<p>I think you can use this : <a href="https://bitcointalk.org/index.php?topic=225690.0" rel="nofollow">https://bitcointalk.org/index.php?topic=225690.0</a>
This is all you need to make your altcoin working ;)</p>

<p>According to this link, you need to launch your alt coin's software and see in debug.log which hash your software is waiting for.</p>

CC BY-SA 3.0
2014-01-23T18:26:53.473Z
I know how to generate bitcoin genesis block,but primecoin and datacoin are different.They can't just change the time and hash code to make it run successfully.There must be something else to modify.
Gank
CC BY-SA 3.0
2014-01-21T23:51:57.127Z
2014-01-21T23:51:57.127Z
Nontenda
<p>I create my new altercoin,but when I first run it,it already shows:"No block source available 5 week(s) behind". 
And I start anther computer in the LAN, they link succefully.
I use the code of Datacoin.</p>

<pre><code>static const uint256 hashGenesisBlockOfficial("f9f6d9a689f7a4093c71f397d8fe3fbef3a05cd6f919d51b4a9447aa22743dfb");
static const uint256 hashGenesisBlockTestNet("f9f6d9a689f7a4093c71f397d8fe3fbef3a05cd6f919d51b4a9447aa22743dfb");

  // Genesis block
        qDebug()&lt;&lt;"Genesis block";
        const char* pszStartTopic = "The Times 26/Dec/2013 Chancellor on brink of second bailout for banks";//https://bitcointalk.org/index.php?topic=325735.0";
        CTransaction txNew;
        txNew.vin.resize(1);
        txNew.vout.resize(1);
        txNew.vin[0].scriptSig = CScript() &lt;&lt; 0 &lt;&lt; CBigNum(999) &lt;&lt; vector&lt;unsigned char&gt;((const unsigned char*)pszStartTopic, (const unsigned char*)pszStartTopic + strlen(pszStartTopic));
        txNew.vout[0].nValue = COIN;
        txNew.vout[0].scriptPubKey = CScript();
        CBlock block;
        block.vtx.push_back(txNew);
        block.hashPrevBlock = 0;
        block.hashMerkleRoot = block.BuildMerkleTree();
        block.nTime    = 1387977869 ;//http://www.unixtimestamp.com/index.php
        block.nBits    = TargetFromInt(6);
        block.nNonce   = 49030125;
        block.bnPrimeChainMultiplier = (uint64) 5651310;

        if (fTestNet)
        {
            block.nTime    = 1387977869 ;
            block.nBits    = TargetFromInt(4);
            block.nNonce   = 46032;
            block.bnPrimeChainMultiplier = (uint64) 211890;
        }

        //// debug print
        uint256 hash = block.GetHash();
        printf("%s\n", hash.ToString().c_str());

        qDebug()&lt;&lt;"hash:"&lt;&lt;hash.ToString().c_str();
        printf("%s\n", hashGenesisBlock.ToString().c_str());
        qDebug()&lt;&lt;"hashGenesisBlock:"&lt;&lt;hashGenesisBlock.ToString().c_str();
        printf("%s\n", block.hashMerkleRoot.ToString().c_str());
         qDebug()&lt;&lt;"block.hashMerkleRoot:"&lt;&lt;block.hashMerkleRoot.ToString().c_str();
        assert(block.hashMerkleRoot == uint256("a0c44c1b6dd50fcaa2bc1c4d7f8ca406506caee88578d751fb3824b41bc34d84"));
        block.print();

        assert(hash == hashGenesisBlock);
        {
            CValidationState state;
            assert(block.CheckBlock(state, true, true));
            assert(CheckProofOfWork(block.GetHeaderHash(), block.nBits, block.bnPrimeChainMultiplier, block.nPrimeChainType, block.nPrimeChainLength));
        }
</code></pre>

<p>Failed at <em>assert(CheckProofOfWork(block.GetHeaderHash(), block.nBits, block.bnPrimeChainMultiplier, block.nPrimeChainType, block.nPrimeChainLength));</em>.
And the debug.log says:</p>

<pre><code>    CBlock(hash=f9f6d9a689f7a4093c71f397d8fe3fbef3a05cd6f919d51b4a9447aa22743dfb, hashBlockHeader=7d6aeeb7ca2b87d2f48bbd7a675c8374691c4f44f0db1a10de66436bfbcb0188, ver=2, hashPrevBlock=0000000000000000000000000000000000000000000000000000000000000000, hashMerkleRoot=a0c44c1b6dd50fcaa2bc1c4d7f8ca406506caee88578d751fb3824b41bc34d84, nTime=1387977869, nBits=06000000, nNonce=49030125, vtx=1)
      CTransaction(hash=a0c44c1b6dd50fcaa2bc1c4d7f8ca406506caee88578d751fb3824b41bc34d84, ver=1, vin.size=1, vout.size=1, nLockTime=0, data.size=0)
        CTxIn(COutPoint(0000000000000000000000000000000000000000000000000000000000000000, 4294967295), coinbase 0002e703455468652054696d65732032362f4465632f32303133204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73)
        CTxOut(error)
ERROR: CheckPrimeProofOfWork() : block header hash under limit
ERROR: CheckProofOfWork() : check failed for prime proof-of-work
</code></pre>

<p>Anything else can I change to make the genesis block work?</p>

CC BY-SA 3.0
2017-08-02T23:10:56.087Z
I know this is kind of digging the past. But, Were you able to find the solution?
Kannan Ravindran
<bitcoind><genesis-block>
How to make a genesis block of my altercoin?
Gank
# How to make a genesis block of my altercoin?

