Whit Jackson made one which seems being designed applying HTML/Javascript (GitHub backlink). He also experienced a web site where you could generate the addresses client side, but it seems to be down now. Dismisses the shown items completely if you are logged in. If You aren't logged in, it i

This enables builders to make marketplaces, keep registries of debts or promises, go funds in accordance with Guidance presented long in past times (like a will or simply a futures agreement) and all kinds of other things that haven't been invented still, all with out a middleman or counterparty

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