Fast-sync your Zclassic node with pre-downloaded blockchain data.
DISCLAIMER: This software and data are provided "AS IS", without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose, and noninfringement. By downloading or using the bootstrap data, you acknowledge and agree that:
- USE AT YOUR OWN RISK. The authors and contributors are not liable for any loss of funds, data corruption, or damages arising from the use of this software or data.
- ALWAYS VERIFY SHA256 CHECKSUMS before extracting any downloaded file. Do not trust files that fail checksum verification.
- ALWAYS BACKUP
wallet.datBEFORE USING BOOTSTRAP. Failure to do so may result in permanent, irreversible loss of funds.- NO FINANCIAL ADVICE. Nothing in this repository constitutes financial, investment, or legal advice. Cryptocurrency involves significant risk.
- NOT AUDITED. The blockchain data in this bootstrap has not been independently audited. Use trusted sources only.
- STOP YOUR NODE (
zclassicd) before extracting bootstrap data. Extracting while the node is running will corrupt your database.- The bootstrap contains publicly available blockchain data only (blocks, UTXO set, index) — no private keys, seeds, or sensitive information are included.
- Block Height: 3017692
- Date: 2026-02-20
- Total Size: 9.4G (compressed)
- Parts: 10 files
Cryptographic parameters required by zclassicd for shielded transactions.
- Release: zcash-params-v1
- Total Size: 1.54 GB (compressed) / 1.69 GB (uncompressed)
- Compression: zstd level 19
| File | Size | Purpose |
|---|---|---|
| sapling-spend.params | 46M | Prove shielded spends |
| sapling-output.params | 3.4M | Create shielded outputs |
| sprout-groth16.params | 692M | Legacy Sprout proofs |
| sprout-proving.key | 868M | Generate Sprout proofs |
| sprout-verifying.key | 4.0K | Verify Sprout proofs |
- macOS:
~/Library/Application Support/ZcashParams/ - Linux:
~/.zcash-params/ - Windows:
%APPDATA%\ZcashParams\
The ZipherX wallet automatically downloads and installs these parameters during bootstrap.
The ZipherX wallet will automatically download and install this bootstrap when needed.
# Download all parts from the latest release
gh release download --repo ZipherPunk/zclassic-bootstrap --pattern "*.part"
gh release download --repo ZipherPunk/zclassic-bootstrap --pattern "checksums.txt"
# Verify checksums
shasum -a 256 -c checksums.txt
# Combine parts
cat zclassic-bootstrap-20260220.tar.zst.part-*.part > zclassic-bootstrap.tar.zst- Go to the latest release
- Download all
.partfiles - Download
checksums.txt - Verify checksums:
shasum -a 256 -c checksums.txt - Combine parts:
cat zclassic-bootstrap-20260220.tar.zst.part-*.part > zclassic-bootstrap.tar.zst
# Stop zclassicd if running
zclassic-cli stop
# Backup your wallet first!
cp "$HOME/Library/Application Support/Zclassic/wallet.dat" ~/wallet.dat.backup
# Extract bootstrap
cd "$HOME/Library/Application Support/Zclassic"
zstd -d ~/Downloads/zclassic-bootstrap.tar.zst -o - | tar -x --strip-components=1
# Start zclassicd
zclassicd -daemon# Stop zclassicd if running
zclassic-cli stop
# Backup your wallet first!
cp ~/.zclassic/wallet.dat ~/wallet.dat.backup
# Extract bootstrap
cd ~/.zclassic
zstd -d ~/Downloads/zclassic-bootstrap.tar.zst -o - | tar -x --strip-components=1
# Start zclassicd
zclassicd -daemon# Stop zclassicd if running
zclassic-cli stop
# Backup your wallet first!
copy "%APPDATA%\Zclassic\wallet.dat" "%USERPROFILE%\wallet.dat.backup"
# Install zstd if not present (using winget or chocolatey)
# winget install Facebook.zstd
# OR: choco install zstd
# Navigate to Zclassic data directory
cd %APPDATA%\Zclassic
# Extract bootstrap (requires zstd in PATH)
zstd -d "%USERPROFILE%\Downloads\zclassic-bootstrap.tar.zst" -o - | tar -xf -
# Start zclassicd
zclassicdzclassic-bootstrap-20260220.tar.zst.part-00.part(1.0G)zclassic-bootstrap-20260220.tar.zst.part-01.part(1.0G)zclassic-bootstrap-20260220.tar.zst.part-02.part(1.0G)zclassic-bootstrap-20260220.tar.zst.part-03.part(1.0G)zclassic-bootstrap-20260220.tar.zst.part-04.part(1.0G)zclassic-bootstrap-20260220.tar.zst.part-05.part(1.0G)zclassic-bootstrap-20260220.tar.zst.part-06.part(1.0G)zclassic-bootstrap-20260220.tar.zst.part-07.part(1.0G)zclassic-bootstrap-20260220.tar.zst.part-08.part(1.0G)zclassic-bootstrap-20260220.tar.zst.part-09.part(374M)checksums.txt
ddfa3b6063f256241b1b028bd135603ede7a83489251e8b1d90774015c903d98 zclassic-bootstrap-20260220.tar.zst.part-00.part
275b17d15f5219db487dfba0bd761b4793b616e961dc12ce188f26cd44599924 zclassic-bootstrap-20260220.tar.zst.part-01.part
90d8992d9348a2a0e236c4a527ce4c1631bb24f311cb32c737a555f8372c33ca zclassic-bootstrap-20260220.tar.zst.part-02.part
bba982b9d0c08b225d8d7a646d5ca4a649ce57e855a063d2041766737ee0e5fd zclassic-bootstrap-20260220.tar.zst.part-03.part
65572058bbd6d619029ee8474237faeb5baad0be0371c7f942e0a312f3d4bcc4 zclassic-bootstrap-20260220.tar.zst.part-04.part
6e48fb743dcccef3e597e62ff8a89ff31abc195f8bc846a43b6f59b76e6375a0 zclassic-bootstrap-20260220.tar.zst.part-05.part
682dc02fd5b4dabbeaa74e9e873e7f8e46c27b5d6f4f3f1d333b6914db8d0f66 zclassic-bootstrap-20260220.tar.zst.part-06.part
a7e65b73f69117f04076ffbb42a64c29ff35f941ac5da3ebb5ab16d30afdc772 zclassic-bootstrap-20260220.tar.zst.part-07.part
2b4fe88fbcefb496493554ebe42d41b45fd5f9ec1cffe9abeb84dc33b2cf1004 zclassic-bootstrap-20260220.tar.zst.part-08.part
afcab1fa7906660e6ab70d1ed4b2a1bd9431ce2f7f9e5f8300331537484ec924 zclassic-bootstrap-20260220.tar.zst.part-09.part
- blocks/ - Blockchain data files
- blocks/index/ - Block index database (LevelDB)
- chainstate/ - UTXO set database (LevelDB)
- ZcashParams/ - Sapling and Sprout cryptographic parameters
- Algorithm: zstd
- Level: 19 (maximum compression)
- Ratio: ~50% better than gzip
- Enough disk space for extraction (~13 GB)
- zstd installed:
- macOS:
brew install zstd - Ubuntu/Debian:
apt install zstd - Windows: Download from zstd releases
- macOS:
- Stopped zclassicd daemon
- Always backup wallet.dat before using bootstrap
- Verify SHA256 checksums before extraction
- Compatible with Zclassic Core 1.x and ZipherX wallet
- ZipherX Wallet - Modern Zclassic wallet with automatic bootstrap
- Zclassic - Official Zclassic website
Generated with ZipherX Bootstrap Creator