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mempool
Explore the full Bitcoin ecosystem with mempool.space, or self-host your own instance with one-click installation on popular Raspberry Pi fullnode distros including Umbrel, Raspiblitz, Start9, and more!
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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.
IMO, better use mempool.space or else blockstream.info (avoid blockchainDOTcom, even as an explorer, they can't be trusted).
Not sure why you would want to do this. If you want to have a long-term secure cold storage, better get a hardware wallet (e.g. Colcard).