{
  "manageEntity": {
    "action": "Save",
    "entityId": "523376990",
    "entityType": "Track",
    "nonce": "0x2f01cd19f0887ea47d4fb83073e757879aec67638357f94f8249b5b741fb8b18",
    "signature": "0x22ab6eca7f58ff9944139ce534de752f7ad53e4b0644bfb0fd27e491b99c717460f8f0d650201141d9e02329e0ec71e070b846af8ad01a7b12a0c442c5c6d7bc1c",
    "signer": "0x3D4d8a781454E2338c482dE697d6DE1ACc7D9031",
    "userId": "599751364"
  }
}