<p><code>chainparams.cpp</code> contains a line of code that checks whether the chain’s genesis block is equal to a specified hash. Since you created a new genesis block, you will have to update the value to your own hash.</p>

<p>You can see an example for the line here: </p>

<pre><code> hashGenesisBlock = genesis.GetHash();
 assert(hashGenesisBlock == uint256("9915158279673d101912be80f25c20627f1dd8bf5231e7c46bfec5ed19737f44"));
</code></pre>

<p>Which I took from <a href="https://github.com/miguelfreitas/twister-core/blob/master/src/chainparams.cpp#L216" rel="nofollow">miguelfreitas/twister-core/…/chainparams.cpp</a></p>

<p>To figure out what to put there, you can print <code>genesis.GetHash()</code> and replace the old hash in the assertion.</p>

<p>To print it the hash of the genesis block, you can use</p>

<pre><code>printf("genesis.GetHash = %s\n", genesis.GetHash().ToString().c_str());
</code></pre>

<p>just above the line with the assertion, which will write to the <code>~/.bitcoin/debug.log</code>.</p>

CC BY-SA 3.0
2016-01-04T12:50:50.547Z
Hi , I ave also printed the genesis.hashMerkleRoot using above example ,Please tell me where I put these hash to create genesis block?
amit kumar
CC BY-SA 3.0
2016-01-05T07:23:46.437Z
Thanks, I got the solution https://bitcointalk.org/index.php?topic=391983.msg4223449#msg4223449
amit kumar
CC BY-SA 3.0
2018-02-13T08:13:51.853Z
at newest source bitcoin 0.15.1, debug.log file does not be generated? Why?
creator
CC BY-SA 3.0
2018-02-13T16:41:34.087Z
@leegod: If you have a new question, please start another topic
Murch
CC BY-SA 3.0
2018-02-23T01:39:03.600Z
Hi. So even if after change hash value to match, but still another occured, 

ERROR: ReadBlockFromDisk: Errors in block header at CBlockDiskPos(nFile=0, nPos=8)

I posted this forum, replier says 

"Your genesis block is wrong. You actually have to mine the block, not just change the parameters."

but, how to? I searched a lot but most code mine the block is outdated, and not work at currently. Do you know this solution? Thanks.
creator
CC BY-SA 3.0
2016-01-04T10:14:51.917Z
2016-01-04T12:09:08.707Z
2016-01-04T12:09:08.707Z
Murch
<p>I am trying to create a genesis block in twister-core using Ubuntu and IDE Qt Creator. I have compiled the twister-core successfully, I have changed the these parameters for creating the genesis block <code>pszTimestamp</code>, <code>genesis.nTime</code>   and  <code>genesis.nNonce</code>. Then I re-compiled it successfully. When I am executing <code>twisterd</code> in the terminal using this command </p>

<pre><code>./twisterd -rpcuser=user -rpcpassword=pwd -rpcallowip=127.0.0.1
</code></pre>

<p>this error occured:</p>

<blockquote>
  <p>Terminal Error :<br>
  Assertion `hashGenesisBlock == uint256("b24b7a9c568b4ae288c0be34699c4c79fc22848e7c346afd5f63901e41ed8640")' failed.
  Aborted (core dumped)</p>
</blockquote>

<p>When I run it On Qt-Creator same error occur Error:</p>

<blockquote>
  <p>twisterd: ../twister/src/chainparams.cpp:216: CMainParams::CMainParams(): Assertion `hashGenesisBlock == uint256("b24b7a9c568b4ae288c0be34699c4c79fc22848e7c346afd5f63901e41ed8640")' failed.<br>
  The program has unexpectedly finished.<br>
  ../twister-qt-Output/twisterd exited with code 0</p>
</blockquote>

<p>Please help me to resolve this problem.</p>

CC BY-SA 3.0
2016-01-04T10:21:40.257Z
possible duplicate of [How can I create a new Genesis Block?](http://bitcoin.stackexchange.com/q/21303/5406)
Murch
<bitcoin-core-development><genesis-block><altcoin-development>
Problem In Creating Genesis Block Twister-Core using Ubuntu and (Qt Creator IDE)
amit kumar
# Problem In Creating Genesis Block Twister-Core using Ubuntu and (Qt Creator IDE)

(Asked by: username_0 on 2016-01-04)

I am trying to create a genesis block in twister-core using Ubuntu and IDE Qt username_2. I have compiled the twister-core successfully, I have changed the these parameters for creating the genesis block `pszTimestamp`, `genesis.nTime` and `genesis.nNonce`. Then I re-compiled it successfully. When I am executing `twisterd` in the terminal using this command

```
./twisterd -rpcuser=user -rpcpassword=pwd -rpcallowip=127.0.0.1

```

this error occured:

> Terminal Error :  
> Assertion `hashGenesisBlock == uint256("b24b7a9c568b4ae288c0be34699c4c79fc22848e7c346afd5f63901e41ed8640")' failed.
> Aborted (core dumped)

When I run it On Qt-username_2 same error occur Error:

> twisterd: ../twister/src/chainparams.cpp:216: CMainParams::CMainParams(): Assertion `hashGenesisBlock == uint256("b24b7a9c568b4ae288c0be34699c4c79fc22848e7c346afd5f63901e41ed8640")' failed.  
> The program has unexpectedly finished.  
> ../twister-qt-Output/twisterd exited with code 0

Please help me to resolve this problem.

**Tags:** bitcoin-core-development, genesis-block, altcoin-development

> **Comments:**
> **username_1**: possible duplicate of [How can I create a new Genesis Block?](http://bitcoin.stackexchange.com/q/21303/5406)  

---

## 1 answers

### Answer by username_1 on 2016-01-04. Score: 2 | Accepted answer

`chainparams.cpp` contains a line of code that checks whether the chain’s genesis block is equal to a specified hash. Since you created a new genesis block, you will have to update the value to your own hash.

You can see an example for the line here:

```
 hashGenesisBlock = genesis.GetHash();
 assert(hashGenesisBlock == uint256("9915158279673d101912be80f25c20627f1dd8bf5231e7c46bfec5ed19737f44"));

```

Which I took from [miguelfreitas/twister-core/…/chainparams.cpp](https://github.com/miguelfreitas/twister-core/blob/master/src/chainparams.cpp#L216)

To figure out what to put there, you can print `genesis.GetHash()` and replace the old hash in the assertion.

To print it the hash of the genesis block, you can use

```
printf("genesis.GetHash = %s\n", genesis.GetHash().ToString().c_str());

```

just above the line with the assertion, which will write to the `~/.bitcoin/debug.log`.

> **Comments:**
> **username_0**: Hi , I ave also printed the genesis.hashMerkleRoot using above example ,Please tell me where I put these hash to create genesis block?  
> **username_0**: Thanks, I got the solution https://bitcointalk.org/index.php?topic=391983.msg4223449#msg4223449  
> **username_2**: at newest source bitcoin 0.15.1, debug.log file does not be generated? Why?  
> **username_1**: @leegod: If you have a new question, please start another topic  
> **username_2**: Hi. So even if after change hash value to match, but still another occured,   ERROR: ReadBlockFromDisk: Errors in block header at CBlockDiskPos(nFile=0, nPos=8)  I posted this forum, replier says   "Your genesis block is wrong. You actually have to mine the block, not just change the parameters."  but, how to? I searched a lot but most code mine the block is outdated, and not work at currently. Do you know this solution? Thanks.  

---

