Core QT wallet - Setup, Backup, Encrypt, Debug & private ...

Groestlcoin 6th Anniversary Release


Dear Groestlers, it goes without saying that 2020 has been a difficult time for millions of people worldwide. The groestlcoin team would like to take this opportunity to wish everyone our best to everyone coping with the direct and indirect effects of COVID-19. Let it bring out the best in us all and show that collectively, we can conquer anything.
The centralised banks and our national governments are facing unprecedented times with interest rates worldwide dropping to record lows in places. Rest assured that this can only strengthen the fundamentals of all decentralised cryptocurrencies and the vision that was seeded with Satoshi's Bitcoin whitepaper over 10 years ago. Despite everything that has been thrown at us this year, the show must go on and the team will still progress and advance to continue the momentum that we have developed over the past 6 years.
In addition to this, we'd like to remind you all that this is Groestlcoin's 6th Birthday release! In terms of price there have been some crazy highs and lows over the years (with highs of around $2.60 and lows of $0.000077!), but in terms of value– Groestlcoin just keeps getting more valuable! In these uncertain times, one thing remains clear – Groestlcoin will keep going and keep innovating regardless. On with what has been worked on and completed over the past few months.

UPDATED - Groestlcoin Core 2.18.2

This is a major release of Groestlcoin Core with many protocol level improvements and code optimizations, featuring the technical equivalent of Bitcoin v0.18.2 but with Groestlcoin-specific patches. On a general level, most of what is new is a new 'Groestlcoin-wallet' tool which is now distributed alongside Groestlcoin Core's other executables.
NOTE: The 'Account' API has been removed from this version which was typically used in some tip bots. Please ensure you check the release notes from 2.17.2 for details on replacing this functionality.

How to Upgrade?

If you are running an older version, shut it down. Wait until it has completely shut down (which might take a few minutes for older versions), then run the installer.
If you are running an older version, shut it down. Wait until it has completely shut down (which might take a few minutes for older versions), run the dmg and drag Groestlcoin Core to Applications.

Other Linux


Download the Windows Installer (64 bit) here
Download the Windows Installer (32 bit) here
Download the Windows binaries (64 bit) here
Download the Windows binaries (32 bit) here
Download the OSX Installer here
Download the OSX binaries here
Download the Linux binaries (64 bit) here
Download the Linux binaries (32 bit) here
Download the ARM Linux binaries (64 bit) here
Download the ARM Linux binaries (32 bit) here


ALL NEW - Groestlcoin Moonshine iOS/Android Wallet

Built with React Native, Moonshine utilizes Electrum-GRS's JSON-RPC methods to interact with the Groestlcoin network.
GRS Moonshine's intended use is as a hot wallet. Meaning, your keys are only as safe as the device you install this wallet on. As with any hot wallet, please ensure that you keep only a small, responsible amount of Groestlcoin on it at any given time.





ALL NEW! – HODL GRS Android Wallet

HODL GRS connects directly to the Groestlcoin network using SPV mode and doesn't rely on servers that can be hacked or disabled.
HODL GRS utilizes AES hardware encryption, app sandboxing, and the latest security features to protect users from malware, browser security holes, and even physical theft. Private keys are stored only in the secure enclave of the user's phone, inaccessible to anyone other than the user.
Simplicity and ease-of-use is the core design principle of HODL GRS. A simple recovery phrase (which we call a Backup Recovery Key) is all that is needed to restore the user's wallet if they ever lose or replace their device. HODL GRS is deterministic, which means the user's balance and transaction history can be recovered just from the backup recovery key.



Main Release (Main Net)
Testnet Release


ALL NEW! – GroestlcoinSeed Savior

Groestlcoin Seed Savior is a tool for recovering BIP39 seed phrases.
This tool is meant to help users with recovering a slightly incorrect Groestlcoin mnemonic phrase (AKA backup or seed). You can enter an existing BIP39 mnemonic and get derived addresses in various formats.
To find out if one of the suggested addresses is the right one, you can click on the suggested address to check the address' transaction history on a block explorer.


Live Version (Not Recommended)



ALL NEW! – Vanity Search Vanity Address Generator

NOTE: NVidia GPU or any CPU only. AMD graphics cards will not work with this address generator.
VanitySearch is a command-line Segwit-capable vanity Groestlcoin address generator. Add unique flair when you tell people to send Groestlcoin. Alternatively, VanitySearch can be used to generate random addresses offline.
If you're tired of the random, cryptic addresses generated by regular groestlcoin clients, then VanitySearch is the right choice for you to create a more personalized address.
VanitySearch is a groestlcoin address prefix finder. If you want to generate safe private keys, use the -s option to enter your passphrase which will be used for generating a base key as for BIP38 standard (VanitySearch.exe -s "My PassPhrase" FXPref). You can also use VanitySearch.exe -ps "My PassPhrase" which will add a crypto secure seed to your passphrase.
VanitySearch may not compute a good grid size for your GPU, so try different values using -g option in order to get the best performances. If you want to use GPUs and CPUs together, you may have best performances by keeping one CPU core for handling GPU(s)/CPU exchanges (use -t option to set the number of CPU threads).





ALL NEW! – Groestlcoin EasyVanity 2020

Groestlcoin EasyVanity 2020 is a windows app built from the ground-up and makes it easier than ever before to create your very own bespoke bech32 address(es) when whilst not connected to the internet.
If you're tired of the random, cryptic bech32 addresses generated by regular Groestlcoin clients, then Groestlcoin EasyVanity2020 is the right choice for you to create a more personalised bech32 address. This 2020 version uses the new VanitySearch to generate not only legacy addresses (F prefix) but also Bech32 addresses (grs1 prefix).




Remastered! – Groestlcoin WPF Desktop Wallet (v2.19.0.18)

Groestlcoin WPF is an alternative full node client with optional lightweight 'thin-client' mode based on WPF. Windows Presentation Foundation (WPF) is one of Microsoft's latest approaches to a GUI framework, used with the .NET framework. Its main advantages over the original Groestlcoin client include support for exporting blockchain.dat and including a lite wallet mode.
This wallet was previously deprecated but has been brought back to life with modern standards.


Remastered Improvements



ALL NEW! – BIP39 Key Tool

Groestlcoin BIP39 Key Tool is a GUI interface for generating Groestlcoin public and private keys. It is a standalone tool which can be used offline.



Linux :
 pip3 install -r requirements.txt python3 bip39\ 


ALL NEW! – Electrum Personal Server

Groestlcoin Electrum Personal Server aims to make using Electrum Groestlcoin wallet more secure and more private. It makes it easy to connect your Electrum-GRS wallet to your own full node.
It is an implementation of the Electrum-grs server protocol which fulfils the specific need of using the Electrum-grs wallet backed by a full node, but without the heavyweight server backend, for a single user. It allows the user to benefit from all Groestlcoin Core's resource-saving features like pruning, blocks only and disabled txindex. All Electrum-GRS's feature-richness like hardware wallet integration, multi-signature wallets, offline signing, seed recovery phrases, coin control and so on can still be used, but connected only to the user's own full node.
Full node wallets are important in Groestlcoin because they are a big part of what makes the system be trust-less. No longer do people have to trust a financial institution like a bank or PayPal, they can run software on their own computers. If Groestlcoin is digital gold, then a full node wallet is your own personal goldsmith who checks for you that received payments are genuine.
Full node wallets are also important for privacy. Using Electrum-GRS under default configuration requires it to send (hashes of) all your Groestlcoin addresses to some server. That server can then easily spy on your transactions. Full node wallets like Groestlcoin Electrum Personal Server would download the entire blockchain and scan it for the user's own addresses, and therefore don't reveal to anyone else which Groestlcoin addresses they are interested in.
Groestlcoin Electrum Personal Server can also broadcast transactions through Tor which improves privacy by resisting traffic analysis for broadcasted transactions which can link the IP address of the user to the transaction. If enabled this would happen transparently whenever the user simply clicks "Send" on a transaction in Electrum-grs wallet.
Note: Currently Groestlcoin Electrum Personal Server can only accept one connection at a time.



Linux / OSX (Instructions)


UPDATED – Android Wallet 7.38.1 - Main Net + Test Net

The app allows you to send and receive Groestlcoin on your device using QR codes and URI links.
When using this app, please back up your wallet and email them to yourself! This will save your wallet in a password protected file. Then your coins can be retrieved even if you lose your phone.



Main Net
Main Net (FDroid)
Test Net


UPDATED – Groestlcoin Sentinel 3.5.06 (Android)

Groestlcoin Sentinel is a great solution for anyone who wants the convenience and utility of a hot wallet for receiving payments directly into their cold storage (or hardware wallets).
Sentinel accepts XPUB's, YPUB'S, ZPUB's and individual Groestlcoin address. Once added you will be able to view balances, view transactions, and (in the case of XPUB's, YPUB's and ZPUB's) deterministically generate addresses for that wallet.
Groestlcoin Sentinel is a fork of Groestlcoin Samourai Wallet with all spending and transaction building code removed.




UPDATED – P2Pool Test Net



Pre-Hosted Testnet P2Pool is available via


submitted by Yokomoko_Saleen to groestlcoin [link] [comments]

1/16/2010 *Buys 20$ worth **Forgets and loses the key. New Liberty Standard.i

Let’s say I imagined this whole thing, I like to think so anyways. I was freshman in college and finally got that financial aide. My great aunt(73) tells me to buy 20$ worth. Della was a wise woman, god rest her soul. I remember just doing it. The thing is I was frustrated at the end. I don’t remember exact details but, some things I’m sure of. Some facts are still coming back to me the more time I spend remembering. I may of google’d bitcoin and found myself at a forum. Found this guy and then proceeded to email him. To make the purchase. I had never had as much money and was looking for something to invest into.
I may 90% sure the transaction may of completed.
I remember making a password, a really long one, and changing a few letters for numbers.
Paid the nice man via PayPal,
Received the coins, I hope.
I remember multiplying the “coins” by 1 cent, one nickel, dime and so on. I actually optimistically multiplies then by 1$ and laughed.
I remember looking at, what I know now to be a Private key, and getting frustrated that that’s all I had to represent my “imaginary intangible money,” upset I took a picture and stored the camera and a paper with the password in a drawer. I never considered anything of it until the bull run of 2017. Was convinced to find the coins but really doubted that reality was ever going to manifest.
Since then I have been casually looking into it, checked the laptop but it was wiped and idk much about computers. I constantly double think myself and wether my subconscious made the memories up. I been doing more research however, the more I think about it, the more I feel like it’s possible.
Well I figured out the date my great aunt told me to buy, it was 1/15/2010... This guy gets paypal balance increased 20$ the day after. Damn, say it ain’t so.
Can I restore the memory of that old laptop and recover the wallet? There’s only one wallet at that time and it’s bitcoin qt.
First I have to get the laptop back from my sister, we aren’t on talking terms anymore. Lol
Am I just forever going to think about this without any closure? Is this what crazy feels like?! Do you ever feel like you are living a movie script?!
P.s. you should know during this time I was super stoned as I just got my first plug that had quality and expensive herb. I was certainly lit during purchase and wallet creation .archived exchange site
submitted by ChaosChris1cR to CryptoCurrency [link] [comments]

