Background & Biography
CSIR’s institutional profile records a BEng in Chemicals from North-West University in 2012 and an MEng in Management in 2015. It describes an early career in energy engineering and a turn toward distributed-ledger technology in 2016. These qualifications provide an engineering foundation for his later software and research work.
Independent reporting identifies him as a former asset care engineer at Eskom’s Lethabo power station.
The Blockchain Academy’s 2022 advanced-course prospectus identifies de Jager as an instructor and consultant. It credits him with developing and presenting technical and executive courses, including material for financial institutions, insurance businesses and university graduates. This dated record documents an educational role across different levels of technical familiarity.
A later Blockchain Africa Conference biography dates his CSIR research-group leadership from May 2022 to June 2025. His remit concerned distributed ledgers and blockchain. The institutional profile describes an interest in applying open public blockchains to conventional financial systems. That employment belongs to his professional history, rather than being treated as a current role simply because an older page remains online.
In a May 2026 Scaling your Leadership interview, he described the movement from engineering into blockchain and the evolution of his company toward analytics, intelligence and data. Host Dave Betts identifies himself as de Jager’s friend and coach. The conversation is useful as de Jager’s own account of professional development; that relationship limits its value as independent validation of business performance.
Notable Contributions
A specific research contribution is documented in Coinbase’s November 2023 proof-of-reserves grant announcement, coauthored by Shashank Agrawal and de Jager. Coinbase selected Silver Sixpence to develop an open-source cryptographic software library and a supporting dashboard. The stated scope included both assets and liabilities, with attention to verification and privacy. The announcement records selection and intended deliverables, without certifying every subsequent release or an exchange’s financial condition.
The proposed work addresses a practical tension in transparency: users and other interested parties may want to verify an institution’s obligations and holdings without exposing everyone’s private account information. The coauthored announcement discusses zero-knowledge techniques and the different trust assumptions of proof-of-reserves methods. Those are research and implementation questions, rather than a claim that one demonstration can replace every part of a conventional audit.
Sixpence currently describes an infrastructure built around its own archival blockchain nodes and indexers. Its published product account explains how raw on-chain information becomes structured data available through APIs and applications. The company places compliance, tax and audit products on that common foundation. These are the company’s descriptions of its architecture and intended users, not independently measured performance or a finding about any person shown in a demonstration.
His earlier institutional work also addressed how organizations interpret cryptocurrency activity. The South African Fraud Prevention Service’s 2024 summit biography identifies him as the CSIR blockchain research lead and describes his team’s development of cryptocurrency analytics with a focus on countering illicit activity and fraud. It places that research in a professional risk-and-assurance setting without attributing every team result to him individually.
The organizer’s retrospective of the October 2025 Blockchain Africa Conference records his presentation on blockchain forensics and his participation in a Bitcoin-mining panel with Stafford Masie, moderated by Steven Sidley. This connects two identifiable strands of his public work: understanding transaction records and discussing the physical infrastructure behind Bitcoin. The retrospective documents those contributions without establishing the content of an unheard recording.
The January 2026 Adopting Bitcoin Cape Town programme lists him for a privacy panel and a separate talk about blockchain data. His abstract describes the limits of analytics, false positives from common heuristics, avoidable data leakage and the conversion of full-node information into accounting-oriented reports. It is a statement of the talk’s intended scope, rather than evidence that a particular analytical method was independently validated.
Why Katharos.ai Follows Carel de Jager
Katharos.ai follows de Jager because his work links technical education with the operational questions institutions ask about blockchain systems. The Blockchain Academy executive course listing, which names him as lead instructor, includes consensus, security, public and permissioned networks, payments, remittances, identity and audit. Its practical exercises ask participants to develop a use case and discuss technical feasibility. This supports a concrete educational contribution beyond general enthusiasm for the technology.
His company’s current emphasis on data provenance makes the underlying process an appropriate subject for scrutiny. Sixpence describes tracing outputs to blockchain records and combining compliance, tax and audit applications. For readers assessing such tools, useful evidence would include documented data coverage, reproducible processing and clear explanations of limitations. A product description sets out the intended approach; it does not settle those questions by itself.
Areas to Follow
The proposed energy project is an important area to follow with dated evidence. TechCentral reported in April 2026 that Eskom was working with Nersa on a framework for selling surplus daytime electricity to flexible users, including Bitcoin miners. Eskom executive Agnes Mlambo said regulatory steps and public consultation remained necessary before a pilot. The report identifies de Jager as a Bitmach co-founder and does not establish an exclusive or already operating mining arrangement.
A Moneyweb RSG Geldsake programme dated 1 October 2026 subsequently listed de Jager discussing Eskom’s plan to provide surplus power to crypto miners and other flexible consumers. Its public notes identify him as Sixpence chief executive and Bitmach co-founder. Those notes show continued public discussion, not proof that a pilot had begun.
The privacy programme provides another useful line of attention: how analytical conclusions are presented when blockchain evidence is incomplete or a heuristic can misclassify activity. His published abstract explicitly recognizes these limits. The meaningful test is whether explanations and software outputs preserve that uncertainty instead of making a tentative association look like a conclusive identity finding.
Reporting Scope
This profile covers documented professional roles, institutional education records, research announcements, conference contributions, product descriptions and independent reporting. It distinguishes a team’s work from an individual’s authorship and a proposed deliverable from a verified release. It does not include private financial or residential details.
South Africa reflects the professional base identified in his own biography.
The mining proposal is described according to the dated reporting. No operating capacity, exclusive contract or completed regulatory approval is asserted.
Areas of Influence
Exchanges & Infrastructure reflects work on blockchain data and cryptographic assurance. Investment & Founders reflects his documented company leadership. Community, Media & Education reflects technical instruction and public explanation. The common focus is the development and interpretation of tools for people who need to understand digital-asset systems.
Photo attribution: Carel de Jager, “Headshot, formal”. Photograph credited in supplied metadata to KAIMARA PIETER UYS. Original capture metadata: 26 September 2022. Supplied through the official press kit: https://careldejager.com/press-kit/. Source-page notice: © 2026 Carel de Jager; the footer year is not a photograph date. Complete 895×1372 supplied image retained at native size and padded to 2907×1377 (19:9); no cropping, resampling or retouching. No open licence or endorsement implied.
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