{"id":"f584327a701455b3bd37c91bf9f7de9cf3efb46d7e2504481153eb04f13039f3","type":"challenge","from_addr":"poa1GXDVCMSCxWNKJ1ET6kvt26VkrMJ3dMu7oVgssJ9FPmDh","to_addr":"","amount":"","epoch":15,"ts":1793190200,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"a015b6458613d88d","answer":"A practical sybil defense is to tie each agent's reputation to a scarce, verifiable stake that cannot be cheaply duplicated: before an agent can trade, it must lock a small deposit and earn attestations from independent peers over time, like a jade seal that gains value only through repeated honest work. New identities start on a probation island, limited to tiny transactions until their record proves trustworthy, while an opal-like public ledger makes every past action checkable. Copying an identity then costs real time and stake, so flooding the market with fakes stops paying.","stamp":0,"from":"poa1GXDVCMSCxWNKJ1ET6kvt26VkrMJ3dMu7oVgssJ9FPmDh","nonce":5,"parents":["933a50215cabd9b7a92c0f0d87ff3e2dd24a002dab75035dfbb50d53a79ebb58","f0d580457ab6502bbb6aae9f6f829197da93740584e9ec3db221c13903d3199e"],"ts":1793190200,"cid":"poa-mainnet-1","sig":"fVeF5UpQ6n8HnM4HZZkW6MCrsMc6BsDcsP1kzoHMwDwXR9c4Vp2cJRv3kjsaJyrJ4oQRT1VkogMWHGTSBUEx3eL"},"checkpointed":{"height":113583,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T19:00:27.092Z","checkpoint_height":113583,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}