Brainwallet Generator Secure Bitcoin Wallet Generator

Gridcoin 5.0.0.0-Mandatory "Fern" Release

https://github.com/gridcoin-community/Gridcoin-Research/releases/tag/5.0.0.0
Finally! After over ten months of development and testing, "Fern" has arrived! This is a whopper. 240 pull requests merged. Essentially a complete rewrite that was started with the scraper (the "neural net" rewrite) in "Denise" has now been completed. Practically the ENTIRE Gridcoin specific codebase resting on top of the vanilla Bitcoin/Peercoin/Blackcoin vanilla PoS code has been rewritten. This removes the team requirement at last (see below), although there are many other important improvements besides that.
Fern was a monumental undertaking. We had to encode all of the old rules active for the v10 block protocol in new code and ensure that the new code was 100% compatible. This had to be done in such a way as to clear out all of the old spaghetti and ring-fence it with tightly controlled class implementations. We then wrote an entirely new, simplified ruleset for research rewards and reengineered contracts (which includes beacon management, polls, and voting) using properly classed code. The fundamentals of Gridcoin with this release are now on a very sound and maintainable footing, and the developers believe the codebase as updated here will serve as the fundamental basis for Gridcoin's future roadmap.
We have been testing this for MONTHS on testnet in various stages. The v10 (legacy) compatibility code has been running on testnet continuously as it was developed to ensure compatibility with existing nodes. During the last few months, we have done two private testnet forks and then the full public testnet testing for v11 code (the new protocol which is what Fern implements). The developers have also been running non-staking "sentinel" nodes on mainnet with this code to verify that the consensus rules are problem-free for the legacy compatibility code on the broader mainnet. We believe this amount of testing is going to result in a smooth rollout.
Given the amount of changes in Fern, I am presenting TWO changelogs below. One is high level, which summarizes the most significant changes in the protocol. The second changelog is the detailed one in the usual format, and gives you an inkling of the size of this release.

Highlights

Protocol

Note that the protocol changes will not become active until we cross the hard-fork transition height to v11, which has been set at 2053000. Given current average block spacing, this should happen around October 4, about one month from now.
Note that to get all of the beacons in the network on the new protocol, we are requiring ALL beacons to be validated. A two week (14 day) grace period is provided by the code, starting at the time of the transition height, for people currently holding a beacon to validate the beacon and prevent it from expiring. That means that EVERY CRUNCHER must advertise and validate their beacon AFTER the v11 transition (around Oct 4th) and BEFORE October 18th (or more precisely, 14 days from the actual date of the v11 transition). If you do not advertise and validate your beacon by this time, your beacon will expire and you will stop earning research rewards until you advertise and validate a new beacon. This process has been made much easier by a brand new beacon "wizard" that helps manage beacon advertisements and renewals. Once a beacon has been validated and is a v11 protocol beacon, the normal 180 day expiration rules apply. Note, however, that the 180 day expiration on research rewards has been removed with the Fern update. This means that while your beacon might expire after 180 days, your earned research rewards will be retained and can be claimed by advertising a beacon with the same CPID and going through the validation process again. In other words, you do not lose any earned research rewards if you do not stake a block within 180 days and keep your beacon up-to-date.
The transition height is also when the team requirement will be relaxed for the network.

GUI

Besides the beacon wizard, there are a number of improvements to the GUI, including new UI transaction types (and icons) for staking the superblock, sidestake sends, beacon advertisement, voting, poll creation, and transactions with a message. The main screen has been revamped with a better summary section, and better status icons. Several changes under the hood have improved GUI performance. And finally, the diagnostics have been revamped.

Blockchain

The wallet sync speed has been DRASTICALLY improved. A decent machine with a good network connection should be able to sync the entire mainnet blockchain in less than 4 hours. A fast machine with a really fast network connection and a good SSD can do it in about 2.5 hours. One of our goals was to reduce or eliminate the reliance on snapshots for mainnet, and I think we have accomplished that goal with the new sync speed. We have also streamlined the in-memory structures for the blockchain which shaves some memory use.
There are so many goodies here it is hard to summarize them all.
I would like to thank all of the contributors to this release, but especially thank @cyrossignol, whose incredible contributions formed the backbone of this release. I would also like to pay special thanks to @barton2526, @caraka, and @Quezacoatl1, who tirelessly helped during the testing and polishing phase on testnet with testing and repeated builds for all architectures.
The developers are proud to present this release to the community and we believe this represents the starting point for a true renaissance for Gridcoin!

