What is BIP38 Encryption for Your Bitcoin Wallet

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]

PSA: with mempool being cleared, now it's a good time to move your funds from legacy to segwit address

Don't wait until the fees are super high again. Move to segwit and take advantage of extra witness space in the blocks!
submitted by aoeiudhtn to Bitcoin [link] [comments]

To celebrate Labor Day weekend in the USA, here is something I labored over. It's a luxury cold storage device. The BIP38 keys are engraved in Tungsten and sealed in a tamper evident capsule.

To celebrate Labor Day weekend in the USA, here is something I labored over. It's a luxury cold storage device. The BIP38 keys are engraved in Tungsten and sealed in a tamper evident capsule. submitted by ProfBitcoin to Bitcoin [link] [comments]

[Daily Discussion] Wednesday, May 27, 2015

Welcome to the /BitcoinMarkets daily discussion thread!
Thread topics include, but are not limited to:
Thread Guidelines
Other ways to interact
submitted by AutoModerator to BitcoinMarkets [link] [comments]

I've traded all my dogecoins for bitcoins!

Hello bitcoin!
I only have one mining rig and it took a while to mine that 120k dogecoins. Today i traded all my dogecoins for bitcoin and now i've got 0.065 BTC in a cold wallet.
I think i have the worst timing ever but somehow it feels good to hold bitcoin :)
Any advice how i can get more BTC with my 1.6 MHs rig? Are BIP38 encrypted paper wallets safe enough?
Edit: I think i have 3 options now
  1. sell the rig and buy bitcoins
  2. sell the rig and buy an asic miner (if i there are some cheap ones)
  3. keep mining an altcoin and run a full bitcoin node on it
btw: is it possible to run a bitcoin node in a virtual machine?
Edit2: i decided to not sell my mining rig. I want to keep tinkering with it because of the educational value and to keep supporting bitcoin and cryptocurrencies. I'm setting up a full node inside a VM right now. Is there any incentive to host a p2pool?
submitted by shibe05 to Bitcoin [link] [comments]

