# Trusted Timestamping

### Direct Link

<https://app.oklg.io/#/timestamping>

### Smart Contract

<https://github.com/moontography/contracts/blob/master/contracts/OKLGTrustedTimestamping.sol>

### How many supported blockchains?

All OKLG-supported blockchains

### Cost of using service?

$2 USD per digital signature stored

### How to add a digital signature to the blockchain?

1. Once in the Trusted Timestamping dApp, you can simply click the **Add File to Calculate its Signature** button.\ <img src="/files/-MgNn4NBOkrp-3XjJfQO" alt="" data-size="original"><br>
2. The signature (or SHA256 hash of the file contents) will show in the UI. You can now click **Submit File Signature to Blockchain** to initiate the transaction.\ <img src="/files/-MgNnzqyfGF2n9c5g1FM" alt="" data-size="original"> <br>
3. You can now review all of your digital signatures you've stored in the table below. Note the signatures are tied to the address, so if/when you ever switch addresses your list will obviously reset. <img src="/files/-MgNoG7BezCeIsCGNGK0" alt="" data-size="original"> <br>


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# 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://docs.oklg.io/dapps/trusted-timestamping.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.