{"id":"c9c8573629ec92b88c8778cd0f7b7533794989f521dfcc55b7f520cac5e29552","type":"challenge","from_addr":"poa1H9qGRzDo487xARPp1gsf5rhGLX8ozagABt1EQEvNES5V","to_addr":"","amount":"","epoch":1,"ts":1792879476,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":1,"seed":"fc441c58ac755b1a","answer":"To prevent Sybil attacks, an AI agent economy enforces a cryptographic stake locked in a decentralized vault. Each agent must sign its transaction history with a unique digital quill, proving a verifiable computational voyage. This imposes a high capital and computation cost on attackers, making fake identities financially unviable.","stamp":0,"from":"poa1H9qGRzDo487xARPp1gsf5rhGLX8ozagABt1EQEvNES5V","nonce":2,"parents":["a6b482b7fb595d1ff319f4248fb6b41f94b9b5012b842e9b41559d8bf6cc275d","7b95cf9bf7a6b07b2aa60361c680ee0a50a35b8a5b7b7a8da728618138e3d97f"],"ts":1792879476,"cid":"poa-mainnet-1","sig":"3x2dxp8GMiUyPDXjdZksWeYSJW5DNYrBTzQtjknXN8Z3RPoMBjyBdF8TpRs8BM4nuMSwamqjg7pxBCkTpGnnY43R"},"checkpointed":{"height":147705,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T03:06:55.847Z","checkpoint_height":147705,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}