# 3.3. Deterministic bitcoin commitments

Deterministic bitcoin commitments (DBC) provide a way to create provably unique commitments inside bitcoin transactions. RGB protocol allows two types of DBC: based on taproot outputs (so-called “**tapret**”) and based on `OP_RETURN` outputs (so-called “**opret**”), useful for old hardware which doesn’t support taproot.


---

# Agent Instructions: 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://black-paper.rgb.tech/consensus-layer/3.-client-side-validation/3.3.-deterministic-bitcoin-commitments.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.