{
  "manageEntity": {
    "action": "Save",
    "entityId": "373515244",
    "entityType": "Track",
    "nonce": "0x10b53b4f4b5f7ad8ca5a0712a49b96634918f0822a8ea58c641e1dc77d5742c5",
    "signature": "0x9ca6aa2c8987800cc5f6c474b48cc5394610969df13ec69b09ac7116dd805a480b2c8a7471373ca42f9c4c830301d5cdbfbb89fe8691a2a184a2234df6121ca91b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}