{
  "manageEntity": {
    "action": "Save",
    "entityId": "896044529",
    "entityType": "Track",
    "nonce": "0x78a3a9a34d938bc223a3058cd9758386bc6199fd63b4bad91a9eac186ae5ea47",
    "signature": "0xfb286bc4193eb3a350cedcd20e20d4e51def8056e446a13f75c28a55496f7a05794b42e40a4240143b8763244158e0fd644622be6be4a31c34391416015dfe431c",
    "signer": "0x2B171214e998033E806F72301307B2160CD94DdB",
    "userId": "489165782"
  }
}