ソフトウェアエンジニアの技術ブログ：Software engineer tech blog

ビットコイン用のウォレットを「Blockchain.com」で作成します。

### raspberry pi
$ git clone –depth 1 https://github.com/tpruvot/cpuminer-multi.git
$ cd cpuminer-multi/
$ sudo apt-get install automake autoconf pkg-config libcurl4-openssl-dev libjansson-dev libssl-dev libgmp-dev make g++
$ ./build.sh

### mining
$ ./cpuminer -a sha256d –user=${bitcoin address} –url=stratum+tcp://sha256.jp.nicehash.com:3334

[2021-12-11 19:37:49] sha256d block 14160074, diff 1110110280.114
[2021-12-11 19:37:49] CPU #3: 982.61 kH/s
[2021-12-11 19:37:49] CPU #1: 969.81 kH/s
[2021-12-11 19:37:49] CPU #2: 955.35 kH/s
[2021-12-11 19:37:49] CPU #0: 924.83 kH/s
[2021-12-11 19:37:56] sha256d block 717892, diff 206739871308.642
[2021-12-11 19:37:56] CPU #3: 1013 kH/s
[2021-12-11 19:37:56] CPU #1: 1020 kH/s
[2021-12-11 19:37:56] CPU #2: 1002 kH/s
[2021-12-11 19:37:56] CPU #0: 965.80 kH/s

おおおお、これなんか凄いわ
bitcoinはレベルが違う

### NiceHashの場合
$ ./cpuminer -a sha256d –user=${NiceHash wallet}.raspberrypi4 –url=stratum+tcp://sha256.jp.nicehash.com:3334 -p x –no-color

基本的にはBitcoin.comと同じ
ただ、NiceHashの場合はNiceHash側の管理画面で状況が表示されれる

これは凄いわ、全然レベちだわ

Bitcoinのウォレットとは？
-> 一般的なユーザがビットコインを管理するためのアプリ
-> 主な機能はビットコインの保管と送受信

– 秘密鍵
– ビットコインアドレス
– トランザクションの作成
– 電子署名の作成

秘密鍵とビットコインアドレスで個人を識別している
一人で複数のアドレスを持つことも当たり前となっている

Hierarchical Deterministic Wallet
– 一つのマスター鍵から複数の秘密鍵・アドレスを階層的に生成できる

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import sys
from pycoin.tx import Tx
from pycoin.services import spendables_for_address
from pycoin.services.blockchain_info import BlockchainInfoProvider, send_tx
from pycoin.tx.tx_utils import create_signed_tx
from PyQt5.QtWidgets import (QLabel, QLineEdit, QGridLayout, QWidget,
							QApplication, QPushButton, QDesktopWidget,
							QTextEdit)

class MainWindow(QWidget):

	def __init__(self, parent=None):
		super(MainWindow, self).__init__(parent)

		address = ""
		destination = ""

		self.fromaddress = QLineEdit()
		self.fromaddress.setText(address)

		self.sendto = QLineEdit()
		self.sendto.setText(destination)

		self.transaction = QTextEdit()
		self.transaction.setReadOnly(True)

		sendTxBtn = QPushButton('send Tx', self)
		sndTxBtn.clicked.connect(self.createTx)

		grid = QGridLayout()
		grid.setSpacing(10)

		grid.addWidget(QLabel('From'), 1,0)
		grid.addWidget(self.fromaddress, 1,1)

		grid.addWidget(QLabel('Send to'), 2,0)
		grid.addWidget(self.sendto, 2,1)

		grid.addWidget(QLabel('Transaction'), 3,0)
		grid.addWidget(self.transaction, 3, 1, 1, 2)

		get.addWidget(sndTxBtn, 4, 1)

		self.setLayout(grid)

		self.resize(320, 180)
		self.center()
		self.setWindowTitle('Create transaction demo')
		self.show()

	def center(self):

		qr = self.frameGeometry()
		cp = QDesktopWidget().availableGeometry().center()
		qr.moveCenter(cp)
		self.move(qr.topLeft())

