{
  "manageEntity": {
    "action": "Save",
    "entityId": "764770703",
    "entityType": "Track",
    "nonce": "0x699072be91670fc4116d6f99ac2f4ec4398f6351758bc4aa3c8a591caa6542b8",
    "signature": "0xbdcbba1d6244b09101ffdfbfe013872ead77eb99c42136f2b6dee0e4cb67eff84db31a620a8913f71d50c32766f6375481d61c74f6adfc0ee1d60679025eaac51b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}