# Block checksum mismatch - fatal LevelDB error

**URL:** <https://community.umbrel.com/t/block-checksum-mismatch-fatal-leveldb-error/10124>\
**Category:** Support and Troubleshooting\
**Created:** [November 2, 2022, 11:59pm UTC](https://community.umbrel.com/t/block-checksum-mismatch-fatal-leveldb-error/10124 "2022-11-02T23:59:07Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jgschulze](https://avatars.discourse-cdn.com/v4/letter/j/f1d935/32.png) [@jgschulze](https://community.umbrel.com/u/jgschulze)\
**Post date:** [November 2, 2022, 11:59pm UTC](https://community.umbrel.com/t/block-checksum-mismatch-fatal-leveldb-error/10124/1 "2022-11-02T23:59:07Z")

</div>

Please help! The bitcoin app on Umbrel won’t load properly. When I ran the bitcoin logs I received the following:

2022-11-02T23:56:06Z Verifying last 6 blocks at level 3  
2022-11-02T23:56:06Z [0%]…[16%]…[33%]…LevelDB read failure: Corruption: block checksum mismatch: /data/.bitcoin/chainstate/1903958.ldb  
2022-11-02T23:56:12Z Fatal LevelDB error: Corruption: block checksum mismatch: /data/.bitcoin/chainstate/1903958.ldb  
2022-11-02T23:56:12Z You can use -debug=leveldb to get more complete diagnostic messages  
2022-11-02T23:56:12Z Fatal LevelDB error: Corruption: block checksum mismatch: /data/.bitcoin/chainstate/1903958.ldb  
2022-11-02T23:56:12Z : Error opening block database.  
Please restart with -reindex or -reindex-chainstate to recover.  
2022-11-02T23:56:12Z Aborted block database rebuild. Exiting.  
2022-11-02T23:56:12Z Shutdown: In progress…  
2022-11-02T23:56:17Z scheduler thread exit  
2022-11-02T23:56:17Z Fatal LevelDB error: Corruption: block checksum mismatch: /data/.bitcoin/chainstate/1903958.ldb  
2022-11-02T23:56:17Z You can use -debug=leveldb to get more complete diagnostic messages  
2022-11-02T23:56:17Z \*\*\* System error while flushing: Fatal LevelDB error: Corruption: block checksum mismatch: /data/.bitcoin/chainstate/1903958.ldb  
2022-11-02T23:56:17Z Error: A fatal internal error occurred, see debug.log for details  
2022-11-02T23:56:17Z ForceFlushStateToDisk: failed to flush state (System error while flushing: Fatal LevelDB error: Corruption: block checksum mismatch: /data/.bitcoin/chainstate/1903958.ldb)  
2022-11-02T23:56:17Z Fatal LevelDB error: Corruption: block checksum mismatch: /data/.bitcoin/chainstate/1903958.ldb  
2022-11-02T23:56:17Z You can use -debug=leveldb to get more complete diagnostic messages  
2022-11-02T23:56:17Z \*\*\* System error while flushing: Fatal LevelDB error: Corruption: block checksum mismatch: /data/.bitcoin/chainstate/1903958.ldb  
2022-11-02T23:56:17Z Error: A fatal internal error occurred, see debug.log for details  
2022-11-02T23:56:17Z ForceFlushStateToDisk: failed to flush state (System error while flushing: Fatal LevelDB error: Corruption: block checksum mismatch: /data/.bitcoin/chainstate/1903958.ldb)  
2022-11-02T23:56:19Z Shutdown: done

A few seconds later it looks like Bitcoin Core starts back up then reaches the same error and repeats. Any suggestions?