Private keys are for signing transactions.

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Transforming private key into address

How do I get to the value in the 'scriptPubKey' part of the transaction ? shows a great example of going from address to scriptPubKey. I'd like to do something similar: go from private key (...
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1answer
23 views

CLI: Generate a new private key, unrelated to any existing wallet

I have a wallet on an offline computer, which has too many backups on connected computers. I would like to generate a totally new bitcoin address on the offline computer, and use it as a cold ...
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15 views

Blockchain wallet dilema

my desktop wallet icon defaults for some reason to a Watch wallet on entering my PW - of course I cannot get at my money from there and I am at loss to solve the problem - Blockchain.info support say ...
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1answer
28 views

Format of private key

On this website, we can see that the the private key 1 is written in this format. 5HpHagT65TZzG1PH3CSu63k8DbpvD8s5ip4nEB3kEsreAnchuDf I would like to know what is this format.
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1answer
100 views

How a private key can be invalid?

From here, we can read that : A private key is a 256-bit value, meaning there are approximately 1.1579e77 possible keys (There are about 1.2288e66 invalid values But here, we have : ...
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1answer
165 views

The number that generates the private key, is it stored somewhere?

I understand that the private key is generated with a random number Specifically, any 256-bit number from 0x1 to 0xFFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFE BAAE DCE6 AF48 A03B BFD2 5E8C D036 4140 ...
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2answers
41 views

How private key is generated?

I read here that: If you could process one trillion private keys per second, it would take more than one million times the age of the universe to count them all. Even worse, just enumerating ...
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1answer
53 views

How can I convert a bitcoin private key (hex) into a Bitcoin public key? [duplicate]

How can I take a bitcoin private key encoded in hex: d1d9a2e9fd3da7e7710310ea17a9edff9e08845c7a6f2ea3d650ba4ae7ee0d3b and convert it to the corresponding public key: ...
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2answers
54 views

What would be a rational subkey depth to use so that my address is infeasible to locate via a systematic search?

Using pycoin. ku <ext_pri_key> -s 1/4/6/2/8/4/2/5....... How many levels deep into the tree would I need to go (using only single digits) before it would be infeasible for an attacker to find ...
2
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1answer
41 views

How to get Mutlibit Hd private keys from mnemonic

I'm trying to use this tool: https://dcpos.github.io/bip39/ but none of the addresses match. I would really appreciate some help.
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1answer
27 views

Derive symmetric keys

Is there some means by which I could derive symmetric keys using bitcoin public keys or HD Wallet public key which I have shared with a second user.
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1answer
100 views

What is the wallet “word seed” that is commonly used in popular wallets clients and what does it do?

I've been using a pretty old version of Multibit classic and recently decided to upgrade. I tried out Multibit HD and Electrum and noticed that both have me set up a wallet with a "word seed". It's ...
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2answers
159 views

Changing a private key of a public Bitcoin address

I would like a way to change the private key of a public address, for this you'd of course require the current private key. Is this at all possible? I want to prove that it can be done, or prove that ...
6
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3answers
544 views

What is the safest physical to store a private key only to be accessed after death?

Assume that my friend would like to encrypt his Bitcoin private key(s) and safely store them in a secret location. This located would only be identified to heirs after death in his will. Should he put ...
7
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1answer
55 views

Why does Base58 WIF-format of PK have '5' prefix (the standpoint of mathematics)

I'm trying create raw private keys using the steps: Take a version of PK (0x80) and concatenate (as prefix)with my pseudo-random 32bytes-array. Take a calculated checksum (4bytes) and push it to the ...
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3answers
69 views

Correct way to convert a 256-bit private key to WIF?

On the Bitcoin wiki it has steps to convert a private key to WIF. So I tried following these steps in attempt to get the same result. So I took the private key. ...
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0answers
50 views

Can Ethereum support compressed secp256k1 public keys to compute Keccak addresses?

