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Download Isomorphic Tool — Checkpoint

| Error Message | Likely Cause | Solution | | :--- | :--- | :--- | | 404 Not Found | The checkpoint height is too old (pruned) | Use checkpoint list --limit 10 to find recent heights. | | Checksum mismatch | Corrupt download or man-in-the-middle | Delete the file and re-download using wget -c or curl -C - . | | Unsupported compression | Missing zstd library | Install: sudo apt install zstd -y | | Out of memory | RAM insufficient for checkpoint size | Increase swap space: sudo fallocate -l 8G /swapfile | | Application hash mismatch | Wrong network (mainnet vs testnet) | Re-download with --network testnet flag. | Manual downloads are fine for one-off setups, but production validators need automation. Here is a cron script that will download Isomorphic Tool Checkpoint weekly and roll back if corruption is detected.

Expected output: checkpoint_1234567.tar.zst: OK For validators, verify the GPG signature. download isomorphic tool checkpoint

isomorphic-tool checkpoint list --network mainnet --output json Look for the field download_url . It will look like: https://checkpoints.isomorphic.org/mainnet/checkpoint_1234567.tar.zst Use wget with resume capability (vital for large files): | Error Message | Likely Cause | Solution

echo "$(date): Starting checkpoint download for height $LATEST_HEIGHT" >> $LOG_FILE wget -q https://checkpoints.isomorphic.org/mainnet/checkpoint_$LATEST_HEIGHT.tar.zst -O $DATA_DIR/new.tar.zst Verify EXPECTED_SHA=$(curl -s https://checkpoints.isomorphic.org/mainnet/SHA256SUMS | grep $LATEST_HEIGHT | cut -d ' ' -f1) ACTUAL_SHA=$(sha256sum $DATA_DIR/new.tar.zst | cut -d ' ' -f1) | Manual downloads are fine for one-off setups,

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| Error Message | Likely Cause | Solution | | :--- | :--- | :--- | | 404 Not Found | The checkpoint height is too old (pruned) | Use checkpoint list --limit 10 to find recent heights. | | Checksum mismatch | Corrupt download or man-in-the-middle | Delete the file and re-download using wget -c or curl -C - . | | Unsupported compression | Missing zstd library | Install: sudo apt install zstd -y | | Out of memory | RAM insufficient for checkpoint size | Increase swap space: sudo fallocate -l 8G /swapfile | | Application hash mismatch | Wrong network (mainnet vs testnet) | Re-download with --network testnet flag. | Manual downloads are fine for one-off setups, but production validators need automation. Here is a cron script that will download Isomorphic Tool Checkpoint weekly and roll back if corruption is detected.

Expected output: checkpoint_1234567.tar.zst: OK For validators, verify the GPG signature.

isomorphic-tool checkpoint list --network mainnet --output json Look for the field download_url . It will look like: https://checkpoints.isomorphic.org/mainnet/checkpoint_1234567.tar.zst Use wget with resume capability (vital for large files):

echo "$(date): Starting checkpoint download for height $LATEST_HEIGHT" >> $LOG_FILE wget -q https://checkpoints.isomorphic.org/mainnet/checkpoint_$LATEST_HEIGHT.tar.zst -O $DATA_DIR/new.tar.zst Verify EXPECTED_SHA=$(curl -s https://checkpoints.isomorphic.org/mainnet/SHA256SUMS | grep $LATEST_HEIGHT | cut -d ' ' -f1) ACTUAL_SHA=$(sha256sum $DATA_DIR/new.tar.zst | cut -d ' ' -f1)