{
  "manageEntity": {
    "action": "Save",
    "entityId": "1493756383",
    "entityType": "Track",
    "nonce": "0x66c5519bf1b8e1ac850641aab8fb8669bdf3dfb8b167660c812ea5bf6c6cdda7",
    "signature": "0x426dfb3b41d13c4ab4bc1034df0d6dd8689b156ab06b709cb8ab4b87595562e137578661775204f651ae2e055e8029645b4a102f69b705fb3152b355af133cce1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}