OW2con'25

NextGraph : Build secure, local-first and decentralized apps
2025-06-18 , February Breakout Room

NextGraph is an open source ecosystem providing solutions for end-users (a platform) and software developers (a framework/SDK), wishing to use or create decentralized apps featuring: live collaboration on rich-text and JSON documents, a sync protocol with end-to-end encryption, local-first based on CRDTs (it works offline too), portable and interoperable data, with high availability.
NextGraph guarantees security, privacy and sovereignty, with total ownership of data and software, and full control over locality: we know where the data is stored, and where the automatic encrypted backups are.


Centered on Documents containing semantic data (RDF), rich text, and structured data formats like JSON, forming a Database synced between peers belonging to permissioned groups of users, NextGraph offers strong eventual consistency, thanks to the use of CRDTs. Documents can be linked together, signed for integrity and authenticity, shared securely, queried using the SPARQL language and organized into sites and containers.

Using our framework, SDK and APIs, developers will be able to create standalone or embedded apps that can make capability-based access requests on the user's data, define smart-contracts and implement any business logic within cross-document ACID transactions. With NextGraph, users and apps can securely access and traverse their authenticated data graph (web of data) and social graph (social network), while enabling resilience, decentralization, and preserving privacy, data integrity, and availability.

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Niko Bonnieure is a software engineer specialized in encryption, local-first and linked data technologies. After working in big data startups for several years, and following the Snowden revelations in 2013, he decided to quit those jobs and dedicate his time to building a decentralized platform for malleable apps based on graph databases. He then added CRDTs to the mix to solve consistency issues in P2P setting, and E2EE to preserve privacy.
Niko is a strong advocate for Digital Sovereignty in Europe.