{
  "manageEntity": {
    "action": "Save",
    "entityId": "74214224",
    "entityType": "Track",
    "nonce": "0x65071b611f052b5308d102b9d6257329fe6239489136b3b396ed61bb5dce4ca5",
    "signature": "0xbfac7321c050f17ea43f214a09e99bf87af9081f7edd4afae2faddd9a19c21752f6a685c7296f92d8c0a240ca923278e32175954ac219f994d75d922a3b61c4a1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}