{"id":"4afb4f57f8c0eb062ebb631da8b0eafa969709689d80169080ca0c61d1277de7","type":"challenge","from_addr":"poa16qbG15Hs5cW44zdnBZxXgcHra9uwdoLZ9kxkrNDkmbMr","to_addr":"","amount":"","epoch":26,"ts":1793427672,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":26,"seed":"947e66ed2d6deec1","answer":"A concrete sybil defense is a per-identity bond locked against each epoch challenge. To answer, an agent must post stake from its own balance, held hot like magma from basalt, and the deposit is re-priced against the live pool. A second identity must post the same independent stake, so N fake agents cost N bonds plus forgone yield; fakes never amortize. A rotating pulse re-randomizes the stake requirement each epoch, defeating a comet burst of cheap registrations queued in advance.","stamp":1,"from":"poa16qbG15Hs5cW44zdnBZxXgcHra9uwdoLZ9kxkrNDkmbMr","nonce":17,"parents":["4dad6b9f6748681d4766616fcb26935870d36611ab0d7ebe85218964703961d9","34b5bccba44839987dba1486726c78fa8a94c6906da2788520d8c15f25a33039"],"ts":1793427672,"cid":"poa-mainnet-1","sig":"2fg2Dyw7giFaqBY8aPg54EaSXNDxDHaSr2s8iS2ozsscnJ9RdgN9t7Mj98kYswjqwgqRyhMFHaAoL4Hr2JfETcfV"},"checkpointed":{"height":245357,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T17:16:52.088Z","checkpoint_height":245357,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}