Also need a hardware note signing device. The Blockstream Jade open source hardware should be sufficient. It has a screen and camera and enough programmability to support HD keygen.
There are a couple of hardware signers that exist out there already, but nothing is very mainstream yet.
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To be fair though, nostr is not very mainstream.
The Jade mod is a nice idea because it's secure core, open source, robust, and obtainable through a relatively trustworthy supply chain. Should be able to manage generation of HD key chains without difficulty.
