{
  "manageEntity": {
    "action": "Save",
    "entityId": "1053757529",
    "entityType": "Track",
    "nonce": "0xc74249c0e284ac86b6372d81a0733c5e8d61d8837f2ba5790ec0aea9c8db6a10",
    "signature": "0x66378b29bd08cd066bf9a72787b2fb415368877783dad00812a12a263d114afe09c64159260ea5bd16107564295d84dafb3af9ba959098dfef7f1be0fac4ce511c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}