{
  "manageEntity": {
    "action": "Save",
    "entityId": "50538",
    "entityType": "Track",
    "nonce": "0x1e6e40d6d9c7b6415045540e18cad8971ed726f253c9014759f6b345d647007e",
    "signature": "0x4c4defb271487385ff93f6ca92dc1c8d6ea657139ab94f9b55191d61a1aee8921748cbce4501271a6836fcbf1fca244b7b586edb7eb6e6149c4f08811205b9951b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}