How the substrate is built.
Production architecture, defensibility analysis, dependency graph, event-sourced backend, cryptographic integrity, public changelog, roadmap. For diligence teams, engineering hires, and acquirers who want the technical truth before they ask.
Architecture
Next.js 15 App Router on Vercel (EU / Frankfurt region). Supabase Postgres with Row-Level Security. Vercel Blob for static assets. 80+ public API endpoints under /api/v1/*. 56 scheduled crons via Vercel cron. TypeScript strict mode throughout, no any types. Schema.org JSON-LD on every public surface. OpenAPI 3.1 spec. MCP server for AI distribution. Ed25519 credential signing.
Defensibility — diligence dossier
Five-pillar M&A due-diligence dossier: bus factor + co-founder substitution, provenance + immutable history, reproducibility + open methodology, methodology + reference literature, legal posture + IP. Each pillar references the actual infrastructure that proves the claim. Designed to be read in 15 minutes by a CoStar / MSCI corp-dev analyst.
Read the full dossier →Causal graph — typed in-code DAG
20-node typed dependency graph spanning macro indicators, regulations, methodologies, regions, products. 19 declared edges with signed coefficients and lag-day estimates. When Euribor moves 25bp, the graph traces which products reprice within seven days versus which take six months. Visualised as a force-directed SVG with edge weights.
Explore the graph →Event sourcing — append-only log
Every state change in Avena writes an immutable event to the events table before its projection updates. Replay the system at any historical timestamp via the as_of parameter. Critical for institutional diligence and methodology backtest.
Replay the system →Integrity — SHA-256 + daily Merkle root + Zenodo
Every methodology version, model snapshot, dataset batch, and event log segment fingerprinted with SHA-256. Daily Merkle root rolled across all fingerprints and deposited to Zenodo for RFC 3161 trusted timestamping. Same cryptographic guarantee as Ethereum L2 commits with zero blockchain ceremony.
Verify an artefact →Changelog — public, dated, signed
Every shipped change recorded with date, scope, and methodology impact. Major architectural commitments tagged. Methodology version revisions linked. Reproducible from the event store back to platform launch.
Read the changelog →Roadmap — what's next
Six-month engineering roadmap. Federated learning protocol (banks contribute model deltas without sharing books), synthetic property generation, AVN-ID v2 with extended credential types, Property Reality Layer protocol adoption, Homomorphic Risk Twin substrate. Each item linked to its strategic-execution-brief origin.
View the roadmap →GitHub repository public at github.com/HenrikKolstad/avena-terminal. CC BY 4.0 licensed. DOI 10.5281/zenodo.19520064. Wikidata Q139165733. RICS Tech Partner. EU data residency (Frankfurt). Methodology audit at /methodology.