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Valid, fact-based information about Bitcoin – explained clearly, without market noise. Since 2023, independent and free.

Sebastian Kromer

Sebastian Kromer

Founder & Author, Bitcoin21st · Dipl.-Ing., MSc., MRICS

Sebastian Kromer founded Bitcoin21st.de in 2023 because he felt German-language Bitcoin coverage was missing a source that explains Bitcoin without price hype or sales pressure — accessible, but without glossing over the technical and regulatory substance. Since then he has researched and written about Bitcoin as money, custody, and the regulatory developments around the network, from how the mempool works to the US Strategic Bitcoin Reserve.

By profession, he is a founder and managing director, as well as a capital-raising advisor with a focus on real estate. He brings his analytical background from over ten years in real estate analysis, valuation, and transaction advisory (including at KPMG) into his Bitcoin research: checking sources, contextualizing numbers, and naming risks instead of selling opinion as fact.

Bitcoin Protocol & Technology 85%
Custody & Security 90%
Macroeconomics & Regulation 90%

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We don't sell anything and we don't provide legal advice: Bitcoin21st.de is not investment, tax, or legal advice — it's an efficient source of information on Bitcoin. Every article is backed by sources; we clearly label affiliate links and don't let them bias our assessment — details in our disclaimer and privacy policy. Legally responsible for all content is FinReal21st UG, named in our legal notice.

On Bitcoin21st.de, you will receive valid information on the subject of Bitcoin. All services and information on this site are provided free of charge. However, you can support the initiators and authors by using the affiliate links. The following links are exclusively linked to the original manufacturer's pages. This does not constitute investment advice within the meaning of Section 2 (2) No. 4 of the German Securities Institutions Act (WpIG). Likewise, it does not constitute tax or legal advice.