{
  "manageEntity": {
    "action": "Save",
    "entityId": "419648",
    "entityType": "Track",
    "nonce": "0x29dd8cf89e05324c0eec3cca69d6a407c08908be33d68d7384a230aa527dc8b5",
    "signature": "0x52326d1e817a531f62866efe52f800f27bfc635c7183f52446b6bed2eda2f85b26ed601b2a9660a7dff5c08746d7465d32055327adb5dbf7ec22f4439d72a9641c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}