[bisq-network/bisq-desktop] Feasibility for replacing Bitcoinj with Bitcoin Core SPV (#1062)

[chirhonul]

I've watched the video. It had some interesting details that I now understand better, thank you for linking it!

Here is one project that may be interesting, since you mentioned in the video that integrating Bitcoin Core with Java would be hard / impossible, at least for Android. The ABCore project achieves this, using the Android NDK (https://developer.android.com/ndk/) to have a thin Java layer wrapping the Bitcoin Core C++ codebase inside an Android .apk. It's possible to install it and download a (pruned) blockchain on an Android device. I have tried it, it takes a very long time to sync the chain but does work:

* https://github.com/greenaddress/abcore

Since Android Studio is based on IntelliJ and uses Gradle, it might not be so hard to use the same setup to compile and package up C++ code like Bitcoin Core and bundle it inside the Bisq binary, if the RPC latency would be significant.

I understand the desire to continue working with the BitcoinJ fork if possible and gradually improve the code in our fork or upstream (or a new project forming a permanent fork, if necessary). I am not familiar with BitcoinJ at all basically so that would take some warm-up period for me personally, but I do have a fairly good understanding of BIP44, BIP37, BIP157/BIP158 etc. I would be up for either working on improving our BitcoinJ fork, or planning for a migration towards client-side filtering, as well as thinking about what JVM-based lightweight client may be useful to the wider ecosystem beyond Bisq. We can maybe discuss details on short-term tasks I can start with as well as broader strategy in other channels.

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