corrupted database or on wrong chain -> resync with bootstrap or reindex

[mst100]

Windows

fastest way to get back on mining on right chain is to resync with bootstrap

stop mining and exit your wallet

go to zettelkasten blockcahin folder -> %appdata%\ZettelKasten

and delete everything except zettelkasten.conf and wallet.dat

download and extract bootstrap
https://zettelkasten.org/downloads/bootstrap.zip

start wallet again

now after you done this it will take for some while, it need to reindex and sync to current block

[mst100]

Linux daemon

fastest way to get back on mining on right chain is to resync with bootstrap

if you already don't have installed unzip

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sudo apt install unzip

stop your daemon:

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cd ~/zettelkasten/src
./zettelkastend stop

go to zettel blockchain folder:

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cd ~/.zettelkasten

and delete everything except zettelkasten.conf and wallet.dat

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rm -Rf blocks  chainstate  db.log  debug.log  peers.dat

download and extract bootstrap, and delete zipped bootstrap:

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wget https://zettelkasten.org/downloads/bootstrap.zip
unzip bootstrap.zip 
rm -f bootstrap.zip 

start daemon again:

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cd ~/zettelkasten/src 
./zettelkastend

all steps in one line:

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cd ~/.zettelkasten && rm -Rf blocks  chainstate  db.log  debug.log  peers.dat && wget https://zettelkasten.org/downloads/bootstrap.zip && unzip bootstrap.zip && rm -f bootstrap.zip && cd ~/zettelkasten/src && ./zettelkastend

now after you done this it will take for some while, it need to reindex and sync to current block

[mst100]

if even after bootstrap usage you get

: You need to rebuild the database using -reindex to change -txindex.
Do you want to rebuild the block database now?

do CTRL+C
and
./zettelkastend -reindex

it will took some time till reindex