Starting from a private key, a working functional example provides details for how an Ethereum address can be calculated from an uncompressed secp256k1 elliptic curve public key. This functional ...
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2answers
57 views

Could a Proof of Burn function be implemented into Bitcoin Core to help prove loss of private keys? [closed]

Is there a list of self reported BTC addresses with lost private keys? Of course such a list would never be conclusive as we would have to trust the people who report that the keys were lost. Could ...
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1answer
72 views

Does the private key have special mathematical properties?

[I read that there are private keys with lengths other than 256 bit. I only talk about 256 bit private keys here. Are other lengths even common and supported by popular wallets like Electrum?] Let's ...
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2answers
35 views

Signing data with ECDSA

I was reading about the math behind bitcoins in this article, and one thing I can't seem to wrap my head around is how the said algorithm is used to sign "data". What exactly is this "data"? Is it my ...
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0answers
50 views

Private key does not match bitcoin address

Here is my situation. I have submitted a request to blockchain support 2 days ago Wallet created on blockchain.info Received bitcoins from someone when i try to send bitcoins to another wallet, i ...
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1answer
59 views

Will hashing bytes from /dev/urandom yield a secure private key?

From what I've read, a Bitcoin private key is a 32 byte long integer. I take this to mean that to have a valid private key, all I need is 32 random bytes and that, by extension, running dd if=/dev/...
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1answer
78 views

Private Brain Key Generation and Public Address Not Matching Java

I am trying to generate a public and private key set from a input string in Java. (Yes I am aware this can be a dangerous practice) I am using bitcoinj for a outside library. I currently have: //...
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2answers
144 views

Does the private key of Bitcoin change everytime the address changes?

I have read from many sites that an address should change every time a Bitcoin transaction is made. Does the private key change along with the Bitcoin address. How is the address obtained from the ...
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2answers
116 views

How to import a 64-byte long private key

Private keys are 256 bits (32-bytes) long, according to bitcoin wiki: https://en.bitcoin.it/wiki/Private_key Diamond Circle, an Australian startup, sent me a pair of bitcoin address and its private ...
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48 views

Why are compressed private keys typically longer than their uncompressed counterpart?

From what I understood, compressed private keys are supposed to represent the same secret key, stored more efficiently thus taking up less space. I assume 'more efficiently' has to do with secp256k1 ...
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1answer
31 views

How secure would it be to use my toy bingo machine to generate a bitcoin private key?

Am I right in thinking there are 90! possibilities. Would it be random? Would you trust this technique? http://i.stack.imgur.com/4RYbc.jpg
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7 views

what is directory.io and who is admin? [duplicate]

This site has a huge database of many Bitcoin private keys, you know if anyone has private keys, he/she can access that wallet easily, so what is the main purpose of this site and where they can ...
2
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2answers
43 views

Is there any wallet that allows safely storing private keys in an offline computer?

I have a computer that is 100% disconnected from the internet. I'd like to: Generate my own private keys by dice rolls; Import them on the offline computer wallet; Send coins to their addresses; ...
2
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1answer
67 views

Is it possible to exploit the use of the same private keys on different crypto coins?

Suppose someone has single private key, and from that private key he made a public key for Bitcoin, Ethereum, Dogecoin, etc. - is it possible to figure out the private key having those multiple public ...
4
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2answers
81 views

Why can't we switch private and public keys?

If private and public keys are performing the same task (although asymmetrically), but I mean each one can encrypt something that only the other one can decrypt, can I create a paper wallet and share ...
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2answers
120 views

Find private key

I have 2 transactions. ...
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2answers
72 views

How do I export my private key on MultiBit

I am using Multbit on my desktop, and I want to use my wallet on a another device like my phone.
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1answer
266 views

How to generate Ed25519 public key from private key using libsodium?

