# EXOCHAIN documentation.

Concepts, schemas, APIs, and operational guides. APIs marked _Unstable_ are subject to breaking change without notice.

### Getting Started

Install the SDK, register an actor, issue your first AVC, and emit a trust receipt.

### Concepts

Identity, authority, volition, consent, execution, custody. The core mental model.

### AVC

Schema, validation rules, delegation, expiry, revocation, signature algorithms.

### Trust Receipts

Receipt anatomy, hash chaining, outcomes, custody hash, signature verification.

### Settlement

Quotes, receipts, ZeroFeeReason, launch policy, future governance pathways.

### Node API

REST and GraphQL surfaces exposed by exo-gateway and exo-node.

### Validator Guide

Hardware expectations, attestation, key management, observation period.

### Security Model

Threat model summary, cryptographic primitives, post-quantum readiness.

### Governance Model

Constitutional invariants, proposal lifecycle, quorum, ratification.

### Glossary

Vocabulary used consistently across docs, SDK, and the protocol.

### FAQ

Frequent questions. If yours is missing, the contact form takes 30 seconds.