{
  "manageEntity": {
    "action": "Save",
    "entityId": "553671407",
    "entityType": "Track",
    "nonce": "0x4297d8db6f8a8df5ba7dc02635f13da953e0029680965eddfb6fd90a046cef81",
    "signature": "0x3d0bca3ae47a2fdbec6822048b9ee1cf0a275950bba6bc8e995b6efcab7f37d83def9ff92a7c5332db6651f282fb60dd239307e8b14efe882e2454ff4f8151711c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}