Overview
Blocktrust is a toolkit for digital identity on Cardano. It lets people prove things about themselves online — that they hold a certificate, passed a course, work for a company, or just control a particular account — without handing over a password or relying on a single platform to vouch for them1. The project bundles a browser extension wallet, a secure messaging relay, a credential creation tool, and the software that anchors these identities on Cardano, all built by a small team at codedata solutions in Münster, Germany.
The stack sits on top of Atala PRISM, the identity platform originally created by IOG and contributed to the Linux Foundation as Hyperledger Identus in 202423. Blocktrust's niche is to provide a .NET implementation of this stack and to ship ready-to-use products on top of it, so that identity wallets and credential flows become accessible without building the infrastructure from scratch.
Key Features
- Browser-based identity wallet. A Chromium extension for Chrome, Edge, and Brave that lets a person create identifiers on Cardano, hold credentials, and sign in to supporting websites with a cryptographic key instead of a password4.
- DIDComm v2 mediator. An open-source messaging relay, written in C# and .NET, that shuttles credentials and encrypted messages between wallets — think of it as a private post office for identity data5.
- Open PRISM node. OpenPrismNode is a community-run alternative to IOG's reference node. It reads and writes PRISM operations on Cardano and exposes a REST and gRPC API compatible with the Hyperledger Identus cloud agent6.
- Credential builder and web-embed toolkit. A browser app for issuing credentials without touching raw APIs, plus a separate tool that embeds credentials into any web page so third parties can verify them with a click1.
- No-code workflow platform. An upcoming if-this-then-that designer for credential issuance and verification, deployed as a Docker image so organizations can run it on their own servers7.
What to Expect
Visitors to blocktrust.dev land on a product catalog rather than a single app. The homepage lists the identity wallet, analytics platform, mediator, credential badges, credential builder, and workflow platform, each with its own subsite and documentation. People curious about what digital identity on Cardano looks like can install the browser wallet and explore hosted demos; organizations evaluating the stack can read technical documentation at identitywallet.blocktrust.dev and try the public API of the hosted mainnet PRISM node6. Developers can fork the C# and .NET source on Björn Sandmann's GitHub, which also hosts the mediator and the workflow platform repositories.
Community channels are small. The project runs a Discord server and a YouTube channel rather than a branded social media presence, and the lead developer doubles as a registered Cardano governance delegate — a detail that reflects how closely the project is tied to the broader Cardano ecosystem. Independent security review not identified, and several products are still described by the team as proof-of-concept transitioning toward production, so evaluators should treat Blocktrust as a maturing, well-scoped open-source project rather than a finished consumer product8.
