How to import private keys - Bitcoin Wiki

Groestlcoin 6th Anniversary Release

Introduction

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?

Windows
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.
OSX
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.
Ubuntu
http://groestlcoin.org/forum/index.php?topic=441.0

Other Linux

http://groestlcoin.org/forum/index.php?topic=97.0

Download

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

Source

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.

Features

Download

iOS
Android

Source

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.

Features

Download

Main Release (Main Net)
Testnet Release

Source

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.

Features

Live Version (Not Recommended)

https://www.groestlcoin.org/recovery/

Download

https://github.com/Groestlcoin/mnemonic-recovery/archive/master.zip

Source

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).

Features

Usage

https://github.com/Groestlcoin/VanitySearch#usage

Download

Source

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).

Features

Download

Source

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.

Features

Remastered Improvements

Download

Source

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.

Features

Download

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

Source

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.

Features

Download

Windows
Linux / OSX (Instructions)

Source

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.

Changes

Download

Main Net
Main Net (FDroid)
Test Net

Source

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.

Changes

Download

Source

UPDATED – P2Pool Test Net

Changes

Download

Pre-Hosted Testnet P2Pool is available via http://testp2pool.groestlcoin.org:21330/static/

Source

submitted by Yokomoko_Saleen to groestlcoin [link] [comments]

Gridcoin 4.0.5.0-Leisure "Elizabeth" Release

The core developers are pleased to present the 4.0.5.0 Elizabeth milestone leisure release. This is a leisure release primarily aimed at non-mandatory items and bug fixes leading up to the Fern mandatory milestone release.
This release also enables us to whitelist teams other than Gridcoin as a stepping stone for the implementation of no team requirement in Fern.
Enjoy!
https://github.com/gridcoin-community/Gridcoin-Research/releases/tag/4.0.5.0
Changelog...

Added

Changed

Removed

Fixed

submitted by jamescowens to gridcoin [link] [comments]

(Updated) [Staking] Reddcoin Core client GUI wallet on a Raspberry Pi Model 3B

Intro

This thread is an update to my first Reddcoin staking tutorial that was written 7 months ago.
 
The reason for the update
My Reddcoin Core software crashed and became unusable. My Raspberry Pi 3B would lag and freeze, I couldn't stake anymore.
 
Instead of just redoing everything the same way, I wanted to see if I could improve on 3 points:
 
The updates
 
If you would like to tip me
Writing a tutorial like this takes time and effort; tips are appreciated. My Reddcoin address: RqvdnNX5MTam855Y2Vudv7yVgtXdcYaQAW.
     

Overview

 

Steps

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     

Video

https://www.youtube.com/watch?v=Snr5e8bzftI
This video shows how long it takes to start Reddcoin Core.   TL;DR:
     

Extra

Backup
Backup your wallet to prevent losing the RDDs in your wallet! There are two methods to backup, do both. Make new backups if you create a new receiving address!
 
 
   
Boot with only 1 USB drive plugged in:
Make sure only the USB drive (with the swap partition and data partition) is plugged in when you boot up your Raspberry Pi. This to make sure the swap partition (/dev/sda1) is recognized correctly.   If you boot up with multiple USB drives, Lubuntu might see the USB drive with the swap partition as the second drive (instead of the first drive), and ignore the 2 GB swap partition. If this happens, starting Reddcoin can render the Raspberry Pi unresponsive.
   
Connection issues If you have issues syncing the blockchain because you have 0 network connections, please follow the instructions in this thread.
   
Start Reddcoin Core easier
Run a shell script (.sh file), so you can start Reddcoin just by double clicking on an icon on your Desktop.
   
Minimization options
Adjust minimization options, so you can safely press on the X button (the close/exit button on the upper right corner).
   
RealVNC VNC Viewer (client) and VNC Connect (server): To remote connect to the Raspberry Pi, I use VNC Viewer ad VNC Connect from RealVNC.
 
   
Chromium as browser: The updates break Firefox, the browser crashes when you try to run it. Install another browser, Chromium, to solve this issue.
   
Updates / Upgrades
If Software Updater shows up and tells you that there is updated software available, do not install the updates using Software Updater. Use LXTerminal to update Lubuntu.  
     

Credits:

   
Credits in previous tutorial:
submitted by Yavuz_Selim to reddCoin [link] [comments]

