How to transfer addresses from Satoshi client to MultiBit?

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It does not answer your question of getting your private keys out of bitcoin-qt, but this link explains how you import a single private key into MultiBit:

http://multibit.org/help_importASingleKey.html

If you have more than one private key it is simply more rows in the import file.

The date alongside each key is a bit non-obvious. It has to be before the date of the first transaction using that key so that the blocks with the transactions in can be found. I recommend just finding the first transaction in your wallet and putting the date one day before it in on every row. (Using a day earlier avoids any time zone problems).

Note that the import only knows about the sipa format private keys (the ones beginning with a 5). It does not understand compressed keys. ( What is a compressed Bitcoin key?...

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Note: Recent versions of the satoshi client offer a 'debug window' which can be used to export private keys. This is described in Miguel Moreno's answer to this question, and is easier than the steps I describe below.

To export a private key from your satoshi client:

you need to define a username and password in bitcoin.conf in the same folder as wallet.dat; this only needs doing once; you may have to create the file; add the following lines, changing the username and password to whatever you like:

rpcuser=someusername

rpcpassword=somepassword

run: bitcoin-qt -server and wait for it to load the blockchain and start up

if your wallet is encrypted, run: read -s x; bitcoind walletpassphrase "$x" 600; unset x to unlock it for 600 seconds (type your passphrase after hitting return, then hit return again; this 'read; ...; unset' prevents the password being written to your shell's history file on disk, and the '-s' in read prevents your...

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If you are unverified, have two factor on and lose your phone then we will ask you to sign a message with the address associated to the address you sent bitcoins to when funding your account.

A cool function of Bitcoin not mentioned in introductions is its message signing and verification feature. I'll use the Satoshi client on a Mac as the example but the same functions are available in the wallet at blockchain.info and in any decent Bitcoin client.

Suppose you have a dispute with a vendor you paid in bitcoin. They say you didn't pay them the correct amount or they didn't get paid at all. So you show them the record of the transaction.

Great, says the vendor, but how do I know that's your coin?

In the Satoshi client, go to the "Receive Coins" tab. At the bottom, you'll see an option that says, "Sign Message" (you can also go to File > Sign Message). Enter the Bitcoin address that you own that initiated the transaction (that's the address to the left of the...

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This is a way to prove you do possess a particular walet.

You can sign any message using your private key, creating an encrypted string - a signature. You then send the original message along with the signature (please make clear what is and what isn't a part of the message, and be aware that every character, including spaces, tabs and line breaks, is a part of the message).

We can then verify whether the signature was created using the private key you claim to own.

The message to be signed should express your request.

You can do this using one of the modern wallet softwares. You can take a look at our tutorials for MultiBit or Bitcoin-Qt

Before sending us your signed message please try if you are able to verify it. For example here: https://brainwallet.github.io/#verify

MultiBit

Start by choosing a wallet and copying its address to clipboard.

Then choose the menu option 'Tools | Sign Message'.

...

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Bitcoin is the currency of the Internet: a distributed, worldwide, decentralized digital money. Unlike traditional currencies such as dollars, bitcoins are issued and managed without any central authority whatsoever: there is no government, company, or bank in charge of Bitcoin. As such, it is more resistant to wild inflation and corrupt banks. With Bitcoin, you can be your own bank.

If you are new to Bitcoin, check out We Use Coins and Bitcoin.org. You can also explore the Bitcoin Wiki:

How to buy bitcoins
Buying Reddit Gold with bitcoin

Will I earn money by mining bitcoin?

Security guide for bitcoin

Community guidelines

Do not use URL shortening services: always submit the real link. Begging/asking for bitcoins is absolutely not allowed, no matter how badly you need the bitcoins. Only requests for donations to large, recognized charities are allowed, and only if there is good reason to believe that the person accepting bitcoins on...
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MultiBit is one of the unsung heroes of the bitcoin world. The desktop bitcoin wallet software, launched three years ago, recently surpassed 1.5 million downloads and, in fact, Gary Rowe, one of two core developers on the project, puts the estimate at more like 1.8 million this month.

Now he and development partner Jim Burton are about to start charging tiny fees for using it.

One of the things that must have helped MultiBit a lot was being listed on bitcoin.org. The wallet is one of five desktop wallets listed on that site, and is outpacing at least some of them.

CoinDesk reached out to the bitcoin core development team to ask how many people have downloaded BitcoinQT, the reference implementation of the bitcoin client, but received no response. Electrum, one of the other five wallets, also failed to respond.

What we do know is that Blockchain, the downloadable mobile wallet that also has an online counterpart, has just over 1.6 million users. This...

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What is My Wallet?

My Wallet is free service which makes it easy to send and receive Bitcoins without needing to download a Bitcoin client, and update the blockchain. In short, My Wallet is a secure online wallet designed to simplify the use of Bitcoins for new and experienced users alike.

Are there any fees?

No, it is a free service. You may be asked to include a "miners fee" to help support the Bitcoin network, which is mandatory for the use of Bitcoins.

Is it secure?

Yes it is, we are protected from hacks as all of your private keys are encrypted with your password before leaving your computer. We do not hold a copy of your password, and thus are unable to view or spend your Bitcoins. You retain full control of your private keys, so your wallets can never be seized or blocked and can be imported into any desktop Bitcoin client.

Where can I find help?

Please create a ticket at Support...

