# GenesisZ - Mine the Genesis Block for your Zcashy altcoin

**URL:** <https://forum.zcashcommunity.com/t/genesisz-mine-the-genesis-block-for-your-zcashy-altcoin/29041>\
**Category:** Zcash Apps\
**Created:** [May 17, 2018, 10:23am UTC](https://forum.zcashcommunity.com/t/genesisz-mine-the-genesis-block-for-your-zcashy-altcoin/29041 "2018-05-17T10:23:57Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![sebstar](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/sebstar/32/2883_2.png) [@sebstar](https://forum.zcashcommunity.com/u/sebstar)\
**Post date:** [May 17, 2018, 10:23am UTC](https://forum.zcashcommunity.com/t/genesisz-mine-the-genesis-block-for-your-zcashy-altcoin/29041/1 "2018-05-17T10:23:57Z")

</div>

# GenesisZ

Hi Zcashers,

I’ve developed a python tool for mining Zcash based altcoin genesis blocks, that is, altcoins using the Equihash PoW algorithm and block layouts as used by zcash. I release the tool under the GPLv3 license and welcome any feedback. See README.md for further information.

[You can find it on Github.](https://github.com/sebastianst/GenesisZ)

## Features

- Modify every parameter that influences the block header hash (see _Usage_)
- Support for silentarmy
- Sensible defaults
- Placeholders of the form `{BTC}`, `{ETH}` or `{ZEC}` in the `TIMESTAMP` input string get translated to the currency’s latest block number and hash.
- Uses the [`python-zcashlib`](https://github.com/sebastianst/python-zcashlib), which is a (still very much unfinished) extension of the well-known [`python-bitcoinlib`](https://github.com/petertodd/python-bitcoinlib).

## Examples

### Zcash mainnet

Mine the zcash mainnet gensis block with the silentarmy solver by calling

```bash
./genesis.py -s "/path/to/sa-solver" -r 5000 -t 1477641360

```

or cheat, because you already know the right nonce:

```bash
./genesis.py -s "/path/to/sa-solver" -n 1257 -t 1477641360

```

### Zcash testnet

This time using Tromp’s solver with 4 threads, checking up to 10 nonces.

```bash
./genesis.py -c testnet -t 1477648033 -b 0x2007ffff -E 0x1f07ffff -s '/path/to/equihash/equi' -T 4 -r 10

```

It will find the right solution for nonce `6`.

### Zcash regtest

Using Tromp’s `48,5` solver with

```bash
./genesis.py -c regtest -t 1296688602 -b 0x200f0f0f -E 0x1f07ffff -s '/path/to/equihash/eq485' -T 4 -r 10

```

will find the correct regtest solution for nonce `9`.

### Zclassic mainnet

Zclassic decided to use a custom extra nonce of `0x1d00ffff`. Let’s mine their  
mainnet solution (already setting the right nonce to `0x00...021d`) with

```bash
./genesis.py -c mainnet -t 1478403829 -E 0x1d00ffff -C Zclassic -z "No taxation without representation. BTC #437541 - 00000000000000000397f175a94dd3f530b957182eb2a9f7b79a44a94a5e0450" -s '/path/to/equihash/equi' -T 4 -n 21d

```

---

<div class="post-metadata">

**Author:** ![Fick1995](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/fick1995/32/16286_2.png) [@Fick1995](https://forum.zcashcommunity.com/u/Fick1995)\
**Post date:** [June 9, 2020, 3:53pm UTC](https://forum.zcashcommunity.com/t/genesisz-mine-the-genesis-block-for-your-zcashy-altcoin/29041/3 "2020-06-09T15:53:01Z")

</div>

Great articlle thanks for sharing. After mining the genesis block I cant discern out how to mine coins, it says this coin is the use of scrypt but whilst I try to mine it with a cpu miner i continually get “accepted: 0/1 (0.00%), 47.03 khash/s (booooo)” Any ideas?