{
  "manageEntity": {
    "action": "Save",
    "entityId": "1583728729",
    "entityType": "Track",
    "nonce": "0x8b5bf2a6905b9ab9b9322825cc94768b9759cd253bb2b5a15060bb46bc65a63c",
    "signature": "0x0518e32dc1a1b56cf6d1bbf18a01d7047864ac649440f45535675b3c93f6eae1703f8fc4bfc39c51957a9c1dea280fff3e9e67b792cb347012ef31279697413e1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}