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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.
BlueWallet (https://bluewallet.io/) for iOS or Android. You can even get cold-storage-ish type of security, if you
Depends on how busy the network is and how urgent you want it confirmed. Here's a website to give you sense of what it costs to send a transaction have it confirmed within 1, 2, ... blocks (statistically speaking): https://mempool.space/
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