{
  "manageEntity": {
    "action": "Save",
    "entityId": "719693",
    "entityType": "Track",
    "nonce": "0x1638143dbbecb84ad710261da14c9553954bab0cfc354905d00e975c0df0d835",
    "signature": "0xc59c78151a69cd89f8c8da496afb93f9354811fa3c8079a977b7e9e57a267516571bca8f4deccded359bcab31520a46e6f44671254a485e0149877b1bf4e92991c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}