> ## Documentation Index
> Fetch the complete documentation index at: https://docs.phylax.systems/llms.txt
> Use this file to discover all available pages before exploring further.

# Interface Overview

> High-level interface boundaries between Credible Layer components

This page summarizes the public interface boundaries between Credible Layer components.
It is intentionally high-level and does not expose internal endpoints or configuration details.

## Interface Map

```mermaid theme={null}
---
title: Public Interface Boundaries
---
flowchart LR
  CLI[pcl CLI] <--> DappAPI[Platform API]
  DappUI[Platform UI] <--> Contracts[Credible Layer Contracts]
  DappUI <--> Indexer[Transparency Indexer]
  Enforcer[Assertion Enforcer] <--> Builder[Block Builder]
  Enforcer <--> Registry["Registry Data<br/>(On-Chain Events)"]
  Enforcer <--> DA[Assertion DA]
```

## What Changes Require Coordination

| Interface                | Depends On                          | Coordinate With                  |
| ------------------------ | ----------------------------------- | -------------------------------- |
| CLI ↔ Platform API       | Assertion submission and auth flows | Platform + CLI maintainers       |
| Platform UI ↔ Contracts  | Contract ABI + events               | Platform + contracts maintainers |
| Platform UI ↔ Indexer    | GraphQL schema                      | Platform + indexer maintainers   |
| Enforcer ↔ Block Builder | Transaction validation hook         | Network integrators              |
| Enforcer ↔ Registry      | Registry events + schema            | Network + contracts maintainers  |
| Enforcer ↔ Assertion DA  | Bytecode storage API                | DA + enforcer maintainers        |

## Product and Protocol Boundaries

The Credible Layer combines protocol components with Phylax-operated product surfaces. This boundary matters when evaluating trust, availability, and operational ownership.

| Component                | Purpose                                                                              | Layer                                  |
| ------------------------ | ------------------------------------------------------------------------------------ | -------------------------------------- |
| Credible Layer contracts | On-chain registry, protocol admin authority, assertion windows, and timelocks        | Core protocol                          |
| Assertion Enforcer       | Executes active assertions and returns inclusion decisions during block production   | Network enforcement                    |
| Assertion DA             | Stores assertion bytecode and source code for enforcers and public verification      | Phylax-operated storage today          |
| `pcl` CLI                | Builds, tests, authenticates, and submits assertion releases                         | Local developer tooling                |
| Backtesting              | Replays assertions against historical transactions before promotion                  | Phylax-operated development service    |
| Staging                  | Runs assertions against live network activity without dropping transactions          | Phylax-operated validation environment |
| Platform                 | Manages releases, incidents, audit logs, collaborators, alerts, and project metadata | Phylax product                         |

## Guidance

* Keep interface changes backward compatible when possible
* If a breaking change is needed, update all dependent components in the same release window
* Ensure public docs reflect any new interface expectations

## Related Docs

* [Architecture Overview](/credible/architecture-overview)
* [Trust Model & Guarantees](/credible/trust-model)
* [How to Plan a Platform Integration](/credible/dapp-integration)
* [Network Integration Overview](/credible/network-integration)