Private keys are for signing transactions.

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Unknown key format when importing Private Key from Multibit to Blockchain.info

I'm trying to import a Private Key from MultiBit into Blockchain.info, but get an error saying "Error importing private key: Unknown Key Format". Is my MultiBit key in the wrong format or something?
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22 views

Is Bitcoin vulnerable to a Birthday Attack against Private Keys? [duplicate]

This is a definition of the Birthday Attack. Someone claims Bitcoin is vulnerable to such an attack in the bitcoin IRC chat. Are they correct?
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20 views

how is the private/public keypair for spent bitcoins connected to the private/public keypair which corresponds to my address?

Spending bitcoins costs me to sacrifice (i.e. can only be used once) a private/public keypair, am I right? Receiving does not use up a private/public keypair, am I right? Creating a new address also ...
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1answer
43 views

Does a private key always generate the same public key and address?

It seems like depending on the method you get different public keys and addresses when using bitcoin-ruby with the same private key. I am probably doing something wrong, but I am not sure where it ...
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1answer
40 views

Bitcoin Testnet Trouble with bitcoin-ruby

I am having trouble with the bitcoin-ruby gem. I get the following error when trying to send money to another address I have on the test network: ...
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2answers
9 views

Is it possible to shift/modify a ECDSA keypair by a scalar where the public key can be computed using only public information?

I am looking for a method which would allow a keypair to be modified in a manner which is unpredictable to the original creator. So I was thinking a user creates a key and commits it by making a ...
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1answer
19 views

Getting bx to create a private key from known chain code and a private EC WIF key?

I was trying to get strong feedback that I really understood a portion of the Mastering Bitcoin Book concerning HD wallets. The picture below is the reference for the question. I checked out the ...
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1answer
16 views

How can I get the private key from multibit?

The website shows a completely different UI and shows many options that the current version doesn't have. How can I find my private key? ...
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0answers
31 views

php private key to wallet import format (wip)

I have been writing a php file intended to create a bitcoin private key and change it to wallet import format. The issue is when I try a command in a gnome-terminal such as: bitcoin-cli importprivkey ...
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1answer
118 views

Where can I import my keys from computer to multiBit HD

I have upgraded my multiBit classic to multiBit HD but I am having hard time to find how to import private keys to my multiBit HD wallets. Any idea ?
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38 views

Finding private key [duplicate]

How do I find the private key in order to transfer my bitcoins from bitcoin core. The block chain keeps crashing before synchronization takes place. Appreciate the feedback
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59 views

Same identical R value of all transaction not provide corresponding privatekey

ECDSA Signature and the “z” value from above link learn calculation of z value and to get private key https://blockchain.info/tx/9ec4bc49e828d924af1d1029cacf709431abbde46d59554b62bc270e3b29c4b1 ...
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1answer
50 views

wallet.dat file compromise

If the private key(s) are/is in the wallet.dat file, then isn't it overly exposed to hackers? Can't a hacker just read my C:[dir]\wallet.dat file and take all the bitcion?
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1answer
48 views

ELI5: What's the difference between a child-key and a hardened child-key in BIP32

I've read BIP32, and I do understand it more or less. Could someone please explain to me live I'm 5 years old what the difference between a child-key and a hardened child-key is? I'm trying to add ...
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1answer
60 views

Can I verify a sub public key came from it's parent public key in a HD wallet without involving any private keys?

I know I can sign a piece of text using a bitcoin private key to prove control over a public address but are there any operations I can perform to know if a public key submitted to me was derived from ...
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1answer
63 views

math to make a full private key have a mini private key equivalent

When creating a private key, how would I ensure that there is a mini private key equivalent, which could be substituted in place of the the full private key? What math would I have to use to create ...
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1answer
51 views

Private keys importing in format got by dumpprivkey

I backed up my private keys this way: Opened my peerunity wallet (bitcoin-qt fork), opened Debug window, issued dumpprivkey and I got my private key. Then, I wrote it on a piece of paper (!). Now, I ...
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2answers
85 views

Bought bitcoins without a wallet. How do I spend them?

