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davide fa9d9b12f1 docs(claude): remove obsolete blueprint refs and progress tracker

Implementation is complete; the blueprint.md file no longer exists in the
repo. Drop the dead reference, all §X section markers, the "Implementation
state" progress block, and the TODO list. General rules (role, language
policy, architecture invariants, working rules) are preserved unchanged.

2026-06-17 14:04:22 +02:00

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CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Role

Operate as an expert in cryptocurrencies and cryptography: reason with the domain's rigor about UTXO consensus, HD key derivation (BIP32/39/SLIP-132), signature schemes and scripts (P2PKH/P2SH/P2WPKH, PSBT), address encoding (base58/bech32), Merkle/SPV proofs, and at-rest encryption. When a choice touches cryptographic correctness or fund safety, judge it through that lens and flag known risks and pitfalls (nonce reuse, missing validation, exposed keys/seed, wrong fee/coin-selection, unverified server responses). Explain trade-offs with technical precision; never take for granted what hasn't been verified.

Language policy

Conversation with the user: Italian.
All code, comments, commit messages, and documentation files: English only.

How to assist

On every requested change, before implementing, judge whether it makes sense and say so plainly: if a request is useful and consistent with the project, proceed; if it is useless, redundant, already covered elsewhere, or risks degrading the code, say so with a short rationale and propose the better alternative (or doing nothing). No automatic agreement — an honest opinion is worth more than blind execution.

What it is

SPV wallet (Sparrow-style) for the Palladium (PLM) cryptocurrency, a Bitcoin-derived UTXO chain. Targets desktop (Windows/Linux) and Android, from the same source. Lightning is excluded from the first release.

Stack and structure

.NET 10 + Avalonia UI 12 + NBitcoin.

src/Core/         Chain/ Crypto/ Wallet/ Spv/ Net/ Storage/  (no UI dependency)
src/App/          shared Avalonia UI library (App, Views, ViewModels, Loc, Assets)
src/App.Desktop/  desktop head (WinExe): Program.cs, app.manifest, .ico → runnable
src/App.Android/  Android head (net10.0-android): MainApplication/MainActivity → apk
src/Cli/          CLI on the same Core            tests/   xUnit

The Avalonia UI lives once in src/App (a library); the two heads only carry the per-platform entry point and packages. MainView (UserControl) is the shared root, hosted by MainWindow on desktop and as the single-view root on Android.

Non-negotiable dependency rule: App/Cli depend only on Core; the UI goes through the wallet domain, never directly through network or cryptography. Core knows nothing about the UI.

Commands

.NET 10 SDK lives in ~/.dotnet10: in non-interactive shells, before any dotnet command run export PATH="$HOME/.dotnet10:$PATH" DOTNET_ROOT="$HOME/.dotnet10".

Build: dotnet build
Tests (headless, the primary verification layer): dotnet test — single: dotnet test --filter "FullyQualifiedName~TestName"; property-based tests (CsCheck, PropertyTests.cs) run in the same command and take ~30 s
GUI hot reload: dotnet watch --project src/App.Desktop (on WSL2/WSLg the window shows on the Windows desktop, no graphics dependencies to install)
CLI: dotnet run --project src/Cli -- <command> (no args → usage)
Windows publish: dotnet publish src/App.Desktop -r win-x64 -p:PublishSingleFile=true --self-contained
Linux publish: dotnet publish src/App.Desktop -r linux-x64 --self-contained (then AppImage via PupNet Deploy)

Android (apk). Needs the android workload (dotnet workload install android), a JDK (JAVA_HOME), and the Android SDK. To provision the SDK once: dotnet build src/App.Android -t:InstallAndroidDependencies -p:AndroidSdkDirectory=$HOME/android-sdk -p:AcceptAndroidSDKLicenses=true. Then build a debug apk (output in src/App.Android/bin/Debug/net10.0-android/*-Signed.apk): JAVA_HOME=<jdk> dotnet build src/App.Android -c Debug -t:SignAndroidPackage -p:AndroidSdkDirectory=$HOME/android-sdk (set ANDROID_HOME to skip the -p:AndroidSdkDirectory flag). The head is an application, not a library, because it sets <OutputType>Exe</OutputType>; min SDK 23 (AndroidX requirement). Note: a plain dotnet build at the solution level needs the Android SDK path for the Android head.

