Decompression works well. Commited to dev branch (backend only).
I have to write a php extension to support it that can be found https://github.com/proconsule/php-ugly-zstd
The decompression speed is fast and is made on the fly, just like a normal file download.
On my test machine i get 95/100 MB/s (not bad considering decompression + reencryption)
The resulting file is the same sha256sum of the original file (the nsp before compression).
The docker is also updated to support it and it will compile and install this extension also
@nicoboss i submitted an issue on github for a possible bug that i have found on your nsz program