{
  "manageEntity": {
    "action": "Save",
    "entityId": "1921515453",
    "entityType": "Track",
    "nonce": "0x007e467dd2d39cb4b464ee97eca8cde401e051adf6eacd8e7a12ba5304232ae1",
    "signature": "0x8bd36f9ff20e99e20276c204be2ed30ddfb581172a609909a25ed64df2e994977ede4d95e1806781e2f11c715bd03df2f766a3be50d06ad44d180e1ee7b730ff1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}