> For the complete documentation index, see [llms.txt](https://docs.exsat.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.exsat.network/guides-of-data-consensus/utxo-initialization/verify-the-data-uploaded-to-exsat.md).

# Verify the data uploaded to exSat

We offer a range of tools and resources to help you verify the consistency of block headers and UTXO data with the Bitcoin network, as well as exSat snapshot to verify the consistency of source data with the onchain data.

### Data sources:

* [Block headers prior to 840,000](https://s3.amazonaws.com/exsat.initialize.data/block_headers_lt_840000.csv.zip)
* [UTXO data prior to 840,000](https://s3.amazonaws.com/exsat.initialize.data/utxo_lt_840000_ordered.csv.7z)
* [exSat snapshot with uploaded data](https://s3.amazonaws.com/exsat.initialize.data/spring-snapshot-utxo-mainnet.zip)

### Verification solutions

You can verify the accuracy of the above data using any of the following methods, or you may use your own preferred methods and tools for verification.

* [Methods and tools used by exSat for data initialization and verification](https://github.com/exsat-network/exsat-initialize-data)

### Audit Reports

[UTXO Data Initialization Audit Report by BlockSec](/security-reports/audit-report-from-blocksec.md#report-for-utxo-data-before-block-height-84-000).


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