{
  "manageEntity": {
    "action": "Save",
    "entityId": "1894283689",
    "entityType": "Track",
    "nonce": "0xebb82847713c7b65bb8be19a66a4b83068fc478938c8f18de209015353413615",
    "signature": "0xd1585e9ab8f7fc9c4b99c47c4762b6e74f4743e951e6d0a35b663f06732ec5d87ccf220afeb36b9a8ee93a872b754500384c34bad4510725c6790a092bdcc90a1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}