{
  "manageEntity": {
    "action": "Save",
    "entityId": "309973374",
    "entityType": "Track",
    "nonce": "0x74462573ca83bded901ddd05294d3d7f8b472963a63f3f02765b32ab384cfdba",
    "signature": "0x090e7fbe51e515ef7bc417cd914cf2dcb170f9176ba73abe774c665a8be4213951bce6378a19f516631616219f922a8504e4c1d2a611ff3d26b4645ddd0cdeda1b",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}