> For the complete documentation index, see [llms.txt](https://docs.20lab.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.20lab.app/solana-features/unchangeable-spl-values.md).

# Unchangeable SPL values

### Understanding Solana Token Immutability

On Solana, any features you select during the token generation phase will be permanently saved on-chain. This is an important aspect of blockchain technology that ensures transparency and trust. Some of these features can be modified by authority wallets later, but others are completely immutable once your token is deployed.

Make sure you carefully consider these settings before deploying your token, as they will be permanent for the entire lifetime of your token.

### Completely Unchangeable Values

Here are all the values that cannot be changed after your token is created (**even by authority wallets**):

#### General Token Properties

* **Blockchain**: The network your token is deployed on (Solana Mainnet, Testnet, or Devnet)
* **Decimals**: The number of decimal places your token supports (affects how divisible your token is)
* **Total supply**: The maximum number of tokens that can ever exist (unless Mintable feature is enabled and mint authority is not revoked)

#### Optional Features

* **Non-transferable token feature**: Once enabled, this feature cannot be disabled - tokens will remain permanently non-transferable

### What Can Still Be Changed

The rest of the token values can be modified later by authority wallets within the same or similar limits as available in the generator.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.20lab.app/solana-features/unchangeable-spl-values.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.