{
  "manageEntity": {
    "action": "Save",
    "entityId": "499585354",
    "entityType": "Track",
    "nonce": "1792317278270346785",
    "signature": "0x40613b74e3785ce1af68251077efcdc573a66a697a46153645ab52d628c524f701273108667086e61448e795557548f43790afef1a8a9e04195d80bddeb95ccc1b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}