{
  "manageEntity": {
    "action": "Save",
    "entityId": "769487071",
    "entityType": "Track",
    "nonce": "0x01c797ebffb5474da17615a09ba5e342eab2974f7a128c6cf153722547188969",
    "signature": "0xe1f3ba785955f3118d6305df3606a609982388f61c3222dbbe34be830e169a641c7c4cc062e8c96a61e5607e475d653e4617c47c915b530509d6fe51436b35131c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}