Private keys are for signing transactions.

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29 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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2answers
50 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 ...
2
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3answers
105 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
33 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 ...
12
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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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0answers
51 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
58 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
93 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
59 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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3answers
170 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 ...
0
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1answer
38 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
66 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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68 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
94 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 ...
1
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1answer
63 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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0answers
55 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 ...
3
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3answers
146 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 ...
1
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1answer
84 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
32 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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0answers
23 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
43 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? ...
3
votes
1answer
97 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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66 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.
2
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1answer
59 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 ...
1
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1answer
51 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 ...
3
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1answer
506 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 ...
2
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1answer
43 views

Exporting Private Keys for wallet in Multibit

My computer just got formatted, and so did my wallet. I had imported the private keys from my wallet a week back. Can I just load that again into multibit, and get my bitcoins back? I have also had ...
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1answer
136 views

If I have only the private key from a multibit private key export, how can I use the bitcoin later elsewhere?

In multibit, you can export the private keys from a wallet into a basic text document (*.key). It will look something like this: # KEEP YOUR PRIVATE KEYS SAFE ! # Anyone who can read this file can ...
2
votes
1answer
60 views

Multibit saving after transaction - what do wallet private key backups look like, if they exist?

I sent some bitcoins from a multibit wallet to another wallet. I recently realized that the change not sent in this transaction is sent to a new address. This means I didn't back up the key of this ...
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2answers
75 views

Using paper based public/private keys in bitcoin-qt [duplicate]

If I only have a public key string and a private key string written on a sheet of paper. How do I use those in bitcoin-qt? If this can be added to bitcoin-qt, will it eventually show me how much ...
0
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0answers
14 views

Are transactions verified/checked also by full nodes, or only by miners? [duplicate]

Suppose I create an illegal transaction. Of course the default client won't create or sign such a tx to begin with, but for argument's sake let's say I rigged my software (built a modified version). ...
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1answer
34 views

One private key in different locations?

Can I still use my key pair to receive and send bitcoins, even if I imported the private key in another location? I wondered about this, when I planned to import a backup of my online wallet in a ...
0
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1answer
170 views

ELI5: How do I import keys from blockchain.info backup into MultiBit 0.5.18

So, blockchain.info is holding my account hostage. My phone with my 2FA was lost (and remotely wiped) and they refuse to remove the 2FA on my account to get access. I have a recent backup of my keys ...
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0answers
90 views

How do you do point multiplication in bitcoin associated with the ecdsa algorithm?

I have posted a similar question recently, but not this specific. I have found that a lot may ride on the idea of "point multiplication" yet all explanations I have found lack explanation or are in ...
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0answers
34 views

How do I validate a WIF private key for Peercoin?

I have a private key for a peercoin address, generated as follows: Go to peeraddress.org Click on Wallet Details Fill in 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaa' in the 'private key field' Copy the 'Private ...
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3answers
132 views

Is it possible generate three public key( address ) by only one private key?

I hear that each address has one private key. Is it possible generate three public key address by only one private key?
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1answer
84 views

CoinPunk questions with private base58 encoded private keys?

I am extemely sorry if this not the right place... but thought I could maybe get some pointers? Well, basically, if you look at this: ...
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0answers
182 views

Import private keys from Multibit into Armory?

I am attempting to import a private key that was made in Multibit, into Armory. I am able to restore this key into other wallets, such as the Android Bitcoin Wallet, Mycelium and Electrum, but when I ...
2
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3answers
93 views

How do I flush the keypool?

After the heartbleed vulnerability, I'm concerned that my private keys could have been compromised. I want to send all my coins to a new address with a freshly generated key. However, if I just ask ...
2
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2answers
68 views

Generating addresses on the fly or pre-generate and store public key?

When running a service that needed a bitcoin address, would it be better to generate a new address to use at that moment and store the private key on your server, or would it be better to pre-generate ...
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0answers
80 views

If I accidentally delete an address with funds

If the address is deleted (while using an online provider like CoinJar), does that mean the coins are lost for good? Or all public/private keys are still held by the company and the address deleted ...
1
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1answer
148 views

How to import say 1million bitcoin privkeys in bitcoind / bitcoin-qt?

I was wondering if there are ways to automate / mass private key import into the bitcoin client. Anyone knows of a command or has a script or an idea to share? thanks.
1
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1answer
494 views

What happens if I delete wallet.dat?

I have this question, say I have my coins in my local wallet and 1 of 2 things can happen, say I somehow delete the wallet.dat file or some kind of malware deletes the file. I have the password ...
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0answers
125 views

Decentralised escrow / distributed private key generation

Issue Hi As many others i am curious in addressing distributed escrow problem (not just for bitcoin). As it stands now there are no decentralised escrows. All escrow services are based on trust in ...
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1answer
102 views

Import private key on multiple computers

I decided to make some custom addresses for personal use and I have two computers running bitcoin clients. I imported the private key of the wallet I generated to the wrong computer and then I ...
1
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0answers
59 views

Converting multiple btc private keys in standard text format to WIP

Ok, going crazy! I have a file that lists my old private keys (2011) (not original wallet.dat, just keys txt file). I need to convert each of these keys (not one at a time) into either a WIP key ...
2
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2answers
172 views

What if the brain wallet is just a memorable private key itself?

A brain wallet usually applies a hash function on a passphrase to derive the private key. But what if the private key itself is memorable and we just use the private key as the brain wallet? For ...
0
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1answer
54 views

What is my private key?

No computer at the moment, so I have Wallets at two independent websites. I sent millibits from one wallet to the other. I hear that you have to use your private key to do that. So, I guess that ...
2
votes
3answers
255 views

What happens if I send bitcoins to my private key instead of my actual bitcoin address?

I recently used the website https://www.bitbrothersllc.com/Bitbrothersllc/Welcome.html to obtain my bitcoins, but when I was asked what address to send my coins to, I accidentally put down my wallet's ...
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1answer
718 views

Security and recover issues in blockchain.info wallet

I have a wallet in blockchain.info. I'm quite new to bitcoin and would be happy if someone would explain me : (1) what should I do in order to save my bitcoins if something happens to ...