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CAT1 Snapshot Generation


CAT1 will reach its end of life at block 2,311,760, which will occur on July 26, 2022 at around 17:00 UTC.

For more information on this end-of-life process, see the Intro and FAQ page.

This document will show CAT1 issuers how to:

  1. Generate a snapshot of their CAT1 status. This will show the puzzle hash (address) and value of each individual token at the end-of-life block height
  2. Export their required data from the snapshot

After completing this, CAT issuers will be able to proceed to the Token Reissuance guide.

Generate a CAT1 Snapshot​


We recommend that you follow this section to generate your own snapshot of your CAT1 tokens. Please note that this process could take over 40 hours to complete. For your convenience and reference, we will also publish our own snapshot, which should be identical to the snapshot that you produce.

This section will show you how to install the CAT-addresses tool and use it to get a snapshot of the puzzle hash (address) and value of each coin of a particular CAT1. It can even obtain this info for all CAT1s on Chia's blockchain.'


In order to use this tool, you are required to run a fully synced Chia node. This node must be running version 1.5 or greater. Please ensure that you have satisfied both of these requirements before continuing.

  1. Open a terminal window and ensure you have direct access to the chia command by doing one of the following:

    1. If you previously installed Chia from a binary build, then set up an alias to the chia command:

    Ensure that you replace <USERNAME> and <VERSION> with the actual folders

    Set-Alias -Name chia "C:\Users\<USERNAME>\AppData\Local\chia-blockchain\app-<VERSION>\resources\app.asar.unpacked\daemon\chia.exe"
    1. If you previously installed Chia from source, then navigate to the chia-blockchain directory and activate your virtual environment:
  2. Run the following command:

    chia version

    If step 1 was successful, you should see a version number in the output, such as 1.5.0. This is a requirement for the snapshot tool to work.

  3. From the same terminal window, create a new directory in which to install the CAT-addresses repository (it can be in the parent directory) and run the following:

    git clone -b main
  4. The following environment variables need to be set in order to use this tool:

    1. FULL_NODE_HOSTNAME - The hostname of the full node to call the RPCs against. This can be localhost.
    2. DB_SOURCE_DIR - The location of the full node database on the host machine.
    3. START_HEIGHT - The height of the blockchain to start creating the snapshot from (default: 0). If you are attempting to obtain all records for your CAT, the recommended start height is 1146800, which is just before CAT1 was introduced.
    4. TARGET_HEIGHT - The height of the blockchain to end the snapshot (no default - must be set). The recommended height is 2311760, which is the last block at which CAT1 is valid.

    Running this process with the recommended block heights could take over 40 hours to complete. You may wish to test it first by setting the TARGET_HEIGHT to 1146900. This will pull data from only 100 blocks, which should only take a few seconds.

    In order to set these variables, you are recommended to put them into a file called .env at the root of the CAT-addresses project. The tool will automatically read the variables in this file. For example:

  5. Install dependencies:

    python install

    The result may contain several warnings such as WARNING: The wheel package is not available. These can be safely ignored.

    This command may take a few minutes to complete. At the end of the output, you should see something like:

    Finished processing dependencies for chia-transaction-exporter==0.1.dev55"
  6. Install the dotenv and backoff modules:

    pip install python-dotenv
    pip install backoff
  7. Set up the database:


    If you receive an error message such as ModuleNotFoundError: No module named 'chia', then make sure you can run the chia command from this directory and try again.

    If this command succeeds, then it will output:

    INFO:setup_database:Setting up database
    INFO:setup_database:Database setup complete
  8. Start the snapshot generator:


    This command will show its progress according to the block height. If you used the recommended range for START_HEIGHT and TARGET_HEIGHT in your .env file, then this command could take over 40 hours to complete. The reason it takes so long is it needs to process each block, one at a time. If multiple blocks were done in parallel, then there would be a chance that the results would not be accurate. By processing one block at a time, the tool will return the correct results for the range provided.


    You can only generate a snapshot for each block once. If you attempt to run this command over a range against which it has already been run, you will receive an error containing this message:

    sqlite3.IntegrityError: UNIQUE constraint failed: coin_create.coin_name

    In this case, you either need to start from a higher height, or (recommended) start over. Follow the Data Cleanup section and try again.

Export Your Data from the Snapshot​

Once you have populated the database with a snapshot, you can run a data export.

  1. Navigate to

  2. Search for your CAT. We'll use CAT King Cole for this example. Note the TAIL hash, which is listed above the title of the token. In this example, it's:

  3. Generate a CSV file containing all inner puzzle hashes and amounts for your CAT:

    python --output-dir <OUTPUT-DIR>\<PREFIX> --tail-hash <TAIL-HASH> --coins
    Example command
    python --output-dir C:\Users\Username\Chia\CAT-addresses\results\CKC_ --tail-hash 1121996b75cce3c746369aced2c8887b02b84e95592c3dc006d82a145adf349a
    • <OUTPUT-DIR> - a directory of your choice in which to save the CSV file
    • <PREFIX> - a string to be prepended to the output file name
    • <TAIL-HASH> - the TAIL hash you obtained from
    • --coins - an optional flag that will add information about individual coins to the output (which might be helpful for auditing purposes) :::

    This command will not create any directories, so make sure <OUTPUT-DIR> already exists before running it. Otherwise, you will receive a FileNotFoundError. :::

Fix EOL Characters​

This step is required for Windows users, and not needed for Linux or macOS users.

If you are running on Windows, the CSV file will contain an extra CR (carriage return) character at the end of each line. This will cause "Secure the Bag" to fail. First, you must convert the CSV file to use UNIX-style end-of-line characters.

The easiest way to accomplish this is with dos2unix. This is not included with Windows, so you will need to download it from SourceForge.

Steps to convert the CSV file:

  1. Visit the SourceForge dos2unix site.
  2. Click the green "Download" button. After five seconds, the dos2unix zip file will be downloaded to your Downloads folder.
  3. Unzip the dos2unix zip file.
  4. From a PowerShell window, run:
<path to dos2unix.exe> -o <path to CSV file>

For example:

~\Downloads\dos2unix\bin\dos2unix.exe -o .\results\CKC_1121996b75cce3c746369aced2c8887b02b84e95592c3dc006d82a145adf349a.1658233083.183527.csv

This message should appear in the output:

dos2unix: converting file <CSV file> to Unix format...
  1. To verify that the conversion was successful, open the file. There should be no blank lines between the entries.

Data Cleanup​

Optional: If the application exits partway through a run, it will only have imported some blocks at a particular height. You can delete the records from the database at and above a provided height by running the following command:

python --height <BLOCK-HEIGHT>

Export Data for all CATs​

Optional: If you wish to obtain the balance of all CATs on the Chia blockchain, you can run export-py with various different options:

The --tail-hash flag can be dropped, resulting in an output of a single CSV file containing every puzzle hash amount for every CAT on the Chia blockchain:

python --output-dir <OUTPUT-DIR>\<PREFIX>

The --coins flag can be added, which will add information about individual coins:

python --output-dir <OUTPUT-DIR>\<PREFIX> --coins

The --explode flag can be added, which will generate multiple CSV files, each of which containing a single CAT's puzzle hashes and amounts:

python --output-dir <OUTPUT-DIR>\<PREFIX> --explode

You can also use the --explode and --coins flags together, which will generate individual CSV files that also contain coin info.