Add bitcoin-{node,gui} to release binaries for IPC

[Sjors]

Have depends make libmultiprocess by default. This PR causes the following behavior changes:

1. bitcoin-node and bitcoin-gui binaries are included in releases, due to ENABLE_IPC option being switched on by default in depends builds
2. ENABLE_IPC is also switched on by default in non-depends builds (instructions updated, build: Enable ENABLE_IPC option by default #33190 does this as a standalone PR)
3. Various changes to CI: switching on ENABLE_IPC on in most configurations and using bitcoin-node binary (bitcoin -m) for functional tests in two of them.
4. The bitcoin-node and bitcoin-gui are added to Maintenance.cmake (since they're now in the release)

This PR doesn't need to do all of these things at once. However it's is simpler, avoids code churn (especially in CI), and probably less confusing to make all these changes in the same PR.

Windows is not supported yet, so ENABLE_IPC is off by default for it. It can be enabled after #32387.

The initial main use case for IPC is to enable experimental support for the Mining IPC interface. A working example of a Stratum v2 Template Provider client using this interface can be found here: Sjors#48.

See #31756 for discussion of when this should happen. Supersedes #30975.

Wait what, why?

The Stratum v2 spec has been around for a few years now, mostly stable but with ongoing activity to clarify and fix more subtle issues encountered by implementers. Most of the implementation is built in Rust in a project called the Stratum Reference Implementation (SRI).

Braiins added Stratum v2 support to both their (custom) firmware and pool several years ago, though they have fallen behind on recent spec changes (update: it seems they've fixed that). Apparently new hardware is underway that supports Stratum v2 without the need for custom firmware.

DMND pool is Stratum v2 native from the start and employs several of the SRI developers (they haven't fully launched though). The industry is rather secretive, but apparently there is more underway.

What does Bitcoin Core have to do with this? Well, in Stratum v2 jargon we are the Template Provider.

Or at least, the Template Provider role needs us to make block templates. Initially back in 2023 the plan was to have Bitcoin Core implement this role entirely, see #23049. It would speak the sv2 encrypted message protocol. In fact the spec was designed around this assumption, making sure to only use cryptographic primitives already in our codebase.

I took over that effort in late 2023, but during 2024 it became quite clear there was strong resistance to the idea of including all this new code, opening another network ports, etc.

At the same time there was the long running multiprocess / IPC project #10102, and the idea was born to apply that here: instead of including Stratum v2 specific stuff, we offer a general Mining interface via an IPC connection that can e.g. push out fresh block templates as fees rise above a threshold (something not possible and/or very inefficient with getblocktemplate). A client sidecar application then sits between the Stratum v2 world and our node.

Currently there's only one such sidecar application, maintained by me, and reusing the same codebase from the integrated approach. An attempt has been made to connect to our interface from Rust bitcoin-core/libmultiprocess#174, which would pave the way for SRI include the Template Provider role. Plebhash below indicates he's also working on that: #31802 (comment).

So with this new approach in mind, between mid 2024 until spring 2025, I introduced a new Mining interface (#30200 - #31785). At the same time Russ Ryanosky worked on more tight integration of libmultiprocess, including making it a subtree in #31741. See design/multiprocess.md.

Meanwhile I've been maintaining a fork of Bitcoin Core that includes the Template Provider, in the original integrated approach (Sjors#68) as well as an IPC + sidecar variant (Sjors#48). I've been shipping regular releases, mostly after bug fixes or major rebases. The SRI team has been testing both variants, though the "official" instruction on their web page is to stick to integrated version. Bug reports on my repo fork as well as on the SRI repo are evidence of actual testing happening.

But as Pavlenex writes below:

one recurring feedback I kept getting regardless of the size/type of miner is that the need to run a forked version of Bitcoin Core remains a significant barrier to adoption

This PR gets rids of that significant barrier. People can download a "pristine" version of Bitcoin Core and the only change is to start it with bitcoin node -m -ipcconnect=unix instead of the usual bitcoind.

Once that's released, I can dramatically simplify my sidecar codebase (Sjors#48) by removing pretty much all Bitcoin Core code that it doesn't need. My plan is to then make that a separate repository, which should be much easier to contribute to. I can then also make (deterministically built) signed releases, while making it clear that sidecar code has nothing to do with Bitcoin Core. Perhaps later on SRI implements the same and I can stop maintaining that project.

Conceptually the situation will be a lot clearer;

• today: download forked version of bitcoind (or a forked version of bitcoin-node, plus bitcoin-mine), install SRI stuff
• tomorrow: download Bitcoin Core v30, install bitcoin-mine and SRI
• future: download Bitcoin Core v30 and SRI

Guix hashes:

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Code Coverage & Benchmarks

For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/31802.

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Conflicts

Reviewers, this pull request conflicts with the following ones:

• #33201 (Add functional test for IPC interface by sipa)
• #32989 (ci: Migrate CI to hosted Cirrus Runners by willcl-ark)
• #32162 (depends: Switch from multilib to platform-specific toolchains by hebasto)

If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

[sipa]

Some chatter from IRC:

17:21:41 < darosior> It might be confusing to release both a bitcoin-wallet utility and a bitcoin-wallet binary as part of multiprocess?
17:24:08 < darosior> We could rename the utility, but then it would be nice to at least have one deprecation cycle. Given recent momentum i estimate it's possible we might release multiprocess in 
                     30.0, which means if we want to deprecate the bitcoin-wallet utility name we should do it.. now?
17:33:31 < sipa> bitcoin-wallet-util ?
...
23:38:57 < _aj_> darosior: bitcoin-wallet-process, bitcoin-gui-process, etc? it's multi *-process!
03:04:34 < Sjors[m]> darosior: at the moment there is no wallet binary if were to enable multiprocess. That won't happen until #19460.
...
03:05:18 < Sjors[m]> Or maybe already in #10102
...
03:05:50 < Sjors[m]> In any case #31802 only adds bitcoin-node and bitcoin-gui.
...
03:07:19 < Sjors[m]> Though if we want to rename the utility eventually, it's always better to do it early.

[Sjors]

@sipa I opened #31827

[Sjors]

The sidecar Template Provider application now has its own repo: https://github.com/Sjors/sv2-tp (release coming soon)

I suspect that the SRI team will have a Rust alternative soon(tm) as well.