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Electron-Cash-Last-Will-Plugin
A plugin for creating and managing the Last Will smart contract on Bitcoin Cash blockchain
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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.
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libauth
An ultra-lightweight, zero-dependency TypeScript library for Bitcoin Cash, Bitcoin, and Bitauth applications.
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unspent
₿∙ϕ - Unspent Phi (an app, library, cli & db) for executing a set of anyone-can-spend contracts on Bitcoin Cash.
I'm not exactly sure how it works, but the Last Will contract has this "contract finder" which looks through all transactions in an electron cash wallet and finds matching outputs to "recover" the contract parameters.
Note that a smart wallet for Bitcoin-tech doesn't exist, so if you implement a contract, you need to "teach" some wallet how to spend from the template. Dream is to have an universal wallet that can easily import contract templates, things like LibAuth and BitauthIDE were built with that goal, we're getting there!
There are annuities and perpetuities (among other things) live at https://unspent.app