The resulting file after running monero-blockchain-blackball is a data.mdb LMDB file. Unfortunately, this file cannot be opened directly by the GUI or CLI. How can I extract the necessary data so that the wallet can read it?
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1 Answer
You will need to follow these steps to convert the database to a list of outputs that the wallet can read. I have performed this conversion on Debian/Ubuntu.
In order to extract the data, you need to build the LMDB tools. Follow the instructions on GitHub to make the LMDB binaries.
cd ~/monero/external/db_drivers/liblmdb
make
Then run the following:
./mdb_stat -a /folder/with/blackball/database
This will show the hash of the database that you have created. Take a note of the database name (eg: blackballs-418015bb9ae982a1975da7d79277c2705727a56894ba0fb246adaabb1f4632e3). You will use it in the next step.
You now need to extract the outputs that need to be blackballed. Use one of the following:
./mdb_dump -s blackballs-<hash> /folder/with/blackball/database/ | awk '/[0-9a-f]{64}/{print $1}' > /output/path/file.txt
./mdb_dump -s blackballs-<hash> /folder/with/blackball/database/ | grep ^.................................................................$ | tr -d \ > /output/path/file.txt
The resulting .txt file can be imported into the official GUI and CLI.
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1For the record, the database name will always be blackballs-418015bb9ae982a1975da7d79277c2705727a56894ba0fb246adaabb1f4632e3 for mainnet, which is what the vast majority of people will need a list for. Aug 27, 2018 at 15:03