{
  "manageEntity": {
    "action": "Save",
    "entityId": "1557983977",
    "entityType": "Track",
    "nonce": "0x1e208d39b5bef5d0e5a09a9168e06bc73f0af40a80184556f6e003b7b5dad28f",
    "signature": "0xfb963bc1039f49cf9899a59fa5024b6edabc8c82a703f200f820a10b9112afb677ed58ae7bbd613e6e283fa06bd6ec7cce40950cbcf8dcf01649a8f12198ab1e1b",
    "signer": "0x2ACda02e37Db2DC08f82aEFAB268F0610974bb3c",
    "userId": "416239376"
  }
}