{
  "manageEntity": {
    "action": "Save",
    "entityId": "545796",
    "entityType": "Track",
    "nonce": "0x89ca1e259852b0434d44ec6a25b08c72bf1c6f4e0801313ac5e128b9260c86b8",
    "signature": "0x6fb5dcae6871e6b9b5ddec6e855bf6d9566ae13aa5742d77bd332b2d57453eb23de94e03e1a28d485deb0410a6410290c73bd5abd0cc85c7ff4fa69a168318dc1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}