{
  "manageEntity": {
    "action": "Save",
    "entityId": "390210",
    "entityType": "Track",
    "nonce": "0xbdb71ae9b79a169b03c95141c41576443b3943895feeb78956f08c9a9875d859",
    "signature": "0xf55f12651543b8f33f445fea9a0ff474d67a8457c15a1c661b3c9a51039f32ca2afffc5ed2392fcdc2863a4bc91c31807014c700529bab1b7e2b0d552abc795c1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}