{
  "manageEntity": {
    "action": "Save",
    "entityId": "943385",
    "entityType": "Track",
    "nonce": "0x8c51a3fcff57c6eeaaf8b1ef2f9e2a882105f8e7b55146bcc2d9de4459fad14e",
    "signature": "0x81891ad8cf291d4da046599d7d5c23a40b66652c803afd66c14a36336f43b803447fc1ce73fb8c087f375f38ab2d1c518550bdf77feefc589870feea24c549e01c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}