# How it Works

- [Modularity of the Stack](https://holonym.gitbook.io/holonym-alpha/how-it-works/modularity-of-the-stack.md): Holonym creates modular infrastructure for privacy, flexibility, and security.
- [Issuer](https://holonym.gitbook.io/holonym-alpha/how-it-works/issuer.md)
- [Credentials](https://holonym.gitbook.io/holonym-alpha/how-it-works/credentials.md): Credentials are signed attestations by an issuer. While it supports legacy credential types, Human  ID has a standard format for such credentials designed for simplicity and efficiency in a ZKP.
- [Hub](https://holonym.gitbook.io/holonym-alpha/how-it-works/hub.md): The contract where everything happenson-chain