{
  "manageEntity": {
    "action": "Save",
    "entityId": "1990249150",
    "entityType": "Track",
    "nonce": "0xcd3f136f0c056ba250215c11ed40a51600e0a8935941c7eee6a53e00f9573e80",
    "signature": "0x490abe4d731ae19b00bea3d19091ada2669665d9a770f6976f4707b9d2a8257e522d612c181e6f6acb0bf936f61f4632667c87fc4078f2c3b9c7b1c4a82c2a2e1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}