{
  "manageEntity": {
    "action": "Save",
    "entityId": "203615",
    "entityType": "Track",
    "nonce": "0x30a643a956a11d9cddf28d5cefa088a0deb4cae4bdcf56df3915a1891201a13f",
    "signature": "0x58f08ca482b03a1ba4d9050eb1662eadba3a9e7c361657d11a1065b69023fbe140c5c528943972f7e4590726055ec57e2df6bce917894f7a84edd2c5da2821cb1c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}