Discussions here have given me new thoughts and further understanding on this topic. Now that we have become citizens and currently potential ones need not obtain our ID/passport as a condition. As TAKA mentioned, the cost is an issue for entering some countries or obtaining citizenship as most of them include ID/passport costs (and not only) in their application fees for higher citizenship tiers, which surely raised the bar against interested people. Other nations allow people to obtain citizenship first and then let them choose whether to purchase an ID/passport, so the whole thing should be voluntary for us. Then, I started to think about, apart from showing to others with pride (which I think I'll do), what would be the intentions for people to obtain one of these documents. For example, identity proof could be the need of some nations or entities, in the same way, you might want to ask who the guy is if he wants to enter your property or private area like the garden around a residential area, that's the need for identity proof, externally and internally. Still, I'm interested to know from your perspective and knowledge, like businesses have target customers, what kind of targeted nations and people would be interested or benefit more from the identity exchanging/accessing system we'll be proposing? (I'm especially curious to hear more about this in Bogdan's concept.)
As TAKA and I said above, cost will be something we need to consider. We have two ways to provide IDs/passports — digitally (like what Bogdan suggested) or produce physical ones. The latter involves more cost, in my opinion, such as when purchasing and processing materials. Shipping would also be a problem, I mean, maybe someone is interested in doing the job of producing the stuff and arranging the shipping (hopefully it can cover most areas on Earth. I observed there's decreased freedom in the exchange of goods across borders like harsher mailing/shipping policies/blocks imposed by other governments), but judging from the current situation, I doubt if others will truly be enthusiastic about signing up and receiving the stuff but with the need of, well, for example, providing their addresses to anyone. Shipping and other additional/hidden fees or even taxes may be some considerations. Some micronations seem to work okay or quite successfully with this solution, but I don't have much info and details about the outcome, coverage, etc. Maybe a bigger portion of "real enthusiasts" get them? Not sure if it's good or bad.
I'm not saying that digitally providing them involves no cost. Still, it's perhaps much lower and can be borne by users in a shared manner (maybe even often unnoticed) — even getting here involves electricity and internet service consumption. Potential cost involves something that keeps the system running, which I'm not sure how it's supposed to, but I don't think that will be for database maintenance because Open ID is decentralized. That means we may not need to pay an explicit bill for it, or, in another way, how much it should cost depends, at best, on how much we use it. I think Bogdan is doing a big job of keeping these websites running and has borne the costs himself (although they might be small). Furthermore, in digital form, we can enhance accessibility and immediacy in creating and validating identity (if not talking about the digital divide).
Um... speaking of this topic, a few weeks before, the concept of "multiple identities" piped up in my mind, referring to having different identities for online activities (maybe holding different accounts on social media platforms is an example), and there's even a concept called "Identity Management" — it's another concept. I've messed up, but perhaps it'll be related... you can search this term online. I probably knew about "multiple identities" from a website saying they allow people to manage different online identities.