Summary Changelog

Accrual

Changed

Most significantly, nodes calculate research rewards directly from the magnitudes in EACH superblock between stakes instead of using a two- or three- point average based on a CPID's current magnitude and the magnitude for the CPID when it last staked. For those long-timers in the community, this has been referred to as "Superblock Windows," and was first done in proof-of-concept form by @denravonska.

Removed

Beacons

Added

Changed

Removed

Unaltered

As a reminder:

Superblocks

Added

Changed

Removed

Voting

Added

Changed

Removed

Detailed Changelog

[5.0.0.0] 2020-09-03, mandatory, "Fern"

Added

Changed

Removed

Fixed

submitted by jamescowens to gridcoin [link] [comments]

Windows / Linux Guide to using Trezor with Bitcoin Core (HWI)

This is a guide to using your Trezor with Bitcoin Core. It may seem like more trouble than it's worth but many applications use Bitcoin Core as a wallet such as LND, EPS, and JoinMarket. Learning how to integrate your Trezor into a Bitcoin Core install is rather useful in many unexpected ways. I did this all through the QT interfaces, but it's simple to script. There is a much simpler guide available from the HWI github, and the smallest Linux TLDR is here
Unfortunately, I don't have access to a Coldcard or Ledger. I'm not sure how the setpin or -stdinpass parameters are handled on that HW.

( A ) Install TrezorCTL, HWI, and build GUI

You only need to set the wallet up once, but may repeat to upgrade

( A.I ) Download extract and install HWI

  1. Download and isntall Python
  2. Download https://github.com/bitcoin-core/HWI/archive/1.1.2.zip
  3. Extract it to a working folder (assumes C:\User\Reddit\src\HWI)
  4. Change Directory (cd) to working folder cd "C:\User\Reddit\src\HWI"
  5. Setup venv python -m venv .venv
  6. Enter venv .venv\Scripts\activate.bat 1
  7. Install dependencies python -m pip install -U setuptools pip wheel
  8. Install TrezorCTL python -m pip install trezor[hidapi]
  9. Install HWI python -m pip install hwi pyside2
  10. Download github.com/libusb/libusb/releases/download/v1.0.23/libusb-1.0.23.7z
  11. Extract MS64\dll\libusb-1.0.dll from the archive
  12. Copy to pywin copy libusb-1.0.dll .venv\Lib\site-packages\pywin32_system32\

( A.II ) Build the QT UI files

  1. Download and install MSYS2
  2. Launch a mingw64.exe shell
  3. CD to working folder cd "C:\User\Reddit\src\HWI"
  4. Enter venv source .venv/Scripts/activate 1
  5. Run UI build bash contrib/generate-ui.sh

( B ) Create a Trezor wallet in Bitcoin Core (testnet)

You only need to set the wallet up once, no private key data is stored, only xpub data

( B.I ) Retrieve keypool from HWI-QT

  1. Launch hwi-qt.exe --testnet (assuming testnet)
  2. Click Set passphrase (if needed) to cache your passphrase then click Refresh
  3. Select you trezor from the list then click Set Pin (if needed)
  4. Ensure your Trezor in the dropdown has a fingerprint
  5. Select Change keypool options and choose P2WPKH
  6. Copy all the text from the Keypool textbox

( B.II ) Create the wallet in Bitcoin QT

  1. Launch Bitcoin Core (testnet) (non-pruned) 2
  2. Select Console from the Window menu
  3. Create a wallet createwallet "hwi" true
  4. Ensure that hwi is selected in the console wallet dropdown
  5. Verify walletname using the getwalletinfo command
  6. Import keypool importmulti '' (note ' caging)
  7. Rescan if TXNs are missing rescanblockchain 3

( C.I ) Grab Tesnet coins

  1. Select the Receive tab in Bitcoin Core (testnet)
  2. Ensure that the Wallet dropdown has hwi selected
  3. Select Create new receiving address and copy address
  4. Google "bitcoin testnet faucet" and visit a few sites
  5. Answer captcha and input your addressed copied from C.I.3

( D ) Spending funds with HWI

This is how you can spend funds in your Trezor using Bitcoin Core (testnet)

