Bitcoin addresses utility by casascius

Bitcoin address utility by casascius

Если вы читаете это, потому что вы получили физический биткойн-продукт Casascius. Который говорит: “casascius.com/2factor” на нем. Имейте в виду. Что ваша часть может быть погашена только со вторым закрытым ключом. Который не находится внутри части. Если вы не заказали его непосредственно у меня, ключ должен был быть предоставлен вам вместе с куском. Иначе он не имеет никакой ценности.

Что такое двухфакторный физический биткоин?

Двухфакторный физический биткойн-это часть. Которая требует выкупа двух частей информации. Каждая из которых была создана независимо несвязанными сторонами. И обе из которых необходимы для того. Чтобы потратить эти средства.

Двухфакторный физический биткойн Casascius имеет лазерную гравировку на своей лицевой стороне с URL-адресом “casascius.com/2factor-и имеет часть ключевого материала. Вложенного Касасциусом. А другая часть. Как правило. Представляет собой кодовую фразу. Выбранную человеком. Купившим произведение. Для того чтобы вернуть деньги, вложенные в эту монету, необходимо знать как встроенный ключ. Так и вторичную кодовую фразу.

Главное преимущество наличия двухфакторной детали-это высокий уровень безопасности. Поскольку я (эмитент) никогда не обладаю обоими закрытыми ключами в любое время, нет никаких шансов. Что я мог бы украсть средства.

Это делает его полезным для хранения больших объемов биткоина с очень высокой степенью уверенности в том. Что ни один посторонний человек не знает его секретного ключа.

Как это возможно?

Сила в количестве. Биткойн основан на ветви математики, называемой “криптографией эллиптических кривых”, и математика допускает это. Эта концепция называется “умножение эллиптической кривой” и похожа на процесс. Используемый для аутсорсинга создания тщеславных биткойн-адресов. Хотя этот фрагмент основан на нескольких фрагментах материала закрытого ключа. Он имеет только один биткойн-адрес.

Как заказать двухфакторный физический биткоин?

Загружаемый инструмент под названием Bitcoin Address Utility поможет вам начать работу. Bitcoin Address Utility-это программа с открытым исходным кодом, написанная на C# для Windows. А также работающая на Mac OS X и Linux (требуется Mono).

Эта программа имеет несколько функций, но та, которая вам понадобится. Называется “Генератор промежуточного кода” и находится в меню Сервис. Вы вводите здесь кодовую фразу, и она будет преобразована в “Промежуточный код”. Предоставьте эту часть мне в примечаниях.

Я могу сгенерировать биткойн-адреса для нескольких частей из одного промежуточного кода. Если все они потребуют одну и ту же кодовую фразу.

Я также могу создавать двухфакторные физические биткоины из шестнадцатеричного открытого ключа вместо промежуточного кода. В этом случае ключевой материал, который вам понадобится для выкупа части, — это связанный с ней закрытый ключ. Для этого вы также будете использовать экран “объединитель ключей” вместо процесса расшифровки парольной фразы.

Вы дали мне “код подтверждения”. Для чего это?

Цель кода подтверждения состоит в том, чтобы дать вам возможность проверить две вещи: во-первых, что биткойн-адрес. Который вы будете финансировать. На самом деле ограничен вашей парольной фразой.

Во-вторых, он подтверждает, что у вас есть правильный пароль. Экран утилиты “Валидатор кода подтверждения” принимает код подтверждения и выдает вам ваш собственный биткойн-адрес. Код подтверждения полезен для этой проверки и ничего больше. Он не может быть использован для погашения средств и не нужен для погашения средств.

У меня есть двухфакторный физический биткойн Casascius. Но я не знаю парольной фразы. Могу ли я выкупить эти средства?

Нет. Тебе нужны они оба. Нет никакого способа обойти это – если бы это было так, двухфакторная схема не имела бы никакой ценности. Один закрытый ключ-это тот. Который вы сгенерировали. Когда размещали заказ. А другой спрятан внутри физической части биткоина.

У меня есть двухфакторный физический биткойн Casascius. Как мне выкупить эти средства?

You need to use a tool that takes both private keys and combines them into a single private key. Once you have the single private key, redemption is exactly the same as redeeming a single-factor private key.

The Bitcoin Address Utility tool can decrypt encrypted private keys. Use the Address Utility screen for this (it’s under Tools). Type the encrypted private key into the “Private Key (WIF)” box, and the passphrase in the box below it. Then click the double-down arrows. The decrypted hex private key will appear.

If your physical bitcoin contains two key circles. You have a 58-character private key. The one that starts with “6P” is where the code starts. The dashes connect the two halves of the code. But are not part of the code itself.

