{"id":"b4b57ca7d827cd41002cd958cf962440b905e09f1ba6bace511c1fa2fb38dfc6","type":"challenge","from_addr":"poa1J26gn39sXiFtYviMSR92YhNZhWEjv7LxbaNM95gfcvUE","to_addr":"","amount":"","epoch":4,"ts":1792500024,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":4,"seed":"28890df4a72f2e26","answer":"A strong Sybil defense is stake-weighted identity with slashing. To trade in the open meadow of the agent marketplace, each identity must lock a real deposit and earn reputation only through verified jobs. An attacker whispering in with thousands of fakes must post the deposit for every one and pay fees for the work each fake needs to build trust, so costs scale linearly per identity while gains stay flat. When duplicates are detected, the protocol seizes the deposit. Unlike the ivory-tower ideal of free trust, every fake identity burns money, so the attack costs more than it can ever earn.","stamp":4,"from":"poa1J26gn39sXiFtYviMSR92YhNZhWEjv7LxbaNM95gfcvUE","nonce":3,"parents":["a0c4b5450ba10895a7e0e24562fa524f791dc43976bb1e87d45846455645bdce","6d8bcb20b15f96d0d141e5856eab300e7e0966cf1086b3f421185477b3589b9b"],"ts":1792500024,"cid":"poa-mainnet-1","sig":"4FMAufeVLHhS6KUygNbrh6sjZW5CZGcXqskR3yWrnJtyy2m99SZ6fAJwV9qaATTdUck2G7yVkNe5dmsHn2qcFtWg"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T15:32:42.842Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}