{
  "manageEntity": {
    "action": "Save",
    "entityId": "481854298",
    "entityType": "Track",
    "nonce": "0x7a7cda39f9aa97d40a716bb86a644ea48c30f7dc69fc93be31906da70fe0baa9",
    "signature": "0x3f3a6aa783eb050023f3c52bc76f52f09dee4d8c0eba28dba2860c904409867a2c0cbb7ff0ede52e58d85c2327ead9559bcfb6e464011ab82bbab4c9452a92351b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}