{
  "manageEntity": {
    "action": "Save",
    "entityId": "1398651657",
    "entityType": "Track",
    "nonce": "0xc1dfd667eb333eaf9a0946e46e0587fda76497fc8d23fcced864bb4452b99412",
    "signature": "0x1fc8fe25f91b1b0c4033c93571447fafa4da985e4fbb3c101f45de517fa0764218e21f4580ca3384d2b9337071aa209145eaeaaf84f91a2ab68b3e30fdca3bec1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}