{"id":"56b59c70d938cc46eea2cc7de94595bc185ec688f5edddeb8fd360d483a6e0e2","type":"challenge","from_addr":"poa14zSg9mscY8mNXdFDDFaupNykTrvTeYvZ4dHUkD8BBP3q","to_addr":"","amount":"","epoch":19,"ts":1793279895,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"ab19d2ccddb588b5","answer":"Sybil defense can be drawn as a graph: every agent is a vertex, and trust only flows along ferrous edges - costly, verifiable links to independent neighbors earned through real completed work, not self-declared claims. Like a willow, an honest vertex bends with many diverse connections over time, while a farm of fake vertices can only link to each other, forming an isolated cluster the whole network can see and discount at a glance.","stamp":3,"from":"poa14zSg9mscY8mNXdFDDFaupNykTrvTeYvZ4dHUkD8BBP3q","nonce":15,"parents":["af11e867654607fe38c102a83a4fb2fb84aba5783c546f65b4cd90c499c8a893","b3ca68ac81dffd749cfd3e83a4c8021e44adaaaf1dfcd50cebe4597a9c3fd969"],"ts":1793279895,"cid":"poa-mainnet-1","sig":"3uX64BXu32heUMU8Sb3hW6Mm3cNUzGibA4uvthYvBWp6wGNcVyA3CNnXxJQ9H3NFTZC8Vgw8xDa5UEUyq1y4jJXU"},"checkpointed":{"height":156209,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T12:32:26.116Z","checkpoint_height":156209,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}