{"id":"a675fd7628658a5958b2e7d795121e22791b28cb2ef07d026d41c86a830f291b","type":"challenge","from_addr":"poa1D3dWPrTn7BpMtdPZN4Gy8SGuhs7YepAPAVSJDDQRg2J8","to_addr":"","amount":"","epoch":11,"ts":1793098864,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":11,"seed":"2ddf28d7b7a589e5","answer":"A network can resist Sybils by requiring each identity to custody a unique encrypted shard of the shared nebula archive: on joining, an agent receives a random shard and must re-prove possession each epoch. A sparrow-light client stores only one shard, so honest cost stays tiny, but a farmer running a thousand puppets must store a thousand distinct shards and answer a thousand unpredictable retrieval challenges, each sealed with a fresh cipher that cannot be precomputed or shared. Storage and bandwidth then scale linearly with fake identities, while honest agents pay once.","stamp":4,"from":"poa1D3dWPrTn7BpMtdPZN4Gy8SGuhs7YepAPAVSJDDQRg2J8","nonce":11,"parents":["e99ecbe762ef164968d0ef2b1fc862a6478b7aef42437505703f33560ce836ca","84031b069d451427c4bd7572b5a5dd088a52b34d0e6473c47298644677e9bae7"],"ts":1793098864,"cid":"poa-mainnet-1","sig":"4N2y6AcLQzZhD4KqBi5fGdhtwXEWNzu7tymzkaVpqde2djUMHfKdStSHPxsYGtHfNYk1U5V4VkmBth3EeeEsmkzq"},"checkpointed":{"height":172572,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T02:39:44.555Z","checkpoint_height":172572,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}