Walk through of how to claim BCD Bitcoin Diamond

I am completely naive when it comes to Linux, coding, compiling, etc., so I found it difficult to follow advice I found for compiling the bitcoin diamond code form git. I followed a few guides for bitcoin core first and could never get it to work. I got some help from someone that knows Linux and here's what finally worked for me with BCD.
Use rufus to make bootable usb with ubuntu iso. (https://rufus.akeo.ie/)
Boot from the usb and install ubuntu.
Follow this guide to compile bitcoin from git: https://www.toshblocks.com/bitcoin/compile-bitcoin-source-code-ubuntu-16-04-lts/
Do the entire guide with bitcoin core to ensure everything is working.
Make sure you replace "theusername" with your own each time it appears, or make "theusername" your user name from the beginning.
There was one small difference, at the end of the guide to run bitcoin-qt it is ./src/qt/bitcoin-qt
At the end when trying to run bitcoin-qt (./src/bitcoin-qt) it said there was no such file, which made me think that I did something wrong but you just have to find where the file is. Hey, I said I was a complete noob, go easy on me.
When you repeat the procedure for BCD there will be a few small changes:
git clone https://github.com/bitcoin/bitcoin.git
becomes
git clone https://github.com/eveybcd/BitcoinDiamond.git
mkdir bitcoin/db4/
becomes
mkdir BitcoinDiamond/db4/
../dist/configure --enable-cxx --disable-shared --with-pic --prefix=/home/theusername/bitcoin/db4/
becomes
../dist/configure --enable-cxx --disable-shared --with-pic --prefix=/home/theusername/BitcoinDiamond/db4/
./configure LDFLAGS="-L/home/theusername/bitcoin/db4/lib/" CPPFLAGS="-I/home/theusername/bitcoin/db4/include/"
becomes
./configure LDFLAGS="-L/home/theusername/BitcoinDiamond/db4/lib/" CPPFLAGS="-I/home/theusername/BitcoinDiamond/db4/include/"
when you get to this line: [email protected]:~/BitcoinDiamond$ ./autogen.sh
I got the following error:
bash: ./autogen.sh: Permission denied
this command will show some information about autogen.sh
[email protected]:~/BitcoinDiamond$ ls -l autogen.sh
-rw-rw-r-- 1 mmmmm mmmmm 527 Dec 30 21:26 autogen.sh
same command comparing it to the bitcoin core version of autogen.sh
$ ls -l ../bitcoin/autogen.sh
-rwxrwxr-x 1 mmmmm mmmmm 527 Dec 30 21:03 ../bitcoin/autogen.sh
do this to make them the same
[email protected]:~/BitcoinDiamond$ chmod a+x autogen.sh
recheck autogen.sh and it should match the bitcoin core autogen.sh now
[email protected]:~/BitcoinDiamond$ ls -l autogen.sh
-rwxrwxr-x 1 mmmmm mmmmm 527 Dec 30 21:26 autogen.sh
continue on
[email protected]:~/BitcoinDiamond$ ./autogen.sh
[email protected]:~/BitcoinDiamond$ ./configure LDFLAGS="-L/home/mmmmm/BitcoinDiamond/db4/lib/" CPPFLAGS="-I/home/mmmmm/BitcoinDiamond/db4/include/"
[email protected]:~/BitcoinDiamond$ make -s -j5
It will work a while and then you'll get the following error, among others:
/bin/bash: ../share/genbuild.sh: Permission denied
It's the same error as with autogen.sh, so find it and fix it by the following:
[email protected]:~/BitcoinDiamond$ find . -name genbuild.sh ./share/genbuild.sh
[email protected]:~/BitcoinDiamond$ chmod a+x ./share/genbuild.sh
continue on by restarting make
[email protected]:~/BitcoinDiamond$ make -s -j5
It should be good!
go to and run bitcoin-qt to start the gui
[email protected]:~/BitcoinDiamond/src$ cd qt
[email protected]:~/BitcoinDiamond/src/qt$ ./bitcoin-qt
bitcoin-wt will spend some hours syncing the entire blockchain so you have to wait.
When it is finished, import private keys by:
clicking in the "Bitcoin Core - Wallet" window to make it active
hover mouse in top left of the grey bar on the top of the deskto screen, not the "Bitcoin Core - Wallet" until it says "file settings help"
click on "help"
click on "Debug Window"
click on the "Console" tab
enter "importprivkey 5KJvsngHeMpm884wtkJNzQGaCErckhHJBGFsvd3VyK5qMZXj3hS" with your own key
make an account at gate.io where they are allowing deposits
sell!, or don't, maybe you're nuts, who am I to judge
submitted by Ozmodiar to BitcoinAirdrops [link] [comments]

Groestlcoin Release September 2018

Introduction

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 SwapLab.cc, 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 https://www.reddit.com/groestlcoin/comments/9ikr5m/groestlcoin_releases_grspay/? to see more on this!
https://www.melis.io/assets/logo-navbar-4b6f0d372f15b2446d3fa4c68f346e4fb08ee113941186cee58fd6135f3f8b7d.svg

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:
https://guarda.co/assets/images/1PGo4ID.svg?1537791124643

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 www.guarda.co
https://holytransaction.com/images/logo.png

Integrated into HolyTransaction

What is HolyTransaction?

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

Features

For more information, visit Holy Transaction here.
https://www.groestlcoin.org/wp-content/uploads/2018/09/next-grs-groestlcoin.jpg

Integrated into NEXT Wallet

What is NEXT?

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

Features

For more information, visit NextWallet here.
https://blockchainfinancial.com/mediaserve2018/09/admin-06143647-bcf_logo_vec_256x256.png

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 whitepuma.net, 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 whitepuma.net 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](www.blockchainfinancial.com)
https://www.huobi.com/image/logo.aeb4723.svg

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 (https://nvd.nist.gov/vuln/detail/CVE-2018-17144) 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 2.1.0.6). 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 (https://lists.linuxfoundation.org/pipermail/bitcoin-core-dev/2018-Septembe000064.html). 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
http://i.imgur.com/3YhyNZK.png

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.

Changes:

http://i.imgur.com/3YhyNZK.png

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.

Changes

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.

