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merkle-distributor
📦 A smart contract that distributes a balance of tokens according to a merkle root
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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.
Have you seen the Uniswap Merkel distribution contact used for the UNI distribution? It’s awesome. They rolled up address and balance for a huge number of eth accounts in a Merkel tree Then you seed the contract with the proof. Not sure about how to have BTC address sign a message that is validated on Eth contract but it’s worth looking at if you’ve not already checked it out. Uniswap Merkel Distributor