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Bitcoin is a type of digital currency invented by an anonymous person/group going by the name Satashi Nakamoto, in which public-key cryptography is used to regulate the generation of units of currency and verify the transfer of funds, operating independently of a central bank. The system is decentralized and works without a central repository or single administrator. All transactions are stored in a public ledger called the block chain.


The block chain is distributed over the bitcoin network; to independently verify the chain of ownership of any and every bitcoin amount, each network node stores its own copy of it. To use bitcoins one needs a so called bitcoin wallet. A wallet stores the information needed to transact bitcoins. Basically a wallet consists of two cryptographic keys, one public and one private. The public key is comparable to a bankaccount number which you can share to recieve funds. The private key is needed to access the funds stored in there. So...

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With an estimated 1.8 million downloads, MultiBit is easily the most popular bitcoin wallet client for Windows-based machines. Recently, however, a series of high-profile glitches and seemingly dismissive developer comments have soured community support for the three-year old software project. With a new version of the software nearing completion, the “cash-strapped” developers have proposed a highly controversial funding plan: Charge a per-transaction fee.

According to CoinDesk’s Danny Bradbury, MultiBit programmers are calling the idea the idea the “Burton-Rowe Income Technique (BRIT),” after developers Gary Rowe and Jim Burton.

The wallet will in future charge 1,000 satoshis per spend. That’s about half a cent at today’s price. Put another way, said Rowe, 800 bitcoin transactions made through MultiBit will earn the developers a latte.”

With the next version of the wallet, MultiBit HD, due out soon, the eight-developer team hopes that users will simply...

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Okay, so I have seen the questions on how to go from Bitcoin Core to MultiBit, but I want to go the other way.

Really, I downloaded and started using the wrong wallet. I wouldn't even mind MultiBit if it wasn't for that the default folder can't be moved (I dislike having a cluttered home folder) - I asked, and the location is hardcoded. Considering I use the default clients for the altcoins, I'd rather go with Core.

I'd transfer my little funds to Bitcoin Core and suffer the fee, but I have less than the threshold (0.006 something).

Is there a way to make my wallet active in Bitcoin Core, preferably without tearing my hair out? Or should I (groan) keep mining altcoins next winter (too hot out right now for my poor PC cranked up), build up my Bitcoin balance by exchange, then transfer wallets the easy way?

Details are appreciated....

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FAQ

The purpose of this FAQ is to give general education and information about Bitcoin. It should not be considered financial advice.

The great thing about Bitcoin is that you do not need to understand how it works in order to use it. If you are interested in diving in a little deeper, this FAQ is for you.

Q: What is Bitcoin?

Put very simply it is a new form of money that works extremely well on the Internet.

Back to top

Q: So it's a "virtual currency"?

No. Virtual currencies are generally tokens issued by a company for near-exclusive use on their site. Examples include loyalty or gift cards, air miles or mobile phone top-ups.

Bitcoin is a general purpose digital currency. It is programmable money.

Nothing like Bitcoin has ever existed before.

In a similar way that email revolutionised the postal service, Bitcoin can revolutionise financial services.

For a broader view at what Bitcoin provides you should...

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In previous posts, we figured out how to compute a Bitcoin address from a private key and we tested our code with an example from the Bitcoin wiki. In this post we try to convert a private key from a real wallet (MultiBit) to its corresponding address.

This is the fourth post in a four-part series titled “Computing a Bitcoin Address”. Here are all the articles in the series:

Let’s consolidate the code from the previous posts to create one function that performs all the steps to convert a private key (in hex) to a public address (in Base58Check). First we create some helper functions:

hash160/hex: performs a SHA–256 hash followed by a RIPEMD–160 hash on an input hex string sha256x2/hex: performs SHA–256 twice on an input hex string add-version0: prepends 0x00 to a hex string compute-checksum: computes the checksum (first 4 bytes of a double SHA–245 hash) of its input add-checksum: computes the checksum for its input and appends that checksum to the...
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mSIGNA

Control over your money

This wallet gives you full control over your bitcoins. This means no third party can freeze or lose your funds. You are however still responsible for securing and backing up your wallet.

Full validation

This wallet requires you to install full node software that validates and relays transactions on the Bitcoin network. This means no trust in a third party is required when verifying payments. Full nodes provide the highest level of security and are essential to protecting the network. However, they require more space (over 100GB), bandwidth, and a longer initial synchronization time.

Basic transparency

The developers of this wallet publish the source code for the client. This means any developer in the world can audit the code. However, you still need to trust developers of this wallet when installing or updating the final software because it was not built deterministically like Bitcoin...

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The question of “how to store your bitcoins” is one of the most important decisions for a Bitcoin user to make, and that is why we have done an extremely thorough Bitcoin wallet review for all major Bitcoin wallets.

In this article we will perform bitcoin wallet reviews, including providing the current best option, by looking at ease of use, security and advanced features for the major wallets in each category: Online Bitcoin Wallets, Desktop Bitcoin Wallets and Mobile Bitcoin Wallets.

To save you some time our conclusion to maximize ease of use, security and advanced features is to use the most well rounded Blockchain.info mobile bitcoin wallet (Android or Apple Store) coupled with the ultra-secure and advanced desktop bitcoin client Armory.

Regardless of what kind of electronic payment system you are using if you want to spend digital money then you need to have a digital wallet. Bitcoin differs from every other online payment system. Bitcoin has no central...

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