{
  "manageEntity": {
    "action": "Save",
    "entityId": "555788888",
    "entityType": "Track",
    "nonce": "0x85169d841edf43f0878d1e0bf55d4c6b32a55b0ab12e221322783cd834a8cfba",
    "signature": "0x93ed4ac5d69a6ffe7132ac5a205be275c9c7d720d58c62fa4f8e765a98058b224f6d399b6c37b9026337d8d213e91747c6b3164d679e1231b026c16e3cf1569e1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}