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2025-05-26: Open Source Software: Digital Freedom

Open source software is no longer a niche topic โ€“ it forms the backbone of our digital world. Many people are unaware of this, but the majority of computers around the globe already rely on open source technologies. In particular, the internet runs heavily on open source: most web servers operate using the Linux operating system, and countless services and applications โ€“ from web browsers to content management systems โ€“ are built on open source foundations.

๐Ÿ” What Does Open Source Mean?

Open source means that a softwareโ€™s source code is publicly accessible, modifiable, and free to use. This transparency not only fosters trust but also enables global, collaborative development. Control does not rest with a single company or state โ€“ it lies with the community. This prevents users from being locked into expensive subscription models or becoming dependent on individual vendors โ€“ a scenario that’s increasingly common with proprietary software.

This issue is strikingly portrayed in the latest season of the series Black Mirror (Season 7, Episode 1): A woman receives a medical chip implant after having a brain tumor removed. The twist? The chip is permanently connected to the providerโ€™s cloud โ€“ all data and functionality are processed externally, with nothing stored locally. Without an active subscription, the chip stops working. The software operates on a tiered licensing model with steadily rising costs. Eventually, the womanโ€™s family can no longer afford the increasingly expensive subscription levels โ€“ leading to catastrophic consequences.

This dystopian scenario highlights how dangerous it can be when essential technologies are fully controlled by a central provider. It creates a total dependency โ€“ both technically and financially. Open source offers a radical alternative: transparent, decentralized, user-controlled, and free.

๐Ÿงฉ Freedom Through Technology

Open source is an expression of digital self-determination. Those who use free software decide for themselves what runs on their devices, what data is shared, and which functions are enabled. This independence is more than just a technical detail โ€“ it’s a political statement in an age of digital surveillance, data exploitation, and monopolization.

A particularly powerful example of open source as a vehicle for independence is Bitcoin. Here too, the entire source code is publicly available, every transaction is verifiable, and the system itself is not centrally controlled. The idea of freedom, transparency, and decentralization is central โ€“ and would not be possible without open source.

๐Ÿ” Security Through Encryption

In an age of widespread digital surveillance, protecting private communication is essential. Open source plays a crucial role here: only with publicly accessible source code can users verify whether a tool is truly secure. Encryption tools such as PGP for email or decentralized messengers like Matrix (with clients like Element) are vital for maintaining privacy and shielding digital conversations from prying eyes.

๐Ÿค A Call to Support Open Source

The benefits of open source are overwhelming: transparency, security, independence, and innovation. But none of this happens automatically. The development and maintenance of free software is often done voluntarily or underfunded. Thatโ€™s why itโ€™s essential that we not only use open source but actively support it โ€“ by contributing to development, reporting bugs, or donating to projects that benefit us all.

Here is a short list of the most famous open source programs:

1. LibreOffice
Free and powerful office suite โ€“ alternative to Microsoft Office
๐Ÿ”— https://www.libreoffice.org/

2. GIMP
Free image editor โ€“ comparable to Adobe Photoshop
๐Ÿ”— https://www.gimp.org/

3. Mozilla Firefox
Secure and fast open-source web browser
๐Ÿ”— https://www.mozilla.org/firefox/

4. Thunderbird
Email client with calendar and chat support
๐Ÿ”— https://www.thunderbird.net/

5. VLC Media Player
Versatile media player that supports nearly all formats
๐Ÿ”— https://www.videolan.org/vlc/

6. Audacity
Audio recording and editing software
๐Ÿ”— https://www.audacityteam.org/

7. Krita
Professional painting and illustration tool for artists
๐Ÿ”— https://krita.org/

8. Inkscape
Vector graphics editor โ€“ similar to Adobe Illustrator
๐Ÿ”— https://inkscape.org/

9. KeePassXC
Secure and cross-platform password manager
๐Ÿ”— https://keepassxc.org/

10. Shotcut
Free, open-source video editor with wide format support
๐Ÿ”— https://shotcut.org/

โœ… Conclusion

In the digital age, open source is not a luxury โ€“ itโ€™s a necessity. There is hardly a more powerful tool for freedom, self-determination, and privacy protection. Those who want a free society must also support free software. Itโ€™s up to all of us to promote open source โ€“ for a digital world that liberates, not controls.

