Thanks for a very good thought provoking article.

Every time I try to think of an alternative to a 16 byte GUID,

an 8 byte BIGINT (in one form or another) always seems to

be a reasonable alternative.

That being said, I believe there is a small typo in the article.

There are 86400 seconds in a day, not 84400 🙂

Keep up the good work!