Generate bitcoin wallet address

Generate bitcoin wallet address

Hash SHA-256 «CoinAddressGeneratorV3.1.0.jar» = 5f5fa204b1d5505c3056a6432f39ad2628aff47ffcbc73494e566757bce08e60

The Coin-AddressGenerator creates a private key in Bitcoin Wallet Import Format WIF, as well as the associated coin address and public key. A paper wallet with QR code can be created and printed out.

This is a Java application, so you need to install Java!

Start the program

The «Coin_Address_Generator.jar» file is located in the «release» folder. You can start this under Windows if Java is installed simply by double-clicking. On Linux, type in the console: java -jar CoinAddressGeneratorV3.1.0.jar

The project was created with eclipse. You can either import it back into eclipse or use the java source files. All necessary source files are in the src folder. To import to eclipse go to File / Open Projects from File System, select the ZIP archive, finish! All required libraries are already included in the project (in the lib folder). So you can start the project directly.

There is a large list of coins to choose from that can be imported. However, some coins may not work properly because the coin parameter list is quickly out of date and cannot be kept up to date. It is the responsibility of each user to check that the keys created are correct! Use of this software is at your own risk!

There are three ways to create the private key:

Entry as text: Any text can be entered. This text then becomes the private key with a hash, Public key and the Bitcoin address generated.

cube sign:
There can be 100 dice characters in Base6 (also characters between 1 and 6). This includes: 1=1, 2=2, 3=3, 4=4, 5=5, 6=0.

The private key can also be entered directly in all common formats: Hexa, Base58, Base58 compressed and Base64. Checksum check is implemented.

• The format of the generated keys and addresses can be set under «Settings»
• the public key is given in hexa
• The coin address can be output in WIF-uncompressed, WIF-compressed, P2SH and Bech32
• The QR code of the private key and the coin address is displayed

Issue of the coin amount

• If the internet connection is active, the coin amount belonging to the key is displayed
• The amount is queried on a suitable website
• If no internet connection is available, nothing is displayed.

For safety, the program reads the QR code back in as an image, scanned and checked. This prevents an incorrect QR code from being displayed.

Save and open the wallet

An encrypted wallet with any number of keys can be saved. A strong password must be entered for this. To increase security, encryption is carried out in succession using AES and Twofish. In addition, the encryption contains a certain brute force protection, which extends the runtime with the help of a scrypt hash.

Create a paper wallet.

The surface of the program can be printed out or saved as an image.

If you find bugs, ideas for improvements, or just have questions, I am happy about every mail: Maxwell-KSP@gmx.de

If you like the Coin Address Generator, I would be very happy to receive a donation:

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS «AS IS» AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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Generate Bitcoin private key and Bitcoin address

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How to Generate Bitcoin Wallet Address in Java

Let’s work by learning how Bitcoin implements all aspects of the technology, OK? The technology includes the following aspects:

• Bitcoin address bitcoin address is used to send and receive bitcoin.
• Transaction is the transfer of bitcoins from one address to another.
• Several transactions are grouped into blocks. A block is processed, so it can be submitted to the Bitcoin network. This process is known asMining mining。
• Blocks are collected in block chains and shared by nodes in the network.

Warning Tips – The code here is for learning only. If you try to send bitcoins to addresses generated by the code, you may lose money.

What is the Bitcoin address?

Bitcoin address is a randomly searched hexadecimal string used to send and receive bitcoins in the Bitcoin network. It is public-private asymmetry. ECDSA The public part of the key. The corresponding private key is used to sign the Bitcoin transaction as confirmation and proof from you at the time of the transaction.

Technically, the Bitcoin address is from ECDSA Generated by the public part of the key, using SHA-256 and RIPEMD-160 Hash, as described below, to process the resulting hash, and finally use Base58 The key is encoded by the check code.

Let’s see how to use JCE (java encryption extension), Bouncy Castle (RIPEMD-160), and finally Base58 encoding in the bitcoinj library to do all this.

Generating ECDSA Key Pairs

We have described generating RSA public and private keys before. Bitcoin usage ECDSA replace RSA As a key algorithm. It is generated as follows:

by Elliptic Curve Algorithm creation KeyPairGenerator 。

Using the specified elliptic curve is secp256k1.

Once obtained KeyPairGenerator After that, you can create KeyPair That is, key pairs from which public and private keys can be obtained.

ECDSA private key

You can store only the private part of the key, because the public key can be derived from the private key.

Static method adjustTo64() Only hexadecimal strings with leading 0 are filled, so the total length is 64 characters.

This is the sample private key generated from the above code.

This value is usually stored in a digital wallet.

