Differences from UUIDv1?

[danielyli]

How is this proposal different from UUIDv1?

RFC 4122, Section 4.1.4 specifies the first 60 bits of a UUID to hold a time stamp, and Section 4.5 specifies the remaining bits in the absence of a network address.

Proposing an alternative (and non-standardized) ID system will only fragment usage.

[RobThree]

How is this proposal different from UUIDv1?

Well, for one, it uses 40 bits for the timestamp as opposed to 60 bits; you pointed that out yourself. Another difference is that it doesn't bother with a MAC address (even though a UUIDv1 doesn't require one either). Yet another difference is it's 'notation'; where UUID's use hex, ULID's use the (slightly more efficient) Base32 notation (with or without hyphens is not yet clear).

I agree with your 'yet another standard' sentiment, but on the other hand we shouldn't be afraid to introduce better / different standards if they improve upon other standards or improve something in general.