Groestlcoin Release September 2018


As always, the past 3 months since 22nd June have been crazy busy. The bears might still be around, but the show must go on and of course has not slowed the Groestlcoin development team in the slightest. Here’s a quick overview of what has already happened since the last release: - Integrated into the bitbns exchange, with the ability to buy Groestlcoin directly with the Indian Rupee. - Groestlcoin Rebrand Vote – Whilst there was much talk and push for a rebrand vote, the overall result was almost unanimously in favour of keeping our unique and conversation-starting name. With just 83 votes to Rebrand, and 2577 votes to No Rebrand. Thank you for all who voted, the funds raised are being used to fund ongoing hosting and development costs. - Integrated into the Cryptobridge exchange. Cryptobridge is a popular decentralised exchange where you always hold the private keys to your funds, only YOU have access to them. - Groestlcoin has been added to SimpleSwap – Groestlcoin can now be swapped with over 100 other cryptocurrencies, without signing up! - Groestlcoin has been added to UnoDax, one of the leading cryptocurrency exchanges in India, with TUSD, BTC and INR trading pairs. - Groestlcoin has been added to, where you can buy Groestlcoin using Bitcoin and over 50 other altcoins. Purchasing with VISA/Mastercard is coming VERY SOON. Discussed later: - Groestlcoin has been listed on #3 largest exchange in the world on volume, Huobi Global! More on this to come further on in the announcements. - Groestlcoin has been added to the Guarda Multi-Currency Wallet. - Groestlcoin has been added to Melis Multi-Device, Multi-Account, Multi-Platform, Multi-Signature advanced wallet! Already this list is far more than most other cryptocurrencies have achieved in the past 3 months. But this is just the tip of the iceberg of what has been developed.

What's been Happening?

GRSPay Released

We are so excited for this, that it has it's own separate reddit thread. Head over there now at to see more on this!

Melis Wallet

The the most advanced wallet for Bitcoin, Bitcoin Cash, Litecoin and now Groestlcoin.
With Melis you have the complete control of your bitcoins and private keys, you can define spending limits policies and make use of two or more factors authentication. Melis is open source, published on GitHub.

How Melis Works?

You can create as many accounts as you want. An account is a part of your wallet that can be customised to your requirements. You can choose how many co-signers are required to spend funds. The accounts are completely independent and act like separate wallets from each other but can be accessed via the same details. A core feature of Melis is the ability to set a ‘primary’ device. With this you can set an account as ‘Secure’ so it is only viewable (and accessible at all) from the Primary device. You can have a savings account hidden from the outside world whilst also having your ‘spending’ funds available on the go. With Melis you can create a multi-signature account between N people, where up to N signatures are required to sign a transaction, choosing if any of those should be mandatory.
Core Features:

Guarda Wallet

Safer than ever! Desktop Light Wallet - Anonymous and fast!
With Guarda Multi-currency Desktop Light Wallet you don’t need to register. Guarda has no access to your private keys or funds. You can receive, send, store, buy and exchange cryptocurrencies in complete anonymity and safety. All these features are available on Linux, Windows or MacOS. Choose the one that suits you!
More info about Guarda wallet on

Integrated into HolyTransaction

What is HolyTransaction?

HolyTransaction gives users access to the crypto world with a universal cryptocurrency wallet and instant exchange.


For more information, visit Holy Transaction here.

Integrated into NEXT Wallet

What is NEXT?

NEXT is a modern, next-generation stylish open-source Desktop wallet.


For more information, visit NextWallet here.

Integrated into Blockchain Financial

What is Blockchain Financial?

Blockchain Financial is a set of web based services for individuals and companies that want to make things happen with the Cryptocurrencies Ecosystem. - For those that don't know anything about cryptocurrencies, we offer tools that will let them receive, send and operate with an assortment of coins. - For those that are already riding the wave, we offer tools that will let them do all those things that they weren't able to do.

Blockchain Financials mission

We're not here to reinvent the wheel. We're here to make it run smoother for you, and we provide some of the most useful services you'll find on the internet, made in a way that is easy to understand and use on a daily basis. In short, we're a bunch of people that claim to be Crypto Evangelists. We strongly believe in cryptocurrencies, and our main promise is to push them up so more people get involved and take all the advantages they offer.

More information from Blockchain Financial

Back in 2014, the world was taken by storm when Facebook approved the first cryptocurrencies tipping apps. The first was for Dogecoin, and the second was for multiple coins.
The project was hosted on, and persisted for almost two years, built up a massive user community and gave a home to Bitcoin, Litecoin, Dogecoin and dozens of other bitcoin-based altcoins.
After very active months, the tipping hype started to fade away. Then, the developers decided to jump into the next stage: bringing not only tipping, but also mining and a widget that could be embedded on websites to allow everyone to accept payments. Sadly, the work was never completed because the project started to require an unsustainable amount of resources. Then, in a painful decision, a shutdown was announced by December 2015.
A couple of months after was closed, the source code was released by its creator as Open Source on GitHub. But it wasn't maintained.
Now, some of the original members of the dev and admin teams gathered up with a handful of the WhitePuma's elite users, and decided to make something good with the best pieces of the old source code. That, with fresh new ideas and the power of the BardCanvas engine, synthesized the core of Blockchain Financial.
More info about Blockchain Financial wallet on .
For more information, visit [Blockchain Financial](

Groestlcoin Listed on Huobi

Who are Huobi?

Huobi was founded in China and is now based in Singapore, with offices in Hong Kong, South Korea, Japan and the North America, currently sitting #3 in volume on Coinmarketcap. Huobi is a great leap forward for our growing presence in Asia and we are very excited to be listed here!
You can find the official Huobi announcement here.

Groestlcoin Core v2.16.3 - Please Update ASAP

A new major Groestlcoin Core version 2.16.3 is now available for download which includes both a Denial of Service component and a critical inflation vulnerability, so it is recommended to upgrade to it if you are running a full Groestlcoin node or a local Groestlcoin Core wallet.
v2.16.3 is now the official release version of Groestlcoin Core. This is a new major version release with a very important security updates. It is recommended to upgrade to this version as soon as possible. Please stop running versions of Groestlcoin Core affected by CVE-2018-17144 ASAP: These are 2.13.3 and 2.16.0.
As a result in this, all exchanges and services have been asked to upgrade to this version, so please be patient if wallets go in to maintenance mode on these services.

What's new in version v2.16.3?

This is a major release of Groestlcoin Core fixing a Denial of Service component and a critical inflation vulnerability ( exploitable by miners that has been discovered in Groestlcoin Core version 2.13.3 and 2.16.0. It is recommended to upgrade to 2.16.3 as soon as possible. If you only occasionally run Groestlcoin Core, then it's not necessary to run out and upgrade it right this second. However, you should upgrade it before you next run it. If you know anyone who is running an older version, tell them to upgrade it ASAP. Stored funds are not at risk, and never were at risk. At this time we believe over half of the Groestlcoin hashrate has upgraded to patched nodes. We are unaware of any attempts to exploit this vulnerability. However, it still remains critical that affected users upgrade and apply the latest patches to ensure no possibility of large reorganizations, mining of invalid blocks, or acceptance of invalid transactions occurs.

The Technicals

In Groestlcoin Core 2.13.3, an optimization was added (Bitcoin Core PR #9049) which avoided a costly check during initial pre-relay block validation that multiple inputs within a single transaction did not spend the same input twice which was added in 2012 (Bitcoin Core PR #443). While the UTXO-updating logic has sufficient knowledge to check that such a condition is not violated in 2.13.3 it only did so in a sanity check assertion and not with full error handling (it did, however, fully handle this case twice in prior to Thus, in Groestlcoin Core 2.13.3, any attempts to double-spend a transaction output within a single transaction inside of a block will result in an assertion failure and a crash, as was originally reported. In Groestlcoin Core 2.16.0, as a part of a larger redesign to simplify unspent transaction output tracking and correct a resource exhaustion attack the assertion was changed subtly. Instead of asserting that the output being marked spent was previously unspent, it only asserts that it exists. Thus, in Groestlcoin Core 2.16.0, any attempts to double-spend a transaction output within a single transaction inside of a block where the output being spent was created in the same block, the same assertion failure will occur. However, if the output being double-spent was created in a previous block, an entry will still remain in the CCoin map with the DIRTY flag set and having been marked as spent, resulting in no such assertion. This could allow a miner to inflate the supply of Groestlcoin as they would be then able to claim the value being spent twice.
Groestlcoin would like to publicly thank Reddit user u/Awemany for finding CVE-2018-17144 and reporting it ( You deserve gratitude and appreciation from cryptoworld, and you have ours. If you want to support him for his work, please consider donating to him on his bitcoin cash address: bitcoincash:qr5yuq3q40u7mxwqz6xvamkfj8tg45wyus7fhqzug5

Groestlcoin Electrum-GRS 3.2.2 - Ledger & Trezor Edition

What is Electrum-GRS?
Electrum-GRS is a lightweight "thin client" groestlcoin wallet Windows, MacOS and Linux based on a client-server protocol. Its main advantages over the original Groestlcoin client include support for multi-signature wallets and not requiring the download of the entire block chain.


Electrum-GRS Mobile Android

What is Electrum-GRS Mobile?

Electrum-grs is a lightweight "thin client" groestlcoin wallet Android based on a client-server protocol. Its main advantages over the original Groestlcoin client include support for multi-signature wallets and not requiring the download of the entire block chain.


Groestlcoin EasyVanity Released

Groestlcoin EasyVanity is a Windows app is built from the ground-up in C# and makes it easier than ever before to create your very own bespoke Groestlcoin address(es), even whilst not connected to the internet! You can even generate multiple keys with the same prefix and leave it on overnight whilst your CPU or GPU collects and stores these addresses locally.
If you're tired of the random, cryptic addresses generated by regular groestlcoin clients, then Groestlcoin EasyVanity is the right choice for you to create a more personalized address.


