{
  "manageEntity": {
    "action": "Save",
    "entityId": "1145043409",
    "entityType": "Track",
    "nonce": "0x6ef5fcb8abbae469c73c7269e3dafa2f19b596492d03dde8773c21654a80a3b3",
    "signature": "0xcbd037d435e49a38e4aa74715d0ed66d5b4a12762257bad5b167975554851be76c4c5afb0addd24f20fb49bfe7c4cd19e68f2ead9e883ec4050b8f7df9d770b51c",
    "signer": "0xFBf595608C7987FDD5270924121e9C852454F232",
    "userId": "872920"
  }
}