> For the complete documentation index, see [llms.txt](https://docs.bitbadges.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bitbadges.io/token-standard/queries/get-eth-signature-tracker.md).

# GetETHSignatureTracker

Retrieves the number of times a given signature has been used for a specific ETH signature challenge tracker.

## Proto Definition

```protobuf
message QueryGetETHSignatureTrackerRequest {
  string collectionId = 1;
  string approvalLevel = 2; // "collection", "incoming", or "outgoing"
  string approverAddress = 3; // Leave blank if approvalLevel is "collection"
  string approvalId = 4;
  string challengeTrackerId = 5;
  string signature = 6;
}

message QueryGetETHSignatureTrackerResponse {
  string numUsed = 1; // Number of times this signature has been used
}
```

## Usage Example

```bash
# CLI query
bitbadgeschaind query tokenization get-num-used-for-eth-signature-challenge [collectionId] [approvalLevel] [approverAddress] [approvalId] [challengeTrackerId] [signature]

# REST API
# Note for blank values, use "" so you may have // in the query
curl "https://lcd.bitbadges.io/bitbadges/bitbadgeschain/tokenization/get_eth_signature_tracker/1/collection//approval-123/challenge-1/bb1..."
```

### Response Example

```json
{
    "numUsed": "1"
}
```

## Notes

* Each signature can only be used once per challenge tracker
* If a signature has never been used, the response will be "0"
* The signature parameter should be the full Ethereum signature (0x-prefixed hex string)


---

# 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, and the optional `goal` query parameter:

```
GET https://docs.bitbadges.io/token-standard/queries/get-eth-signature-tracker.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.