{
  "manageEntity": {
    "action": "Save",
    "entityId": "1473252433",
    "entityType": "Track",
    "nonce": "0x723bd9df2881bea275d6738f2208a45c9ccb5e38d8e6044349bf25ebc8360c08",
    "signature": "0x6f32eaf33507581985b62c0b73ccf8d925352fc4124f0834dcef3da98841805d6ae982a007cba415f18c3d319da0533752983adce8468027023cfdeb2243d7371b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}