Introducing SDF: A New Standard for Machine-Readable Business Documents
Today we're publishing the first public release of the Smart Document Format specification and reference implementation. Here's why we built it and what it means for enterprise document workflows.
SDF vs ZUGFeRD: Why JSON Wins for Enterprise Document Exchange
ZUGFeRD and XRechnung embed XML into PDFs. SDF bundles JSON. The difference isn't just syntax — it's a fundamentally different philosophy about interoperability, tooling, and developer experience.
The SDF Security Model: Signatures, Hashes, and Offline Verification
A look at how SDF handles digital signatures with ECDSA-P256 and RSA-2048, why we chose Web Crypto API, and how consumers can verify a document 20 years from now with no network connection.
Building SDF Server: Fastify, BullMQ, and Multi-Tenant Architecture
A walk through the architecture of sdf-server-core: how we handle multi-tenancy, async validation queues, S3 storage without the AWS SDK, and per-tenant rate limiting.