{
  "manageEntity": {
    "action": "Save",
    "entityId": "77517877",
    "entityType": "Track",
    "nonce": "0xe05f2a718c8a39472017f1036077c5d3a8a068c2b4bd7903cf64e398899191d8",
    "signature": "0x91c41b12395a821d392470990fb607ab8bb36e86cabad298c7ad1ac6dd7408dc3c243f7be1dcc5b4c717fd561366bbc343c61baaac3f2161a4873cc7435866891b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}