Not all crypto currencies are using secp256k1 technology for keypair generation and digital signatures. Curve25519 technology (frequently used to support ECDH key exchanges) is being used by a few ...
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36 views

Decrypt my private key using KeyCrypter

I am trying to decrypt my private key bytes using the KeyCrypter interface. But i do not know how to implement and call the decrypt() function. Initially i encrypt the bytes of my Private Key of my ...
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1answer
79 views

ECKey.ECDSASignature creation

I have my ECKey key. In order to create an ECDSASignature object with BitcoinJ, we have to call ECDSASignature mySignature = key.sign(Sha256Hash input). Is the Sha256Hash input my message? Or is it ...
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3answers
163 views

Is it important to have an unencrypted backup of the private key?

Am I correct that in not having our private keys written in paper or otherwise backed up we are implicitly trusting the wallet developers to keep publishing wallet versions that are capable of reading ...
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33 views

Where can a table of cryptocurrencies reliant upon particular elliptic curve technologies be found?

secp256k1 Koblitz Curve - is used by Bitcoin and over 100 other altcoins to synthesize public keys; used for address generation. Curve25519 Montgomery Curve - is used by Cryptonote Technologies to ...
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1answer
68 views

Is there a way to sign a transaction with BTC or any Altcoin without a computer using only pen and paper?

Was wondering if this is possible to do. Lets say Satoshi Nakamoto ended up prison in a foreign country and he was only able to communicate with the outside world by writing letters using only a pen ...
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3answers
160 views

Could someone solve for your private keys by sending many transactions to the same address?

I've read that it's never safe to use the same bitcoin address more than once because there is a small chance that someone could solve for your private keys (though I don't have a solid-enough ...
4
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1answer
67 views

Would it be wise and extra secure to use non-ascii characters in a brain wallet?

What are some pitfalls if you use non-standard ascii characters in your brainwallet? Say if you were to use asian language characters? Or even extended ascii characters (http://www.theasciicode.com.ar/...
3
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1answer
159 views

Trying to import Bitcoin ATM wallet into Armory

I withdrew Bitcoins from Bitcoin ATM (Bitcoin mainnet, if that matters) into a wallet that it generated for me. My intention was to import or sweep the generated wallet into Armory (or possibly ...
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1answer
52 views

Is it possible to split a key for transaction signing without using multisig?

I am developing a wallet API, but I don't want custodial control of the user's funds. For reasons I won't explain here, I don't want to use multisig. But I want the advantages of a 2 of 2 multisig. ...
3
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1answer
99 views

Is there a service where you can generate public/private keys without anyone knowing? Like a tamperproof digital envelope

Is there a service where it generates a BTC address with public/private key, but no one knows it until someone pays a fee to reveal it? The idea is basically, some script or some other decentralized ...
2
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1answer
72 views

Redeeming physical bitcoin and transfer from mini private key to my wallet [duplicate]

How do I send bitcoin from physical bitcoin private key to my wallet address? I can't seem to find an option to receive payment from a 30 byte mini private key and the only thing close is to get from ...
2
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1answer
302 views

Export Private Keys from Bitcoin-QT

I am still attempting to complete the receipt of a payment in BitCoin-QT. The initial synchronization is beginning to be a hassle so I thought I might get my key and transfer my wallet to Blockchain....
2
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2answers
138 views

How do on-line wallet or bitcoin exchanges usually secure their private keys?

I suppose they're kept encrypted as not to do so would be the equivalent as saving plaintext passwords. I heard most of them keep a percentage of the funds in cold storage, but then isn't it ...
2
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1answer
63 views

Secret Key value for decimal versions over 127

After reviewing the address prefixes page on the wiki, I have noticed that in Bitcoin and other altcoins that the secret key / dumped private key header is always the decimal version + 128. So with a ...
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1answer
224 views

private key to wif - need help converting to base58encode (step 6 to step 7)

I am trying to learn more about how bitcoin addresses are created. I am following along with the tutorial at https://en.bitcoin.it/wiki/Wallet_import_format I undertsand how they do the first six ...
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1answer
183 views

Creating a Bitcoin online wallet service

My question is this: Lets say I wanted to create a bitcoin site, where users register and can deposit bitcoins into their account. should i use my MPK to generate infinite addresses, so after a user ...