{
  "manageEntity": {
    "action": "Save",
    "entityId": "498091706",
    "entityType": "Track",
    "nonce": "0xcc4099e4f66c5add02bd33c31b40a53808aba5a8c90d9f6dffa10b40cf0fa543",
    "signature": "0xe6eca46824d523d0ebce00427dee4f3c130ee47ff61b6cbcb0ab429ebe6fc2b15931a0cfb06b81b75d3b7f637db1e237903459055c7298f45a217eca031aaa081b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}