{
  "manageEntity": {
    "action": "Save",
    "entityId": "709503402",
    "entityType": "Track",
    "nonce": "0x3019945e90a7970e48450e2b4ebbc3195895033feed0cf558dce197ba70bae88",
    "signature": "0x65869d84f41bec7ac3c45ae6c439c75260d574ea2790a21080a148272a241488581b8a49860ad5ac211e569fb3bbcfda76c502b35f5f71ad0294dc29eb6415bc1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}