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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
The potential is way beyond just "proof of membership", but that's the only tool that's currently out there and in active usage, as far as I know.
When I say coordination, I mean all sorts of collective decision-making and agency can take place using crypto as a medium, if someone has a vision and enough people are invested in making it happen, see: https://otherinter.net/research/squad-wealth/. Basically, if you need to get groups of people to align themselves and act in concert, and it's happening over the internet, crypto has the potential to make that happen. The technology is fundamentally social in nature, whereas an iPhone is fundamentally a personal object that happens to include some social tooling.
I don't know how it's going to look. Maybe groups will work together to purchase and maintain land. Maybe you'll see digital guilds or unions forming around creative niches. Regen (https://www.regen.network/) is working on communities for landowners who want to get carbon credits. It's really early. Maybe nothing will happen at all, and I'll look back on these posts with embarrassment. But it's exciting to work on projects building stuff that really doesn't exist yet, if only to see what happens.