Jens Ernstberger

Kontext blog post arguing for transitioning agents from static API keys to standards-based, dynamic authorization (OAuth/OIDC) for safer agent identity and delegation in MCP ecosystems.

Article summarizing research and implications for decentralized physical infrastructure networks (DePIN), discussing manipulation and self-dealing challenges and design lessons for DePIN protocol designers.

Formal model for eliciting unverifiable information from sources with implicit signals from observers; establishes conditions (source identifiability) necessary for truthful mechanisms and applies framework to DePIN applications like proving location and bandwidth.

Introduces Zero-Knowledge Location Privacy (ZKLP) and floating-point SNARK circuits compliant with IEEE 754 to enable proving proximity or region-membership without revealing exact coordinates; demonstrates performance and practical protocols for privacy-preserving proximity testing.

Presents ORIGO, a system for proving provenance of sensitive data with constant communication complexity.

Systematization of Knowledge (SoK) analyzing end-to-end security properties and 141 vulnerabilities in SNARK implementations, providing a taxonomy and recommendations for improving SNARK-based systems.

Technical posts on decentralized onboarding, AWS Nitro attestation, elliptic curves and recursive SNARKs, and agent authorization published on the author's personal site.