> 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.md).

# UTXO Initialization

exSat begins synchronizing and processing Bitcoin blocks starting from block height 840,000. For Bitcoin data before block 840,000, including UTXOs and block headers, the data is gathered and verified before being uploaded to the exSat network in a fully verifiable manner.

To ensure the accuracy and integrity of this data initialization process, the following requirements should be met:

* The UTXO and block header data to be uploaded to exSat must be accurate and verifiable, allowing any party, including professional auditing firms, to review and verify the data.
* Once uploaded, the data on the exSat chain must exactly match the prepared data. A snapshot of the exSat chain should be provided for anyone, including auditing firms, to inspect and verify the consistency between the prepared data and the data on the exSat chain.


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