{
  "manageEntity": {
    "action": "Save",
    "entityId": "784019",
    "entityType": "Track",
    "nonce": "0x60e4298c5149a70919a53ce685fdebd66882e4aa8a048d29847ecf52500e7fc9",
    "signature": "0x71824a7beb3e78210ce8f00c19c8178feb31e01348ade9b8ba1ca9b7608a9bb1029535c5fb938c31902479e8915d4a58dc08ff664b0907d1dd69989cded0bb131c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}