Thanks in advance. I have a RPi 5 with 8G, and my power went out and now I have this error:
“[error] txindex: best block of the index not found. Please rebuild the index. Error: txindex: best block of the index not found. Please rebuild the index](/t/2025-07-09t1112z-error-txindex-best-block-of-the-index-not-found-please-rebuild-the-index-error-txindex-best-block-of-the-index-not-found-please-rebuild-the-index/23226)”
Any help is much appreciated.
What app is this for?
Bitcoin node, latest version. Thanks
find bitcoin core folder and type bitcoind -rescan
This does not seem to be working from the Umbrel terminal. Any other feedback? Thx
I was in the following directory: umbrel@umbrel:~/umbrel/app-data/bitcoin/data/bitcoin$
Hey @jharris9999, I might first suggest if you are running new on this to just uninstall Bitcoin Node apps and reinstall it easier. Just uninstall any dependent applications and let us know if there’s any issue there.
Analyzing your previous posts I noticed you mentioned you’re “Running a Raspi 5, with 8 GB, 2T hard drive attached via USB…” I am thinking you may want to make sure all these connections are secure for your Pi 5 in maybe a kit you got and you’re using the official Pi 5 Power Supply included in the official kit and it’s plugged in securely to a reliable power source. Any fluctuation of power here you will continue to have issues with corruptions.
Furthermore, the official FAQ here has removed some of the issues that were redundant in the past such as the peers.dat errors that was patched in the latest versions of Core and things like replacing the timechain manually or using a command to reindex which I believe is also an easier setting maybe somewhere in Bitcoin Node App too and its UI should usually be easily accessible to restart and things without needing to SSH in, and those I believe were removed as not necessary now as things have been improved with the older deprecated commands, after Umbrel’s impressive new umbreld refactor.
These were the previous commands, but before attempting again I might recommend instead @jharris9999 just try securing connections and re-installing (right click apps uninstall, reinstall), use offiical PSU if available and you can also open a Discord Support ticket to ask about any other specific errors maybe or @smolgrrr can hop in on reindex command advice i see the directory for me is ~/umbrel/app-data/bitcoin/data/bitcoin, anything further here are just for reference I don’t think may be needed here as just re-installing and installing will fix ur issue and sync again and end up saving you time… indexing though does not harm currently synced blocks but takes a while and sounds like you have an earlier corruption on a block I assume and we are currently on block 908428 as I type this 
, if you have something like a gigabit connection it shouldn’t take you more than ~24 hours…
All this after here is just referencing from the previous FAQ, as don’t see it in the newer one:
Resolving a corrupted blockchain is a time-consuming process if this persists (to keep running that). Depending on the size of the blockchain and the speed of your device, this process can take several days. It is important to be patient and not interrupt the process, as interrupting it may result in needing to restart the process from the beginning.
Previous steps from FAQ:
Connect to your Umbrel device by following the instructions in How to SSH into umbrelOS on Umbrel Home or Rasberry Pi or by accessing a terminal on your Linux machine.
Run the following command to open bitcoin.conf in a nano text editor. If you are on a Linux machine, you may need to replace
~/umbrelwith the path to your installation directory, as described in Troubleshooting on Linux:sudo nano ~/umbrel/app-data/bitcoin/data/bitcoin/umbrel-bitcoin.confAdd the following line to the file:
reindex=1orreindex-chainstate=1Save and exit the file by pressing
CTRL+X, thenY, and thenENTER.Restart your Bitcoin node by running the following command:
sudo ~/umbrel/scripts/app restart bitcoinYour Bitcoin node will now start the process of reindexing. You can monitor the reindexing progress of your node by accessing your Bitcoin Node app through the browser.
After your node is fully synced, follow the same steps to remove
reindex=1/reindex-chainstate=1from thebitcoin.conffile and restart your Bitcoin Node. If you do not do this, then the lengthy process of reindexing will occur again the next time your node restarts.Note: It may also take some time for dependant apps like Electrs to resume functioning after the reindex is the complete.
I would strongly discourage you from just uninstalling apps and their dependencies.
If you run LND, you may never know if umbrel app store uninstalls LND too, and then your node is poof.
Here is the proper way how to reindex bitcoind:
sudo nano ~/umbrel/app-data/bitcoin/data/bitcoin/bitcoin.conf
Add reindex=1
Restart bitcoin App via UI, sudo docker restart bitcoin_app_1 or a full reboot.
Check logfiles whether reindex has started with
sudo docker logs -n 100 -f bitcoin_app_1
if reindexing has started, which will take hours, likely days, ensure you comment out the reindex command, otherwise each time a reindex will take place:
# reindex=1
Yeah for sure, I think OP is having persistent issues on only Bitcoin Node and their setup,
but for sure want to specify if you have any issue with dependent applications if they are installed (don’t uninstall Lightning Node without your seed phrase… or like reset your Umbrel if you have important files on it without backup up first of course), as you want to make sure they are backed up before making any drastic changes.
Sometimes there are other persistent issues like on lower powered devices, Raspberry Pis, laptops etc. that help with reinstalling only if you are sure you don’t have anything else you don’t need backed up first, so that’s why I recommended it to troubleshoot as a quicker option as doesn’t look like anything else has worked yet as a quicker fix, i.e. fixing corruptions / non official Pi 5 power supply may resolve quicker than reindexing and hitting that corruption again, and asked to specify if he had any other issues…
Umbrel · Support for more real-time help from the community too in like Discord this user looks like they been posting on forum with syncing issues like a year ago too for a while like on Pi 4 / Pi 5 let us know how it goes @jharris9999 if it’s resolved yet…