Bitcoinのコードをまとめるためだけのページ

###随時更新ページ

![usagoldcoins.jpg](https://qiita-image-store.s3.amazonaws.com/0/133062/3365ea8c-9f53-a4aa-a8d2-d0fa1863834f.jpeg)
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このページはbitcoinのソースコードを分野ごとに分けてわかりやすくする目的の元に存在します。
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Satoshi Nakamotoの初期ビットコインソースコード。
https://github.com/bitcoin/bitcoin/tree/4405b78d6059e536c36974088a8ed4d9f0f29898

他はbitcoinCoreから
https://github.com/bitcoin/bitcoin

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#SHA256
SHA256について
https://en.bitcoin.it/wiki/SHA-256
<br>
SHA256 - 初期ビット

```cpp
:sha.h

// implements the SHA-256 standard
class SHA256
{
public:
    typedef word32 HashWordType;
    static void InitState(word32 *state);
    static void Transform(word32 *digest, const word32 *data);
    static const char * StaticAlgorithmName() {return "SHA-256";}
};

```

<br>
SHA256 - bitcoin branch 0.8


```cpp
:base58.py
import hashlib

# for compatibility with following code...
class SHA256:
    new = hashlib.sha256

if str != bytes:
    # Python 3.x
    def ord(c):
        return c
    def chr(n):
        return bytes( (n,) )

__b58chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
__b58base = len(__b58chars)
b58chars = __b58chars
```
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#Base58
Base58について
http://chimera.labs.oreilly.com/books/1234000001802/ch04.html#public_key_derivation

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Base58 - 初期ビット
later
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Base58 -  bitcoin branch 0.8
later

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#Merkle Tree 
Merkle Treeについてhttps://bitcoin.org/en/glossary/merkle-tree
<br>
Merkle Treeで大事なのは最初のGenesis Block.これを基軸にブロックが今まで繋がってます。
<br>
Genesi Block - 初期ビット

```cpp
:main.cpp
        // Genesis Block:
        // GetHash()      = 0x000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f
        // hashMerkleRoot = 0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b
        // txNew.vin[0].scriptSig     = 486604799 4 0x736B6E616220726F662074756F6C69616220646E6F63657320666F206B6E697262206E6F20726F6C6C65636E61684320393030322F6E614A2F33302073656D695420656854
        // txNew.vout[0].nValue       = 5000000000
        // txNew.vout[0].scriptPubKey = 0x5F1DF16B2B704C8A578D0BBAF74D385CDE12C11EE50455F3C438EF4C3FBCF649B6DE611FEAE06279A60939E028A8D65C10B73071A6F16719274855FEB0FD8A6704 OP_CHECKSIG
        // block.nVersion = 1
        // block.nTime    = 1231006505
        // block.nBits    = 0x1d00ffff
        // block.nNonce   = 2083236893
        // CBlock(hash=000000000019d6, ver=1, hashPrevBlock=00000000000000, hashMerkleRoot=4a5e1e, nTime=1231006505, nBits=1d00ffff, nNonce=2083236893, vtx=1)
        //   CTransaction(hash=4a5e1e, ver=1, vin.size=1, vout.size=1, nLockTime=0)
        //     CTxIn(COutPoint(000000, -1), coinbase 04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73)
        //     CTxOut(nValue=50.00000000, scriptPubKey=0x5F1DF16B2B704C8A578D0B)
        //   vMerkleTree: 4a5e1e

        // Genesis block
        char* pszTimestamp = "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks";
        CTransaction txNew;
        txNew.vin.resize(1);
        txNew.vout.resize(1);
        txNew.vin[0].scriptSig     = CScript() << 486604799 << CBigNum(4) << vector<unsigned char>((unsigned char*)pszTimestamp, (unsigned char*)pszTimestamp + strlen(pszTimestamp));
        txNew.vout[0].nValue       = 50 * COIN;
        txNew.vout[0].scriptPubKey = CScript() << CBigNum("0x5F1DF16B2B704C8A578D0BBAF74D385CDE12C11EE50455F3C438EF4C3FBCF649B6DE611FEAE06279A60939E028A8D65C10B73071A6F16719274855FEB0FD8A6704") << OP_CHECKSIG;
        CBlock block;
        block.vtx.push_back(txNew);
        block.hashPrevBlock = 0;
        block.hashMerkleRoot = block.BuildMerkleTree();
        block.nVersion = 1;
        block.nTime    = 1231006505;
        block.nBits    = 0x1d00ffff;
        block.nNonce   = 2083236893;


```



構築編 - 初期ビット

```cpp
:main.cpp


int CMerkleTx::SetMerkleBranch(const CBlock* pblock)
{
    if (fClient)
    {
        if (hashBlock == 0)
            return 0;
    }
    else
    {
        CBlock blockTmp;
        if (pblock == NULL)
        {
            // Load the block this tx is in
            CTxIndex txindex;
            if (!CTxDB("r").ReadTxIndex(GetHash(), txindex))
                return 0;
            if (!blockTmp.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, true))
                return 0;
            pblock = &blockTmp;
        }

        // Update the tx's hashBlock
        hashBlock = pblock->GetHash();

        // Locate the transaction
        for (nIndex = 0; nIndex < pblock->vtx.size(); nIndex++)
            if (pblock->vtx[nIndex] == *(CTransaction*)this)
                break;
        if (nIndex == pblock->vtx.size())
        {
            vMerkleBranch.clear();
            nIndex = -1;
            printf("ERROR: SetMerkleBranch() : couldn't find tx in block\n");
            return 0;
        }

        // Fill in merkle branch
        vMerkleBranch = pblock->GetMerkleBranch(nIndex);
    }

    // Is the tx in a block that's in the main chain
    map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
    if (mi == mapBlockIndex.end())
        return 0;
    CBlockIndex* pindex = (*mi).second;
    if (!pindex || !pindex->IsInMainChain())
        return 0;

    return pindexBest->nHeight - pindex->nHeight + 1;
}

```

#ECDSA
これはopensslのライブラリからでした。　よかった。。。
(説明めっちゃ大変な案件なので)
https://en.wikipedia.org/wiki/Elliptic_Curve_Digital_Signature_Algorithm

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ECDSA - 初期ビット

```cpp
:headers.h
#include <openssl/ecdsa.h>
```
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