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At the very core of ToIP is the ToIP stack—a four-layer model for interoperable decentralized digital trust infrastructure. Below is a static picture of this stack, but the best way to learn about this stack is via this interactive model on the ToIP website.

Evolution of the ToIP Stack

As work on the ToIP stack progressed, in November 2022 the Foundation published a new document called Evolution of the ToIP Stack to provide an overview of the four stages that development is progressing through. We highly recommend this document to put the work of the ToIP Foundation into context.

Design Principles for the ToIP Stack

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The diagram below is a visual depiction of the evolution of the original founding documents into the second generation of foundational documents now being published by the ToIP Foundation (sometimes referred to as the "core four")the ToIP Foundation.