> ## Documentation Index
> Fetch the complete documentation index at: https://docs.optimism.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Accessing pre-regenesis history

> Learn how to access pre-regenesis history using the Etherscan CSV exporting tool.

This guide explains how to access transaction history between 23 June 2021 and the final regenesis.
Because of our final regenesis on 11 November 2021, older transactions are not part of the current blockchain and do not appear on [Etherscan](https://explorer.optimism.io/?utm_source=op-docs\&utm_medium=docs).

<Info>
  Event and transaction-status data from January to July 2021 was partially lost and cannot be fully recovered.
  See [lost pre-regenesis data](/op-mainnet/pre-bedrock-history/lost-pre-regenesis-data) for what is missing, why, and the impact.
</Info>

## Dune access

You can use a query on [Dune Analytics](https://dune.com), similar to [this query](https://dune.com/queries/354886?addr=%5Cx25E1c58040f27ECF20BBd4ca83a09290326896B3).
You have to log on with a Dune account, but their free tier is sufficient.

<Steps>
  <Step title="Browse to the [OVM1.0 User Address Transactions](https://dune.com/optimismfnd/OVM1.0-User-Address-Transactions) Dashboard on Dune." />

  <Step title="Enter the address you wish to search in the `Address` text box in the top left." />

  <Step title="Run the query (This requires log in. A free Dune account is sufficient)." />
</Steps>

Alternatively, to run custom queries in Dune, you can use the `optimism_legacy_ovm1` schema defined in [Dune Docs here](https://dune.com/docs/data-tables/?h=ovm#optimism).