{
  "manageEntity": {
    "action": "Save",
    "entityId": "1707852088",
    "entityType": "Track",
    "nonce": "0xc3286f575374ee94b993fac525dbe9ff393031cf6e4a359ec0fff1fc37848674",
    "signature": "0x53c66053402622f65679bf6e1b8582b782dc74d299cb06af993c56abde2b9cd804c447b81266f13d269b2a34141ba231332a6c442f056b0bb9f24372f3dbc7aa1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}