比特币源代码阅读笔记-创世块的产生
源码文件名:chainparams.cpp
100
class CMainParams:
public CChainParams{
101
public:
102 CMainParams(){
103
// The message start string is designed tobe unlikely to occur in normal data.
104
// The characters are rarely used upperASCII, not valid as UTF-8, and produce
105
// a large 4-byte int at anyalignment.
106 pchMessageStart[0] = 0xf9;
107 pchMessageStart[1] = 0xbe;
108 pchMessageStart[2] = 0xb4;
109 pchMessageStart[3] = 0xd9;
110 vAlertPubKey = ParseHex(
"04fc9702847840aaf195de8442ebecedf5b095cdbb9bc716bda9110971b28a49e0ead8564ff0db22209e0374782c093bb899692d524e9d6a6956e7c5ecbcd68284");
111 nDefaultPort = 8333;
112 nRPCPort = 8332;
113 bnProofOfWorkLimit = ~ uint256(0)>> 32; //这个位置,是设置最小难度的限制,uint256是一个封装类,经常用来存储hash值之类的大数据.256位,64字节. 将它右移32位, 实际上就是前面4字节是0的一个64位值.16进制是0x00000000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
114 nSubsidyHalvingInterval =210000;
115
116
// Build the genesis block. Note that theoutput of the genesis coinbase cannot
117
// be spent as it did not originally existin the database.
118
//
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// CBlock(hash=000000000019d6, ver=1,hashPrevBlock=00000000000000, hashMerkleRoot=4a5e1e,nTime=1231006505, nBits=1d00ffff, nNonce=2083236893,vtx=1)
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// CTransaction(hash=4a5e1e, ver=1,vin.size=1, vout.size=1, nLockTime=0)
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// CTxIn(COutPoint(000000, -1), coinbase04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73)
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// CTxOut(nValue=50.00000000,scriptPubKey=0x5F1DF16B2B704C8A578D0B)
123
// vMerkleTree: 4a5e1e
124
const
char* pszTimestamp =
"TheTimes 03/Jan/2009 Chancellor on brink of second bailout forbanks";
125 CTransactiontxNew;
126 txNew. vin.resize(1);
127 txNew. vout.resize(1);
128 txNew. vin[0].scriptSig= CScript()<< 486604799 << CScriptNum(4)<< vector((
const
unsigned
char*)pszTimestamp, (
const
unsigned
char*)pszTimestamp +strlen(pszTimestamp));
129 txNew. vout[0].nValue= 50 * COIN;
130 txNew. vout[0].scriptPubKey= CScript()<< ParseHex(
"04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f")<< OP_CHECKSIG;
//这段代码创建一个交易, pszTimestamp 是coinbase 的文字,作者用2009年1月3日在报纸上的一个标题写在这里,为的是证明这个创世块的产生迟于2009年1月3日,以表明在这之前,作者没有预挖比特币.很聪明的做法.
131 genesis.vtx.push_back(txNew);
132 genesis.hashPrevBlock = 0;
133 genesis.hashMerkleRoot =genesis.BuildMerkleTree();
134 genesis.nVersion = 1;
135 genesis.nTime =1231006505;//这个时间,就是unix时间,从1970年1月1日到2009年1月3日之间的秒数.unix系统常常用这种整数表达时间.
136 genesis.nBits = 0x1d00ffff;//这个是难度
137 genesis.nNonce =2083236893;//这个不是随机数字,挖矿的过程,就是寻找这个数字,来使得区块的HASH值小于genesis.nBits所指定的难度.genesis.nNonce是参与hash运算的源数据的一部份.所以,修改这个值,整个hash值就会发生改变.
138
139 hashGenesisBlock =genesis.GetHash();//计算区块的hash值
140 assert(hashGenesisBlock == uint256(
"0x000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"));//这段代码是检验hash值是不是正确.
141 assert(genesis.hashMerkleRoot == uint256(
"0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"));
142
143 vSeeds.push_back( CDNSSeedData(
"bitcoin.sipa.be",
"seed.bitcoin.sipa.be"));
144 vSeeds.push_back( CDNSSeedData(
"bluematt.me",
"dnsseed.bluematt.me"));
145 vSeeds.push_back( CDNSSeedData(
"dashjr.org",
"dnsseed.bitcoin.dashjr.org"));
146 vSeeds.push_back( CDNSSeedData(
"bitcoinstats.com",
"seed.bitcoinstats.com"));
147 vSeeds.push_back( CDNSSeedData(
"bitnodes.io",
"seed.bitnodes.io"));
148 vSeeds.push_back( CDNSSeedData(
"xf2.org",
"bitseed.xf2.org"));
149
150 base58Prefixes[PUBKEY_ADDRESS] =list_of(0);
151 base58Prefixes[SCRIPT_ADDRESS] =list_of(5);
152 base58Prefixes[SECRET_KEY] =list_of(128);
153 base58Prefixes[EXT_PUBLIC_KEY] =list_of(0x04)(0x88)(0xB2)(0x1E);
154 base58Prefixes[EXT_SECRET_KEY] =list_of(0x04)(0x88)(0xAD)(0xE4);
155
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// Convert the pnSeeds array into usableaddress objects.
157
for (
unsigned
int i = 0; i< ARRAYLEN( pnSeed);i++)
158 {
159
// It'll only connect to one or two seednodes because once it connects,
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// it'll get a pile of addresses withnewer timestamps.
161
// Seed nodes are given a random 'lastseen time' of between one and two
162
// weeks ago.
163
const int64_t nOneWeek =7*24*60*60;
164
struct in_addr ip;
165 memcpy(&ip,& pnSeed[i],
sizeof(ip));
166 CAddressaddr( CService(ip,GetDefaultPort()));
167 addr. nTime= GetTime() - GetRand(nOneWeek)- nOneWeek;
168 vFixedSeeds.push_back(addr);
169 }
170 }
171
172
virtual
const CBlock& GenesisBlock()
const {
return genesis; }
173
virtual Network NetworkID()
const {
return CChainParams::MAIN;}
174
175
virtual
const vector& FixedSeeds()
const{
176
return vFixedSeeds;
177 }
178
protected:
179 CBlock genesis;
180 vector vFixedSeeds;
181 };
因为我要创建新的货币,所以,尝试创建自己的创世区
代码如下:
const char*pszTimestamp = "2014/5/11 Write by Andy,Email:[email protected]";//我的创世区块 CTransaction txNew; txNew.vin.resize(1);txNew.vout.resize(1); txNew.vin[0].scriptSig = CScript() <<486604799 << CBigNum(4) << vector((const unsignedchar*)pszTimestamp, (const unsigned char*)pszTimestamp +strlen(pszTimestamp)); txNew.vout[0].nValue = 50 * COIN;txNew.vout[0].scriptPubKey = CScript() <//------寻找nNonce值代码结束//printf("hashGenesisBlock: %x\n",hashGenesisBlock); //printf("genesis.hashMerkleRoot: %x\n",genesis.hashMerkleRoot);//assert(hashGenesisBlock ==uint256("0x1a5299d469c5d424a999c82a05bb36b631cccb899b44cb16c46d5b03b50e696"));// assert(genesis.hashMerkleRoot ==uint256("0xa3bdc0d6741b0d1c3bcbca154f3deb84132fbfde9dfaa2f880e40ff3e3c38712"));