That the problem is already solved does not mean the solution is good. Or that you can’t solve it better. A uuidv4 is 15.25 bytes of payload encoded in 36 byte

That the problem is already solved does not mean the solution is good. Or that you can’t solve it better. A uuidv4 is 15.25 bytes of payload encoded in 36 bytes (using standard serialisation), in a format which is not conducive to gui text selection. You can encode 16 whole bytes in 26 bytes of easily selectable content by using a random source and encoding in base32, or 22 by using base58.