I build reproducible measurement instruments for complex dependency systems, with their assumptions made explicit. Wiesbaden, Germany.
TrialDiff — deterministic, source-linked Evidence Records for ClinicalTrials.gov protocol-amendment history. Each record is hash-pinned to the patch that produced it, and event-class membership is decided by a published rule-set rather than by judgement. Records assert the structural fact of a change and nothing beyond it: no misconduct, no regulatory finding, no clinical significance. Independent reconstructibility is reported, not assumed — the current release states how many memberships are decidable from the embedded patch alone and how many are not.
Repository | DOI 10.5281/zenodo.20801956 | CC BY 4.0
Contractibility regimes and regulatory architecture. When a novel financial substrate outruns the categories built for prior asset classes, the usual move is analogy — to insurance, securities, commodities, gambling. The alternative is to decompose inherited regimes into primitive protection and hazard mechanisms and recompose the bundle the new substrate actually needs. Event-contract markets are the live specimen, and the CFTC's 2026 rulemaking on prediction markets is the occasion.
A related line asks what institutions can admit, govern, and revoke — externally maintained software artifacts, external state that outlives its support, and claims that keep being priced after the relation producing them has ended.
SSRN 10.2139/ssrn.6797484 | Working paper on Zenodo | Full list on ORCID
Criticality Spectrometer — node criticality is a curve, not a score. Removes each node, sweeps the horizon at which substitutes appear, and records mission loss at every horizon. Runs unchanged across an AI-compute supply chain and a Kubernetes service mesh; the answer moves with the view, not the code. Two bounded domains are a transfer test, not a proof of general applicability, and the repository states its non-claims explicitly. PyPI · DOI 10.5281/zenodo.21383918
Who Holds the State? — a framework for testing claims after their support ends, with a twelve-row launch registry applying it across clinical, financial, and household cases. DOI 10.5281/zenodo.20404428
Trust Percolation Bound — an exact cascade-initiation floor, and the result that in the intermediate contagion regime the phase transition requires persistent local clustering. Archived on Zenodo; not published in a peer-reviewed venue. DOI 10.5281/zenodo.19685771
Rendering as Audit — interactive demonstration of five design principles for embedding verification logic in rendered output. SSRN 10.2139/ssrn.6612663