stamp.et is Ethiopia's digital notary and organizational e-seal platform: think DocuSign + notary + seal registry, purpose-built for Ethiopian institutions. Verified organizations create cryptographic digital stamps and apply them to documents; anyone can verify a stamped document for free by scanning its QR code. It's part of the LUMEN network.

What It Does

• Organization registry: institutions register, get vetted, and are approved through an admin portal before they can issue anything
• Stamp engine: organizations create digital stamps/seals with a full lifecycle (activate, suspend, revoke, expire) and apply them to documents with cryptographic signatures that make any later tampering instantly detectable
• Public verification: every stamped document carries a QR code and shareable link; the public can verify authenticity for free, with each attempt logged
• Org-to-org document sharing: secure share links and access-request flows between institutions

How It's Built

• Modular monolith organized into six bounded contexts (Organization Registry, Stamp Management, Document Engine, Verification Service, Identity & Access, and Platform Administration) communicating over an internal event bus, with hexagonal architecture inside each module
• NestJS 11 + Fastify backend, Drizzle ORM on PostgreSQL 17, Valkey cache, MinIO (S3-compatible) for document storage
• Zitadel for identity (OIDC + Private-Key-JWT token introspection), with phone-first OTP auth via AfroMessage for Ethiopian numbers
• Government-grade audit logging: every significant action (org approval, stamp issuance, document stamping, verification attempt) is recorded for accountability
• File security: signed URLs, rate limiting, referer checks, and an auth gate protect stored documents
• Fully trilingual (English, Amharic, Oromiffa), monorepo on pnpm + Turborepo, deployed via Docker + Nginx + auto CI/CD

Why It Matters

Ethiopia is mid-transition from wet-ink stamps and physical seals to digital trust, and forged seals are a real problem. stamp.et gives institutions a tamper-evident, cryptographically verifiable way to seal documents, and gives every citizen a free way to check that a document is genuine.