ECDSA public key

The public part of the key generated above is encoded as a bitcoin address. First, the ECDSA key is represented by points on the elliptic curve. The X and Y coordinates of the point include the public key. They are connected to “04” at the beginning to represent the public key.

Execute SHA-256 and RIPEMD-160 hashes

We now need to execute on the public key SHA-256 And then RIPEMD-160 。

We use Bouncy Castle Provider execution RIPEMD-160 Because JCE This algorithm was not implemented.

Next, we need to add a 0x00 version byte at the beginning of the hash.

Repeat SHA-256 hash twice

We now need to perform SHA-256 hash twice for the above results.

The first four bytes of the second hash result are used as address checksum. It’s attached to the above RIPEMD160 Hash. This is a 25 byte bitcoin address.

Coding addresses using Base58

We are using it now. bitcoinj In Library Base58.encode() Method to get the final bitcoin address.

This is the address where Bitcoin should be sent in the transaction.

This is a presentation on how to generate bitcoin addresses in java. We generate a ECDSA Key pairs, using SHA256 and RIPEMD160 The public part of the hash key. Finally, through implementation SHA256 Two times and select the first four bytes to calculate the checksum, which is appended to the above byte RIPEMD160 Hash. Result use Base58 Coding.

It’s a bit complicated. You can also see that this Java generates bitcoin addresses offline.

It is recommended that you browse our block chain tutorials and block chain technology blogs in various programming languages to gain a deeper understanding of block chains, bitcoins, encrypted currencies, Ethernet shops, and smart contracts.

• Java Bitcoin Development Course, which is for beginners, covers the core concepts of Bitcoin, such as block chain storage, decentralized consensus mechanism, key and script, transaction and UTXO. It also explains in detail how to integrate Bitcoin support functions in Java code, such as creating addresses, managing wallets, building bare transactions, etc. It is a rare comparison for Java engineers. Special currency development course.
• Php Bitcoin Development Course, for beginners, covers the core concepts of Bitcoin, such as block chain storage, decentralized consensus mechanism, key and script, transaction and UTXO. It also explains in detail how to integrate Bitcoin support functions in Php code, such as creating address, managing wallet, constructing bare transaction, etc., which are rare bits for Php engineers. Currency Development Course.

Huizhi original translation, reprinted please indicate the source. Here is the original text.

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BitAddress – генератор Биткоин кошельков с открытым кодом

Создание адреса происходит на стороне клиента. Выпускаемый кошелек в BitAddress поддерживает только криптовалюту Bitcoin.

Для начала работы необходимо перейти на официальный сайт БитАдрес (он доступен и на русском языке). Мы увидим процесс генерации Биткоин адреса.

Чтобы максимально увеличить фактор случайности при генерации ключа, необходимо поводить мышью по экрану, либо вводить произвольные текстовые символы в представленное поле. Это можно сделать и со смартфона, однако такой процесс займет около минуты.

В итоге BitAddress выдаёт 2 QR-кода. Слева «Share», который можно передавать другим людям для получения от них переводов. Справа «Secret», что нужно сохранить в надежном месте, ведь любой кто его получает, может всецело распоряжаться средствами на адресе.

Далее с помощью кнопки «Generate New Address» выпускается сколько угодно адресов. Но примите во внимание тот факт, что у каждого из них персональный «Secret» ключ.

Если вам нужен браузерный кошелёк для Биткоина с простой регистрацией, попробуйте лицензированную мультивалютную крипто-платформу «Кошелёк».

Как пополнить BitAddress и вывести биткоины?

На сайте невозможно просматривать баланс, отправлять или получать переводы. Он позволяет лишь сгенерировать приватный ключ, а дальше для его использования нужно найти отдельный клиент, и импортировать его туда.

«Paper Wallet» – бумажные биткоин кошельки

В БитАдресе можно создать и распечатать такие, причем с тонкой настройкой опций. Сюда входят: выбор количества адресов, количество их на странице для печати, включение или удаление оформления (чем-то напоминающего полноценный сертификат), и возможность дополнительного BIP38-шифрования с помощью пасс-фразы (пароля).

«Bulk Wallet» – массовая генерация

Десятки или сотни Bitcoin адресов создаются одним кликом, на выходе получаем удобный для импорта список. Сюда же входит и «Brain Wallet». Если понадобится выпустить лишь 1 надежный запароленный приватный ключ.

«Split Wallet»

Быстрое слияние нескольких адресов в 1. Что удобно для импорта, если сайт не поддерживает массовый.

Максимум деталей о кошельке – «Wallet Details»

Вводим ключ, в том числе пароль к нему, если он защищен, и просматриваем его во всех форматах.

