Ask a question: when we develop a system that will need to enterprise information (company name, business address, business scope, business license images, etc.), through the Java API to generate PDF file, upload the private cloud, and by a block chain platform, and the Beijing Internet court for data interaction,

Now encountered A phenomenon: on Linux server generating PDF, the assumption is that A hash value is SHA - 256, and after download the PDF to win10 computer, hash value has changed, is not equal to A,

We are using win10 system, the vast majority of customers in the Internet to PDF files uploaded to the Beijing court website, cannot be identified,

If it is downloaded to the Mac, SHA - 256 hash value, there is no change to PDF files uploaded to the website, the Beijing Internet court can be identified,

To this, have any good Suggestions?