Layer 4: Trust Applications — First Person Trust Stack

What is the Trust Applications Layer?

Layer 4 is where the trust stack meets end users. It is the application layer — the UI/UX components, developer tools, and end-user interfaces that make the trust stack accessible to people who are not cryptographers or protocol engineers.

The goal of Layer 4 is to make it as easy to create a Verified Trust Agent, join a Verified Trust Community, and manage your trust relationships as it is to create a social media account today — but with the privacy, sovereignty, and cryptographic guarantees that social media platforms cannot provide.

Layer 4 applications are built on top of Layers 1–3. They use the DID infrastructure (Layer 1), the TSP messaging channel (Layer 2), and the credential/governance framework (Layer 3) to deliver trust-aware features to end users.

Applications at Layer 4

The following applications model how Layer 4 trust applications can be built. The Agent App and Utility Server exist today as development and infrastructure components rather than standalone products — they show how PNM and CNM functionality maps to the trust stack. Developer tooling is planned for future release.

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Personal Network Manager

The Agent App models how a Personal Network Manager can be built. It provides TUI and web dashboard interfaces for creating VTAs, managing relationships, exchanging VRCs, and participating in trust communities. Rather than being released as a standalone product, it serves as a reference for developers building their own PNM-style applications on top of the trust stack.

Modeled in Agent App

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Community Network Manager

The Utility Server covers Community Network Manager functionality: name registry, credential registry, witness attestation, and VTC governance primitives. Like the Agent App, it is not being released as a standalone product — it demonstrates how CNM-style services can be built on the trust stack and provides the infrastructure needed to bootstrap the first Verified Trust Network.

Covered by Utility Server

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Developer Tooling

SDKs, APIs, and developer tools for building trust-aware applications on top of the FPTS stack. This includes:

TypeScript/JavaScript SDK for Layer 2 (TSP) integration
REST API for VTA/VTC/VRC management
Webhook support for trust event notifications
Testing and simulation tools for trust graph scenarios
Documentation and example applications

Planned

The Vision

The ultimate goal of Layer 4 is to make the trust stack invisible to end users — in the same way that TLS makes encrypted web connections invisible to people browsing the web. Users should not need to understand cryptography, DIDs, or VRCs to benefit from the trust stack. They should simply experience a more trustworthy internet.

Concretely, this means:

For individuals: a personal identity that you own and control, relationships that are cryptographically provable, and the ability to delegate authority to AI agents with confidence that they cannot exceed their mandate.
For communities: governance tools that are transparent, tamper-proof, and resistant to capture by bad actors — whether those actors are humans or AI systems.
For developers: a simple, well-documented API for adding trust-aware features to any application — without needing to implement cryptography or protocol engineering from scratch.
For AI agents: a verifiable identity and a cryptographic record of their authority — so that AI agents can act on behalf of humans with accountability and auditability.

Layer 4 development has not started. Developer testbed interfaces (TUI dashboard and web dashboard) exist in the agent-app for testing Layers 1–3, but these are development tools, not the end-user applications envisioned for Layer 4. Production-grade Layer 4 applications depend on Layers 1–3 being sufficiently complete. If you are interested in contributing to Layer 4 design or development, please reach out via the About page.

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