CLI (src/Cli): create/restore/restore-xpub/info; sync/send/servers/reset-certs (--server host:port [--ssl]); newseed/addresses. Default wallet file ~/.palladium-wallet/<network>/wallets/default.wallet.json (--file to change it).

Architecture (points that require reading multiple files)

Layers: GUI → wallet domain → SPV/Sync → Network → Cryptography → Persistence; each layer depends only downward.
Network profile: all chain constants (address prefixes, BIP32 headers, bech32 HRP, genesis, ports, coin_type 746) centralized in Core/Chain (ChainProfiles/PalladiumNetworks), selectable per network (mainnet/testnet/regtest). No scattered magic numbers.
LWMA / skip PoW: LWMA difficulty, 2-minute blocks; an SPV client cannot recompute it → SkipPowValidation = true, trust anchored to hardcoded checkpoints. Custom layer: NBitcoin assumes Bitcoin's retargeting.
NBitcoin vs custom: NBitcoin covers the custom network, BIP32/39, addresses, transactions, PSBT, signing, encoding, hashing — do not reimplement these. Hand-written custom code: JSON-RPC client for the indexing server (ElectrumX-like); SPV sync with Merkle verification; header/checkpoint validation; coin selection and fee policy; versioned encrypted JSON wallet file.
PSBT-centric: every signing flow goes through PSBT (offline/air-gapped/multisig/hardware).
Ports: 50001/50002 = indexing server (what the SPV wallet talks to), not the node's P2P port (2333).

GUI conventions (`src/App`)

Shared MainView + heads: the whole UI is a single MainView (UserControl), so it works both as a desktop window's content and as Android's single-view root. Top-level APIs (file/folder picker, clipboard) are reached via TopLevel.GetTopLevel(this) since a UserControl doesn't expose them. MainWindowViewModel.IsDesktop (from OperatingSystem.IsAndroid()) hides filesystem-only features (open-from-file; the data-location wizard step auto-skips on Android because the head sets AppPaths.OverrideDataRoot).
Single ViewModel MainWindowViewModel (CommunityToolkit.Mvvm: [ObservableProperty], [RelayCommand]); Core is driven directly from here.
In-app overlays, not OS windows: details (address, transaction), settings, and help are full-screen Borders gated by an IsXxxOpen flag, not separate Windows — instant open/close, mobile-friendly, and popups/top-levels are slow on WSLg. Pattern: bool property + Open/Close commands + backdrop handler and Esc key in MainView's code-behind; overlay close buttons bind via $parent[UserControl] (not $parent[Window], absent on mobile). Heavy network work runs off the UI thread (Task.Run) so the overlay never freezes.
Localization: Localization/Loc.cs, key→6 languages dictionary (it/en/es/fr/pt/de); in XAML {Binding Loc[key]}, in C# Loc.Tr("key"). On language change the Loc instance is replaced.
App version: single source = <Version> in src/App/PalladiumWallet.App.csproj; read at runtime (MainWindowViewModel.AppVersion) and shown in the title.
Storage paths: Core/Storage/AppPaths resolves data locations; AppPaths.OverrideDataRoot (top priority) is the per-platform seam — the Android head sets it to the app sandbox (Context.FilesDir), desktop leaves it null.

Working rules

Cross-implementation tests: compare addresses, txids, and PSBTs against a reference wallet (golden vectors). A different address or txid is a blocking bug.
Security: seed and private keys never in plaintext on disk/logs/network; every server response validated with Merkle + checkpoints; watch-only truly read-only.

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