• Ability to continue finding keys after first one is found • Includes warning on startup if connected to the internet • Ability to output keys to a text file (And shows button to open that directory) • Ability to make your match case sensitive (Where possible) • Show and hide the private key with a simple toggle switch, and copy the private key straight to your clipboard • Show full output of commands • Includes statistics whilst the application is running • Ability to choose between Processor (CPU) and Graphics Card (GPU) • Automatically detects 32 or 64 bit systems • Features both a Light and Dark Material Design inspired Themes • EasyVanity's search is probabilistic, and the amount of time required to find a given pattern depends on how complex the pattern is, the speed of your computer, and whether you get lucky. • EasyVanity includes components to perform address searching on your CPU (vanitygen) and your OpenCL-compatible GPU (oclvanitygen). Both can be built from source, and both are included in the Windows binary package. • Prefixes are exact strings that must appear at the beginning of the address. When searching for prefixes, Easyvanity will ensure that the prefix is possible, and will provide a difficulty estimate. • The percentage displayed just shows how probable it is that a match would be found in the session so far. If it finds your address with 5% on the display, you are extremely lucky. If it finds your address with 92% on the display, you are unlucky. If you stop EasyVanity with 90% on the display, restart it, and it finds your address with 2% on the display, your first session was unlucky, but your second session was lucky. • EasyVanity uses the OpenSSL random number generator. This is the same RNG used by groestlcoin and a good number of HTTPS servers. It is regarded as well-scrutinized. Guessing the private key of an address found by EasyVanity will be no easier than guessing a private key created by groestlcoin itself. • To speed up address generation, EasyVanity uses the RNG to choose a private key, and literally increments the private key in a loop searching for a match. As long as the starting point is not disclosed, if a match is found, the private key will not be any easier to guess than if every private key tested were taken from the RNG. EasyVanity will also reload the private key from the RNG after 10,000,000 unsuccessful searches (100M for oclvanitygen), or when a match is found and multiple patterns are being searched for. • Free software - MIT. Anyone can audit the code. • Written in C# - The code is short, and easy to review.

Groestlcoin Sentinel (Android & Blackberry) – Mainnet + Testnet

What is Sentinel?

Groestlcoin Sentinel is the easiest and fastest way to track/receive/watch payments in your offline Groestlcoin Wallets. Groestlcoin Sentinel is compatible with any standard Groestlcoin address, BIP44 XPUB (Extended Public Key) BIP49 YPUB and BIP84 ZPUB
Groestlcoin Sentinel is a great solution for anyone who wants the convenience and utility of a hot wallet for receiving payments directly into their cold storage (or hardware wallets). Sentinel accepts XPUB's, YPUB'S, ZPUB's and individual Groestlcoin address. Once added you will be able to view balances, view transactions, and (in the case of XPUB's, YPUB's and ZPUB's) deterministically generate addresses for that particular wallet.

What's New?

The P2SH paperwallet supports creating P2SH paperwallets in bulk, keypair generation with QR codes and sweeping tool. Groestlcoin believes strongly in privacy, the live version does not collect and store IP or transaction data.
The BECH32 paperwallet supports creating BECH32 paperwallets in bulk, keypair generation with QR codes and sweeping tool. Groestlcoin believes strongly in privacy, the live version does not collect and store IP or transaction data.

Groestlcoin Web Wallet Update 1.4

What is Groestlcoin Web Wallet?
Groestlcoin Webwallet is an open source, multisignature, HD Wallet and more! Webwallet is a a open source browser based Groestlcoin webwallet.
Webwallet is a playground for Groestlcoin in javascript to experiment with. It supports multisig, OP_HODL, RBF and many more. Groestlcoin believes strongly in privacy, the live version does not collect and store IP or transaction data.
submitted by Yokomoko_Saleen to groestlcoin [link] [comments]

Secure paper wallet tutorial

This is my handout for paranoid people who want a way to store bitcoin safely. It requires a little work, but this is the method I use because it should be resistant to risks associated with:
  1. Bad random number generators
  2. Malicious or flawed software
  3. Hacked computers
If you want a method that is less secure but easier, skip to the bottom of this post.
The Secure Method
  1. Download (Try going to the website and pressing "ctrl+s")
  2. Put the file on a computer with an operating system that has not interacted with the internet much or at all. The computer should not be hooked up to the internet when you do this. You could put the bitaddress file on a USB stick, and then turn off your computer, unplug the internet, and boot it up using a boot-from-CD copy of linux (Ubuntu or Mint for example). This prevents any mal-ware you may have accumulated from running and capturing your keystrokes. I use an old android smart phone that I have done a factory reset on. It has no sim-card and does not have the password to my home wifi. Also the phone wifi is turned off. If you are using a fresh operating system, and do not have a connection to the internet, then your private key will probably not escape the computer.
  3. Roll a die 62 times and write down the sequence of numbers. This gives you 2160 possible outcomes, which is the maximum that Bitcoin supports.
  4. Run from your offline computer. Input the sequence of numbers from the die rolls into the "Brain Wallet" tab. By providing your own source of randomness, you do not have to worry that the random number generator used by your computer is too weak. I'm looking at you, NSA ಠ_ಠ
  5. Brain Wallet tab creates a private key and address.
  6. Write down the address and private key by hand or print them on a dumb printer. (Dumb printer means not the one at your office with the hard drive. Maybe not the 4 in 1 printer that scans and faxes and makes waffles.) If you hand copy them you may want to hand copy more than one format. (WIF and HEX). If you are crazy and are storing your life savings in Bitcoin, and you hand copy the private key, do a double-check by typing the private key back into the tool on the "Wallet Details" tab and confirm that it recreates the same public address.
  7. Load your paper wallet by sending your bitcoin to the public address. You can do this as many times as you like.
  8. You can view the current balance of your paper wallet by typing the public address into the search box at
  9. If you are using an old cell phone or tablet do a factory reset when you are finished so that the memory of the private keys is destroyed. If you are using a computer with a boot-from-CD copy of linux, I think you can just power down the computer and the private keys will be gone. (Maybe someone can confirm for me that the private keys would not be able to be cached by bitaddress?)
  10. To spend your paper wallet, you will need to either create an offline transaction, or import the private key into a hot wallet. Creating an offline transaction is dangerous if you don't know what you are doing. Importing to a client side wallet like Bitcoin-Qt, Electrum, MultiBit or Armory is a good idea. You can also import to an online wallet such as or Coinbase.
The only thing you need to do is to honestly convert the brainwallet passphrase into the corresponding private key and address. You can verify that it is doing this honestly by running several test passphrases through the copy of bitaddress that you plan on using, and several other brainwallet generators. For example, you could use the online version of bitaddress, and brainwallet and safepaperwallet and bitcoinpaperwallet. If you are fancy with the linux command line, you can also try "echo -n my_die_rolls | sha256sum". The linux operating system should reply with the same private key that bitaddress makes. This protects you from a malicious paper wallet generator.
Trusting your copy of
Bitaddress publishes the sha1 hash of the website at this location:
The message is signed by the creator, pointbiz. I found his PGP fingerprint here:
"527B 5C82 B1F6 B2DB 72A0 ECBF 8749 7B91 6397 4F5A"
With this fingerprint, you can authenticate the signed message, which gives you the hash of the current file. Then you can hash your copy of the file and authenticate the file.
I do not have a way to authenticate the fingerprint itself, sorry. According to the website I linked to, git has cryptographic traceability that would enable a person to do some research and authenticate the fingerprint. If you want to go that far, knock yourself out. I think that the techniques described in this document do not really rely on bitaddress being un-corrupt. Anyway, how do we know pointbiz is a good guy? ;-)
There are a lot of skilled eyes watching and the signed sha1 hash. To gain the most benefit from all of those eyes, it's probably worthwhile to check your copy by hashing it and comparing to the published hash.
"But we aren't supposed to use brainwallets"
You are not supposed to use brainwallets that have predictable passphrases. People think they are pretty clever about how they pick their passphrases, but a lot of bitcoins have been stolen because people tend to come up with similar ideas. If you let dice generate the passphrase, then it is totally random, and you just need to make sure to roll enough times.
How to avoid spending your life rolling dice
When I first started doing this, I rolled a die 62 times for each private key. This is not necessary. You can simply roll the die 62 times and keep the sequence of 62 numbers as a "seed". The first paper address you create would use "my die rolls-1" as the passphrase, the second would be "my die rolls-2" and so on. This is safe because SHA256 prevents any computable relationship between the resulting private key family.
Of course this has a certain bad security scenario -- if anyone obtains the seed they can reconstruct all of your paper wallets. So this is not for everyone! On the other hand, it also means that if you happen to lose one of your paper wallets, you could reconstruct it so long as you still had the seed.
One way to reduce this risk is to add an easy to remember password like this: "my die rolls-password-1".
If you prefer, you can use a technique called diceware to convert your die rolls to words that still contain the same quantity of entropy, but which could be easier to work with. I don't use diceware because it's another piece of software that I have to trust, and I'm just copy/pasting my high entropy seed, so I don't care about how ugly it is.
Why not input the dice as a Base 6 private key on the Wallet Details tab?
Two reasons. First of all, this option requires that you roll the die 99 times, but you do not get meaningful additional protection by rolling more than 62 times. Why roll more times if you don't have to? Second, I use the "high entropy seed" method to generate multiple private keys from the same die rolls. Using the Base 6 option would require rolling 99 times for every private key.
I'm a big nerd with exotic dice. How many times to roll?
Put this formula in Excel to get the number of times to roll: "=160*LOG(2,f)" where f = number of faces on the die. For example, you would roll a d16 40 times. By the way, somewhat unbelievably casino dice are more fair than ordinary dice
The "Change address" problem:
You should understand change addresses because some people have accidentally lost money by not understanding it.
Imagine your paper wallet is a 10 dollar bill. You use it to buy a candy bar. To do this you give the cashier the entire 10 dollar bill. They keep 1 dollar and give you 9 dollars back as change.
With Bitcoin, you have to explicitly say that you want 9 dollars back, and you have to provide an address where it should go to. If you just hand over the 10 dollar bill, and don't say you want 9 dollars back, then the miner who processes the transaction gives 1 dollar to the store and keeps the remainder themselves.
Wallet software like Bitcoin-Qt handles this automatically for you. They automatically make "change addresses" and they automatically construct transactions that make the change go to the change address.
There are three ways I know of that the change problem can bite you:
  1. You generate a raw transaction by hand, and screw up. If you are generating a transaction "by hand" with a raw transaction editor, you need to be extra careful that your outputs add up to the same number as your inputs. Otherwise, the very lucky miner who puts your transaction in a block will keep the difference.
  2. You import a paper wallet into a wallet software and spend part of it, and then think that the change is in the paper wallet. The change is not in the paper wallet. It is in a change address that the wallet software generated. That means that if you lose your wallet.dat file you will lose all the change. The paper wallet is empty.
  3. You import a paper wallet into a wallet software and spend part of it, and then think that the change is in the change address that the wallet software generated. If the transaction did not need to consume all of the "outputs" used to fund the paper wallet, then there could be some unspent outputs still located at the address of the paper wallet. If you destroyed the paper wallet, and destroyed the copy of the private key imported to the wallet software, then you could not access this money. (E.g. if you restored the software wallet from its seed, thinking all of the money was moved to the wallet-generated change addresses.)
For more on this, see here
The hot paper wallet problem
Your bitcoin in your paper wallet are secure, so long as the piece of paper is secure, until you go to spend it. When you spend it, you put the private key onto a computer that is connected to the internet. At this point you must regard your paper wallet address as hot because the computer you used may have been compromised. It now provides much less protection against theft of your coins. If you need the level of protection that a cold paper wallet provides, you need to create a new one and send your coins to it.
Destroying your paper wallet address
Do not destroy the only copy of a private key without verifying that there is no money at that address. Your client may have sent change to your paper wallet address without you realizing it. Your client may have not consumed all of the unspent outputs available at the paper wallet address. You can go to and type the public address into the search window to see the current balance. I don't bother destroying my used/empty paper wallet addresses. I just file them away.
Encrypting your private key
BIP 0038 describes a standardized way to encrypt your paper wallet private key. A normal paper wallet is vulnerable because if anyone sees the private key they can take the coins. The BIP38 protocol is even resistant to brute force attacks because it uses a memory intensive encryption algorithm called scrypt. If you want to encrypt your wallets using BIP38, I recommend that you use bitcoinpaperwallet because they will let you type in your own private key and will encrypt it for you. As with bitaddress, for high security you should only use a local copy of this website on a computer that will never get connected to the internet.
Splitting your private key
Another option for protecting the private key is to convert it into multiple fragments that must be brought together. This method allows you to store pieces of your key with separate people in separate locations. It can be set up so that you can reconstitute the private key when you have any 2 out of the 3 fragments. This technique is called Shamir's Secret Sharing. I have not tried this technique, but you may find it valuable. You could try using this website which will help you split up a key. As before, you should do this on an offline computer. Keep in mind if you use this service that you are trusting it to work properly. It would be good to find other independently created tools that could be used to validate the operation of passguardian. Personally, I would be nervous destroying the only copy of a private key and relying entirely on the fragments generated by the website.
Looks like Bitaddress has an implementation of Shamir's Secret Sharing now under the "Split Wallet" tab. However it would appear that you cannot provide your own key for this, so you would have to trust bitaddress.
Durable Media
Pay attention to the media you use to record your paper wallet. Some kinds of ink fade, some kinds of paper disintegrate. Moisture and heat are your enemies.
In addition to keeping copies of my paper wallet addresses I did the following:
  1. Order a set of numeric metal stamps. ($10)
  2. Buy a square galvanized steel outlet cover from the hardware store ($1)
  3. Buy a sledgehammer from the hardware store
  4. Write the die rolls on the steel plate using a sharpie
  5. Use the hammer to stamp the metal. Do all the 1's, then all the 2's etc. Please use eye protection, as metal stamp may emit sparks or fly unexpectedly across the garage. :-)
  6. Use nail polish remover to erase the sharpie
If you trust electrum you might try running it on an offline computer, and having it generate a series of private keys from a seed. I don't have experience with this software, but it sounds like there are some slick possibilities there that could save you time if you are working with a lot of addresses.
Message to the downvoters
I would appreciate it if you would comment, so that I can learn from your opinion. Thanks!
The Easy Method
This method is probably suitable for small quantities of bitcoin. I would not trust it for life-altering sums of money.
  1. Download the website to your hard drive.
  2. Close your browser
  3. Disconnect from the internet
  4. Open the website from your hard drive.
  5. Print a paper wallet on your printer
  6. Close your browser
submitted by moral_agent to BitcoinWallet [link] [comments]