Features

• 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.
Changes
Features
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.
Features
![WebWallet](https://i.imgur.com/Z2oj7bj.png)

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.
Changes:
submitted by Yokomoko_Saleen to groestlcoin [link] [comments]

PSA: Using paper wallets, understanding change addresses.

Paper wallets are a handy little store of a private key offline. Unfortunately, many people seem to misunderstand one of the fundamentals of how they work, and subsequently lose vast amounts of money. Storage in a paper wallet is completely safe, retrieving the funds from one is less so.
In typical use, a paper wallet would be retrieved into a client using the importprivkey command, and from there it should be assumed at the paper wallet is completely useless. From the moment the first transaction is made, the paper wallet is empty, this is due to the way to the way that the client handles change.
Lets explore this with an example.
Let's imagine that I send the full contents of my paper wallet (5BTC) to a new address, once I have imported it to bitcoin-qt.
+-------+ | paper | +-------+ | | | V +--------------------+ | destination (5BTC) | +--------------------+ 
This is the expected behaviour, my paper wallet now contains 0 bitcoin, and the receiving address contains 5BTC.
This time, I am going to send 1BTC to an address from my 5BTC wallet, and keep 4BTC in my paper wallet for later.
+-------+ | paper | +-------+ | +------------------------+ | | V V +--------------------+ +---------------+ | destination (1BTC) | | change (4BTC) | +--------------------+ +---------------+ 
Unfortunately this isn't how bitcoin works. There is now nothing in my paper wallet, and 4BTC has been moved to a new "change" address. If you wish to keep this amount in an offline address than, you must create a new paper wallet for this change.
The mistake people have made in the past is to import a paper wallet with 100BTC in it, spend one or two, and then assume that the paper wallet still holds 98BTC.
This situation is only an issue if you reimport a wallet and expect the funds to remain on it. This issue doesn't apply if you are using your wallet normally.
Hope this saves people some serious hassle, and money.
This text is unlicensed. Print it, modify it, sell it.
submitted by explainschange to Bitcoin [link] [comments]

12-30 21:33 - 'THAT'S RIDICULOUS!!! YOU DON'T NEED TO RUN AN ELECTRONEUM SERVER TO USE THE CORE WALLET/NODE. AND THE QT CORE IS JUST AS SIMPLE AS ELECTRUM (I THINK EASIER) PLUS IT ALLOWS FOR SO MUCH MORE FLEXIBILITY SHOULD YOU WISH TO...' by /u/Nycmdthroaway removed from /r/Bitcoin within 130-140min

'''
THAT'S RIDICULOUS!!! YOU DON'T NEED TO RUN AN ELECTRONEUM SERVER TO USE THE CORE WALLET/NODE. AND THE QT CORE IS JUST AS SIMPLE AS ELECTRUM (I THINK EASIER) PLUS IT ALLOWS FOR SO MUCH MORE FLEXIBILITY SHOULD YOU WISH TO DELVE INTO THE ADVANCED FEATURES. THE ONLY CAVEAT IS THE TIME TO SYNC AND THE SPACE REQUIRED. BUT IF EVERYONE SAID "FUCK THAT I'M NOT WASTING 250GB AND RUNNING MY WALLET 24/7 TO GET/KEEP IT SYNCED, OR WAITING FOR IT TO RESYNC EVERY TIME I WANT TO SPEND" THEN BITCOIN WOULD HAVE NO DECENTRALIZATION LEFT (WHICH HONESTLY IF YOU LOOK AT THE DECREASE IN NODES RUNNING, YOU'D SEE THAT'S WHAT'S HAPPENING.) ACTUALLY BELIEVE IN BITCOIN? THEN PUT UP OR SHUT UP!
Just run the core node! A.K.A. the full wallet. You don't need to set up an electrum server. That would only be if you wanted to contribute to the electrum network by serving as a public server. But honestly, it's much better to run the core in terms of decentralization anyway.
It requires no technical know-how! Only a couple hundred gigs of hard drive space and a week of letting the blockchain sync (for an average PC that's a few years old). And you can "prune" the node after it finishes syncing so you'll only need ~10GB of space when all's said and done (although you must have at least 250GB free to properly sync). Just download the official qt for whatever flavor of bitcoin/altcoin you need and run the installer.
It's honestly just as easy as electrum- you just need to sync first before you can spend.
Importing the xpriv's from your old electrum wallet is easy...
  1. Open debug window (help>debug window)
  2. Click on the 'command line' tab.
  3. Type `importprivkey ' (no <>).
*To get your xpriv (AKA private keys, out of electrum, right mouse button on all your addresses with funds and select show private key. Do this for each private key, importing one by one and you're done. If the repetition is too much for you. Just send all your coins to a single address first.
*NOTE THAT YOU MAY ALSO CHOOSE TO SIMPLY GENERATE A NEW ADDRESS FROM THE GUI IN THE CORE NODE AND SEND YOUR COINS FROM ELECTRUM TO YOUR NEW NODE. YOU MAY DO THIS AS SOON AS YOU'RE DONE SETTING UP THE CLIENT- HOWEVER YOU WON'T SEE THE TRANSACTION COME THRU UNTIL YOUR NODE SYNCS SO DON'T BE WORRIED ABOUT THAT ASPECT *
It'll take 7 minutes to set up and then you will not only be running securely, able to use any address format you want (including the segwit P2SH keys everyone should use for BTC), your txns and IP aren't logged by a random server, and you're helping maintain a Distributed Blockchain.
Forward the default port 8333 in your router NAT mapping and make yourself connectable to actually make a difference.
You'll probably notice your transactions confirm a tad bit faster during times of congestion as well.
'''
Context Link
Go1dfish undelete link
unreddit undelete link
Author: Nycmdthroaway
submitted by removalbot to removalbot [link] [comments]