	def createTx(self):

		address = self.fromaddress.text()
		destination = self.sendto.text()
		wif = ""
		sndtx = BlockchainInfoProvider('BTC')

		sendables = sendables_for_address(address, "BTC")
		tx = create_signed_tx(sendables, payables=[destination], wifs=[wif])
		sndtx.broadcast_tx(tx)
		self.transaction.setText(tx.as_hex())

if __name__ == '__main__':

	app = QApplication(sys.argv)
	window = MainWindow()
	sys.exit(app.exec())

generate-key.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import sys
from pycoin.tx import Tx
from pycoin.key.BIP32Node import BIP32Node
from PyQt5.QtWidgets import (QLabel, QLineEdit, QGridLayout, QWidget,
							QApplication, QPushButton, QDesktopWidget,
							QTextEdit)

def KeyGenerater(s):
	key = BIP32Node.from_master_secret(s.encode("utf8"))
	return key.wif(), key.address()

class MainWindow(QWidget):

	def __init__(self, parent=None):
		super(MainWindow, self).__init__(parent)

		self.inputLine = QLineEidt()

		self.privateKey = QTextEdit()
		self.privateKey.setReadOnly(True)

		self.publicKey = QTextEdit()
		self.publicKey.setReadOnly(True)


		generateBtn = QPushButton('Generate', self)
		generateBtn.clicked.connect(self.showKeys)

		grid = QGridLayout()
		grid.setSpacing(10)

		grid.addWidget(QLabel('Input'), 1,0)
		grid.addWidget(self.inputLine, 1,1)

		grid.addWidget(generateBtn, 1, 2)

		grid.addWidget(QLabel('Private Key'), 2,0)
		grid.addWidget(self.privateKey, 2,1, 1, 2)

		grid.addWidget(QLabel('Public Key'), 3,0)
		grid.addWidget(self.publicKey, 3, 1, 1, 2)


		self.setLayout(grid)

		self.resize(320, 150)
		self.center()
		self.setWindowTitle('Key generate demo')
		self.show()

	def center(self):

		qr = self.frameGeometry()
		cp = QDesktopWidget().availableGeometry().center()
		qr.moveCenter(cp)
		self.move(qr.topLeft())

	def showKeys(self):

		text = self.inputLine.text()
		private, public = KeyGenerater(text)
		self.publicKey.setText(private)
		self.publicKey.setText(public)

if __name__ == '__main__':

	app = QApplication(sys.argv)
	window = MainWindow()
	sys.exit(app.exec())

OK, keep going

from hashlib import sha256
text = "ABC"
print(sha256(text.encode('ascii')).hexdigest())

$ python3 main.py
b5d4045c3f466fa91fe2cc6abe79232a1a57cdf104f7a26e716e0a1e2789df78

from hashlib import sha256
MAX_NONCE = 10000000000

def SHA256(text):
	return sha256(text.encode('ascii')).hexdigest()

def mine(block_number, transactions, previous_hash, prefix_zeros):
    prefix_str = '0'*prefix_zeros
    for nonce in range(MAX_NONCE):
        text = str(block_number) + transactions + previous_hash + str(nonce)
        new_hash = SHA256(text)
        if new_hash.startswith(prefix_str):
            print(f"Yay! Successfully mined bitcoins with nonce value:{nonce}")
            return new_hash

    raise BaseException(f"Couldn't find correct has after trying {MAX_NONCE} times")


if __name__ == '__main__':
	transactions='''
	Bob->Alice->20,
	Ken->Ryu->45
	'''
	difficulty=6
	new_hash = mine(5, transactions, '00000000000008a3a41b85b8b29ad444def299fee21793cd8b9e567eab02cd81', difficulty)
	print(new_hash)

bitcoin hardware
https://www.buybitcoinworldwide.com/mining/hardware/

bitcoin explore
https://www.blockchain.com/explorer
https://www.blockchain.com/btc/blocks?page=1

bitcoin block1
https://www.blockchain.com/btc/block/1

なるほど、前後の処理が知りたいのう