need help recovering my wallet.

So i bought some coins thru coinpal in 2011. I have the email which contains the bitcoin address that the coins were sent to, at some point in 2012 or something, i lost interest in bitcoin. reformatted and repurposed the drives, etc. but i did backup my wallet files, and after searching i found a wallet.dat file that is compatible with the old bitcoin qt client
under the recieve tab, it shows 3 addresses, one of which has no label, The second has the address contained in the email from coinbase, and the third has another address that i believe i had sent coins to at some point.
The two "labels" i can search on and they both have a balance. HOWEVER.. when you right click copy address, it copes an entirely different address.
this address has a zero balance. in all 3 spots.
So ive tried importing the wallet into bitcoin core, it does not show anything, so i know this is an older file created by the older bitcoin qt client.
ive run several commands in the debug console, trying to dump the private keys, but for some reason the wallet file i have does not contain the private keys for the two addresses that have coins.
I had someone trying to help me but he says the wallet is encrypted.
so i opened the debug console and tried to unlock the wallet using the passphrase i think i would have used, and it tells me that the wallet is not encrypted
which makes sense because i remember specifically not encrypting the wallet because i always forget passwords.
Whats weird is, how did these addresses get put into the label section of the recieveing tab? i know for a fact that one of them which contains 2btc i could have manually entered myself, because i do have a record of the address on my email from coinpal.
the second one tho, i have no idea where i would have found the address. They both have one transaction right around the same time, and they both have a balance. one of 2btc, one of .4 btc. the transaction dates line up to when i bought the coins.
im having data recovery done on my hard drives at this point to look for more bitcoin wallets, because im pretty sure i had more bitcoins in there as well. at least 6 or 8 more that i can remember.
So is it possible that the wallet file is corrupt? if so is it repairable?
or is it more liekely that ADDRESSES listed in the recieve tab are the actual addresses contained in the wallet file, and the labels are something else? im ripping my hair out trying to figure this out.. I have a wallet file. it has 2 addresses listed which i can verify both have a balance, but i cannot gain access.
i remember in 2011 buying some coins, and like the next day my computer crashed and got stuck in a boot loop so i had to reformat. and i remember backing up my wallet on a flash drive, and trying to restore it and the coins not showing up even after the blockchain loaded.
i have not yet finished loading the blockchain on my bitcoin qt app, so maybe that has somethign to do with it, but i find it odd that these addresses do not have the correct private keys.
any ideas?
submitted by cttigwelder to Bitcoin [link] [comments]

Have I missed any steps trying to recover an old wallet?

I found an old wallet.dat from 2012 on one of my hard drives with bitcoin qt 0.7.0. I made a backup of the wallet.dat to my current computer.
I downloaded the newest version of Bitcoin Core and let it sync the entire blockchain. When it was done, I closed Core, deleted the wallet file that it put in the folder, and replaced it with my backup. I reopened Core with the -rescan and -upgradewallet parameters. It said 0 bitcoins.
I checked the receive address on and that said 0 too. I went back to the old hard drive and opened bitcoin qt 0.7.0 and it said 0. I copied that receive address into and it said 0.
The thing I'm wondering about is the receive address in 0.7.0 was different than the one in Bitcoin Core after I restored the old wallet.. is that normal?
Anyway, not sure if I actually had any bitcoins to begin with, but wanted to make sure I did everything I could to double-check?
submitted by Dutchmast88 to BitcoinBeginners [link] [comments]

A few thoughts - Thursday, June 5, 2014

Today's thoughts:


Welcome! Yesterday, there was quite a discussion in /bitcoinmarkets. As I told Kibubik, after the discussion erupted it became untenable for me to continue posting these thoughts there, because no matter what was said, someone would say it was off-topic and another huge discussion would follow.
But that's fine. People who want to visit /bitcoinmarkets can continue to do so, and those who want to read these posts can come here (or do both). I'll still read all the bitcoin forums.
If you want to post your thoughts, then feel free to create a new topic. Feel free to talk about anything about cryptocurrencies; it doesn't have to do with markets. Make sure your post has some content and isn't just a link with a direction to "discuss." As long as most of your post is about cryptocurrencies, you can also add comments on other stuff, too. Consider this a multi-person blog; we'll see if anyone is interested in posting.

It is unbelievably difficult to retain data (and wallets)

Retaining data for a long time is unbelievably difficult. Over the past four years, I have had two instances where costly catastrophes have ensued. In the first case, I was restoring a large amount of data from a backup when the backup array also failed, so I had to pay $1500 for data recovery (but all the data was restored). In the second case, despite using a RAID-6 with every piece of data backed to six external drives, the array got corrupted and one of the external drives had unrecoverable read errors on it. I was again able to restore all the data because the only corrupted files were one CD I had ripped, which was easily replaceable. But it took almost 2 months each time before the system was back.
If you are trying to come up with a system to store a bitcoin wallet, security is important, but actually retaining the wallet is even more important. People may not know that the average hard drive lasts only a little longer than three years, but we'll round down to 3 for easy math. If you make three copies onto three independent disks made by different manufacturers at the same time, and you don't constantly verify that the disks work, then the odds of losing all your money is as high as 1/8!
To make things worse, there are things called unrecoverable read errors, which can occur when a disk still spins but only the sector where your wallet is stored can't be read. These errors are so common that they occur every 10 terabytes of writes or so, which means that a 2TB disk only needs to be overwritten five times before you are more likely than not to have these errors in them.
Making one backup is not enough. If you are trying to secure a wallet for cold storage, encrypt it with a long password, and then store it on five disks.
By the way, as I said in a post yesterday, evoorhees, the guy recently fined by the SEC, had three backups of his wallet at one point, but he still lost 10,000 bitcoins ($6.5m) because none of the backups were working.

Trading is possible, but not the most profitable

greenearplugs has been very vocal lately about how he believes that it is impossible to beat the averages. I agree with him when he says that daytrading is not a better strategy than buy-and-hold. But that is not the same as saying that you can't make money if you sit in front of your computer all day.
This Sunday was a perfect example of a time when you could have made easy money. Bitcoins are so volatile that a good plan is to buy every time there is a huge crash, and to sell immediately thereafter, because there is almost always a recovery within a few hours. You can make money this way - I tried this on paper.
But when you look at the results, you notice that there are a lot of trades that look like: huge crash at $339, buy, then sell at $450. Huge crash at $630, buy, sell at $660, and so on. It's easy to make money this way, but you can make a lot more money if you didn't sell at all, and you don't get killed by fees that way.

Trading on the bubble cycle is the only more profitable strategy than buy and hold

I propose that trading on the bubble cycle is the only strategy more profitable than simple buy and hold. Bubbles are so predictable and so dramatic that you don't have to sell at the top and buy at the bottom to make money. You don't have to sit in front of a screen all day; just buy and sell at 6 and 2 month intervals.
As I discussed with moral_agent yesterday, people should be looking at what the next bottom is, 7 months out from now, not what the next top is going to be. Everyone knows that if bitcoins rise to $5k this summer it will be a bubble, not a "new paradigm." If you are conservative and sell at $2.5k, and then put all that money back in whenever the news looks to be the absolute worst the next time around, you'll probably still be ahead.
If you look at the charts, you'll notice that you could even have made money by panic selling during the initial bubble crash, and then coming back six months later - so you don't even have to be worried whether this actually is the "new paradigm" or not. The biggest concernto be worried about is not buying in much above the all-time high of the previous cycle.

The 1MB transaction limit is about freedom

There are some users who take the position that not only does nothing need to be done about the 1MB transaction limit, but that even if something could be done, no action should be taken. They are wrong.
This limit is important because it restricts the ability of people to send bitcoins without dependence on others. It is possible that services like Coinbase will provide free transactions. But in jurisdictions like China, where bitcoin services are likely to be permanently banned, people will need to be able to install the bitcoin-qt client directly and sign their own transactions. If fees rise too high, then it will become impossible for people in dictatorships like China to work around their governments' regulations.
Centralization is one solution to this problem, but centralization significantly degrades one of the core promises of bitcoins - to allow anyone to send money to anyone without relying on the government.

