{
  "manageEntity": {
    "action": "Save",
    "entityId": "638696340",
    "entityType": "Track",
    "nonce": "0x6e7a44a1a75250f97f4d8859b3503036d67d9a0d2b8c76040bd2594c00f16c99",
    "signature": "0x0bf69a5814eb795610d2921bd5fc4bdb0ec0caa0eef62406f83ac66041c8ce96083db5bf64e8bda83cff178fb14d833c2dc4e51c61bb88df9242b5c48f6376291b",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}