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Blog Bitcoin

2025-04-06: Bitcoin Node with Umbrel

Running your own Bitcoin node is a crucial step toward true financial sovereignty. You verify transactions yourself, protect your privacy, and become an active part of the decentralized networkโ€”without relying on third parties. Whether for security, independence, or learning purposes, your own node brings you closer to the heart of Bitcoin.

๐Ÿ” Full Control

You verify transactions yourselfโ€”no reliance on third parties.
No censorship: send and receive Bitcoin directly through your own node.

๐Ÿ›ก๏ธ More Privacy

Your wallet communicates only with your nodeโ€”no data leaks.
No need for external block explorers.

โšก Lightning Integration

Run your own Lightning channels and wallets directly via Umbrel.
Fast, low-cost payments without middlemen.

๐Ÿ“š Learn & Understand

Gain a deeper understanding of Bitcoin and the network.
Perfect for the curious, tech enthusiasts, and developers.

๐Ÿงฉ Apps & Extensions

Umbrel offers a variety of useful apps: Electrum Server, Mempool, Nextcloud, and more.
All easily installable via a simple web interface.

๐Ÿ  Easy Start

Intuitive user interface, ideal for Raspberry Pi & more.
Quick setup with regular updates. Alternatively, can be virtualized with Proxmox.

๐Ÿงฐ Hardware Checklist for Your Umbrel Node

๐Ÿ”น Raspberry Pi 5
๐Ÿ”น 1 TB SSD
๐Ÿ”น SSD enclosure or adapter (USB 3.0 to SATA)
๐Ÿ”น microSD card (at least 32 GB, e.g., SanDisk Ultra)
๐Ÿ”น USB-C power supply (original power adapter recommended)
๐Ÿ”น Case for the Pi (with cooling)
๐Ÿ”น Ethernet cable (for a stable connection)

Optional:

๐Ÿ”Œ UPS (Uninterruptible Power Supply) โ€“ protects against power outages
๐ŸŒ Router port forwarding โ€“ for a publicly reachable Lightning node or alternatively: via the Tor network

As an IT service provider, Iโ€™m happy to offer guidance and support.

https://github.com/getumbrel/umbrel

Categories
Blog Bitcoin

2025-02-28: UmbrelOS 1.4 released

The popular Umbrel OS, which is also THE software for many Bitcoin nodes, has been updated to version 1.4. The update can be installed immediately.

Attention: The IPv6 network address changes with the update, so that any port releases via the FritzBox must be adapted to the new address. Only then will Umbrel be accessible from outside again.

UmbrelOS 1.4 brings some new features for the personal โ€œhome serverโ€:

  • Create, upload and organize files and documents.
  • Share folders over your local network and easily add them as network drives on macOS, Windows, iOS or Android.
  • Set up a shared folder as a Time Machine backup location on macOS.
  • Preview all your photos, videos, PDFs and audio files.
  • Access to app data folders.
  • Support for external (USB) storage for Umbrel Home users.
Categories
Blog Bitcoin

2025-02-22: Security update for the Bitcoin Lightning Node (LND 0.18.5 beta)

Regardless of whether you use UmbrelOS or Start9OS for your own Bitcoin Node. Currently, I strongly recommend that you install the update to LND 0.18.5 beta, as a security vulnerability has been fixed here.

With Bitcoin, you as a company can accept payments in Bitcoin/Lightning independently of banks and credit card companies. Free of charge and in a matter of seconds.

I would be happy to help you develop a Bitcoin strategy for your company so that you are securely positioned for the future. I can also provide technical support and regularly install updates.