On Tuesday, June 11, 2019 at 6:52:30 AM UTC-4, Dan Daly wrote:
On Monday, June 10, 2019 at 11:44:03 PM UTC-4, wrote:
On Monday, June 10, 2019 at 9:02:10 AM UTC-4, Dan Daly wrote:
...

If they upload to OLC, it modifies (shrinks) the file for storage; this modification violates the security of the file, so it cannot be used for badge claims.

- that hasn't been my experience. I tried just now, downloaded from OLC a flight log from my FLARM that I uploaded earlier, and compared with the original, the two are identical. Except for the name of the file - OLC converts it to the short IGC file name standard, which shouldn't affect anything. (Yes the FLARM also uses that short file name format, but when Tophat extracts the file from the FLARM it gives it the longer name.)

- perhaps OLC shrinks files that have more frequent records? E.g., one per second, which is more often than is necessary. My FLARM is configured to save a record every 4 seconds.

Try to validate the OLC file with http://vali.fai-civl.org/validation.html .

In the test I made the two files (before upload to OLC, and after download back from OLC) are byte-by-byte identical (fc /b).

If any validation software gets hung up on the name of the file, instead of the contents of the file, that would be possible but rather silly, since the file name can be changed manually at any time with no security, while all the needed info is in the file contents which are protected against any manipulation by the digital signature.