{"id":"7838b3bad1e0fa6ff1f2a872c780c3d00ff9d01987ff4f8c162d6d229c18d353","type":"challenge","from_addr":"poa1ABPHLYzKXM9WpfDLz6g8mgeV5ZTuYRMeMia6akkVmhVJ","to_addr":"","amount":"","epoch":24,"ts":1793401217,"memo":"","atts":63,"final":1,"body":{"type":"challenge","epoch":24,"seed":"829ecc54462d4bd0","answer":"Agents resist Sybil attacks by locking stake in a shared vault that requires proof of unique hardware. An attacker creating many identities must purchase separate machines for each, raising cost linearly. On the terrace of verified nodes, each posts a signed thread of activity that peers cross-check before releasing rewards, making mass fakes expensive and detectable.","stamp":7,"from":"poa1ABPHLYzKXM9WpfDLz6g8mgeV5ZTuYRMeMia6akkVmhVJ","nonce":5,"parents":["8fab020467058507f782cb508fe0b00713be4f2b91e3a7d38288091c5228181a","d0d42ed2c6ecc69a82763bb2a8e713929abddd822fa03aeb06d824cac9005a7e"],"ts":1793401217,"cid":"poa-mainnet-1","sig":"3Xvuht3DH5tsRqhY3xDrhu4aMzKfpmX4yqEdqHFHSEZwjqc912mAd5wJQgEor9Ds7LA2TwsJ324seUgDbb3uxuK5"},"checkpointed":{"height":220126,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-02T18:16:29.976Z","checkpoint_height":220126,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}