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Генерируем Bitcoin-адрес на Python

Тема криптовалют снова начинает будоражить интернет. Супер, что вам не надо идти в отделение банка с паспортом и выстаивать очередь, чтобы открыть счет. Сгенерировать кошелек Bitcoin — дело нескольких строк кода на Python.

Нам понадобятся библиотеки base58 и ecdsa. base58 – это кодирование бинарных данных 58-ю печатными символами (цифрами и латинскими буквами, кроме 0, O, I, l, которые похожи друг на друга). ecdsa – библиотека криптографии на эллиптических кривых.

Импортируем то, что нужно:

Нам нужен приватный ключ, из него мы вычислим публичный ключ, а из него – адрес кошелька Bitcoin. (Обратная процедура не возможна без полного перебора до конца времен). Приватный ключ – это 32 байта данных, которые мы получим из криптографически-надежного источника случайных чисел. Вообще можно придумать свой приватный ключ самостоятельно, если так хочется. Для генерации случайного приватного ключа мы воспользуемся библиотекой ecdsa:

Вычислим этой же библиотекой публичный ключ и добавим спереди байт 0x4 (это признак «несжатого» публичного ключа; есть и другие форматы).

Теперь нужно из публичного ключа сделать привычный число-буквенный адрес Bitcoin. Взглянем на схему:

Для получения адреса из публичного ключа вычисляем сначала RIPEMD160(SHA256(public-key)):

Дополняем его префиксом 0x0 (главная сеть Bitcoin):

Вычисляем контрольную сумму (нужна, чтобы наши денюжки не пропадали, если мы ошибемся в каком-то символе адреса). Контрольная сумма это первые 4 байта от SHA256(SHA256(r)):

Получаем адрес кошелька, закодировав в base58 сложенные r и checksum:

Генерация приватного ключа из своего источника случайностей, например, os.urandom:

Важно для конфиденциальных данных, вроде приватного ключа, использовать криптографически безопасный источник случайности. Об этом я писал в одной из недавних статей!

Полный пример кода генерации кошельков.

Проверить ключи и адрес можно здесь. (Нажимаем Skip, дальше Enter my own…)

Подробнее по теме можно почитать здесь.

Специально для канала @pyway. Подписывайтесь на мой канал в Телеграм @pyway 👈

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How to Generate a Bitcoin Address — Step by Step

Here is a bash script that does what is outlined below: https://bit.ly/2MIgeOD

Introduction

This is a hands-on, technical guide about the generation of Bitcoin addresses including private and public keys, and the cryptography involved.

Learn more and join people in 22 countries around the world in my course on how to Become a Bitcoin + Blockchain Programmer.

This guide will walk you through all the steps to generate a Bitcoin address using the command line on a Mac. Similar steps should be possible on other operating systems using similar cryptographic tools. Lines starting with $ denote terminal commands, which you can type and run (without the $ of course).

Dependencies

• brew — Installation: https://brew.sh/
• pip — Installation: sudo easy_install pip
• libressl — Installation: brew install libressl
• base58 — Installation: pip install base58

Note: To do the contained openssl cli commands, I installed libressl in order for some of the elliptic curve commands to work as the current version of openssl cli on mac has a bug.

Cryptography Primer

Public Key Cryptography

Or asymmetric cryptography, is a type of cryptography that uses key pairs, each of which is unique. The pair of keys includes a public key and a private key. This is the type of cryptography that Bitcoin uses to control funds. A public key can be generated from a private key, but not vice-versa (computationally too difficult). Also, something encrypted with a private key can be decrypted with the public key, and vice-versa, hence they are asymmetric.

• Encryption: When a user has a public key, a message can be encrypted using a public key, which can only be read by the person with the private key. This also works in reverse.
• Digital Signatures: A user can, with their private key and a hash of some data, use a digital signature algorithm such as ECDSA, to calculate a digital signature. Then, another user can use the algorithm to verify that signature using the public key and the hash of the same data. If it passes, this proves a user did in fact submit a specific message, which has not been tampered with.
• Digital Fingerprint: Is a way to represent an arbitrarily large data set by computing the hash of it to generate a fingerprint of a standard size. This fingerprint would be so difficult to replicate without the same exact data, which can be assumed to have not been tampered with.

Private keys are what prove you can send Bitcoin that has been sent to you. It is like the password to your bank account. If you lose it or someone else gets a hold of it, you’re toast.

Public keys help people know how to send you Bitcoin.

Creating a Bitcoin Address

Private Key Generation

Private keys can be any 256 bit (32 byte) value from 0x1 to 0xFFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF BAAE DCE6 AF48 A03B BFD2 5E8C D036 4140 .¹

The total possible number of private keys is therefore 2²⁵⁶ or 1.16 x 10⁷⁷. Imagine the total number of atoms in your body, then imagine that each of those atoms is an earth. The total number of atoms on all of those earths is about 7 x 10⁷⁷.² There is virtually no chance that your random private key will ever be generated randomly or found by someone else.

