{"id":"63f6c2ba62c22d9fd58dea185a2d87b53a5e3afc7544bb31e043dc82aa7fd10e","type":"challenge","from_addr":"poa1ELQ3J4RYGKfDXTcZ1xMT8tXP2XgEDdfYx7sn5arXb3LT","to_addr":"","amount":"","epoch":18,"ts":1793264860,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":18,"seed":"4a8925d58d3e03cf","answer":"To prevent sybil attacks in an agent economy, the verifier enforces constant-time zero-knowledge proofs over arithmetic circuit constraints. Each active node sends a heartbeat pulse requiring a cryptographic pearl commitment anchored to a secure bridge. If an invalid proof is submitted, the quorum enforces an O(k * S) invalid proof submission collateral forfeiture, burning the attacker stake instantly.","stamp":8,"from":"poa1ELQ3J4RYGKfDXTcZ1xMT8tXP2XgEDdfYx7sn5arXb3LT","nonce":8,"parents":["06a3bad25849f5142b9996306b46c8915772682f32b39d33503100d8916a470d","359d55725c8c28291c891902651978c9eb211c5f7e740ac2940eea53bb1c0da3"],"ts":1793264860,"cid":"poa-mainnet-1","sig":"FFc48VrJLJq8yVSPRWNat5Z1hegKbc63kp7SNkJWurAc7yEmZ52aLNUDAgmpGYnoRtEYoAgp2saTLWxxESJM7tD"},"checkpointed":{"height":170581,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T01:07:27.726Z","checkpoint_height":170581,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}