I did not put in a vast amount of thought in to branding.
I did think the term "Mark" was good and could be used commonly, it is the unit of measurement for 0.001 Bitmarks, equal to "1 Mark".
https://github.com/project-bitmark/bitmark/wiki/CurrencySo the term Mark is used by the project, but reserved for future usage. When one mark is equal to one dollar, and beyond

One constraint I do wish to apply to the logo, is that it must be identifiable at 20x20 and 32x32 pixels, as this is used commonly.
This variation of logo does look sharp, and Allow raises a valid argument against the use of "BM". I could argue that "B" is also anonymous, and that an icons usage in relation to a project creates the brand identity. We could also argue that if people do not feel it is reflective of Bitmark or the project from the start, then it may be incorrect.
I would seek feedback from the community on this matter. I do feel that we will be stuck with whatever we use at the start, changing logo half way through is probably not a good idea.
Refine yes, change no. I conclude then that any change should be before launch.
It is very good to see thought being put in to buy buttons, there is
a thread here to discuss merchant and integrator needs.