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Bitcoin Address Utility

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Bitcoin Address Utility is an open-source program that allows a user to do various useful functions with Bitcoin addresses, such as convert them between various formats, encrypt and decrypt them, and print them as paper wallets. This program was started by Casascius and is available for downloading on GitHub at https://github.com/casascius/Bitcoin-Address-Utility. It is written in C# and is based on Microsoft’s .NET / Visual Studio toolchain.

Bitcoin Address Utility runs natively for Windows, and also runs on Linux and Mac OS X using Mono.

The binary can be downloaded from my website at https://casascius.com/btcaddress-alpha.zip (this file also includes the source code from which it was built).

• A calculator that lets you convert between private and public keys, hex and base58, bitcoin and altcoin addresses, etc.
• Bulk Bitcoin address generator;
• Paper wallet printer;
• Decrypter for encrypted private keys;
• Self-escrow utility;
• Intermediate code generator (used for creating encrypted paper wallets);
• Physical bitcoin insert printer (the small round private key paper found in Casascius Coins).

Contents

Address utility screen [ edit ]

The Address Utility screen offers the following functions:

• Create new Bitcoin addresses with corresponding minikey and standard private key formats
• Copy Bitcoin addresses and private keys to the clipboard as QR code images
• Convert minikeys to WIF/hexadecimal private key formats
• Create private keys from text strings via SHA-256 hash («brainwallet»)
• Convert between hexadecimal and WIF private key formats
• Decrypt/encrypt private keys per BIP 0038
• Calculate public key from private key
• Calculate compressed/uncompressed equivalents for public keys
• Confirm that public keys are valid (i.e. that they represent a valid EC curve point)
• Calculate Hash160 from public key
• Calculate Bitcoin address
• Convert between equivalent addresses for Testnet/other altcoins.
• View balance on block explorers

Base58Check Calculator screen [ edit ]

The Base58Check calculator screen allows quick conversions between the Base58Check encoding commonly used in Bitcoin-related objects and the encoded hexadecimal equivalent. This screen is especially useful for discovering what hexadecimal prefix is required to create Base58Check strings with a specific prefix, or for seeing what is encoded in non-standard Base58 strings generated by service providers.

The 32-bit checksum is verified on all Base58 entries, and «invalid» is displayed in the hex box if the checksum is incorrect. However, verification of the checksum can be skipped simply by appending a question mark to the end of the Base58 string. Once the hexadecimal equivalent is known, simply making an insignificant change to the hex box (such as adding a space to the end) will result in the correct checksum being recomputed and displayed.

If «invalid» is still shown after adding a question mark to the Base58 string, it probably contains invalid characters such as 0, O, I, or l.

Key Combiner screen [ edit ]

The Key Combiner screen allows elliptic-curve arithmetic on Bitcoin public and private keys. Specifically, multiplication can be used for creating two-factor Bitcoin addresses, and addition can be used for secure vanity address generation.

The two boxes accept either a public or private key in any recognized format (hexadecimal, WIF, minikey, etc.).

Multiplying or adding two private keys yields a new private key, as well as its corresponding public key and Bitcoin address.

Multiplying or adding a private key and public key yields a combined public key and Bitcoin address, but no private key. When the public key input is replaced by the matching private key, then calculating the resulting private key becomes possible.

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casascius

Bitcoin Address Utility is an open-source program I maintain which does a variety of things. In general, whenever I write a Bitcoin-related utility, I tend to add it to this program, so it has become a “Swiss army knife” hodgepodge of various things I have created. This program runs natively under Windows, but because it was written in C# it will also run under Linux and Mac OS using Mono, a free software tool that allows C# / .NET programs to run without Windows.

The source code can be found on github at https://github.com/casascius/Bitcoin-Address-Utility

The binary can be downloaded from my website at https://casascius.com/btcaddress-alpha.zip (this file also includes the source code from which it was built).

• A calculator that lets you convert between private and public keys, hex and base58, bitcoin and altcoin addresses, etc.
• Bulk Bitcoin address generator
• Paper wallet printer
• Decrypter for encrypted private keys
• Self-escrow utility
• Intermediate code generator (used for creating encrypted paper wallets)
• Physical bitcoin insert printer (the small round private key paper found in Casascius Coins)

Announcements on Bitcointalk I have made related to this utility:

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2 comments

Is there a bitcointalk thread where you describe how to use the escrow tool part of btcaddress? It would be useful to have a canonical post to point people at.

The “Do-it-yourself Escrow with two-factor address utility” (December 2012) post talks about a passphrase, which isn’t part of the current scheme it seems.

Also, is there somewhere where you describe exactly how you generate the various codes? I’m thinking it would be useful to reimplement the same scheme in something that doesn’t rely on Microsoft code.

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Bitcoin addresses utility by casascius

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Bitcoin addresses utility by casascius

Generates Bitcoin addresses, converts between hex/address and public/private keys.

https://github.com/casascius/Bitcoin-Address-Utility

Tags	bitcoin
Implementation	CSharp
License	Public
Platform	Windows

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