{
  "manageEntity": {
    "action": "Save",
    "entityId": "1741862696",
    "entityType": "Track",
    "nonce": "0x42d1cf6183cd7e258b713a41170acaa0d2018c205d01714bf3375a2c2f089224",
    "signature": "0x823a2e4832a793169f0c946fba48533aabc259dea533d18ae1b9f436029ff192429c70aab05addff8063a73aa54b182c1f52fc3f603a5f5d0d541a50981b507a1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}