A common (but not the most secure) way of creating a private key is to start with a seed, such as a group of words or passphrases picked at random. This seed is then passed through the SHA256 algorithm, which will always conveniently generate a 256 bit value. This is possible because every computer character is represented by an integer value (see ASCII and Unicode).

Note: SHA256 is a one-way, deterministic function meaning that it is easy to compute in one direction, but you cannot reverse it. In order to find a specific output, you have to try all the possible inputs until you get the desired output (brute forcing) and it will always produce the same output given the same input, respectively.

The seed can be used to generate the same private key if the same hashing algorithm is used in the future, so it is only necessary to save the seed.

This private key is in hexadecimal or base 16. Every 2 digits represents 8 bits or 1 byte. So, with 64 characters, there are 256 bits total.

Public Key Generation

Public keys are generated from the private keys in Bitcoin using elliptic curve ( secp256k1 ) multiplication using the formula K = k * G , where K is the public key, k is the private key, and G is a constant called the Generator Point⁴, which for secp256k1 is equal to:

It doesn’t seem to be known how this point was chosen by they designers of the curve. Also, this algorithm is a one-way algorithm, or a “trap door” function so that a private key cannot be derived from the public key. It is important to note that elliptic curve multiplication is not the same as scalar multiplication, though it does share similar properties.

To do this in the terminal from our private key earlier,

This public key contains a prefix 0x04 and the x and y coordinates on the elliptic curve secp256k1 , respectively.

Compressed Public Key

Most wallets and nodes implement compressed public key as a default format because it is half as big as an uncompressed key, saving blockchain space. To convert from an uncompressed public key to a compressed public key, you can omit the y value because the y value can be solved for using the equation of the elliptic curve: y² = x³ + 7. Since the equation solves for y², the right side of the equation could be either positive or negative. So, 0x02 is prepended for positive y values, and 0x03 is prepended for negative ones. If the last binary digit of the y coordinate is 0, then the number is even, which corresponds to positive. If it is 1, then it is negative. The compressed version of the public key becomes:

The prefix is 0x02 because the y coordinate ends in 0xa4 , which is even, therefore positive.

Address Generation

There are multiple Bitcoin address types, currently P2SH or pay-to-script hash is the default for most wallets. P2PKH was the predecessor and stands for Pay to Public Key Hash. Scripts give you more functionality, which is one reason why they are more popular. We’ll first generate a P2PKH original format address, followed by the now standard P2SH .

The public key from the previous output is hashed first using sha256 and then hashed using ripemd160 . This shortens the number of output bytes and ensures that in case there is some unforeseen relationship between elliptic curve and sha256, another unrelated hash function would significantly increase the difficulty of reversing the operation:

Note that since the input is a string, the xxd -r -p will convert the hex string into binary and then output it in hexdump style (ascii), which is what the openssl hashing functions expect as input.

Now that we have hashed the public key, we now perform base58check encoding. Base58check allows the hash to be displayed in a more compact way (using more letters of the alphabet) while avoiding characters that could be confused with each other such as 0 and O where a typo could result in your losing your funds. A checksum is applied to make sure the address was transmitted correctly without any data corruption such as mistyping the address.

Bitcoin P2PKH addresses begin with the version byte value 0x00 denoting the address type and end with a 4 byte checksum. First we prepend the version byte (prefix) to our public key hash and calculate and append the checksum before we encode it using base58 :

Note: -c denotes a checksum is to be applied. The checksum is calculated as checksum = SHA256(SHA256(prefix+data)) and only the first 4 bytes of the hash are appended to the end of the data.

The resulting value is a P2PKH address that can be used to receive Bitcoin: 16JrGhLx5bcBSA34kew9V6Mufa4aXhFe9X

Pay-to-Script Hash

The new default address type is a pay-to-script-hash, where instead of paying to a pubKey hash, it is a script hash. Bitcoin has a scripting language, you can read more about it here. Basically it allows for things like multiple signature requirements to send Bitcoin or a time delay before you are allowed to send funds, etc. A commonly used script is a P2WPKH (Pay to Witness Public Key Hash): OP_0 0x14

where the PubKey Hash is the RIPEMD160 of the SHA256 of the public key, as before, and 0x14 is the number of bytes in the PubKey Hash. So, to turn this script into an address, you simply apply BASE58CHECK to the RIPEMD160 of the SHA256 of the script OP_0 0x14

except you prepend 0x05 to the script hash instead of 0x00 to denote the address type is a P2SH address.

If you like the article, check out my course on how to Become a Bitcoin + Blockchain Programmer.

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