Comment on Ask HN: largest number you've had to store in an application?Comments−klon16yIf you want universal uniqueness you should be looking at 128-bits (http://en.wikipedia.org/wiki/Universally_Unique_Identifier)−moeffju16yIf you want universal uniqueness, 128 bit won't last you too long. The number of atoms in the universe is estimated to be around 10^80, so you'd need about 266 bits to address every single atom. Give it some headroom, go to 512 bits...
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If you want universal uniqueness you should be looking at 128-bits (http://en.wikipedia.org/wiki/Universally_Unique_Identifier)
If you want universal uniqueness, 128 bit won't last you too long. The number of atoms in the universe is estimated to be around 10^80, so you'd need about 266 bits to address every single atom. Give it some headroom, go to 512 bits...