Bubbles aren't that complicated

People are now starting to talk about bubbles as if they have five or seven phases. To me, it seems that this is just curve-fitting taken to the extreme. If one looks hard enough, (s)he can find patterns in just about any data.
The three-phase bubble cycle (down, steady, up) is a much more simple and accurate model than trying to separate bubbles into seven phases. Not only that, but the first few bubbles don't fit the seven-phase cycle, making this model have little support.


submitted by quintin3265 to BitcoinThoughts [link] [comments]

Update: Retrieving coins

Alright here's where I'm at. I have the wallet.dat file, and I have a file labeled multibit.key (which I'm assuming has to do with bitcoin, not doge). I didn't have the Dogecoin-QT app on my computer anymore but I did have a backup of my computer so I restored the app and now have it open but it is not syncing. According to the ELI5 that doesn't matter though. It says in recent transactions I tried to send out all of my doge to my reddit account but since it wasn't synced I don't know if that went through (although balance says 0). I tried using the help-debug-console where you do dumpprivkey "address" and it says that "Private key for address 'address' is not known (code -4)". I forgot to unlock before trying to get the private key. I now have my private key, but when I try to import to MultiDoge it wants a file instead of pasting the private key in. Would anyone know where to go from here? I used dogechain to import private key and it now shows full balance. I think I did it? Yep, I did it. Keeping the post up for future searches, hopefully it helps someone else.
Side question: Since the old dogetipbot is gone I can no longer access history or balance, what happened to the doge I had in that account? Is there a way I can access it?
submitted by JamrJim to dogecoin [link] [comments]

how to restore wallet.dat from 2011?

Hello friends,
I'm not new to this in the sense that my wallet.dat is very old, but it comes from another computer and right now I don't have a fully syncronised bitcoin node. Back then bitcoin-qt didn't support wallet encryption and so it's plaintext. I've been having some trouble restoring the wallet.dat in to a functioning bitcoin node. Any advice?
submitted by samphippen to Bitcoin [link] [comments]

Backup Wallet.dat

"1) I can backup my wallet by exporting a wallet.dat file. Do I have to do this everytime I receive more BBP? Or just whenever I add a new key? 2) How do I add new keys? 3) Can I generate and see the private key so that I can write it down/print it and store it somewhere safe?" -znffal
1) think of your wallet.dat file as your passbook in a passbook savings account. You have to have that .dat file to be able to access (and prove you SHOULD have access) to the BBP stored in your account addresses. Exporting it once is all you need.
2) Adding new keys? The passphrase (password) you use is the only "key" you would have in an encrypted wallet (besides the .dat file). If you mean new addresses, you can get those by going under File and Sending (or Receving) Addresses and hit "new".
3) Clicking Encrypt Wallet will be where you choose a passphase, I don't know you can see it other than when you enter it.
To put a real world example or two.
Example One: You don't ever encrypt or backup your wallet. If I borrowed/stole/hacked your computer, I could send all your coins to my wallet (no passphrase).
Example Two: You encrypt your wallet with the passphrase "secret" but don't backup the wallet.dat file, then your computer crashes and you lose all your data. Since you didn't have a copy of the wallet.dat file, your coins would be lost.
Example Three: You backup your wallet.dat but don't encrypt it. Your computer crashes and all your data is lost, but you re-download the QT program, restore your wallet.dat, all your coins are still in you wallet. But if you lose your USB drive that has the wallet.dat on it, and I find it, I can put your wallet.dat on another computer and send all your coins to my wallet.
Example Four: You encrypt your wallet and back up the wallet.dat file. If I hack/borrow your computer, unless I guess your passphrase your coins are safe. If you computer crashes, your can restore your wallet.dat file to another computer and your coins are safe.
In short, Encrypt your wallet (passpharse) and then backup (copy) the wallet.dat file to at least two locations." -616westwarmoth
"Find your wallet.dat file, copy it to a flash drive or any other secure place. If your computer crashes, you'll always have the wallet.dat and can put it on a new machine. It will have to resync a bit when you do, but you'll never lose your "key" to the wallet. Speaking of keys, you should password protect your wallet and make sure to remember it!"
"Yes you must have a copy of the wallet.dat somewhere. So multiple back up copies are a good idea. If you lose the wallet.dat file the coins will be in limbo but there will be no way to recreate the file. One thing to remember is it doesn't matter if the wallet.dat file is "current", it can be 10 years old on a flash drive and you can download a new client, put the wallet.dat file into the machine and you'll be good." -616westwarmoth
"In addition to this, whenever you reboot the node after more than 24 hours of being synced, we back your wallet.dat up into the "backups" folder. This is useful if you ever accidentally delete your wallet.dat.
Also, if you want a paper backup, you can do a 'dumpprivkey accountaddress' command from the RPC." -Rob
"wallet is a collection of private keys"
"there are other ways to achieve high security. You can make a new wallet, encrypt it with a long password, send coins to it, put it on a flash drive and put it in cold storage, then download the hard drive cleaning program and erase the wallet.dat sectors from your PC. And of course, keep a printed copy of the private key on paper and put it in a safe. Put the usb in the safe also. Burn a cd rom with the wallet.dat file and put it in the safe." -Rob
How to safely back up your wallet
Keep Your Crypto #SAFU (CZ's Tips)
To Read:
NOTE: As of version we have updated to HD wallets, so you should not need to worry about keypools anymore if you have upgraded
"Regarding the Sanctuary, you receive payments always to the same address (key), so the keypool is not consumed for those payments. But when you click to generate a new address on the "Receive" tab, one key will be deducted from the keypool. Also, sometimes new addresses are automatically generated and the keypool is consumed, for example when solo mining and finding a block, a new address could be used for the block reward.
You can always check your current keypool size by typing "getwalletinfo" in the RPC console and see "keypoolsize" and "keys_left". It's only concerning if they are a low number and you plan to generate new addresses in your wallet. They start from 1000. If the number gets too low, you can just type "keypoolrefill" to refill them back to 1000 and then you should backup the wallet. But from my experience the wallet automatically refills the keypool from time to time (or after certain actions like transactions), because I see that my wallet file keeps getting larger and the "keys_left" returns to 1000.
The only issue is if you actively use your wallet on multiple computers (for example cloud mining or simply sometimes using the wallet on your laptop), then one wallet could refill the keypool with new addresses and the other one will not, or they will generate different new addresses. If I understand this correctly, for example, you could receive a payment on a new address generated in one wallet; your old balance will be there on both wallets, but only the one wallet where you generated the new address would show the new payment. Then you should copy the wallet.dat file to other computers, to update them.
If you use the wallet on just one computer, you should just backup the wallet from time to time (or when you see it has increased in size). Qt also backups wallet.dat automatically, those can be found in the folder %AppData%\BiblepayCore\backups, you will see that they also have timestamps in their names and possibly different sizes." -inblue
submitted by togoshige to BiblePay [link] [comments]

bitcoin cor backup

as beginner I am familiarising with bitcoin pro wallet. I created wallet and paid in vary small bc amount. the generated backup file. I created wallet on different comp.and tried to restore backup by placing wallet dat in qt installation folder. however new wallt remained empty. I then tried QT rescan but wallet is still empty. can anyone explain how to use wallet.dat backup file to restore wallet on different computer (all win 7 pro.) using latest blockchain 14
submitted by jimplinge to BitcoinBeginners [link] [comments]

The Monero Missives (weekly report) - June 10th, 2014

Original post is here
Monero Missives
June 10th, 2014
Hello XMR users! Welcome to our second Monero Missives.
Major Updates
  1. We're happy to introduce a major new feature for Monero: deterministic wallets based on a mnemonic seed! When creating a new wallet you now get a 24 word seed that you can use to restore the wallet. Usage: This affects simplewallet, and is the default behaviour for --generate-new-wallet. If you would like to disable the deterministic seed during wallet generation, you can pass the --non-deterministic flag. To restore from a seed you can use the --restore-deterministic-wallet flag. This provides a MAJOR benefit in that backing up your wallet no longer requires backing up the .bin.keys file! All you have to do is write down the 24 words and that's the only backup you need. If you're particularly brave you can even memorise the 24 words. You can also use this to create an offline cold wallet or a paper wallet: create a wallet on a computer disconnected from the Internet, write the 24 words and the address and the view key down, and then remove all the files created by the wallet. Security notes: Please note that this key is independent of your password. By default the 24 word key is written to simplewallet.log when the wallet is created. This is the expected behaviour, the next release will both exclude this from the log and reduce the default log level. Please run --generate-new-wallet with the --set_log 0 flag, or alternatively make sure to delete the simplewallet.log file afterwards. Technical details: The key length for this remains 256-bits and thus does not compromise user security. The view key seed is generated from a keccak1600 hash of the spend key (which is directly from the mnemonic seed), hence the deterministic nature of this. The non-deterministic method is still available as an option. How to get it: binaries in the OP have already been updated, or you can compile from the source on github. Moving to a deterministic wallet: unfortunately it's not possible to retroactively make an existing wallet deterministic. If you want to take advantage of the new feature, you will have to create a new wallet and move your funds in there.
  2. XMR is now on Mintpal for voting. You can find the voting link here: - Mintpal allows 1 vote an hour from registered users who have traded before, as well as paid-for votes.
  3. Monero will be officially represented by fluffypony at the Bitcoin Supernode Conference at Malla Castle in Estonia at the end of this month.
  4. Neozaru has made great strides in his RPC-based Qt GUI wallet, and it requires some testing. If you are keen on trying it out, head over to his comment the GUI thread, give it a spin, and give him feedback.
Dev Diary
RPC: incoming_transfers is now available as a simplewallet RPC API call, and payment_id has been added as an optional argument to the transfer RPC API call. Neozaru also committed a large amount of additional functionality to the RPC API, including progress estimation to getinfo.
I2P: no commits this week, much of the work has been around scoping and planning the RPC subsystem.
Core: new seed nodes have been added, so bootstrapping on cold start should work just fine. We are going to add DNS seed node bootstrapping at a later stage.
Docs: work has begun on adding Doxygen comments throughout the code. This will both help us to understand the code written by "The CryptoNote Developers" (who appear at the top of every piece of source code except for the epee library), but will also result in proper developer documentation being made available.
Mining: Wolf` has continued to improve his CPU miner - the latest copy of which can be found on his github repo.
Mining: Claymore released a CryptoNight GPU miner, which you can find at this thread. Please be advised that his miner is currently closed source, and the appropriate level of caution should be exercised.
Until next week!
PS. If you've made it this far, there's a reward in the example wallet listed in the screenshot - first to grab it gets the prize!
submitted by fluffyponyza to Monero [link] [comments]

[Help] [Question] I had to erase MBP and couldn't restore from time machine. Now I need help retrieving my old wallet info?

