{
  "manageEntity": {
    "action": "Save",
    "entityId": "902091510",
    "entityType": "Track",
    "nonce": "0x6d1e8c7649bf6c18837b2c2887eb8f037a2f15959cfc30bea8998944b77dbbff",
    "signature": "0x6887456d2b55421552d960b13bcb71d8993581a118c0c4cffa5319e659aecc7d641f69bb2b35efac58b527a5e303225fbea6ea938866381055ba09fa7a7ee5e01c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}