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Sachwert-Tresor

Android
Android
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Sachwert-Tresor is a local, encrypted vault for tracking your Bitcoin, gold and
silver holdings. It runs fully offline — no cloud, no server, no telemetry, no
price lookups over the network. Your data never leaves the device in plaintext.

Features:

  • NO permissions at all — not even INTERNET. The OS itself guarantees the app
    cannot phone home; verify it right in the APK manifest (since v2.0)
  • FLAG_SECURE: no screenshots, no screen recording, no preview in recents (v2.0)
  • AES-256-GCM encryption, key via PBKDF2-SHA256 (600,000 iterations), native WebCrypto
  • Optional 2FA (Aegis / TOTP, RFC 6238) with a self-contained QR encoder
  • Bitcoin: buys, sells and withdrawals; gold and silver by count × denomination
  • Multi-currency entries (EUR / USD / CHF), totals kept separate per currency —
    still zero network lookups (v2.1)
  • Manual current-value calculation — you enter prices yourself, nothing is fetched
  • Encrypted .vault backup, peer-to-peer sync via Syncthing (no cloud)
  • CSV export compatible with the BTC tax tool (KYC / noKYC kept separate)
  • Fully bilingual (German / English), offline in-app manual included
  • Open source (MIT) — no third-party crypto, no external CDNs, no trackers