Bitcoinzero (BZX) claiming problem - Invalid private key encoding (error code -5)

hi i'm totally retarded and cant manage to claim bzx with my bitcoin privkeys.
i downloaded the qt client, extracted the 9gb bootstrap files into correct folder, then tried to do importprivkey.
keep getting "Invalid private key encoding (error code -5)" errors.
has anyone successfully claimed BZX with bitcoin private keys help me?
submitted by btcretiredproblems to BitcoinAirdrops [link] [comments]

DNotes 2.0 Frequently Asked Questions:

DNotes 2.0 Frequently Asked Questions:
Q: What is new with DNotes 2.0?
A: DNotes 2.0 is a major improvement on the original DNotes blockchain. The new blockchain will allow DNotes and its partner company DNotes Global to achieve its objective to connect DNotes to the modern world of finance and commerce. The new blockchain is faster, more secure, and consumes only a fraction of the electricity. It also allows custom invoices to be created and attached to transactions, and changes the economic incentives of the network to one that encourages savings with the switch to the Proof-Of-Stake algorithm, and paying 0.5% interest on balances that haven’t moved from a wallet address in a 30 day period (~6% per annum).
Specifications
POS 2% Annualized Staking Reward Individual blocks reward will be Total Coins / 525,600 60 Second Block Target 0.005 Transaction Fee Source: https://github.com/DNotesCoin/DNotes2.0 Download Wallet: https://github.com/DNotesCoin/DNotes2.0/releases/tag/v2.0.0.0 Directory DNotes2 (C:\Users\USERNAME\AppData\Roaming\DNotes2 on Windows) CONF dnotes.conf (all lower case)
DNotes 2.0 Features Switch to PoS CRISP Reward - 0.5% interest every 30 days. Awarded by address. Calculated on a 30 day cycle. Automated Invoicing (First Phase) - Integrated blockchain invoice number
There will be a soft deadline where DNotes mined after that block will not be redeemable for 2.0 coins: 4/16/2018 Block# 2180897 133,574,552 Will be the total swappable amount of DNotes we create +20,000,000 Allocated to DNotes Global, Inc for Development & Growth Fund 153,574,552 Total DNotes 2.0 Created
The next update (TBD) will include: Deferred Staking
Q: How do I swap my coins?
A: DNotes stored on the DNotesVault are automatically swapped for you, you don’t need to take any action as the swap process has been done on your behalf.
If you already had a DNotesVault account prior to the swap and still have more coins to swap from exchanges or a PC wallet:
Login to your DNotesVault account. Click “historic” at the top, and send your old DNotes to one of your historical addresses. The DNotes you send will then be converted to the new DNotes 2.0 coins, and will show in your new DNotes wallet under “dashboard” after we have completed the swap process. Note: Please allow some time for this process to complete.
If you do not have a DNotes Vault account, you can perform a manual swap:
Visit the following address: https://goo.gl/forms/MMAKqbqejd1rwf1m2 Provide us with your contact email, and your DNotes 2.0 address. We recommend creating an account at www.dnotesvault.com and sending us your deposit address. Otherwise you can download the DNotes 2.0 QT wallet here: https://github.com/DNotesCoin/DNotes2.0/releases We will contact you with an address for you to send your old DNotes coins to, and send you back the new DNotes 2.0 coins.
Q: I had a DNotes Vault account with DNotes in it before the swap. Have my old DNotes been swapped into the new coins?
A: Yes. We have taken care of swapping all coins held at the DNotes Vault at the time of the upgrade. You don’t need to take any action.
Q: I found some DNotes from the old blockchain, can I still swap them for the new DNotes tokens?
A: Yes, we will continue to run the old blockchain and give a reasonable period of time for people to swap their DNotes to the new DNotes 2.0 tokens. We recommend that users take action to swap their coins as soon as possible, and may treat swaps on a case by case basis.
Q: I have a paper wallet. How do I turn them into the new coins?
A: You will need to download the DNotes v1.2 software, and then use the importprivkey command in the debug console.
https://bitcoin.stackexchange.com/questions/5941/how-do-i-import-a-private-key-into-bitcoin-core
Once your wallet is updated, you will be able to send out your DNotes.
Q: What is the cutoff date for mined DNotes that can be swapped to the new DNotes blockchain?
A: We have set April 16th as the soft deadline. No DNotes mined after this date will be eligible to be swapped to DNotes running on the new blockchain. We will continue swap DNotes after that date, however the process will not be as easy and will take more time.
Q: What is Staking?
A: Staking your coins helps to support the DNotes network, and the network currently pays out roughly 5 DNotes every minute to one address on the network based on a probability that centers on how many coins the user is staking with as a percentage of the total number of coins being staked on the network. The DNotes network pays out ~2% of the total number of coins per annum. If 100% of DNotes were being used to stake on the network, then by probability each user could expect 2% growth in the number of coins they have. If only 50% of coins are used to stake, then those users could expect approximately 4% growth that year.
Q: Can I stake my coins on the DNotesVault?
A: You cannot currently stake your coins that are on the DNotesVault, you will need to withdraw your DNotes 2.0 to a local wallet and stake your coins from your local wallet. We will in a future release incorporate cold staking, which will allow you stake your coins while they are safely tucked away inside the DNotesVault. However, we do not have an ETA, it will be one of our highest priorities for next upgrades.
Q: How do I stake?
Disclaimer: It is recommended that you properly secure your computer and wallet, as well as make proper backups, before attempting to run your own staking wallet. Failure to properly secure your DNotes may result in loss or theft. If you are not familiar with the process, please start off small and familiarize yourself with the process.
You will need to download the DNotes QT wallet here: https://github.com/DNotesCoin/DNotes2.0/releases/tag/v2.0.0.0
Install the wallet (and we recommend creating a backup) Go to settings, and then ‘encrypt wallet’. Enter your password twice (and do NOT forget it, or you will not be able to access the wallet and we can not help you). Go to settings, and then ‘unlock wallet’, enter your password, and select “for staking only”. This will prevent any transfers from being made from your wallet without the password while you stake your coins. Soon the arrow at the bottom will turn green. This means that your coins are now staking.
You can watch a video of these steps here from our alpha release here: https://www.youtube.com/watch?v=2w9r2LoXM6c
Q: How do I earn the interest reward?
A: Our Cryptocurrency Investment Savings Plan (CRISP) payouts occur approximately once per month. All coins that haven’t moved address during that month period will accrue a 0.5% interest, which compounds to roughly 6.17% per annum. If you move your coins during that time, those coins will not receive the interest for that month.
Q: What exchanges are DNotes listed on?
A: Cryptopia, Nova, Yobit, & Trade By Trade
Q: Will DNotes 2.0 be listed on new exchanges?
A: The DNotes team are working to get DNotes listed on new and larger exchanges.
Q: When will Cryptopia relist DNotes 2.0?
A: Cryptopia is starting the delisting process and they have advised they will connect us with their relisting team once the DNotes have been removed from the exchange, in order to prevent confusion.
Q: Are the new DNotes 2.0 coins worth the same as the old coins?
A: Yes, they are worth exactly the same. However we can not predict what price movements will occur at exchanges once DNotes is relisted using the new coins.
Q: I have DNotes on the exchange, do I need to remove them from the exchange?
A: Yes, as soon as possible. Please see “How do I swap my coins?”
Q: I have Mac or Specific Linux OS, will there be wallets for these?
A: Yes, these are among our high priority items to get done as soon as possible.
If you have any other queries, please email [email protected]
submitted by AceRun1 to DNotes [link] [comments]