I bought some bitcoins from Bittylicious a few days ago. I didn't have a wallet at the time but Bitcoin Core wallet has finally synchronized. I have the transaction ID and address and everything I ...
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1answer
39 views

Can I 'un-import' private key?

I'm checking out the test net and a frendly person gave me access to his private key so that I didn't need to generate coins, so I importprivkey the key, sent me some coins and... Well, I understand ...
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1answer
144 views

HD wallets with an exposed child private key

HD wallets as described here are built based on a master seed and a master public key as follows: PK.b = PK.a + sG SK.b = SK.a + s I just got a little confused about this. Is s the mnemonic seed ...
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1answer
137 views

Address generator for Bitcoin wallet

As describe by Maxwell here in HD wallets assuming we have a key pair with private key SK.a and public key of PK.a and a seed s and a generator point G, we can generate a new key pair of (SK.b, PK.b) ...
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1answer
153 views

Generating private keys in Java

I'm looking for a way to generate private keys in Java. I'd like to make this a standalone program, so I'd rather not use a library like bitcoinj. From my research I've only seen people recommend ...
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2answers
80 views

How can transactions be verified without the private key?

Trying to get my head around her royal Bitcoin here... I understand that blocks of transactions are broadcast to the network, and that miners verify that the BC is 'spendable' by trawling the ...
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3answers
281 views

Can same private key generate multiple addresses?

Is this possible using some clever bitcoin script? The intention is to get more privacy. I can give different addresses to different people still no one can guess how much I make in total. I can do ...
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1answer
78 views

What roles of WIF(Wallet Import Format)?

I am reading "Mastering Bitcoin" written by Andreas and I found this explanation about "WIF(Wallet Import Format)" Key Formats Both private and public keys can be represented in a number of ...
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3answers
219 views

pycoin command line transaction

Is there a quick way to do transactions knowing only the private key(secret exponent) and the destination address, preferably from a command line utility such as pycoin? I am using Debian/Ubuntu and ...
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3answers
139 views

Can an exchange work which does not have control of the private keys?

It seems like there is really no great way to exchange USD for BTC. Having to trust an exchange with your private keys is undesirable. I'm wondering if there is a way to utilize the convenience of ...
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1answer
133 views

Where can I find code that allows me to calculate Z1 and Z2 from an ECDSA signature?

By following Recovering Bitcoin private keys using weak signatures from the blockchain, I am able to do other calculations, but I have no idea how to calculate Z1 or Z2. There was a public code ...
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1answer
1k views

Can private keys remain offline for their entire life?

I am new to Bitcoin and this question is based on 3 assumptions that may be incorrect. Assumption 1: If I understand correctly, the Bitcoin address is generated algorithmically independent of the ...
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168 views

Can't withdraw from blockchain.info: “Private key does not match bitcoin address [my address] = [probablyprivkey1] | [probablyprivkey2]”

I have some BTC (and I really need money now) on my Blockchain.info account, I can't withdraw them (just send them to another BTC address) as it tells me "Private key does not match bitcoin address ...
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1answer
93 views

How can I use a vanity address as my main address

I obtained a vanity bitcoin address (1MonkeyQWbMzny7BNTA66W9wv6KaCFFAB7) along with its private key. I would like to be able to use this as my main address. Sites like BlockChain.info allow you to ...
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1answer
244 views

Create addresses in bulk; and check balance

I am new to Bitcoin; our company wants to use bitcoin for payments. We need to create a address for each transaction. so we need to create many public address. First, I need to generate many public ...
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3answers
77 views

Why I don't need to specify public key to import paper wallet

I created a paper wallet on coinbase and wanted to import it to coinbase.com. It allowed me to import it by specifying private key only. I was surprised that I didn't have to specify public key as ...
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215 views

two people with same PUBLIC address, how will people/network know how to deliver bitcoin

I understand that a bitcoin address is a combination or more than one kind of encryption and entropy, and I also understand how improbable it is that the same address will get generated at the same ...
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1answer
45 views

BIP38 on multisig? Does it work?

