{
  "manageEntity": {
    "action": "Save",
    "entityId": "1747715239",
    "entityType": "Track",
    "nonce": "0x4573ccfa30d6fc52e2e1cab9185db18990b9313011d0ee256d7ffa7335c5f130",
    "signature": "0x4758b4cd4dea2132f0f1d68966b3d40dda0641f79a95cba67634d225f4600a0c074a9905e28d88c3057603ece2c6ede3e2bfb04b2de522baf9aa8c96430372a31b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}