Questions about pruned bitcoin-qt (HD) wallets.

Is it true that if you're not interested in the history (metadata) of your transactions, "importaddress" and "importprivkey" don't require a pruned node to download the whole blockchain again (the utxo set is enough)? If so, shouldn't this functionality be allowed for pruned wallets in a future release of bitcoin-qt?
Another question: a pruned HD wallet can generate as many new addresses (and corresponding private keys) as necessary and never needs to download the blockchain again because these newly generated addresses don't have a history?
submitted by sumBTC to Bitcoin [link] [comments]

Problems importing private key from paper wallet to bitcoin-qt

For testing purposes I sent some BTC to a paper wallet from my bitcoin-qt client and later, after ~50 confirmations I imported the private key from the paper wallet back into bitcoin-qt with the command importprivkey $key $label rescan and after half an hour of rescan it doesn't show anything. Well, almost nothing, it renamed the paperwallet address I sent to in the first place to "$label" in the outgoing transaction, but no other sign of the imported private key, especially the balance didn't change. The Blockchain explorer shows the funds are still under the associated paper wallet address. Anybody knows what's going on here, what I did wrong and how to do it correctly? Thanks!
submitted by kbdwarrior to Bitcoin [link] [comments]

How to setup a Dogecoin Vanity Address!

WHAT IS A DOGE VANITY ADDRESS
Vanity addresses are ones where you can choose what characters appear somewhere in the address. For example, DPie5ucpypDTUsgquc3ea2Meg6TwpW6mW1. All Doge addresses must start with D (capital) and the second character must be a capital if it is a letter (not all letters accepted, for example I O Y W are not allowed as the second character). You can also create letters or words at the end or even beginning of the address such as:
Letters that I have found valid as second characters are: 5 6 7 8 9 A B C D E F G H J K L M N P Q R S T U
HOW TO CREATE YOUR VERY OWN DOGE VANITY ADDRESS
HOW TO IMPORT YOUR NEW DOGE VANITY ADDRESS INTO YOUR DOGECOIN-QT WALLET
For MultiDoge, see here
<3 pie
submitted by PieCrafted to dogecoin [link] [comments]

Cold Wallet Currency Design Final (PSD and paper wallet info)

