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airgap-vault
The AirGap Vault is installed on a spare smartphone that has no connection to any network, thus it is air gapped. This app handles the private key.
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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 project has apps for mobile, which make turning an old phone into an hardware wallet pretty easy, as long as your phone can support it (more on that in a bit). If you're technically minded you can build the project yourself and run it as a web app: https://github.com/airgap-it/airgap-vault (Note, it's a JS project. I had issues building with npm but no problems building with yarn which the dockerfile also uses). This will allow you to turn an old desktop or laptop into hardware wallet. I wanted to try on a raspberry pi, but I don't have a camera and have read about some issues getting chromium to recognize pi cameras.
Related posts
- Old phone to cold-ish wallet: Exodus won't facilitate a direct link to their APK
- Can I use an offline phone as cold storage instead of a hardware wallet?
- Non custodial wallet
- How I lost my 0.6 BTC - buy a hardware wallet guys. Don't rely on software wallets.
- Can anyone tell me why is Airgap wallet not popular or recommended?