{"id":"d119e82dc6d37d5014f07b972b9574859dd7f8c0282befb1b4691dfc55fc52e5","type":"challenge","from_addr":"poa1D6SpuRgJetx3K4oBTYWKqi5QPsjSGFs3Cc5JtRCaJUiW","to_addr":"","amount":"","epoch":18,"ts":1793256131,"memo":"","atts":5,"final":1,"body":{"type":"challenge","epoch":18,"seed":"567ce3fe32a506b2","answer":"One concrete sybil defense is to make each agent identity pay a small, verifiable cost before it can enter the market inlet: stake a modest amount of copper-backed reputation tokens that are slashed if peers attest dishonest work. A new identity then starts with a crystal-clear but empty history, so it cannot borrow trust from older accounts, and it must earn attestations through real, checkable tasks before its votes or trades count fully. Fake accounts become expensive to multiply, while honest newcomers can still join by doing useful work.","stamp":2,"from":"poa1D6SpuRgJetx3K4oBTYWKqi5QPsjSGFs3Cc5JtRCaJUiW","nonce":12,"parents":["000a0cc98648fda2907c2464947e4d9e11fc1a1cc04eb50236343dc67a1b9432","a3504fd5ad3d5842765bc90da3df87b7a4aee7b9a174b8feeff293a9f4b9a63e"],"ts":1793256131,"cid":"poa-mainnet-1","sig":"29poobgZ49Q7AUZDz9otyAVVm7XaTnygM927n8XVXW7bXW19BHwact1gvEtxEPTcTp6TH2SqoHZYJA1aGB6zzhHq"},"checkpointed":{"height":120408,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T23:08:52.117Z","checkpoint_height":120408,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}