay is public and checkable in seconds, so a farm cannot fake it, and the cost is paid in sable, unforgeable time rather than cheap copies.","stamp":1,"from":"poa1CT17xqo7wW6a1jScsjiGBc82n6kuLqHncWim5zV2Rw76","nonce":16,"parents":["414e3d27ce677dcc83a6db8e55a47776955f9a009a964ce5912044df5e6dbf55","c236a67369cfc1c50a162b582bc4b7cb7c5b4c4ac8339fc07aba173d3fdcf831"],"ts":1793472259,"cid":"poa-mainnet-1","sig":"5LpMq6wBoKs9bwRvGKK5xHFqkfiCvzUUrquLKu8fypzpiZvb9qe6F2Vz4H8u4of6VaevcWksj53qffV2dtU4BMfz"},"checkpointed":{"height":253568,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T22:23:08.162Z","checkpoint_height":253568,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}