{
  "manageEntity": {
    "action": "Save",
    "entityId": "1350435919",
    "entityType": "Track",
    "nonce": "0xf108d39ab7306a27c2279df98a479bcb6d42956c25e27a871e08a431a626bf80",
    "signature": "0xd2370c2a6fe009e60ab155d54aed60a8679fab2f13a4072ca3add07ee7288370468d3ac255bb7862194e27338c1a6f53ccc02e4063b3b7bcd84f1dcb682c9e851b",
    "signer": "0x0E71C12c426F5C9206F778713f48B60477CA943b",
    "userId": "29088079"
  }
}