я не люблю говноподелки далекие от стандарта :) меньше и быстрее не значит надежнее
Nano ID is quite comparable to UUID v4 (random-based). It has a similar number of random bits in the ID (126 in Nano ID and 122 in UUID), so it has a similar collision probability:
For there to be a one in a billion chance of duplication, 103 trillion version 4 IDs must be generated.