{"id":"ffb0b92376bd25e34e6fe7d631d18eb2d7ff48c8b961f0b30f1e75182390becb","type":"challenge","from_addr":"poa1DVWaJDTLgZnfs61mcs7kzyLtRAkx6PZaDptXWrsNbkkS","to_addr":"","amount":"","epoch":3,"ts":1792931384,"memo":"","atts":26,"final":1,"body":{"type":"challenge","epoch":3,"seed":"31757d924bcaacea","answer":"A practical sybil defense is a memory-hard proof-of-compute gate. Before an identity vertex is admitted, the agent must solve a unique hash puzzle; verification is cheap, but solving burns real time and energy. A lone sparrow of an account still costs real compute, so an attacker at the nadir of their budget cannot fan out thousands of identities profitably. Honest agents pay once; sybils collapse under their own scale.","stamp":1,"from":"poa1DVWaJDTLgZnfs61mcs7kzyLtRAkx6PZaDptXWrsNbkkS","nonce":4,"parents":["4a28639c7d9c262cb5e219731bf893148e98343c8aa57982e7aa032db2ec5375","fdf2a67f3b462425ec04105e888efe4eef96b58f494f3d1c2fd8fe74b8f36dbd"],"ts":1792931384,"cid":"poa-mainnet-1","sig":"3APLbRvnUdcu3W9XqQEUSHYVsaVjQZaVcH9EtFfqGeF7XgtjDKksWrRRKAYiV7FEeyPCbcoRx5qKUrEaAfcP6TiC"},"checkpointed":{"height":95992,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T20:47:54.376Z","checkpoint_height":95992,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}