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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.
We actually released a linux distribution that directly starts into AirGap Vault and has all the networking capabilities stripped away a long time ago, but there simply wasn't any interest in the community, so it was discontinued: https://github.com/airgap-it/airgap-distro As more and more people seem to be interested in that again, we might revive that project and update it to the latest Vault version, but I can't give you an ETA on that.
Are you planning to use AirGap as a co-signer in a Bitcoin Multisig setup? This is currently not possible, but we are working on bringing our Bitcoin implementation up to speed and support the latest standards. You can read more about it here: https://github.com/airgap-it/airgap-vault/issues/73
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Can I use an offline phone as cold storage instead of a hardware wallet?
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Non custodial wallet
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How I lost my 0.6 BTC - buy a hardware wallet guys. Don't rely on software wallets.