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Today, any device is networked, not only our personal devices, but anything from the fridge to the power plant. This implies endless possibilities, but also possibilities galore for anything to go wrong. Decades of thorough theoretical and hands-on experience enables me to guide you toward the right solution for anything networked. Learn more…


Recent technical essays

  • Offline digital cash?

    The question of using digital money in the event of a network outage comes up again and again. Here is an overview of the options and their pros and cons.
  • The NFT Danger Zone

    Susanna Petrin closes her NFT experiment with a dystopia of life after we destroyed our environment: Admiring our NFTs while strolling through the metaverse. I hope we can avert both.
  • A business-driven blockchain evaluation flow chart

    Yesterday, Rene Jan Veldwijk posted a blockchain decision flowchart he had previously used in a presentation.
  • Blockchain in a nutshell

    People often try to claim blockchain use cases without much deliberation. Here is a condensed, quotable version of «Hitchhiker’s Guide to the Blockchain» and «Data lifecycle questions, not only for Blockchains».
  • Web3 is just expensive P2P

    Web3 claims to be the only way to save us from commercial entities defining what we can see and what not. Yet, it does exactly this: It results in commercialized entities defining what we can see and what not.
  • chrony NTS certificate reload

    The chrony NTS daemon has no way to automatically reload its NTS certificate. A quick hack fixes this.
  • Hitchhiker’s Guide to the Blockchain

    Blockchain, cryptocurrencies, smart contracts, Web3 and NFT are the talk of the town. Almost everyone has an opinion, but hardly anyone understands the foundations or relationships. The goal of this series, whose first part you are currently reading, is to provide a structured presentation of promises, the technology behind, and the reality. Using everyday analogies such as space-faring, stamp-throwing, anarchist notaries, the concepts are explained in a trilogy in five parts.
  • Data lifecycle questions, not only for Blockchains

    In any data-centric applications, understanding the data lifecycle (also as part of the product lifecycle) is important, especially when trust or traceability are also goals. If Blockchain should play a role, then the requirements associated with the data lifecycle can even become a decisive factor: Either adapt the data model or the processes, or, if that is impossible, limit Blockchain use to selected areas or entirely abolish it.
  • Solana Blockchain: Proof of History analogies

    Here are some attempts to compare Proof of History (PoH), as used by the Solana blockchain, with Proof of Work (PoW). Comparisons to real-world activities, such as dice rolling or outer-space rubber-stamp throwing are also included.
  • Bitcoin Block Timing Statistics

    Bitcoin wants to be a universal payment means, providing rapid transactions. Here is an analysis on the blockchain timing, based on their timestamps.

All blog posts…