As stated I had problems with my MBP and had to do a clean restore. I then couldn't restore it from my backup on my time machine but instead had to pull the individual files from the backup. I need help finding a way to retrieve my old wallet and I believe I have a .dat backup? I do have the Bitcoin-QT wallet and I don't want it to start up and sync till I know how to retrieve my old wallet info. Any help would be greatly appreciated. Also just in case the .dat file isn't any help is there a way to pull it from my time machine backup?
[Edit] I have located the new wallet.dat file and Bitcoin folder and added the Bitcoin-QT Backup.dat file in there but haven't done anything with it yet. I am thinking about going ahead and running the Bitcoin-QT wallet and let it sync and see what happens.
[Edit] (Update) After posting on here and I had enough people come together and had different ideas to figure it all out. So my folder was hidden from plain sight and had to use the command+shift+[G] keys to see my hidden Bitcoin folder. Once I was in that folder I entered into time machine and the same exact folder came up and I went to the last backup before my computer got restored and copied those files and pasted those into the Bitcoin folder created after opening up Bitcoin-QT again to do a fresh sync.
So I deleted the new files and added my old files from my backup and then opened up Bitcoin-QT and it started to process and verify blocks. Once it opened up it had to sync all my data back on and showed my account balance from what I had prior to this whole ordeal. Now I wasn't sure it was going to work so it spent all night reindexing and syncing the blockchain and finally finished this morning. Once it finished I closed the wallet down and reopened it and it came right back to my wallet. So I am thankful for all the help and appreciate the bitcoin community for this. As I am sure everyone knows it can be kind of stressful to have to deal with something like this but luckily there are files and backups that help prevent anyone from losing the wallet completely.
I will now make sure I backup the wallet every month or so if not more often. This is one thing that I believe scares people from using bitcoins because it is easy to lose your wallet/BTC if you don't know what you're doing. I am looking into the Electrum wallet as well to see if I actually like that one. Thanks again for your help.
submitted by caosborne to Bitcoin [link] [comments]

A helpful discussion about wallet security (esp. Electrum)

I was recently contacted via private message by a redditor who read a comment of mine about wallet storage (I assume this comment). I think there was quite a bit of useful information in it for other bitcoin beginners, so I am reposting it here in full (with permission). The redditor in question wanted to remain anonymous though.
I hope this is of use to some of you here!
From: Anonymous Redditor
I saw your post regarding your wallet storage and had a few noob questions if you don't mind.
My plan is similar to yours but I was unsure whether to use armory or electrum (electrum's seed creation scares me a bit).
You mentioned you have a bootable LINUX (ubuntu?) USB stick that you keep your wallet you only boot this onto an always offline computer?
Do you use something like Truecrypt to further protect your wallet.dats?
Thanks for your time!
From: SanderMarechal
My plan is similar to yours but I was unsure whether to use armory or electrum (electrum's seed creation scares me a bit).
For me it is the other way around. Armory (and bitcoin-qt) scare me. Armory is just a wallet. It still needs bitcoin-qt running in the background. For me the problem is two-fold:
1) Size
bitcoin-qt (and armory) need to download the entire blockchain. That 13+ GB that takes hours to download and days to verify. And if you ever lose it, you need to do it again.
2) Random keys
armory and bitcoin-qt generate random private keys. You get 100. If you use a few (you use them when you send coins for example) then new ones are created. So, if you create an armory wallet and make a backup, that backup will have 100 keys. Then, if you make 33(!) transactions, your 100 keys are used up and you will have 100 different random keys. If someone then steals your computer (or your house burns down) then you cannot use your backup anymore. It only has the 100 old keys and none of the new keys. So you have lost all your bitcoins.
Why 33 transactions and not 100? Because of change addresses. If you have 10 BTC and send me 2 BTC then most wallets will create 2 transactions. 2 BTC from your old addres to me, and 8 BTC from your old address to a new (random) address. This process costs 3 private keys. 2 keys for the transactions and 1 key to create a new address.
This means that after every few dozen transactions you need to refresh your backup so it has the newer keys. For me that is impractical. It means that I need to keep my backup close by because I often need it.
Electrum does not have this problem. The seed solves this. Private keys are not random but are created from the seed. If you have the seed then you have, by definition, all the private keys you will ever need. Your backup can never be out-of-date. This is easy for me. I save the seed in a file, encrypt it, put it on an USB stick and give copies to a few family members who have safes in their homes.
If my computer is ever stolen, or my house burns down, I can go to a family member, decrypt the seed file and use the seed to restore my electrum wallet. Even if that USB stick is 10 years old.
You mentioned you have a bootable LINUX (ubuntu?) USB stick that you keep your wallet you only boot this onto an always offline computer?
It depends on how secure you want to be. For maximum security, keep the computer always offline. But if you want to spend the bitcoins from your wallet, you will need to be online.
I use the USB stick for my savings account. It only receives coins and I do not send. So I do not need to boot up my USB stick. I have created a second wallet on that I use for day-to-day transactions. All BTC I receive goes to my blockchain account. Then I transfer a part of that to my savings account and only keep a bit of change that I need in the blockchain account.
Do you use something like Truecrypt to further protect your wallet.dats?
No. Electrum does not have a wallet.dat. It has the seed. I simply copy the seed to a TXT file and encrypt it using GPG and symmetric encryption. Example:
gpg --armor --symmetric --cipher-algo AES256 seed.txt 
Make sure you use a password that is strong and that you cannot forget! If you need to write the password down on paper and your house burns down, then you cannot decrypt the seed anymore!
From: Anonymous Redditor
Forgive the naivety here: Correct me if I'm wrong - The safest way to generate your wallet seed is on an offline computer correct? So, theoretically, generate the seed on an offline-only computer, copy to txt...encrypt. back up on multiple USB's. Then on your online computer, load electrum and import Seed?
Thanks so much for the thorough explanation! I'm a potato when it comes to reddit's bitcoin tip bot. Send me an address - would like to send some internet magic money your way.
From: SanderMarechal
The safest way to generate your wallet seed is on an offline computer correct? So, theoretically, generate the seed on an offline-only computer, copy to txt...encrypt. back up on multiple USB's. Then on your online computer, load electrum and import Seed?
Not quite. The risk with an online computer is malware and people breaking in. If you generate the seed on an offline computer and then move it to an online computer, you don't really take that risk away. You still have your wallet on an online computer which you use for day-to-day work and which is exposed to hackers and malware.
I suggest you make two wallets. One wallet is your "savings" wallet. You can use the USB stick Linux for this. Generate the wallet offline, backup and encrypt the seed onto multiple USB sticks and note down the bitcoin address somewhere so you can transfer funds to it. The only time you should use the USB stick to go online is when you want to transfer funds out of your savings wallet.
The, on your normal computer (or your smartphone if you prefer), create a second wallet using a different password. This is the wallet you keep only a little money in for your day-to-day transactions. Note down the seen, encrypt (with a different password than you used to encrypt the seed from your savings wallet) and add it to the USB keys. You can use Electrun for this second wallet as well, but you can also use something different. I use a wallet for my day-to-day expenses.
Whenever you have a larger amount of bitcoins in your day-to-day wallet, transfer some to the wallet on the USB stick. You don't need to boot up the USB stick for this. You only need the address you wrote down.
When you want to spend a large amount of money, boot up from the USB stick and transfer coins from your savings wallet to your day-to-day wallet. Reboot into your normal computer and use the day-to-day wallet to pay for what you wanted to buy.
The core of the issue is simple: Don't store a lot of money in a wallet on a computer that you use a lot. Computers that are used a lot get attacked a lot. Simple :-)
Thanks so much for the thorough explanation! I'm a potato when it comes to reddit's bitcoin tip bot. Send me an address - would like to send some internet magic money your way.
That is very kind! My address is: 1PAXiscvKoGRJ5XxMZvri3CMNeKYYb8wMQ
From: Anonymous Redditor
You are awesome:) Thank you again for the insight! Sent some your way.
From: SanderMarechal*
Your welcome. And thanks for the coin!
From: Anonymous Redditor
Last question(s) (I promise)...
Would a netbook like this be appropriate to 1)dban 2) boot up via USB ubuntu and 3) create the electrum seed?
This would of course never go online, be backed up and encrypted, etc.
Thanks again.
From: SanderMarechal
I don't know. You would be better off asking this on for example. I don't know if that computer's hardware is compatible with Ubuntu. Speed-wise the bottleneck will be the USB stick and not the CPU or memory. USB sticks are much slower than hard drives.
Note that you don't have to buy a computer for this. You can use the computer you already have and still run Ubuntu off an USB stick for your Electrum wallet.
What I said in my previous post about not using your day-to-day computer for your wallet, with that I mean the operating system and software. Not the hardware. Unless you're afraid someone put a hardware keylogger inside your computer :-)
From: Anonymous Redditor
My tin foil hat is in full effect:) Thanks again for your time and patience.
From: SanderMarechal
Your welcome. Have fun with bitcoin!
Oh, I have a question for you now. Would you mind if I repost our entire private conversation here to /BitcoinBeginners? I think other redditors there would also be interested. And if I can repost it, do you want your username in there or should I replace it with "Anonymous Redditor" or something?
From: Anonymous Redditor
You can certainly repost it! And yes, if you wouldn't mind removing the username I would very much appreciate it.
Thanks for asking btw!
Anyway, I hope this is useful for some people out here.
submitted by SanderMarechal to BitcoinBeginners [link] [comments]

[Guide] How to transfer your wallet from your computer to android.

I got tired of waiting and waiting for the whole blockchain to sync so I decided to move my dogecoins to my phone since the app does not need to download the whole chain. (Luckily there is a bounty for a electrum equivalent that will hopefully arrive soon.)
It is much much easier if you just transfer some funds to a new address on your android phone, but this tutorial is for those people like me who can't even get the dogecoin app to sync.
Surprisingly the whole process was very simple. Don't be put off by all the text or all the talk about security. I just want things to be accessible to beginners and to practice good habits. Root is not required.
Note: I am assuming you are using the official dogecoin-qt app and the Dogecoin Wallet app by langerhans.
Disclaimer: This will involve having your private key stored in plaintext. Proceed with caution and treat that file like you would a password. Do not share your private key with anyone.

Getting your private keys

A wallet comprises of public keys and private keys. Public keys are the addresses that you share, you can only use them for viewing. Private keys let you actually make transfers and are what makes you the owner of the wallet. Today we will be transferring those private keys to your phone. They will still be present on your computer unless you delete them, so keep that in mind security-wise.
You will have to replace everything in '<>' with your own values.
  1. Open the desktop app
  2. Open the wallet console by going to: Help -> Debug Window -> Console
  3. If your wallet is locked with a password, you'll need to unlock it by typing: "walletpassphrase 120".
  4. Get the private key for an address by typing: "dumpprivkey "
  5. Save the private key to a file.
  6. Repeat this for each address that you want to transfer over.
Please think about how much dogecoins you want to transfer over. Brarsh:
Do you need that much? What if you lose your device? Just like only keeping a small amount of cash in your wallet and most safe in the bank, only carry what you could conceivably use for that time without access to your main wallet.

