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Two questions arrived together -- whether Room's own testing guidance applies to this project, and what desktop support would cost -- and they turned out to have opposite answers. Both are now in docs/jvm-target.md, phased, with the blocking work separated from the mechanical work. **The expensive part is already done.** The four-deep native chain -- secp256k1 -> bitcoin-kmp -> lightning-kmp -> lightning-kmp-app -- already builds for JVM, on every android build we do. The comment at composeApp/build.gradle.kts:50 records the mechanism without drawing the conclusion: lightning-kmp-core publishes no android variant, so our android target resolves it to the *jvm* one, which pulls secp256k1-kmp-jni-jvm desktop natives, which is exactly why the build has to name the android artifact by hand. Read the other way round, every JVM artifact in the chain is already compiled from source by the composite build. A jvm target adds no cinterop, no C compilation and no new native constraints. That was the part worth being afraid of, and it is finished. **The blocker is one level down, and smaller than it looks.** lightning-kmp-app/library declares 25 expects and implements them across 35 androidMain files. Its jvmMain holds exactly one: fibiprops.jvm.kt, the Kotlin multiplatform library template's Fibonacci boilerplate, satisfying two of the 25 -- both of them the template's own. So 23 actuals are missing, which is why jvm() is commented out there (library/build.gradle.kts:18), which is why it is commented out here (composeApp/build.gradle.kts:46). Mantra cannot declare the target until the fork does. Six phases, ordered by that dependency. 0 build config; 1 the fourteen mechanical phoenix actuals; 2 the three SQLDelight JDBC drivers and NetworkMonitor; 3 key storage; 4 mantra's own sixteen expects; 5 the desktop entry point. 1-3 are independent and parallelisable, 4 is where the compiler finally checks the whole thing. Roughly a week to a launchable build. **Phase 3 has no day estimate, deliberately.** keyStoreEncryption / keyStoreDecryption and their two graceful* wrappers delegate on android to KeystoreHelper.kt -- 116 lines against AndroidKeyStore, StrongBox attempted first and fallen back from, key material never leaving hardware. Desktop JVM has no equivalent, so this is a decision rather than a port, and the doc gives the three real options against what each actually protects. A fixed-key JCEKS file is named there as a liability rather than a stopgap: this is wallet seed material, and it lands on top of the plaintext-key finding already open against this codebase. Recommended sequencing is a passphrase-derived KEK with the desktop build marked unsuitable for real funds, so phases 4 and 5 can proceed without the security question being quietly treated as answered. Two inherited mistakes are called out rather than carried forward. The old Aux jvmMain put the database in java.io.tmpdir behind a TODO -- the doc says not to inherit that in either phase that touches it. And schedulePlatformLogic goes through WorkManager on android with no desktop counterpart, so the doc asks for an explicit choice between a no-op and an in-process coroutine, written down. **The DAO answer is an appendix, because it is the opposite answer.** None of the above is needed to test the DAOs, and burying that would have been misleading. room3-runtime-android:3.0.1 already exposes the no-Context inMemoryDatabaseBuilder(Function0<T>) overload, and MantraDatabaseConstructor already supplies what it needs, so Room's recommended host-machine form compiles in commonTest and runs under testDebugUnitTest today. The one trap is native and is the secp256k1 problem mirrored: sqlite-bundled-android ships only android-ABI .so under jni/, so a local unit test's JVM cannot load it and BundledSQLiteDriver fails at construction; sqlite-bundled-jvm on the androidUnitTest classpath is the fix. Robolectric neither helps nor is needed -- it cannot load android .so on the host either. Everything structural here was checked against the artifacts rather than recalled: the Room builder overloads by javap on room3-runtime-android, the two sqlite-bundled native layouts by unzipping both, and the availability of room3-runtime-jvm, room3-testing, quartz-jvm and the two SQLDelight drivers by request against the repositories this build actually resolves from. The absence of android.* and java.* imports in commonMain, and of any NFC reference from it, was likewise grepped rather than assumed. **Not verified: anything that requires compiling.** No jvm target was turned on, nothing was built, and the day estimates are estimates. Phase 4 is where dependency-substitution surprises would surface if there are any, and it is precisely the phase nothing here exercises. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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mantra docs
Notes on the parts of this app whose behaviour is not recoverable by reading the code alone — where the reasoning lives in a protocol, a failure mode that is silent, or a decision that looked arbitrary and was not.
| document | covers |
|---|---|
| shared-key-ceremony.md | ChillDKG over NIP-17: the rounds, the approval gates, the chat transcript, participant ordering |
| shared-key-derivation.md | deriving further keys from the group's threshold key with FROST tweaks — why not BIP32, why no chain code, and the one rule that must not be broken |
| marmot-membership.md | how members join an MLS group, and the epoch race that makes a missing member look like a successful invite |
| mls-skipped-keys.md | why a group event that arrives a moment late is dropped for good, which flows trigger it, the quartz fix, and the partial mitigation in this app |
| jvm-target.md | what desktop support would cost, phased — why the native chain is already done, why an empty source set in our phoenix fork is the real blocker, and why DAO tests do not need any of it |
Start with the ceremony if you are new to this area; the other two both assume it. Read the skipped-keys note before debugging any "the other device never got it" report — it is silent, and it looks like every other kind of delivery failure.