I was making a multisig account with 3 of my Bitcoin addresses. The multisig account needs 2 of 3 private key to spend the Bitcoins in there. Then, I came up with an idea that nobody on the internet ...
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1answer
114 views

PHP Checking privatekeys

I am setting up my site on a hosting (not a server, just a hosting) where i will accept payments of bitcoins and maybe other cryptos later, after a week or so, i want to "sweep" my wallets. In short: ...
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110 views

How do I obtain the “Private Key” from my Armory Paper Backup

1) My laptop with Armory and bitcoin has been stolen. However, I have a Paper Backup - which gives: Wallet Version / Wallet ID / Wallet Name / Backup Type / Root Key (72 letters) - but NO "Chain ...
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1answer
157 views

How do I import private keys en mass from a text file?

How do I import private keys en mass from a text file? They are in Wallet Import Format, e.g. 5HueCGU8rMjxEXxiPuD5BDku4MkFqeZyd4dZ1jvhTVqvbTLvyTJ. Would there be any limitations to the number of keys ...
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1answer
83 views

Is it correct that more than 160 bits of input data for producing a private key are superfluous?

If this is true, when I make a 64 character hexadecimal private key I need only provide randomness for the first 40 characters (40 x 4 bits per character = 160). The remaining 24 characters can be ...
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126 views

When you sweep a private key at Blockchain can you sweep the key in HEX format?

It would be useful to know this because I have made a 64 character hex private key by hand and generated the address without storing the key in WIF format. I don’t want to go online, input the hex key ...
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3answers
226 views

How do I spend Bitcoins from a specific address?

What's happening when I use importprivkey? Are the coins merged to my existing private key or is the new key added to my wallet? I want to import a private key, receive funds on it, and send the same ...
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1answer
136 views

Get private key from BigInteger

I have a BigInteger that represents a private key. How can I get that private key as a base58 encoded string? The following pseudo code does not work properly: base58.encode(bigInt.toByteArray) // ...
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2answers
40 views

Sendtoaddress using custom private key

Let's say the user sends me his private key. What is the appropriate RPC command to spend the Bitcoins of this user using his private key? Should I import his private key in the wallet before?
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24 views

How do I export a private key from my Bitcoin-QT wallet if the wallet isn't synced? [duplicate]

I started syncing a bitcoin-qt client, and had somebody send me funds to an address generated in the client. I then stupidly decided to speed up the syncing process and downloaded a torrent of ...
2
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0answers
65 views

Key Pools and best practices

I'm wondering about what the best practices are around generating and maintaining key pools for a wallet. What is the maximum number of keys/addresses that can be created for a single wallet? ...
4
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1answer
125 views

Why doc says importing private keys is so dangerous?

There are a lot of applications when someone would like to import a private key. However in wiki documentation they say it is very dangerous: https://en.bitcoin.it/wiki/How_to_import_private_keys ...
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125 views

Where can I find a C or C++ implementation of converting bitcoin privatekey to bitcoin public key and bitcoin address?

There are versions in python and some such things, but I need a C version (or at least C++). I do have the sha256, RMD160 in C already, and those functions are called. Thank you.
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1answer
68 views

Are specific private keys weaker than others?

I've heard some discussion about how certain private keys can be considered weaker because they were generated using a weak randomness algorithm. I have very little experience in this subject and ...
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1answer
56 views

Can unrelated people know the private key of a multisig address?

After a multisig address is created, can one of the private keys of that address be known by an unrelated person and the security of that address still remain uncompromised? My understanding being ...
4
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2answers
743 views

How do I extract my private keys from a protobuf wallet?

Recent changes to Andreas Schildbach's Bitcoin client for Android have removed the option to export private keys. This has been replaced by an option to back up the entire wallet. Unfortunately, the ...