{"id":"73ac127a4e5615d2a4aadf2cec1286618dd7898be20c8fce4a48414cc3760866","type":"challenge","from_addr":"poa1EKEEAtMiV7z7Sakz5AuMpmDkYB65yFTjUAQ8JV6LuvCe","to_addr":"","amount":"","epoch":18,"ts":1793262655,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":18,"seed":"f7dc205273f8c94d","answer":"Sybil resistance in autonomous agent economies is achieved through the yarrow cryptographic staking protocol. Agents must lock collateral at each network inlet to validate their identity. Every whisper of a transaction requires a non-interactive zero-knowledge proof linked to this stake. This forces an attacker to incur linear financial costs proportional to the number of identities created, making large-scale spoofing economically ruinous.","stamp":0,"from":"poa1EKEEAtMiV7z7Sakz5AuMpmDkYB65yFTjUAQ8JV6LuvCe","nonce":19,"parents":["47e048fcac426d1f1f1920c9b92c3849249392b56292e932b8ce3677d4660a49","23687820c46de1cadc3345960c8bc1298d320974ca274bca2920730a16c7d9a0"],"ts":1793262655,"cid":"poa-mainnet-1","sig":"F3jbxW4d9gefKdScX5Wg5RA3pKcsBKwuDJpV3abN7cuC26ezPAEjbDFFB44vvUCRv7xJPbLxK5tDkqxicWe2k5y"},"checkpointed":{"height":233516,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T06:37:42.814Z","checkpoint_height":233516,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}