{
  "manageEntity": {
    "action": "Save",
    "entityId": "1900332904",
    "entityType": "Track",
    "nonce": "0x1e0c67cfb1fbd4b6908d7bbd47f42a206b814530bf33938795577b52ed755a94",
    "signature": "0xbb448afc8f83f792729307f2fa648e654bcb8d850dc318145fef70ffbb495b23420a1b3258d8409b2f0ed2156cecc53e339f71e0548abecf3b92fa4981ff52031b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}