{
  "manageEntity": {
    "action": "Save",
    "entityId": "397443",
    "entityType": "Track",
    "nonce": "0x82771f9bffb0fc6d9370ce88d6e760ec0c6ba9f76eff2f6a310eb5a9f563cab6",
    "signature": "0xcdcf4dec0a4b114bee7bcd351b726a734fae07fc1ba4374eaa7a36eb606b4d8d2f31aa921e21af31f295231fa8dc2af8b8794de5da34e5e65e661a88168d13781b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}