(Asked by: username_0 on 2013-12-25)

I create my new altercoin,but when I first run it,it already shows:"No block source available 5 week(s) behind".
And I start anther computer in the LAN, they link succefully.
I use the code of Datacoin.

```
static const uint256 hashGenesisBlockOfficial("f9f6d9a689f7a4093c71f397d8fe3fbef3a05cd6f919d51b4a9447aa22743dfb");
static const uint256 hashGenesisBlockTestNet("f9f6d9a689f7a4093c71f397d8fe3fbef3a05cd6f919d51b4a9447aa22743dfb");

  // Genesis block
        qDebug()<<"Genesis block";
        const char* pszStartTopic = "The Times 26/Dec/2013 Chancellor on brink of second bailout for banks";//https://bitcointalk.org/index.php?topic=325735.0";
        CTransaction txNew;
        txNew.vin.resize(1);
        txNew.vout.resize(1);
        txNew.vin[0].scriptSig = CScript() << 0 << CBigNum(999) << vector<unsigned char>((const unsigned char*)pszStartTopic, (const unsigned char*)pszStartTopic + strlen(pszStartTopic));
        txNew.vout[0].nValue = COIN;
        txNew.vout[0].scriptPubKey = CScript();
        CBlock block;
        block.vtx.push_back(txNew);
        block.hashPrevBlock = 0;
        block.hashMerkleRoot = block.BuildMerkleTree();
        block.nTime    = 1387977869 ;//http://www.unixtimestamp.com/index.php
        block.nBits    = TargetFromInt(6);
        block.nNonce   = 49030125;
        block.bnPrimeChainMultiplier = (uint64) 5651310;

        if (fTestNet)
        {
            block.nTime    = 1387977869 ;
            block.nBits    = TargetFromInt(4);
            block.nNonce   = 46032;
            block.bnPrimeChainMultiplier = (uint64) 211890;
        }

        //// debug print
        uint256 hash = block.GetHash();
        printf("%s\n", hash.ToString().c_str());

        qDebug()<<"hash:"<<hash.ToString().c_str();
        printf("%s\n", hashGenesisBlock.ToString().c_str());
        qDebug()<<"hashGenesisBlock:"<<hashGenesisBlock.ToString().c_str();
        printf("%s\n", block.hashMerkleRoot.ToString().c_str());
         qDebug()<<"block.hashMerkleRoot:"<<block.hashMerkleRoot.ToString().c_str();
        assert(block.hashMerkleRoot == uint256("a0c44c1b6dd50fcaa2bc1c4d7f8ca406506caee88578d751fb3824b41bc34d84"));
        block.print();

        assert(hash == hashGenesisBlock);
        {
            CValidationState state;
            assert(block.CheckBlock(state, true, true));
            assert(CheckProofOfWork(block.GetHeaderHash(), block.nBits, block.bnPrimeChainMultiplier, block.nPrimeChainType, block.nPrimeChainLength));
        }

```

Failed at *assert(CheckProofOfWork(block.GetHeaderHash(), block.nBits, block.bnPrimeChainMultiplier, block.nPrimeChainType, block.nPrimeChainLength));*.
And the debug.log says:

```
    CBlock(hash=f9f6d9a689f7a4093c71f397d8fe3fbef3a05cd6f919d51b4a9447aa22743dfb, hashBlockHeader=7d6aeeb7ca2b87d2f48bbd7a675c8374691c4f44f0db1a10de66436bfbcb0188, ver=2, hashPrevBlock=0000000000000000000000000000000000000000000000000000000000000000, hashMerkleRoot=a0c44c1b6dd50fcaa2bc1c4d7f8ca406506caee88578d751fb3824b41bc34d84, nTime=1387977869, nBits=06000000, nNonce=49030125, vtx=1)
      CTransaction(hash=a0c44c1b6dd50fcaa2bc1c4d7f8ca406506caee88578d751fb3824b41bc34d84, ver=1, vin.size=1, vout.size=1, nLockTime=0, data.size=0)
        CTxIn(COutPoint(0000000000000000000000000000000000000000000000000000000000000000, 4294967295), coinbase 0002e703455468652054696d65732032362f4465632f32303133204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73)
        CTxOut(error)
ERROR: CheckPrimeProofOfWork() : block header hash under limit
ERROR: CheckProofOfWork() : check failed for prime proof-of-work

```

Anything else can I change to make the genesis block work?

**Tags:** bitcoind, genesis-block

> **Comments:**
> **username_1**: I know this is kind of digging the past. But, Were you able to find the solution?  

---

## 1 answers

### Answer by username_2 on 2014-01-21. Score: 0 | Accepted answer

I think you can use this : <https://bitcointalk.org/index.php?topic=225690.0>
This is all you need to make your altcoin working ;)

According to this link, you need to launch your alt coin's software and see in debug.log which hash your software is waiting for.

> **Comments:**
> **username_0**: I know how to generate bitcoin genesis block,but primecoin and datacoin are different.They can't just change the time and hash code to make it run successfully.There must be something else to modify.  

---

