Gnoland Topaz Snapshot

POSTHUMAN publishes a verified LZ4 snapshot from a dedicated non-signing Topaz RPC node.

• Latest archive: https://snapshots-gnoland.posthuman.digital/gnoland_topaz-1-latest.tar.lz4
• SHA-256: https://snapshots-gnoland.posthuman.digital/SHA256SUMS
• Metadata: https://snapshots-gnoland.posthuman.digital/snapshot.json

The archive contains only db/ and wal/. It never contains secrets/, configuration, genesis, or validator signer state.

Restore

Set the data directory used by your service:

GNO_HOME="$HOME/gnoland-topaz"
DATA_DIR="$GNO_HOME/data"
SNAPSHOT_URL=https://snapshots-gnoland.posthuman.digital
TMP_DIR=$(mktemp -d)
BACKUP_DIR="$HOME/gnoland-backup-$(date -u +%Y%m%dT%H%M%SZ)"

Stop the service and back up identity, configuration, and genesis:

sudo systemctl stop gnoland.service
install -d -m 0700 "$BACKUP_DIR"
cp -a "$DATA_DIR/secrets" "$DATA_DIR/config" "$DATA_DIR/genesis.json" \
  "$BACKUP_DIR/"

Download and verify the archive before replacing data:

curl -fL --retry 3 \
  -o "$TMP_DIR/gnoland_topaz-1-latest.tar.lz4" \
  "$SNAPSHOT_URL/gnoland_topaz-1-latest.tar.lz4"
curl -fL --retry 3 \
  -o "$TMP_DIR/SHA256SUMS" \
  "$SNAPSHOT_URL/SHA256SUMS"

cd "$TMP_DIR"
sha256sum -c SHA256SUMS
lz4 -t gnoland_topaz-1-latest.tar.lz4
if lz4 -dc gnoland_topaz-1-latest.tar.lz4 \
  | tar -tf - \
  | grep -Evq '^(db|wal)(/|$)'; then
  echo "Unexpected snapshot path"
  exit 1
fi

After successful verification, preserve the old database and restore the new one:

mv "$DATA_DIR/db" "$BACKUP_DIR/db.old"
mv "$DATA_DIR/wal" "$BACKUP_DIR/wal.old"
lz4 -dc "$TMP_DIR/gnoland_topaz-1-latest.tar.lz4" \
  | tar -xf - -C "$DATA_DIR"
sudo systemctl start gnoland.service

Verify chain, progress, and service health:

systemctl is-active gnoland.service
curl -fsS http://127.0.0.1:26657/status | jq '.result | {
  network: .node_info.network,
  height: .sync_info.latest_block_height,
  catching_up: .sync_info.catching_up,
  voting_power: .validator_info.voting_power
}'
sudo journalctl -u gnoland.service --since '10 minutes ago' --no-pager

Keep the old db/ and wal/ until the restored node is synced and stable. For a validator, independently verify recent signatures before deleting the rollback copy.

AppHash mismatch recovery

If the node crashes with an AppHash mismatch, preserve logs and the current db/ + wal/ for forensics. Restore only those directories from a known healthy backup or this verified snapshot. Never overwrite validator keys, node identity, configuration, genesis, or signer state.