Ideas for really safe Cold Storage

The Three Legged Stool of safe storage. I've given a lot of thought about how I can safely store my Bitcoins. I want to share my method in the hope others may find this helpful and any discussion could also help me. I'm not intending this as a beginners guide to cold storage, plenty already exist. But people, both new and familiar with cold storage, can benefit from the applications and ideas I'm suggesting here.
The Three Legged Stool, what's this about? There are just three ways to unintentionally lose your coins: Leg 1, They can be stolen Leg 2, They can be physically lost Leg 3, You can forget how to access them
The snag is that anything done to improve security to one Leg tends to increase the risk of loss caused by being out of balance with the other two Legs. For example, to protect your coins against Leg 1 (being stolen) you may hide the coins private key in a password protected container somewhere in your house. My point is that you have reduced the risk of Leg 1 (getting them stolen) but at the same time increased the risk of Leg 2 (physically lost) and Leg 3 (forget the password). This is especially true with long term storage. Equally, not using a password protects against Leg 3 but increases the risks from Leg 1 and is of no help against Leg 2. The objective is a balanced stool, keeping your coins safe and also always available for spending.
How it can be done: My preferred method is using Paper Wallets with BIP38 encryption. With secure passwords, these are so safe you can keep multiple copies of the same wallet all over the place. Keep copies at work, at home, at your parents house and even carry the private key QR code with your phone in case you want to spend a chunk of Bitcoins unexpectedly. Brute force attacks on BIP38 wallets are so slow, I can't think it's possible to crack a strong password of let's say 10 random letters, numbers and symbols. So this is total protection against Leg 1 and Leg 2 but forget that password Leg 3.... and your coins are gone forever!
Here's the clever bit. So how can you guarantee never to forget that complex wallet password? Yes! There's an App for that, "Infinite Password Generator" (IPG) is truly brilliant. https://play.google.com/store/apps/details?id=yuku.infinitepassgen.app
The only permission this App has is to access Google Play payment services so I don't think it can give any secrets back to the developer. Install this app and make backups of the APK, save backups on several devices in case it's ever removed from Google Play. If you change your phone you will want to be able to install IPG from your APK backups and it's best not to update this App. If you do update it then always check it is generating the same passwords using the procedure explained below.
IPG generates complex passwords by combining your own "Master Password" with a Keyword. As an example, your Master Password must be something you can NEVER forget like the house number and road name you lived in as a child. The Keyword is a unique identifier for this Paper Wallet, maybe a name and incrementing sequence number like wallet3. IPG combines these two fields to generate a secure repeatable password you can use as the input to the BIP38 encryption.
IPG let's you save its configuration settings and you need to do this: Fill in the Master Password, put your name in the Keyword field, press Show and select the type and length of BIP38 password you want then press Copy (to the clipboard). Now, paste the generated password over the Personal notes (optional) field. Next, delete the Master Password field and Save, then exit IPG.
Open IPG and Load your saved file, fill in Master Password then Copy/paste the generated password under the original copy of the password and if you did this all correctly you will have generated exactly the same password, confirming you put in the Master Password correctly. Now change the Keyword field to your chosen Wallet Identifier, let's use my example above wallet3 and this will generate the required unique password for that BIP38 Paper Wallet you're about to make. I would write 3 as a hint on all copies of this Paper Wallet to make sure I don't forget the full Keyword. The next Paper Wallet I generate being wallet4, marked 4. Also I paste a copy of the IPG generated password into a Truecrypt encrypted container as a last chance disaster recovery.
Final steps to use IPG safely. You must close this App correctly otherwise it stays a while in memory containing all your secret information. Then you need to clear the clipboard of the wallet password and I've been using an App called Clipboard Autoclear+ to do this. https://play.google.com/store/apps/details?id=de.tactilesoftworks.clipboardsentinel
I've used two Paper Wallet generators, my favorite is https://www.bitaddress.org but it's a bit cumbersome to produce multiple copies of the same wallet. I also like https://bitcoinpaperwallet.com because they can produce Testnet Wallets which is a coin identical to Bitcoin but uses valueless coins purely to be for testing purposes. Google Testnet Wallets for more info.
Spending from your Paper Wallet is easier to do than explain and I started by using the Blockchain.info Android App. But this has let me down with an error message "insufficient funds" and I see many complaints about this problem. I wrote to Blockchain.info about it but got no reply. Since then I moved to Mycelium Wallet https://play.google.com/store/apps/details?id=com.mycelium.wallet and have had no problems with this. Also they do a Testnet version of Mycelium which is incredibly useful.
In Mycelium you just scan your Paper Wallets public address to watch how many Bitcoins there are in them. When you want to spend from the Paper Wallet, first run IPG, load the file and fill in the passwords then copy the Paper Wallet password to the clipboard. During the Send transaction Mycelium will ask to scan the wallet Private Key, it then asks for the BIP38 password which you can paste in from IPG and the amount of Bitcoin to send and off it goes.
A couple of important points to consider if you're not spending the full amount from the Paper Wallet. Once your private key has been used like this you really should send the remaining Bitcoins the next Paper Wallet in the sequence called, using my example, wallet4. That's because once a private key has been used or exposed to an online device, it's no longer safe to consider it as cold storage. If you don't spend all the coins on your Paper Wallet it's likely you will get back change and you must be sure the Wallet App you're using supports this or your change will disappear as a donation to the mining community. Mycelium and Blockchain.info Wallets automatically look after sending your change back to the Paper Wallet's corresponding public address. OTHER APPS MIGHT NOT DO THIS SO BE CAREFUL.
Generating Paper Wallets should be done on an offline device such as an old Android phone factory reset and only used for this purpose or a bootable Linux USB.
In conclusion this approach overcomes my doubts about my ability to remember long term secure passwords, possibly years after I made them up, because I shouldn't forget the Master Password as it's something so personal to me and the Keyword is almost attached to the Paper Wallet. Leg 3 is dealt with and Legs 2 and 3 now take care of themselves.
I do hope some of you find these ideas helpful. The developer of IPG Yukuku does not make any provision for donations and I would happily make a donation for this excellent App that is also available for Windows.
Disclaimer, these ideas are for your consideration and debate only. I take no responsibility whatsoever for any losses that may arise however they are incurred. I have absolutely no connection or financial interest in any of the applications I have referred to here.
submitted by LeScarecrow to Bitcoin [link] [comments]

Printer security question for paper wallets

I am about to create a paper wallet to hold bitcoin and want it to be as secure as possible. I have a USB thumb drive (that I do not intend to use afterwards) to boot Linux on a PC to create the wallet, I know I will not be online and will connect to the printer via a cable. But I do not have access to a 'dumb' printer or even one to be a dedicated printer (mine is a Canon MX920). If I use BIP38 encryption will I need to worry about my printer?
submitted by mduncgrad1 to BitcoinBeginners [link] [comments]

Guys, I'm freaking out... My mom wants bitcoins...

My mom doesn't know how to work a browser past buying something on Amazon, and she asks me to invest some money in it for her.
I am active in the bitcoin development community, paper wallets, shamir's secrets, BIP38, all this is nothing for me...
BUT THIS IS MY MOM! The person who brought me into this world wants bitcoins, which is a mind blow in its own right, and she wants ME to take care of them...
My money, I am comfortable with handling, because if I F it up it's my loss, but my mother's money is so much more valuable than mine. I mean, she's my mom, guys.
I'm seriously about to have a breakdown of nervousness / happiness / stress.
Someone just tell me what rational me would tell me, please. Thanks!
submitted by kinoshitajona to Bitcoin [link] [comments]

How it is to use Bitcoin Core for cold storage, and how it should be

We all have our fetishes, and one of mine is creating the ultimate cold storage technique. I hope you will agree that although very cumbersome, it is highly ultimate. Any feedback for improvements is welcome.

