> For the complete documentation index, see [llms.txt](https://docs.jazdid.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.jazdid.com/terminology.md).

# Terminology

* **Label**: An individual component of a **name**, such as 'alice' in 'alice.bab'.
* **Labelhash**: The keccak256 hash of an individual **label**.
* **Name**: A DID identifier such as 'alice.bab'. **Names** may consist of multiple parts, called **labels**, separated by dots. The **name** of JazDID is composed of label and registrar contract address, such as '**alice.ff1ae60287ed0c8a32e6fc6f9afe35ea3a726efc**',this design is different from ENS. The advantage is that two identical TLDs can be issued on the same chain. Of course, we will avoid this from happening.
* **Namehash**: The algorithm used to process an **name** and return a cryptographic hash uniquely identifying that **name**. **Namehash** takes a **name** as input and produces a **node**.
* **Node**: A cryptographic hash(**namehash**) uniquely identifying a **name**. 

  > node = namehash(name).
* **Registrant**: The owner of a name is the entity referenced in the registry's owner field. An owner may transfer ownership, set a resolver or TTL.
* **Registrar**: A registrar is a contract responsible for allocating subdomains. Registrars can be configured at any level, and are pointed to by the owner field of the registry.
* **Registration**: A registration is a registrar's record of a user's ownership of a name. This is distinct from the owner field in the Registry; registrations are maintained in the registrar contract and additionally store information on expiry date, fees paid, etc.
* **Registry**: The registry maintains a mapping from domain name (., .x, .y.x) to owner, resolver, and time-to-live.
* **Resolver**: A resolver is a contract that maps from name to the resource (e.g., cryptocurrency addresses, content hash, etc). Resolvers are pointed to by the resolver field of the registry.