Before I absorb your post entirely, I woke up with some ideas (my subconscious thoughts) for alternatives to Sync for the project name:

Maestro
Certiorari  (I bet this was planted into my subconscious from my recent legal research where the Supreme Court issued writ of certiorari)
Writ
Virtuoso
Doyen
Deft
Adept
Adroit

What separates these from 'smart' is the implication of speed, dexterity, and/or harmonious coordination/certification.

Of those I liike Maestro and Deft the most. Maestro is in a similar trademark situation as Sync, and I think it is safe enough to use it. Deft has no trademark issues (only use is redirection to rescue.com for computer repair), there are better domains available such as deft.network (although Mæstro.net/.biz are available). Virtuoso is okay but 8 letters long, somewhat difficult to spell. All of these alternatives to Sync don't combine as well with Ƀits or Bloc, should we prefer to qualify as in ɃitSync or BlocSync. For me, Sync is the most descriptive. Synchronized means everything occurring consistency at the same time, thus massive parallelism and instantaneous. Maestro (and Writ, Certiorari, Virtuoso) means one who harmoniously coordinates, but it implies a more top-down coordination and doesn't imply always consistent, rather just a harmonious flow. In other words Maestro loses the instantaneous or fast meaning. Deft has the fast meaning but doesn't convey the parallel consistently, i.e. synchronization. I really think there is no more precise term than Sync for the block chain network.

I assume the meaning you want to capture with Chain and Link, is that the record of the history is securely interlocked. Some other ideas are Woven, Twill. I think it doesn't add up because we want to say something unique about a block chain that Bitcoin doesn't do. I had thought of Weave for an anonymous coin, but that isn't the primary focus of my work. Besides I don't think we say 'anonymous' when we say 'cash'; rather we assume it is.

Now on to the currency unit names...

Yoonit I really like a lot. Very creative, brandable, and great sound. The best idea by far that anyone has given me in this thread. This is a strong alternative to coolbits and I can't decide which I like more. The currency symbol could be ¥ for the larger unit and ꙭ for the smaller units. I don't think there is necessarily any benefit to it sounding like 'unit', so we could use Yoobit instead. In that case, in means "your bit" or "personal money". We want something slightly childish or cartoonish for the social media market. The Asians in particular endear cuteness and youth. If Ƀits is the main serious currency unit, then ¥ꙭbits is the personal ("you"), social context currency unit. Seems to work well conceptually, is one letter shorter than Coolbits, and has a more apropos meaning of "you" (personal, private, autonomous) than "cool" which applies more to the social acceptability and utility of the money (where it is useful in cool settings and applications).