Here is the current process I have:

  1. Prepare your cold storage computer. Start with a copy of linux. Encrypt the home folder during setup. Use a strong log in password.
  2. Add Bitcoin Core
  3. Add bitaddress.org
  4. Roll dice to get entropy (d6 needs 62 rolls. d10 needs 48 rolls. d16 needs 40 rolls.)
  5. Stamp entropy into metal plate for durability. I use a d10 so I only need numeric stamps. Metal plate could be a blank square galvanized steel outlet cover.
  6. Decide on a format for converting entropy into a brainwallet phrase. E.g. ENTROPY+PASSWORD+### where ### is a serial number. PASSWORD is a short, easy to remember word to protect you in case someone gets a copy of your entropy.
  7. Open bitaddress.org and input your passphrase into the brainwallet tab.
  8. Copy the private key and import it to Bitcoin Core with importprivkey.
  9. Copy the address and dump it from Bitcoin Core with dumpprivkey.
  10. Dumped private key should match the one created from bitaddress.
  11. Copy the private key and paste it to the "wallet details" tab of bitaddress.
  12. Select the "BIP38 Encrypt" button. Supply a passphrase.
  13. Print out the encrypted private key on paper. Write down the ### index used to produce this address. You can reproduce this address from the entropy on the metal plate if you have to.
  14. When you want to spend the bitcoins, you need a different computer, with tor, Bitcoin Core and enough of the blockchain so that it has the block that funded your cold address.
  15. Disconnect your spending computer from the network.
  16. Importprivkey for the address you wish to spend from. Create your transaction, which should spend always spend the entire wallet balance. Use coin control if this computer has other bitcoins on it.
  17. Connect your spending computer to the network via tor to broadcast. Alternatively you can set walletbroadcast=0 and use the gettransaction RPC call to obtain the signed transaction. Then you can broadcast your transaction using a different computer that has never touched the private key.
Yes, I understand it would be far more convenient to use a hardware wallet. One of my goals here though is to only trust Bitcoin Core. In fact, you may have noticed that I do not even fully trust Bitcoin Core, since bitaddress.org is independently deriving addresses from the entropy.

Here is the process I want:

I would challenge Bitcoin Core to add features to achieve a similar level of security with a much less awkward process. Here's what I have in mind:
  1. Roll dice to create Entropy. Stamp on metal for durability.
  2. On your cold computer, convert entropy into xprivkey.
  3. Import xprivkey to Core.
  4. Export xpubkey from Core.
  5. On your spending computer, import xpubkey.
  6. Make transactions from spending computer. Export unsigned transactions.
  7. Move unsigned transactions to cold computer for signing.
  8. Sign transactions on cold computer.
  9. Move signed transactions to spending computer for broadcast.
  10. Default for Core is to broadcast transactions over tor if tor is installed, even if ordinary node activity is over normal internet.
submitted by moral_agent to Bitcoin [link] [comments]

Bitcoin Mining Software ~ Free Activation Key 2020 - YouTube Cracking Bip38 Encrypted Private Keys of Bitcoins - YouTube Bip38 Bitcoin Encrypted Wallet Charity Challenge Raspberry Pi 4 Bitcoin Mining For 24 Hours! - YouTube How To Crack BitCoin 2019

Bitcoin 2 is a scalable Bitcoin fork with private transactions and instant verified payments. BTC2 is open source and uses a Proof of Stake algorithm. So, back in late 2013 or early 2014 I helped a friend buy some bitcoin and litecoin. I generated a BIP38 bitcoin paper wallet using bitaddress.org, and a BIP38 litecoin paper wallet using liteaddress.org (which, IIUC is a close fork of bitaddress.org). Easy to use, client-side, open-source Bitcoin wallet to send and receive BTC from anywhere, on any device. This is a BIP39 seed. Store your printed seed in a safe & secure place. BIP38. Bitcoin Improvement Protocol 38 (BIP38) provides a way to encrypt a Bitcoin private key with a long passphrase composed of human-readable words. With this extra step of encryption, it’s possible to securely share the encrypted private key with a third-party. It's estimated that renewable energy powers around 74 percent of Bitcoin mining operations. If this is accurate, it would mean that blockchain as an industry is more renewables-driven than almost every other large-scale industry in the world. ... (BIP38) for NFC tags so now everyone can store their Bitcoin safely and encrypted in their hands ...

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Bitcoin Mining Software ~ Free Activation Key 2020 - YouTube

Keep your private keys safe by encrypting them in an industry-standard way. These guys can make you a custom laser-engraved BIP38 card: www.crypto-cards.com ... This video is about cracking of BIP38 Encrypted Bitcoins Private Keys. The cracking speed depends on system CPU. (Here used is i5-7200U. BIP38 is a way to encrypt your Bitcoin private key with a password. For the complete text guide visit: ... What is Bitcoin Mining? (In Plain English) - Duration: 16:01. BIP38 Encrypting of your Bitcoin Private Key - Duration: 10:26. Matthew Smith 11,295 views. 10:26. Bitcoin Trading Guide for Beginners - Bitcoin Whiteboard Tuesday - Duration: 18:48. BIP38 Encrypting of your Bitcoin Private Key - Duration: 10:26. Matthew Smith 11,273 views. 10:26. COMPLETE Shopify Tutorial For Beginners 2020 - How To Create A Profitable Shopify Store From ...

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