Hi, this design is a cold wallet, a form of offline storage of your DogeCoin, to be kept safely in a safe or safety deposit box, or even to hand out to people at lower denominations.
A cold wallet is a means of protecting cryptocurrency offline and away from potential attacks, this is done by generating a new key set from a paper wallet generator such as http://dogecoinpaperwallet.net/ or extracting your own via your wallet QT (not recommended)
The private key is the authorisation allowing an online wallet to claim any doges associated with it and must be kept extremely safe. A public key is also married to the account but only allows deposits or a checking of balance via the blockchain, it is safe to present the public key.
With that being said, this is my final iteration of the currency style custom cold wallets, though I encourage anyone to remix and use as they wish. It is meant to be cold storage only, the currency style of the design is merely for novelty, a cold wallet could basically just be a private key printed on some toilet paper, but hte design is just for aesthetics. This seemed to confused some bitcoiners who kept going on about how it would be spent.
Here is the editable PSD: https://mega.co.nz/#!iY5CSZLJ!paIrrhx-J4ZTshGho81AZhpDSGQcifBM7QqA289NK2s
It contains the whole note, front and back and fold tab, layered and easily manageable, with editable text where denomination is concerned, allowing for quick alteration to any denomination or use. The parent folder of both notes has a colour overlay allowing easy customisation between your denomination editing, there's also a hidden doge face in the file with a winky face incase you would like to have a changeup of expression on the doge
It's separated into front and back of the note for doublesided printing and foldover for the private key.
Simply import into photoshop and add your own keys in the respective places to match your preconceived denomination amount and it's ready to use.
To import a private key back into an online wallet, inthe qt go to Help > Debug Window > Console and type importprivkey “your private key” and enter, then retart the client to see it active
*I would advise if you give it to people that you include some form of instructions on the back, this is why the backside of the note is relatively blank, to allow personalisation.
submitted by SnazzyGaz to dogecoin [link] [comments]

Sweeping from paper wallet - Invalid private key (code -5)

SOLVED
So a while ago I created a few paper wallets with BIP38 passphrases. Everything seemed to go according to plan, their balances transferred in and I can check them on the blockchain. But now, I'm trying to get some of the coins out...
I followed the various guides (this Litecoin one proving most helpful), but am still getting the "code -5" error.
I open my Vertcoin-qt wallet and enter walletpassphrase 'myqtpassphrase' '60' and that works (I think), but then I enter importprivkey 6PvTSw...keystuff and I get the error. Am I supposed to enter the QT passphrase, or the BIP38 passphrase from the paper wallet?
I've tried the Android app, but when that scans the QR, it says "Cannot classify input."
L'il help, please?
Edit to add: Reading here, it sounds like I need to decrypt the BIP38 wallet before trying to import it?
submitted by iamthinksnow to vertcoin [link] [comments]

How to create a vanity address

For those interested, you can create a vanity address this way:
1) Download vanitygen from here: https://en.bitcoin.it/wiki/Vanitygen
2) run:
vanitygen -X 50
where is an address you are interested in. They must start with "M" and the second character can be between 7-9 and A-X (not capitol I or O, as those are not base58).
An example:
vanitygen -X 50 -i Mcrypt
ran for a while, and gave me my new address of:
Address: MCrypTZRTRk8RGjSt3MZ3atSEwSLPicePR, Privkey:
You can then import that address into myriadcoin-qt from the console with:
importprivkey
edit: added the "-i" option for case insensitivity.
submitted by cryptapus to myriadcoin [link] [comments]

Guide: How to redeem and sell bitcoin diamond (bcd) from ledger nano s (Segwit)

I spent two days to figure this out but I think I know how to solve this, just currently stuck and need your help! I had btc stored on a nano s segwit wallet before the fork.
Bitcoin diamond was forked from bitcoin on block #495866 (nov 24 2017) and launched the mainnet Jan 5 2018 (I think). There is currently very little information about this project and very little support on exchanges, wallets and mining. http://btcd.io
The only light wallet currently have a splitting tool is Bither for Android but they do not support Segwit. If you had your btc in a segwit wallet before the fork you can't use this method.
Otherwise follow this: https://steemit.com/bitcoin/@tiberiu/how-i-claimed-sbtc-super-bitcoin-from-my-paper-wallet Or this: https://www.reddit.com/BitcoinMarkets/comments/7oekie/guide_how_to_redeem_and_sell_all_bitcoin_fork/
You get 10 bcd for every btc and current price is 0.001 btc. That means you get $160/ forked btc which is 1% free money. Is it worth it? For me it is. You can use same method for both SBTC and BCD. Other methods can be used for BTX, BCX and BFX but have to wait for me. Need segwit support in Coinomi and/or Bither.
In my BCD case it was a bit more complicated but hopefully possible.
  1. Move btc from ledger nano to somewhere save
  2. Download the BIP39 converter (standalone version). Unplug your internet and run the html: https://github.com/iancoleman/bip39
  3. Enter your ledger 24 word mnemonic. Select BIP49 derivation path. Find your btc address that contained btc right before block 495866, copy private key. Use a block explorer: https://blockchain.info
  4. Find the tx ID that sent those btc and verify in bcd explorer if you have any bcd before you continue (click on the actual address will not work for some reason, shows empty). My tx had 3000 confirmations. http://explorer.btcd.io
  5. Now the complicated part =) You have to build bitcoin diamond core app from source because it doesn't exist yet: https://github.com/eveybcd/BitcoinDiamond
  6. I built it for windows x64 using this guide (by cloning bitcoin diamond from github instead of bitcoin when you come to that step). Took 1h.: https://github.com/bitcoin/bitcoin/blob/mastedoc/build-windows.md
  7. Actually quite cool you can run Ubuntu on Windows 10! You can build for 32 bit as well but not when you have installed dependencies for x64. The last step will copy the binaries to your windows folder: "make install DESTDIR=/mnt/c/workspace/bitcoindiamond"
  8. Run bitcoindiamond-qt in windows and let it sync with network. Took me 12h with fiber connection.
  9. Go to help and open console. If your wallet is encrypted, decrypt for 10min using: "walletpassphrase your-wallet-passphrase 600".
  10. Import old btc address as watch-only to check bcd balance. True means it will rescan the blockchain. Rescan took 1h with a decent PC (no SSD):
  11. If you see your BCD balance, now Import your btc private key into the watch-only address. No need to rescan again, thus "false".:
Ok here is where I'm stuck. I can see my balance but it's not spendable. I also tried to import private key directly (with sync) with empty core wallet but balance is still zero. It does not pick up the transaction! Anyone know how to solve this?
Rest of the guide when this is solved:
submitted by Joohansson to CryptoCurrency [link] [comments]

