How i can get Bitcoin Address from a Bitcoin Private Key. I understand the whole method except the first one where, the public key and its x and y cord comes from the hash/private key. If i can get a code example in php it would be more helpful for me. May 31, 2017 There are a number of explanations on what blockchain is and what exactly is the difference between Bitcoin and blockchain, but another area where I get many questions, is the difference between public and private blockchain.
This article has 3 sections - one for the new Blockchain.info wallets based of BIP39 seeds, one for classic wallet addresses imported into the new wallet and one for the classic old wallets.
For Blockchain.info's newer wallets based on a recovery phrase
Note: Blockchain.info's new wallets make use of a bip39 recovery seed to generate EVERY ADDRESS and PRIVATE KEY in your Blockchain.info account. At this time it is not possible to extract only 1 address' private key so the only option is to make use of the recovery seed to gain access to the address that has your OmniTokens. Extreme care should be taken to perform the following steps on an airgapped/offline machine to preserve the integrity of your recovery seed. You may even want to consider this method a fallback/last resort and after completing the recovery actions discard all addresses/wallets/accounts and start a new Blockchain.info wallet.You have been warned
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- If you do not already have your Blockchain.info recovery seed/phrase you will need to login to your Blockchain.info account and navigate to the 'Security Center' and then click on the 'Phrase Backup' Option under Level 1 (Note: Once you backup the recovery phrase you will not be able to access it again. Make sure you properly record this info)
- If you have more than 1 wallet in your blockchain.info account you will need to determine which wallet contains the address you want to recover.
- In blockchain.info's wallet go to 'Settings-> Addresses'. You will see all your wallets listed by name.
- If you only have 1 then your Account number for step 6 is 0. If you have more than 1 then use the 'Manage Address' button to display the addresses within each wallet until you find the wallet that contains the address you want to recover/import into Omniwallet.
- Count down the list of wallets starting with 0 for the first/'My Bitcoin Wallet' and when you reach the wallet that has the address make note of its number. This will be the account number for step 6.
- Once you have your recovery phrase you will need access to the Bip39 generator
- We recommend you download the 'bip39-standalone.html' file directly from github to thumbdrive
- On your offline machine access/open/load the 'bip39-standalone.html' file
- Enter your Blockchain.info recovery phrase/seed in the webpage next to 'BIP39 Mnemonic'
- Choose number of words = '12' (or set the number of words for how many were in your recovery phrase)
- Scroll down to the 'Derivation Path' (leave BIP44 selected) and enter your account number from step 2 here.
- Leave all the rest of the entries set to their default
- Scroll down to the 'Derived Addresses' section and you should now see a list of addresses that will match the list of addresses in blockchain.info for your wallet.
- Find the address in question and copy its private key.
- 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/logged into your wallet go to the 'My Address' page and click the 'Import Address with Private Key' Button.
- Enter the private key you exported from blockchain.info 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.
- If the newly imported address does NOT match the address you are expecting try taking a look at this article: After importing my private key and the address I get is different than what I expected!
For Blockchain.info addresses imported into the New Blockchain.info Wallet from Blockchain.info's Classic Wallets
- Login to your wallet on Blockchain.info
- Goto the 'Settings' Menu on the left
- Goto the 'Addresses' Submenu under 'Settings' Menu
- On the right side find the section named 'Imported Addresses'
- Click on 'Manage Addresses'
- On the new screen find the address you want to export the private key from
- Click on the 'More Options' on far right side of that address
- Select 'Private Key' and then 'Continue'
- Choose the 'Private Key Format' : 'WIF'
- Copy the Private Key listed and go to your Omniwallet
- 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/logged into your wallet go to the 'My Address' page and click the 'Import Address with Private Key' Button.
- Enter the private key you exported from blockchain.info 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.
- If the newly imported address does NOT match the address you are expecting try taking a look at this article: After importing my private key and the address I get is different than what I expected!
For Blockchain.info Classic Wallets
- Login to your wallet on Blockchain.info
- Click 'Import/Export' link in the second header
- Click 'I Understand' to the advanced warning
- On the left side menu click 'Export unencrypted'
- Enter your secondary password
- Select the 'Private Key Format' of 'Bitcoin-QT Format'
- In the window underneath you will see a bunch of json formatted text (text enclosed in {} braces).
- Search for the last few lines that look like 'addr':'1Pd3','priv':'....'
- Your private key will be the shown after the 'priv' and will start with either the number 5 or the letter K
- 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/logged into your wallet go to the 'My Address' page and click the 'Import Address with Private Key' Button.
- Enter the private key you exported from blockchain.info 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.
- If the newly imported address does NOT match the address you are expecting try taking a look at this article: After importing my private key and the address I get is different than what I expected!
Clone this wiki locally
This page contains sample addresses and/or private keys. Do not send bitcoins to or import any sample keys; you will lose your money.
A private key in the context of Bitcoin is a secret number that allows bitcoins to be spent.Every Bitcoin wallet contains one or more private keys, which are saved in the wallet file.The private keys are mathematically related to all Bitcoin addresses generated for the wallet.
