> For the complete documentation index, see [llms.txt](https://xpansionchain-1.gitbook.io/xpansionchain/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://xpansionchain-1.gitbook.io/xpansionchain/launch-a-collection/3.-register-a-collection.md).

# 3. Register a collection

## 3. Register a collection

A collection refers to a deployed <mark style="color:blue;">token smart contract</mark>, the tokens of which can be freely transacted (ie. minted, traded, bought and sold) on XpansionChain's layer 2.

Each collection belongs to a <mark style="color:blue;">project</mark>.

The best way to create a project is to use the <mark style="color:blue;">imx-examples</mark> repository.

🤚PRE-REQUISITES

* <mark style="color:blue;">Registering as a user</mark>
* <mark style="color:blue;">Registering a project</mark>

#### Steps:[​](https://docs.x.immutable.com/docs/x/launch-collection/register-collection#steps) <a href="#steps" id="steps"></a>

1. <mark style="color:blue;">Register a collection</mark>
2. <mark style="color:blue;">Update a collection</mark>

### 1. Register a collection[​](https://docs.x.immutable.com/docs/x/launch-collection/register-collection#1-register-a-collection) <a href="#id-1-register-a-collection" id="id-1-register-a-collection"></a>

Follow the <mark style="color:blue;">3. Add a collection</mark> steps in the imx-examples repository.

### 2. Update a collection[​](https://docs.x.immutable.com/docs/x/launch-collection/register-collection#2-update-a-collection) <a href="#id-2-update-a-collection" id="id-2-update-a-collection"></a>

Follow the <mark style="color:blue;">Update collection</mark> steps in the imx-examples repository.

**Fields that cannot be updated:**[**​**](https://docs.x.immutable.com/docs/x/launch-collection/register-collection#fields-that-cannot-be-updated)

* `contract_address`
* `metadata_api_url` - if this field is modified AFTER minting, existing assets using the previous URL will not be modified, however, the new URL will be used for new mints.

#### Increase project collection limits[​](https://docs.x.immutable.com/docs/x/launch-collection/register-collection#increase-project-collection-limits) <a href="#increase-project-collection-limits" id="increase-project-collection-limits"></a>

Collection limits can be increased by contacting <mark style="color:blue;">support</mark> about your project. Be sure to include your reason for an increase. Our team will respond to your request within 2 business days.