zakura

Zcash network upgrade

NU7 Dashboard

Zcash's next network upgrade is coming. Check this page for progress.

  • 25-second blocks Target spacing drops from 75 seconds to 25.
  • Steadier difficulty The averaging window widens from 17 blocks to 102.
  • Fees fund the NSM 60% of transaction fees accrue to the Network Sustainability Mechanism.
  • Sprout retirement The legacy Sprout shielded pool is suspended.

Rollout

  1. Staging Testnet V3 Shutdown
  2. Testnet Active
  3. Mainnet Estimate
Best block
4,476,666
00000d82…9d816819
Header time age
24 s
At the observation time below
Median interval
17.5 s
Last 300 intervals · 17.3 s median expected at the 25 s mean target
Difficulty
11921.82
102-block averaging window
NSM fund balance
559.26 TAZ[?]TAZ is the Testnet equivalent of ZEC.
Observed reorgs · 24 h
2

HeightHashHeader time · UTC

  1. 4,476,66600000d82b30bd813f43d0432bd329b331819906944e3e86434d311d79d816819
  2. 4,476,6650000138359ae5f641e21c291a28dbaf671ca5e872a10fc6d056e4b3b09285fa6
  3. 4,476,664000019374bf9f3a15fdda0b0f7ea1530466ebb54b86d2f1e2024df2cdc503c9c
  4. 4,476,663000019ed4ab0fbd7bb36a0257e298c7426435de1bd2b92eef4be8e9520f07276
  5. 4,476,66200001b9349260a4bad2da6312a2cb434b15fdec56a0a3f358e76cf603588894c
  6. 4,476,661000015dae420b70a96605d9b0165de56cdc90054fdf88cbe2429299cb9df306d

Build-time observation ·

Run a node

Network magic
fa1af9bf
NU7 activation height
4,465,026
NU7 branch ID
77190ad9

Join standard public Testnet with the matching revision and configuration. Keep staging data separate and JSON-RPC bound to localhost. A bootstrap snapshot is optional.

Joining details captured · . Source: the operator's dashboard generation. Use standard public-Testnet parameters.

Latest block timestamp gap: 32. Minimum-difficulty eligible: false. Minimum-difficulty block: false.

Effective consensus parameters

Node revision f6f458641c035ac9440d5aa8f78d704733218101; tip height 4476666. Minimum difficulty uses block timestamp gaps, not a wall-clock countdown.

ParameterAt tipNext block
Global shielded action budget330330
Orchard actions per pool330330
Sapling spends and outputs300300
Sprout JoinSplits00
NU7 activation height4,465,0264,465,026
Base block subsidy52,083,333 zatoshis52,083,333 zatoshis
Current consensus branch ID77190ad977190ad9
Node build versionv1.6.1+gf6f458641c03v1.6.1+gf6f458641c03
Coinbase maturity100 blocks100 blocks
Difficulty averaging timespan2,550 seconds2,550 seconds
Difficulty averaging window102 blocks102 blocks
Difficulty damping factor44
Maximum difficulty adjustment down32%32%
Maximum difficulty adjustment up16%16%
Median time span11 blocks11 blocks
Minimum-difficulty gap multiplier1818
Minimum-difficulty threshold450 seconds450 seconds
Minimum-difficulty comparisonBlock timestamp gap > 450 seconds (450 does not qualify)Block timestamp gap > 450 seconds (450 does not qualify)
Proof-of-work limit07ffff000000000000000000000000000000000000000000000000000000000007ffff0000000000000000000000000000000000000000000000000000000000
Proof-of-work limit (compact)2007ffff2007ffff
Effective block height4,476,6664,476,667
Miner fee allocation40%40%
NSM fee allocation60%60%
NSM fee roundingRound down on the block aggregateRound down on the block aggregate
Minimum peer protocol version170,180170,180
NetworkTestnetTestnet
Network magicfa1af9bffa1af9bf
NSM reissuance height7,305,2227,305,222
NU7 activeYesYes
NU7 branch ID77190ad977190ad9
Parameter schema version11
Target block spacing25 seconds25 seconds
  1. Build the matching revision

    Use f6f458641c035ac9440d5aa8f78d704733218101. Build with cargo build --release --locked -p zakura --features internal-miner.

  2. Bootstrap the fork history

    One-time bootstrap snapshot

    A verified snapshot for the displayed network. Verify the checksum before restoring.

    Block height
    4,465,108
    Published · UTC
    2026-10-04 19:07 UTC
    Size
    7.24 GiB
    Storage mode
    Pruned
    DB format
    v29.1.0

    SHA-256

    495481049cbba53501fbba7501b42dd258f20aa675915d5f23765cfc356f2b23

    Direct download

    Before you restoreStop your node. The commands create a new nu7-state directory; keep public Testnet and earlier staging data separate.

    Requires curl, shasum, tar, and zstd.

    curl -fL -C - -o nu7.tar.zst \
  https://api.nu7.valargroup.dev/snapshots/nu7-public-testnet-4465108.tar.zst &&
echo '495481049cbba53501fbba7501b42dd258f20aa675915d5f23765cfc356f2b23  nu7.tar.zst' | shasum -a 256 -c - &&
mkdir nu7-state &&
tar --zstd -xf nu7.tar.zst -C nu7-state
  3. Save the configuration and start

    Save the configuration below as nu7-zakura.toml. Open inbound TCP port 18233 to accept peers. Check getblockchaininfo for the expected activation height and an advancing tip.

nu7-zakura.toml · matches the displayed networkDownload

[network]
network = "Testnet"
listen_addr = "0.0.0.0:18233"
initial_testnet_peers = [
    "167.99.103.111:18233",
    "164.92.209.78:18233",
    "206.189.148.0:18233",
]
p2p_stack = "legacy"

[rpc]
listen_addr = "127.0.0.1:18232"
enable_cookie_auth = false

[state]
cache_dir = "./nu7-state"
storage_mode = "pruned"

start · from the directory containing the configuration

./target/release/zakurad -c nu7-zakura.toml start

To mine, add your own transparent miner_address and internal_miner = true under [mining], then restart the node. The same node mines continuously; no sidecar is needed. Coinbase maturity follows the exported network rules above.

mine · optional, from the same directory

[mining]
miner_address = "YOUR_TESTNET_TRANSPARENT_ADDRESS"
internal_miner = true

Get test coins

Request coins only from a faucet verified for Public Testnet.

Each request

0.125 TAZ

Per address

Once every 24 hours

Check availability when requesting

Requests are subject to connection rate limits. Payouts are queued and subject to the faucet's daily allocation.