Help needed importing paper wallet into dogecoin client. Can see key/address, but no doge. :(

So I am trying to import my paper wallet of 200k doge into dogecoin 1.6, i typed importprivkey mykeyhere, and it hung for a bit. then, when i tried again after it crashed, i get the error that it already exists. lo and behold, i can see the address in my much recieve list (there are only 2, that one and the original), however, my dogecoins are not showing in my client, and appear on the dogechain as still just sitting there. i'm not sure what to do or how to fix it. more info can be provided, just ask - much thanks. I did many google's for how to solve this, but i keep just finding bitcoin bug articles that aren't very helpful. Or, if anyone knows how i can move the doge into multidoge instead using the privkey, that would be fine as well. thanks all :)
edit - i'm now not a real fan of paper wallets, but i'm sure i'll learn from this, i just wish it wasn't so much doge! :(
EDIT 2 - much fail - any dogecoin-qt experts out there help us out (now two of us with same problem - thanks folks).
Final Edit - Ok - MultiDoge to the rescue. got all my doge back now. thanks big to TheIsleOfSand, and hopefully 6_ft_4 can get his doge now too!! Thanks to all good shibes, love doge! To the moon! :)
submitted by suchshibesocoin to dogecoin [link] [comments]

PSA: If you want to run a "full" node but don't have much disk space

...simply delete the old blk0***.dat files from your blocks directory after bitcoin-qt is done indexing them.
(or rename them if you want to test without having to redownload the blockchain)
This will work perfectly fine if you are not doing anything obscure. If a peer tries to load a block from you which you deleted your node will simply ignore the request. (see this private testnet test)
However, it will crash if you open the development console and use the getblock command to retrieve a deleted block, so don't do that.
Cases I have not tested yet:
For technical reasons I can't try a -rescan now, can anyone check what happens in such a case so we can fix any bugs that might have been overseen?
worst case scenario: it will crash and you'll have to restore the deleted/renamed blocks.
Edit: not sure if this works for p2pool mining as without the blocks and without full txindex you can't verify the transaction chains. is this necessary or does this only matter to p2pool operators, not miners?
Edit2: miners don't need the blockchain, deleting (or renaming..) blocks will work fine :) (just remember to let it finish indexing a blk file before you delete it)
Edit3: I think the confusion stems from the fact that 387943 thought the merkle tree was stored in the blk*.dat files :D
duh, i knew nobody could be seriously this retarded.
btw, BTCisGod is a real bitcoiner, he was just asking legit questions so don't hate him. he's not connected to the insane number.
submitted by iuoiuo to Bitcoin [link] [comments]

Import Mycellium wallet into Bitcoin-QT?

I'm trying to backup my Mycellium wallet to my Bitcoin Core
I tried the 'importprivkey' command in Bitcoin-QT with my Mycellium private key. But i get this error:
Invalid private key encoding (code -5)
Can any of you redditors suggest a fix?
My private key exported from Mycellium has 114 characters if that helps.
submitted by excidius to Bitcoin [link] [comments]

Multi-signature address (P2SH) paper wallet

Hey! I've prototyped a multisignature P2SH address paper wallet: http://maraoz.github.io/multipape
The basic idea is: instead of generating just 1 private-public keypair for your paper wallet, you generate 3 pairs, and create an address from which you can only redeem coins by signing with 2-of-3 private keys. This allows you to save the 3 private keys in separate physical locations (or give them to friends/family) for enhanced security.
Note that the app generates 7 QR codes for each address. Each of the 3 keypairs has 2 QR codes, one for the public key, and one for the private key. The remaining big QR code is the P2SH address. The address starts with 3 in livenet, instead of the typical 1, or with 2 in testnet, instead of the typical m/n.
I checked the results comparing them to:
This app uses the http://bitcore.io/ framework, browser version.
I'd love to hear feedback for the app: regarding security, usefulness, user interface, etc. so I can improve it. Hope you like it, and feel free to ask any questions! :)
submitted by maraoz to Bitcoin [link] [comments]

[TUTORIAL] Vanity bitcoin addresses: how to generate them yourself!

