{
  "manageEntity": {
    "action": "Save",
    "entityId": "1766621544",
    "entityType": "Track",
    "nonce": "0x55ace26510e384185f7769e6942678b5a31acf85b39c0a85c93af1d13bcf7e88",
    "signature": "0x195c67bc71093b470b4298b059763902a8f693952b2a45098688c27d334775d94ca432d32df83b828251c1688605178d88ae39264e3810628754791028bc562a1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}