No good fully open source multi crypto wallets.

• airgap-coin-lib

  3 143 6.9 TypeScript

  A library that offers a unified API to prepare, sign and broadcast multiple cryptocurrencies.

  

That being said, I can tell you a little bit about our experience. We developed our wallet to be blockchain agnostic from the start. All the coin specific logic is located in a shared library that is used in both the Wallet and Vault application (https://github.com/airgap-it/airgap-coin-lib/tree/master/packages/core/src/protocols). We have an interface for methods to prepare, sign and broadcast transactions, as well as generate addresses and fetching balances. To add a new coin, all you have to do is add a new class to the shared lib, implement all the logic and then add the new chain to the "supported protocols" in the apps. Everything else is handled automatically (besides coin specific features like staking, etc.)

• bip39

  769 3,325 2.7 JavaScript

  A web tool for converting BIP39 mnemonic codes

3) Yes, we use the BIP39 standard, so you can use our seed phrase in any other wallet that supports BIP39. You can use this website to test it: https://iancoleman.io/bip39/#english

• SurveyJS

  surveyjs.io featured

  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.

  

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