Creating a backup file

Next we need to create a backup file so that we can import our addresses into the android app. The android app uses the same format for its backup files as MultiBit (A popular bitcoin app). A typical file looks like the following:
# KEEP YOUR PRIVATE KEYS SAFE! Anyone who can read this can spend your Bitcoins. Kwmxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 2013-06-22T18:36:35Z L1Sxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 2013-05-04T22:47:32Z Kxwxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 2013-05-08T00:58:28Z 
What we want to do is put our private keys in the following format: key date-of-address-creation, where the date is in the format YYYY-MM-DDTHH:MM:SSZ. Note the T and the Z. The android app needs the date so it knows how far back into the blockchain it needs to sync.
If you can't remember when you created the address, visit and get the date of the earliest transaction. It says that the dates are approximate, so I'd just put 00:00:00 for the time.
You should now have a valid unencrypted backup of your wallet.

Importing the backup

  1. Transfer the backup to your android phone, placing it in your Download folder. It has to be put in the Download folder or else the dogecoin app won't find the backup. Make sure it has a name you'll remember later.
  2. Open the dogecoin app and click on: Back Up Keys -> Restore private keys. Click on the name of the backup and from the list that shows up, look for your backup, which should be unencrypted. Click Restore.
  3. Delete the backup in your Downloads folder. Remember, your private key is stored in plaintext in there, so it is important that you delete it. Delete the backup on your computer if it is there also.
  4. Wait for the app to sync completely. Your addresses will be added to the addresses that were already in the app, and your transactions should show up. If they do not, make sure that the date you put was correct and early enough.
  5. Go to Back up Keys > Back up private keys and create a backup. This time it will be encrypted with a password :). If you do not have a backup, you could lose all your coins if you lose your phone or the data on it.
  6. To the moon!


I just got into dogecoin two days ago so correct me if any of this is wrong. Same thing with anything in the post :).
Blockchain/Dogechain: The blockchain is a ledger (record) of all the dogecoin transactions that have ever taken place. As of writing it is larger than 1GB in size. The blockchain is needed to find out how many funds you have in your wallet.
Wallet: A wallet is the digital equivalent of a real life wallet. It is where your money is tied to (It doesn't contain actual dogecoins, but someone else could explain that better than me). The wallet contains your addresses and your private keys, both which are needed to receive and send dogecoins respectively.


Getting your private key
Importing the key into the android app
submitted by cooper12 to dogecoin [link] [comments]

How can I export encrypted private keys from my cold wallet that are easy to import?

I set up a cold wallet using the reference client on an offline machine. All of the sites I read recommended simply backing up the encrypted wallet.dat file, which I did. I did a test run with 0.01 BTC and tried to recover it and it was a nightmare.
I have to do crazy things to restore using the bitcoin-qt or bitcoind client (i.e. move my old wallet.dat, then copy that one over and re-index, which on my old laptop takes literally days).
I then tried using pywallet with the correct passphrase. It dumps a thousand lines of crap along with some "Wallet data not recognized:" errors, and I assumed it wasn't working. I opened it in an editor and cut all the error lines out, and finally got it to import into that way, but it had 300 addresses, even though only 1 was ever used. I suppose this was my fault, I had no idea the default wallet.dat would contain so many addresses (this was all from the offline wallet that I never made a single transaction from).
What I need is something my mom can do. I'm looking for something like the encrypted backup from which is simple ascii text with a password. My goal is to stick this on a usb drive along with a note explaining what to do and put it in a safe deposit box. It needs to be simple enough for my mom to access if something were to happen to me (she's reasonably computer literate, but isn't going to be going and digging around moving hidden files from place to place on her computer). I'd also like the key to be encrypted so that I can make a few copies of the USB key and leave them various places. In the safe deposit box I'll also include a scrap of paper with the password, but otherwise I'll just remember the password so I can recover the coins myself in case the offline computer I'm using craps out.
Any suggestions? Sorry for the semi-rant. I really wouldn't consider myself a beginner, this is just the kind of absurdly difficult thing that scares people away. I suppose I could have used armory or something like that, but I want to understand what I'm doing and not trust any app provided by a company to do my backups.
submitted by bradfordmaster to BitcoinBeginners [link] [comments]

Switching from Bitcoin-QT

So after seeing THIS post this morning I opened up my QT client and had quite a startle. I was BitBroke! I quickly checked my transaction log to see if I was one of the victims of the Bitcoin-QT hack. As it turns out my wallet says I never was BitRitch to begin with. (my wallet showed NO addresses at all!!)
Que the panic.... Was I hacked? Was I robbed?
As it turns out at 2.35am on Dec 27 my wallet was created. Now the holidays were a bit blurry to me so I can't verify what exactly happened at that time so I said fuckit and went to my backup.
After multiple harrowing steps (renaming the backup wallet, running -rescan, crying) I was able to restore my wallet, I'm now in the process of synchronizing with the network. (I checked on blockchain, my BitLoot is still there in my wallet. WOOT!)
So the point of all this is multifaceted. 1) Don't holiday and compute at the same time. 2) make a backup 3) keep calm and mine on
I leave you all with a serious question; What is the best client and can i transfer the locally stored blockchain info from QT to another (say armory) ie. I don't want to wait for Armory to sync with the network when I already did that with Bitcoin-QT, can I just point another client at that 15.2GB folder and call it a day?
submitted by projkt4 to Bitcoin [link] [comments]

Facilitating Discussion of 0.9.0 FINAL of Bitcoin Core (aka Bitcoin QT)

To facilitate a detailed discussion of some of the finer points of this update, I added numbering to each bullet in release notes, and also posted it to RapGenius, where people can annotate it if they'd like.
I'm not a programmer, but I'm curious to hear what programmers and other people smarter than me have to say about all the new changes.
EDIT1 : Doh! Reddit detroyed all the formatting and now i'm on baby duty so can't fix it. EDIT 2: Nap time! Just fixed the formatting :)
---- 0.9.0 RELEASE NOTES ----
Part 1. RPC:
1.1 - New notion of 'conflicted' transactions, reported as confirmations: -1
1.2 - 'listreceivedbyaddress' now provides tx ids
1.3 - Add raw transaction hex to 'gettransaction' output
1.4 - Updated help and tests for 'getreceivedby(account|address)'
1.5 - In 'getblock', accept 2nd 'verbose' parameter, similar to getrawtransaction, but defaulting to 1 for backward compatibility
1.6 - Add 'verifychain', to verify chain database at runtime
1.7 - Add 'dumpwallet' and 'importwallet' RPCs
1.8 - 'keypoolrefill' gains optional size parameter
1.9 - Add 'getbestblockhash', to return tip of best chain
1.10 - Add 'chainwork' (the total work done by all blocks since the genesis block) to 'getblock' output
1.11 - Make RPC password resistant to timing attacks
1.12 - Clarify help messages and add examples
1.13 - Add 'getrawchangeaddress' call for raw transaction change destinations
1.14 - Reject insanely high fees by default in 'sendrawtransaction'
1.15 - Add RPC call 'decodescript' to decode a hex-encoded transaction script
1.16 - Make 'validateaddress' provide redeemScript
1.17 - Add 'getnetworkhashps' to get the calculated network hashrate
1.18 - New RPC 'ping' command to request ping, new 'pingtime' and 'pingwait' fields in 'getpeerinfo' output
1.19 - Adding new 'addrlocal' field to 'getpeerinfo' output
1.20 - Add verbose boolean to 'getrawmempool'
1.21 - Add rpc command 'getunconfirmedbalance' to obtain total unconfirmed balance
1.22 - Explicitly ensure that wallet is unlocked in importprivkey
1.23 - Add check for valid keys in importprivkey
Part 2. Command-line options:
2.1 - New option: -nospendzeroconfchange to never spend unconfirmed change outputs
2.2 - New option: -zapwallettxes to rebuild the wallet's transaction information
2.3 - Rename option '-tor' to '-onion' to better reflect what it does
2.4 - Add '-disablewallet' mode to let bitcoind run entirely without wallet (when built with wallet)
2.5 - Update default '-rpcsslciphers' to include TLSv1.2
2.6 - make '-logtimestamps' default on and rework help-message
2.7 - RPC client option: '-rpcwait', to wait for server start
2.8 - Remove '-logtodebugger'
2.9 - Allow -noserver with bitcoind
Part 3. Block-chain handling and storage:
3.1 - Update leveldb to 1.15
3.2 - Check for correct genesis (prevent cases where a datadir from the wrong network is accidentally loaded)
3.3 - Allow txindex to be removed and add a reindex dialog
3.4 - Log aborted block database rebuilds
3.5 - Store orphan blocks in serialized form, to save memory
3.6 - Limit the number of orphan blocks in memory to 750
3.7 - Fix non-standard disconnected transactions causing mempool orphans
3.8 - Add a new checkpoint at block 279,000
Part 4. Wallet:
4.1 - Bug fixes and new regression tests to correctly compute the balance of wallets containing double-spent (or mutated) transactions
4.2 - Store key creation time. Calculate whole-wallet birthday
4.3 - Optimize rescan to skip blocks prior to birthday
4.4 - Let user select wallet file with -wallet=foo.dat
4.5 - Consider generated coins mature at 101 instead of 120 blocks
4.6 - Improve wallet load time
4.7 - Don't count txins for priority to encourage sweeping
4.8 - Don't create empty transactions when reading a corrupted wallet
4.9 - Fix rescan to start from beginning after importprivkey
4.10 - Only create signatures with low S values
Part 5. Mining:
5.1 - Increase default -blockmaxsize/prioritysize to 750K/50K
5.2 - 'getblocktemplate' does not require a key to create a block template
5.3 - Mining code fee policy now matches relay fee policy
Part 6. Protocol and network:
6.1 - Drop the fee required to relay a transaction to 0.01mBTC per kilobyte
6.2 - Send tx relay flag with version
6.3 - New 'reject' P2P message (BIP 0061, see for draft)
6.4 - Dump addresses every 15 minutes instead of 10 seconds
6.5 - Relay OP_RETURN data TxOut as standard transaction type
6.6 - Remove CENT-output free transaction rule when relaying
6.7 - Lower maximum size for free transaction creation
6.8 - Send multiple inv messages if mempool.size > MAX_INV_SZ
6.10 - Do not treat fFromMe transaction differently when broadcasting
6.11 - Process received messages one at a time without sleeping between messages
6.12 - Improve logging of failed connections
6.13 - Bump protocol version to 70002
6.14 - Add some additional logging to give extra network insight
6.15 - Added new DNS seed from
Part 7. Validation:
7.1 - Log reason for non-standard transaction rejection
7.2 - Prune provably-unspendable outputs, and adapt consistency check for it
7.3 - Detect any sufficiently long fork and add a warning
7.4 - Call the -alertnotify script when we see a long or invalid fork
7.5 - Fix multi-block reorg transaction resurrection
7.6 - Reject non-canonically-encoded serialization sizes
7.7 - Reject dust amounts during validation
7.8 - Accept nLockTime transactions that finalize in the next block
Part 8. Build system:
8.1 - Switch to autotools-based build system
8.2 - Build without wallet by passing --disable-wallet to configure, this removes the BerkeleyDB dependency
8.3 - Upgrade gitian dependencies (libpng, libz, libupnpc, boost, openssl) to more recent versions
8.4 - Windows 64-bit build support
8.5 - Solaris compatibility fixes
8.6 - Check integrity of gitian input source tarballs
8.7 - Enable full GCC Stack-smashing protection for all OSes
Part 9. GUI:
9.1 - Switch to Qt 5.2.0 for Windows build
9.2 - Add payment request (BIP 0070) support
9.3 - Improve options dialog
9.4 - Show transaction fee in new send confirmation dialog
9.5 - Add total balance in overview page
9.6 - Allow user to choose data directory on first start, when data directory ismissing, or when the -choosedatadir option is passed
9.7 - Save and restore window positions
9.8 - Add vout index to transaction id in transactions details dialog
9.9 - Add network traffic graph in debug window
9.10 - Add open URI dialog
9.11 - Add Coin Control Features
9.12 - Improve receive coins workflow: make the 'Receive' tab into a form to request payments, and move historical address list functionality to File menu
9.13 - Rebrand to Bitcoin Core
9.14 - Move initialization/shutdown to a thread. This prevents "Not responding" messages during startup. Also show a window during shutdown
9.15 - Don't regenerate autostart link on every client startup
9.16 - Show and store message of normal bitcoin:URI
9.17 - Fix richtext detection hang issue on very old Qt versions
9.18 - OS X: Make use of the 10.8+ user notification center to display Growl-like notifications
9.19 - OS X: Added NSHighResolutionCapable flag to Info.plist for better font rendering on Retina displays
9.20 - OS X: Fix bitcoin-qt startup crash when clicking dock icon
9.21 - Linux: Fix Gnome bitcoin: URI handler
Part 10. Miscellaneous:
10.1 - Add Linux script (contrib/qos/ to limit outgoing bandwidth
10.2 - Add '-regtest' mode, similar to testnet but private with instant block generation with 'setgenerate' RPC
10.3 - Add '' script to contrib, for creating bootstrap.dat
10.4 - Add separate bitcoin-cli client
submitted by WhiteyFisk to Bitcoin [link] [comments]