Because the private key is the 'ticket' that allows someone to spend bitcoins, it is important that these are kept secret and safe.Private keys can be kept on computer files, but are also often written on paper.
Private keys themselves are almost never handled by the user, instead the user will typically be given a seed phrase that encodes the same information as private keys.
![Encryption Encryption](/uploads/1/2/6/1/126129443/378671965.jpg)
Some wallets allow private keys to be imported without generating any transactions while other wallets or services require that the private key be swept.When a private key is swept, a transaction is broadcast that sends the balance controlled by the private key to a new address in the wallet.Just as with any other transaction, there is risk of swept transactions to be double-spending.
In contrast, bitcoind provides a facility to import a private key without creating a sweep transaction.This is considered very dangerous, and not intended to be used even by power users or experts except in very specific cases. Importing keys could lead to the Bitcoins being stolen at any time, from a wallet which has imported an untrusted or otherwise insecure private key - this can include private keys generated offline and never seen by someone else[1][2].
An example private key
Private Key Definition
In Bitcoin, a private key is a 256-bit number, which can be represented one of several ways.Here is a private key in hexadecimal - 256 bits in hexadecimal is 32 bytes, or 64 characters in the range 0-9 or A-F.
Anders Public Key And Private Key Generation In Blockchain Stock
Range of valid ECDSA private keys
Nearly every 256-bit number is a valid ECDSA private key. Specifically, any 256-bit number from 0x1 to 0xFFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFE BAAE DCE6 AF48 A03B BFD2 5E8C D036 4140 is a valid private key.
The range of valid private keys is governed by the secp256k1 ECDSA standard used by Bitcoin.
Hierarchical Deterministic (HD) Wallet Keys
- Main article: Hierarchical deterministic wallet
Wallet software may use a BIP 32 seed to generate many private keys and corresponding public keys from a single secret value. This is called a hierarchical deterministic wallet, or HD wallet for short. The seed value, or master extended key, consists of a 256-bit private key and a 256-bit chain code, for 512 bits in total. The seed value should not be confused with the private keys used directly to sign Bitcoin transactions.
Users are strongly advised to use HD wallets, for safety reasons: An HD wallet only needs to be backed up once typically using a seed phrase; thereafter in the future, that single backup can always deterministically regenerate the same private keys. Therefore, it can safely recover all addresses, and all funds sent to those addresses. Non-HD wallets generate a new randomly-selected private key for each new address; therefore, if the wallet file is lost or damaged, the user will irretrievably lose all funds received to addresses generated after the most recent backup.
Base58 Wallet Import format
- Main article: Wallet import format
When importing or sweeping ECDSA private keys, a shorter format known as wallet import format is often used, which offers a few advantages.The wallet import format is shorter, and includes built-in error checking codes so that typos can be automatically detected and/or corrected (which is impossible in hex format) and type bits indicating how it is intended to be used.Wallet import format is the most common way to represent private keys in Bitcoin.For private keys associated with uncompressed public keys, they are 51 characters and always start with the number 5 on mainnet (9 on testnet). Private keys associated with compressed public keys are 52 characters and start with a capital L or K on mainnet (c on testnet). This is the same private key in (mainnet) wallet import format:
When a WIF private key is imported, it always corresponds to exactly one Bitcoin address.Any utility which performs the conversion can display the matching Bitcoin address.The mathematical conversion is somewhat complex and best left to a computer, but it's notable that the WIF guarantees it will always correspond to the same address no matter which program is used to convert it. Generate private key from jks.
The Bitcoin address implemented using the sample above is: 1CC3X2gu58d6wXUW_SAMPLE_ADDRESS_DO_NOT_SEND_MffpuzN9JAfTUWu4Kj
Mini private key format
- Main article: Mini private key format
Some applications use the mini private key format. Not every private key or Bitcoin address has a corresponding mini private key - they have to be generated a certain way in order to ensure a mini private key exists for an address. The mini private key is used for applications where space is critical, such as in QR codes and in physical bitcoins. The above example has a mini key, which is:
![Anders Public Key And Private Key Generation In Blockchain Anders Public Key And Private Key Generation In Blockchain](/uploads/1/2/6/1/126129443/946884325.jpg)
Summary
Any Bitcoins sent to the address 1CC3X2gu58d6wXUW_SAMPLE_ADDRESS_DO_NOT_SEND_MffpuzN9JAfTUWu4Kj can be spent by anybody who knows the private key implementing it in any of the three formats, regardless of when the bitcoins were sent, unless the wallet receiving them has since made use of the coins generated.The private key is only needed to spend the bitcoins, not necessarily to see the value of them.
If a private key controlling unspent bitcoins is compromised or stolen, the value can only be protected if it is immediately spent to a different output which is secure.Because bitcoins can only be spent once, when they are spent using a private key, the private key becomes worthless.It is often possible, but inadvisable and insecure, to use the address implemented by the private key again, in which case the same private key would be reused.
See Also
References
- ↑Bitcoin StackExchange - Why doc says importing private keys is so dangerous?
- ↑Bitcoin StackExchange - Why so many warnings about importing private keys?
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