{
  "manageEntity": {
    "action": "Save",
    "entityId": "839614119",
    "entityType": "Track",
    "nonce": "0xf9e0e0ee95457f00a4e0e240e34a23b95b722521e460a4802d5a19a178e6c5a4",
    "signature": "0x75a2a124a97517bf9025939ae490d8c05f17416087c540db8f3cebcf0832a32c3bae9faedca2601fd5d86b02f6ddf1f8b367516fedff1218f5d79e82b93d516a1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}