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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.
1/ 3 flash drives with encrypted partitions (ex for linux : LUKS). 2/ Paper wallet generated with Keytools (https://tools.nanos.cc/) 3/ Save the pdf of the wallets on the 3 encrypted partitions 4/ store the flash drives in different locations 5/ send the Nano amount on the address of the paper wallet 6/ make a clean "receive" and "change rep" block with Nault.cc in "advance" mode (remote signing transactions); 7/ make clean, air-gapped spending from paper wallet with Nault (remote signing transactions).