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Generating Bitcoin address from ECDSA Public Key. Ask Question Asked 6 years, 4 months ago. Active 6 years ago. Viewed 8k times 9. I'm writing simple code in C using OpenSSL to generate valid bitcoin address - private key pair. I'm using this snippet to generate public key from given hex-form private key. Your Litecoin Private Key is a unique secret number that only you know. It can be encoded in a number of different formats. Below we show the Litecoin Address and Public Key that corresponds to your Private Key as well as your Private Key in the most popular encoding formats (WIF, WIFC, HEX, B64). Generate Bitcoin and Litecoin address from same private key - gist:6435248.
- Public Private Key Encryption
- Advantages Of Private Key Encryption
- Litecoin Generate Private Key From Qtc
- Bitcoin Generate Private Key From Qt 2
This guide is intended for users of Bitcoin-Qt who do not want to wait for their wallet to be synchronized with the network, which may take many hours or days depending on the hardware spec. The guide teaches users how to transfer their coins to Electrum bitcoin wallet, which has lower security but a faster startup time.
It's a somewhat common situation that users don't open their wallet for months or years, after which they come back to find it will take them hours to have be able to use Bitcoin Core. Another example is where the block files on hard disk have become corrupted requiring parts of the blockchain to be downloaded and verified again.
Public Private Key Encryption
WARNING
Before reading this page, users should note that directly manipulating ECDSA private keys is dangerous and can result in losing bitcoins[1][2]. This guide is for the impatient or time-stressed, it is recommended that users of Bitcoin Core simply wait out the blockchain synchronization. There are many benefits to running a Full node including trustlessness, security and privacy which lightweight wallets cannot match.
Obtain new Electrum wallet
Download Electrum and verify the signature to prove it was not modified in transit. Create a new Standard Wallet and choose 'Create a new seed'. Electrum will give you a seed phrase which you should write down on paper.
Obtain private key(s) from Bitcoin-Qt
In Bitcoin-Qt click Window -> Console.
Advantages Of Private Key Encryption
If your wallet is encrypted, use this command to decrypt it for 5 minutes (300 seconds):
Use the dumpprivkey command to get the private key. Repeat for as many bitcoin addresses as have money in them.
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Do not send this private key to anybody else, they could use it to steal your bitcoins(!)
Sweep private keys with Electrum
In the Electrum window, click Wallet -> Private Keys -> Sweep. Paste the private keys from Bitcoin-Qt here. Check the resulting transaction is okay and click Broadcast to sweep from the addresses in Bitcoin Core to the Electrum wallet.
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If the address generated from the private key is wrong, then on the Sweep Private keys dialog box in Electrum click the Info box in the upper-right. It will give instructions for prefixing your private key so that the correct address is generated. For example if your address starts with 3 then use p2wpkh-p2sh:[your-private-key].
Warning: Make sure the Electrum wallet is not a watch-only wallet. The Electrum window title bar should not say [watching-only]. Go back to #Obtain new Electrum wallet if so.
Once broadcast, the transaction will be relayed to every node in the bitcoin network and should soon be visible as unconfirmed in Electrum's window. It is likely to soon be mined into a block giving it confirmations that make it irreversible.
Related Documents
- Safely Transfer Bitcoin from a wallet.dat File to Anywhere, Using Air-Gapped Offline System, Bitcoin Core, and Electrum (a more complicated extended version of this document for more paranoid people)
References
- ↑Bitcoin StackExchange - Why doc says importing private keys is so dangerous?
- ↑Bitcoin StackExchange - Why so many warnings about importing private keys?
To export a private key from your Bitcoin-Qt / Bitcoin Core client:
- Launch your Bitcoin client
- Click on 'help' in the menu bar (top right)
- Click on 'debug window'
- Select the 'console' tab
- If your wallet is protected by a passphrase (i.e. you have to enter a passphrase before you can send) unlock it by typing
- walletpassphrase 'your walletpassphrase here' 600
dumpprivkey [your Bitcoin address here] - This will return the private key which will start with the number 5
- Once you have your private key if you had to unlock your wallet you can relock it by exiting or typing:
- walletlock
Litecoin Generate Private Key From Qtc
- Once you have this you can go to https://www.omniwallet.org and click 'Create a New Wallet' (or log into a wallet you already created).
- Once you have created and logged into your new wallet go to the 'My Address' page and click the 'Import Address with Private Key' Button.
- Enter the private key you exported and in a few moments that address should be added to your wallet and displayed in the list below giving you access to your BTC and any Omni Protocol properties on that address.
Bitcoin Generate Private Key From Qt 2
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