Step-by-step guide on how to recover your Bitcoin Wallet using Armory

I deal with the finances for the family so I maintain a how to guide for our finances in case something were to happen to me. Here is my latest chapter on how to recover our Bitcoin holdings. I hope others might find it useful but maybe it will save you some time.
Overview of steps: 1) Install Bitcoin-Qt app 2) Install Amory app 3) Import Paper Backup
What you need: 1. Bitcoin-Qt app. This is free software downloadable from 2. Amory - Bitcoin Wallet Management software. This is also free software available for download from 3. The Paper Wallet from our super-secret hiding place
Detailed Steps 1. Download the Bitcoin-Qt app from Install and run Bitcoin-Qt on an internet connected computer.
  1. Wait for Bitcoin-Qt to synchronize with the network. This will take a painfully long time the first time (potentially 24 hours!), but it should only be a few minutes on subsequent loads. You will see a green checkmark in bottom-right corner of Bitcoin-Qt when it is ready. NOTE: During this time, the wallet needs to validate the blockchain. Validating the blockchain takes a long time (24 hours). The blockchain is a record of all transactions and identifies the owner of the Bitcoin.
  2. Download the Armory Wallet Management software from Install Armory, but don’t run it until Bitcoin-Qt is synchronized.
  3. Start Armory!
  4. Armory will prompt you asking if you want to create a New Wallet or Import Wallet. Select Import Wallet and then select, Restore from paper backup. Enter the codes from the paper backup into Armory application. And voila, our wallet will be restored. NOTE: Put the paper backup back in its hiding place.
submitted by Bonesman to Bitcoin [link] [comments]

Bitcoin-QT 0.9 disponível para download

The Core Developers of Bitcoin released the 0.9.0 FINAL of Bitcoin Core (aka Bitcoin QT).
This is a Final Version, but its the same as 0.9.0rc3
Bitcoin Core version 0.9.0 is now available from:
This is a release candidate for a new major version. A major version brings both new features and bug fixes.
Please report bugs using the issue tracker at github:

How to Upgrade

If you are running an older version, shut it down. Wait until it has completely shut down (which might take a few minutes for older versions), uninstall all earlier versions of Bitcoin, then run the installer (on Windows) or just copy over /Applications/Bitcoin-Qt (on Mac) or bitcoind/bitcoin-qt (on Linux).
If you are upgrading from version 0.7.2 or earlier, the first time you run 0.9.0 your blockchain files will be re-indexed, which will take anywhere from 30 minutes to several hours, depending on the speed of your machine.
On Windows, do not forget to uninstall all earlier versions of the Bitcoin client first, especially if you are switching to the 64-bit version.

Windows 64-bit installer

New in 0.9.0 is the Windows 64-bit version of the client. There have been frequent reports of users running out of virtual memory on 32-bit systems during the initial sync. Because of this it is recommended to install the 64-bit version if your system supports it.
NOTE: Release candidate 2 Windows binaries are not code-signed; use PGP and the SHA256SUMS.asc file to make sure your binaries are correct. In the final 0.9.0 release, Windows setup.exe binaries will be code-signed.

OSX 10.5 / 32-bit no longer supported

0.9.0 drops support for older Macs. The minimum requirements are now: * A 64-bit-capable CPU (see; * Mac OS 10.6 or later (see

Downgrading warnings

The 'chainstate' for this release is not always compatible with previous releases, so if you run 0.9 and then decide to switch back to a 0.8.x release you might get a blockchain validation error when starting the old release (due to 'pruned outputs' being omitted from the index of unspent transaction outputs).
Running the old release with the -reindex option will rebuild the chainstate data structures and correct the problem.
Also, the first time you run a 0.8.x release on a 0.9 wallet it will rescan the blockchain for missing spent coins, which will take a long time (tens of minutes on a typical machine).

Rebranding to Bitcoin Core

To reduce confusion between Bitcoin-the-network and Bitcoin-the-software we have renamed the reference client to Bitcoin Core.

Autotools build system

For 0.9.0 we switched to an autotools-based build system instead of individual (q)makefiles.
Using the standard "./; ./configure; make" to build Bitcoin-Qt and bitcoind makes it easier for experienced open source developers to contribute to the project.
Be sure to check doc/build-*.md for your platform before building from source.


Another change in the 0.9 release is moving away from the bitcoind executable functioning both as a server and as a RPC client. The RPC client functionality ("tell the running bitcoin daemon to do THIS") was split into a separate executable, 'bitcoin-cli'. The RPC client code will eventually be removed from bitcoind, but will be kept for backwards compatibility for a release or two.

walletpassphrase RPC

The behavior of the walletpassphrase RPC when the wallet is already unlocked has changed between 0.8 and 0.9.
The 0.8 behavior of walletpassphrase is to fail when the wallet is already unlocked:
> walletpassphrase 1000 walletunlocktime = now + 1000 > walletpassphrase 10 Error: Wallet is already unlocked (old unlock time stays) 
The new behavior of walletpassphrase is to set a new unlock time overriding the old one:
> walletpassphrase 1000 walletunlocktime = now + 1000 > walletpassphrase 10 walletunlocktime = now + 10 (overriding the old unlock time) 

Transaction malleability-related fixes

This release contains a few fixes for transaction ID (TXID) malleability issues:

Transaction Fees

This release drops the default fee required to relay transactions across the network and for miners to consider the transaction in their blocks to 0.01mBTC per kilobyte.
Note that getting a transaction relayed across the network does NOT guarantee that the transaction will be accepted by a miner; by default, miners fill their blocks with 50 kilobytes of high-priority transactions, and then with 700 kilobytes of the highest-fee-per-kilobyte transactions.
The minimum relay/mining fee-per-kilobyte may be changed with the minrelaytxfee option. Note that previous releases incorrectly used the mintxfee setting to determine which low-priority transactions should be considered for inclusion in blocks.
The wallet code still uses a default fee for low-priority transactions of 0.1mBTC per kilobyte. During periods of heavy transaction volume, even this fee may not be enough to get transactions confirmed quickly; the mintxfee option may be used to override the default.

0.9.0 Release notes

Command-line options:
Block-chain handling and storage:
Protocol and network:
Build system:
submitted by allex2501 to BrasilBitcoin [link] [comments]

How to Back Up Your Bitcoin Wallet How to recover funds from a currupted bitcoin wallet QT Wallet dat Recovery Bitcoin Wallet Recovery Recover your Bitcoin Core wallet password with btcrecover ...

Download Bitcoin QT, become a full node, and join the revolution. While this isn’t the best wallet, or the most convenient, or the most secure, or the easiest to use, or the prettiest, it IS the oldest and has passed the test of time. If you prefer a more mature partner – with all the charm that entails – this is the one for you. Getting started. Head over to and download the ... QT wallet – Most of the crypto currency core wallets are developed using QT software framework. They are available for Windows, Linux and Mac. QT wallets are professional client and offers full function that’s available for a currency. Also they are heavy as it is known to download the complete blockchain to your local computer. I had Bitcoin-Qt on my computer with several bitcoins in my wallet, using Vista. Then my computer crashed. Finally I was able to get my computer fixed and download a new version of Bitcoin-Qt. Now I would like to import my original wallet.dat from the old client which was encrypted into an new version of Bitcoin-Qt. How do I do that? Bitcoin-QT, hoe restore je je wallet? Hoi! Ik had van de week een backup van m’n Bitcoin wallet gemaakt, waarbij ik een Wallet.dat bestand overhield. Ik had ook nog een recente totale backup van al m’n Bitcoin-data (de hele map die in je Application Support-map staat). Nu wilde ik deze restoren nadat ik m’n computer de hoognodige voorjaarsschoonmaak had gegeven, maar ik loop tegen een ... Homepage » Cryptocurrency » How to Backup and Restore a Bitcoin Wallet. Cryptocurrency How to Backup and Restore a Bitcoin Wallet. by Harshil Barot. July 27, 2020. People who are dealing in cryptocurrency, mine, or invest in it they use special hardware or virtual wallets. The usage of these E-wallets is safe and secure, sometimes miners and investors are not lucky, and they lose their ...

[index] [11543] [15873] [33078] [38054] [4314] [14612] [49494] [36531] [35023] [21287]

How to Back Up Your Bitcoin Wallet

bitcoin paper wallet, bitcoin preev, bitcoin program, p vs np bitcoin, bitcoin miner .p bitcoin p bitcoin price bitcoin p=np forum.bitcoin. pl bitcoin qt bitcoin qr code bitcoin qt synchronizing ... How to Restore a Bitcoin Wallet from a Seed (Electrum) - Duration: 11:17. Rex Kneisley 14,158 views. 11:17. Navy SEAL Jocko Willink Breaks Down Combat Scenes From Movies GQ - Duration: 26:48 ... Share your videos with friends, family, and the world Learn how to Brute Force Bitcoin Core Wallets, Tutorial on how to hack a wallet, generate the private key. Extract Private Keys from Trust Wallet - works for Bitcoin, Ethereum, Litecoin and other cryptos - Duration: 5:48. Crypto Coin Investor 3,690 views