Hey y'all!
Although most of you probably know how this is done, I thought I'd take some time and help newer Bitcoin users that want to get their own vanity Bitcoin address. The program that I will be using is Vanitygen, and my wallet is stored on blockchain.info. This can also be done with the Bitcoin-Qt client.
Instructions
  1. Download Vanitygen right over here. Extract the contents of the zip archive into a folder.
  2. Open a command prompt/terminal. If you are using Windows, this can be done by pressing WinKey + R, and then typing cmd.
  3. Type cd followed by a space and the path to the folder where Vanitygen is extracted. For example, if you saved Vanitygen in a folder named eggs on your desktop, you will likely type cd C:\Users\YourUsername\Desktop\eggs.
  4. Type vanitygen64 or vanitygen, followed by a space and the desired prefix of your Bitcoin address. You can use the -i flag to make it not case sensitive. For example, if you want your address to begin with 1Hello, type vanitygen64 1Hello. If you do not care about case, type vanitygen64 -i 1Hello.
  5. Wait a while. Depending on the length of the prefix entered and how fast your computer is, it can take anywhere from 10 seconds to a very, very long time.
  6. When a match was found, Vanitygen should spit out the address and the private key. Private keys are long strings of characters that start with a 5. Make sure to save the private key, because you'll need it in a minute. You can select it by right-clicking on the command prompt window and clicking Mark, clicking and dragging over the private key, and then pressing enter to copy it.
In the next few steps, I'll show you how to import this key on blockchain.info and Bitcoin-Qt.
Blockchain.info wallet
  1. Log in to your blockchain wallet, and then click the Import / Export tab near the top of the page. If you receive a warning, click I Understand.
  2. Under Import Private Key, paste in the private key that Vanitygen gave you. Click Import Directly, not Sweep Key, otherwise you won't be able to use the new address you generated.
  3. Congratulations! You now have a vanity address. Click the Receive Money tab to check it out.
Bitcoin-Qt wallet
  1. Open the wallet, and click Help > Debug window.
  2. A window should appear with a text box. If your wallet is encrypted, type walletpassphrase "Your Password" 500. This will unlock your wallet for 500 seconds, allowing you to import your private key.
  3. Now, it's time to import your private key. Type importprivkey YourPrivateKey "AnyLabelYouWant". This can take quite a while, and the client will usually stop responding. Once it is finished, you will likely have to restart the client to see the new address in the Receive coins tab.
  4. There isn't a step 4. You are already done. Celebrate!
I hope you learned something from this tutorial/it helped you a bit/you are slightly less bored. If there is anything that I should change, or you need any help, leave me a comment. Thanks!
submitted by rgamer35 to Bitcoin [link] [comments]

Such dogecoin much vanity wow

Bored of the same old addresses? Random gibberish in your addresses got you confused? Try a vanity address! Instead of D5QG7d8Kt1Ma23oCqvU5Gjvkjv9KZxmC4x you'll get something like DFatherM2z6dscSFBtKS7yD9DHpF42pimF
Shibe 1: Download this https://en.bitcoin.it/wiki/Vanitygen
Shibe 2: Make / open the file you downloaded. (If you're new to this, and using windows, you need to get to the folder you unzipped through the command prompt.)
Shibe 3: Run the command ./vanitygen -X 30 DKeyword
Shibe 4: Dig.
Shibe 5: Once it has found a match, copy the privkey. Open up the Dogecoin QT client.
Shibe 6: Go to Help > Debug > Console
Shibe 7: Type importprivkey PRIVKEYCOPYHERE labelofkey
Shibe 8: The most important step, have fun with your new vanity address.
Such vanity: DFatherM2z6dscSFBtKS7yD9DHpF42pimF
submitted by Shadedjon to dogecoin [link] [comments]

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Bitcoin-cli Importprivkey Bitcoin . Bitcoin-cli Importprivkey . Apr 16, 2018 DTN Staff. twitter. pinterest. google plus. facebook. Bitcoin Core Version 0.15.0 Released 14 September 2017 ... bitcoin-qt importprivkey from vanitygen. Posted on 20130704 by joshua. Generate a custom address with vanitygen (version 0.22): vanitygen -o matches.txt 1pattern. It will output a ‘Privkey’ and ‘Address’ to matches.txt. Make sure to have an archived copy of the wallet.dat file before following the rest of these instructions! Go to bitcoin-qt (version 0.8.3), open the RPC console window ... importprivkey is an RPC command on bitcoind that allows a private key to be added to a wallet.. This is a Bitcoin 0.6.0 feature and is available in the 0.6 release candidates and later. $ bitcoind help [...] importprivkey <bitcoinprivkey> [label] Since Bitcoin-QT/bitcoind v0.6.0, you can import private keys using built-in RPC command importprivkey. Before v0.6.0, you needed to rely on third-party wallet.dat manipulation tool such as Pywallet . Since Bitcoin-QT/bitcoind v0.6.0, you can import private keys using built-in RPC command importprivkey. Before v0.6.0, you needed to rely on third-party wallet.dat manipulation tool such as Pywallet. This article describes how to import a private key through the RPC API of bitcoind, which is a topic for advanced users. Note that importing a key to bitcoind and/or Bitcoin-Qt may be dangerous ...

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