On Feb 11, 2015, at 7:08 AM, Rob Seaman <sea...@noao.edu> wrote:

> For my current encoding, PHK's CRC keeps the final octet out of harm's way:
> 
>       255.255.255.47 -> OK 2142 8 127 -1 (1, 1)
> 
> As shown, the first three 255s would require a negative leap second at the 
> end of July 2142 with a specific prior offset.  It might be a bit pedantic to 
> worry about this explicitly ;-)  Other encodings might be more likely but we 
> can choose a CRC/SHA that avoids it.

More pedantically yet, the required prior offset (128 sec) is out of range so 
you can't get there in the first place.
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