( D.I ) Create an unsigned PSBT

  1. Select the Send tab in Bitcoin Core (testnet)
  2. Ensure that the Wallet dropdown has hwi selected
  3. Verify your balance in Watch-only balance
  4. Rescan if balance is wrong (see B.II.7) 3
  5. Craft your TXN as usual, then click Create Unsigned
  6. Copy the PSBT to your clipboard when prompted

( D.II ) Sign your PSBT

  1. In HWI-QT click Sign PSBT
  2. Paste what you copied in D.I.6 in PSBT to Sign field
  3. Click Sign PSBT
  4. Copy the text for PSBT Result

( D.III ) Broadcast your TXN

  1. Select the Console window in Bitcoin Core (testnet)
  2. Ensure that the Wallet dropdown has hwi selected
  3. Finalize PSBT: finalizepsbt
  4. Copy the signed TXN hex from the hex field returned
  5. Broadcast TXN: sendrawtransaction

Final Thoughts

I did this all through the GUI interfaces for the benefit of the Windows users. Windows console is fine, but the quote escaping in windows console is nightmarish. Powershell would be good, but that throws this on a whole another level for most Windows folks.
There is also the need to use HWI-QT due to a bug in blank passphrases on the commandline. You can work around it by toggling passphrase off or on, but again, it's more than I wanted to spell out.
Footnotes:
  • 1. - Later version of python put the activate script under 'bin' instead of 'Script'
  • 2. - You can run pruned, but you need to have a fresh wallet
  • 3. - Rescan is automatic on 'importmulti' but I was pruned so it was wierd
submitted by brianddk to Bitcoin [link] [comments]

Windows Guide to using Trezor with Bitcoin Core (HWI)

This is a guide to using your Trezor with Bitcoin Core. It may seem like more trouble than it's worth but many applications use Bitcoin Core as a wallet such as LND, EPS, and JoinMarket. Learning how to integrate your Trezor into a Bitcoin Core install is rather useful in many unexpected ways. I did this all through the QT interfaces, but it's simple to script. There is a much simpler guide available from the HWI github, and the smallest TLDR is here

( A ) Install TrezorCTL, HWI, and build GUI

You only need to set the wallet up once, but may repeat to upgrade

( A.I ) Download extract and install HWI

  1. Download and isntall Python
  2. Download https://github.com/bitcoin-core/HWI/archive/1.1.2.zip
  3. Extract it to a working folder (assumes C:\User\Reddit\src\HWI)
  4. Change Directory (cd) to working folder cd "C:\User\Reddit\src\HWI"
  5. Setup venv python -m venv .venv
  6. Enter venv .venv\Scripts\activate.bat 1
  7. Install dependencies python -m pip install -U setuptools pip wheel
  8. Install TrezorCTL python -m pip install trezor[hidapi]
  9. Install HWI python -m pip install hwi pyside2
  10. Download github.com/libusb/libusb/releases/download/v1.0.23/libusb-1.0.23.7z
  11. Extract MS64\dll\libusb-1.0.dll from the archive
  12. Copy to pywin copy libusb-1.0.dll .venv\Lib\site-packages\pywin32_system32\

( A.II ) Build the QT UI files

  1. Download and install MSYS2
  2. Launch a mingw64.exe
  3. CD to working folder cd "C:\User\Reddit\src\HWI"
  4. Enter venv source .venv/Scripts/activate 1
  5. Run UI build bash contrib/generate-ui.sh

( B ) Create a Trezor wallet in Bitcoin Core (testnet)

You only need to set the wallet up once, no private key data is stored, only xpub data

( B.I ) Retrieve keypool from HWI-QT

  1. Launch hwi-qt.exe --testnet (assuming testnet)
  2. Click Set passphrase (if needed) to cache your passphrase then click Refresh
  3. Select you trezor from the list then click Set Pin (if needed)
  4. Ensure your Trezor in the dropdown has a fingerprint
  5. Select Change keypool options and choose P2WPKH
  6. Copy all the text from the Keypool textbox

( B.II ) Create the wallet in Bitcoin QT

  1. Launch Bitcoin Core (testnet) (non-pruned) 2
  2. Select Console from the Window menu
  3. Create a wallet createwallet "hwi" true
  4. Ensure that hwi is selected in the console wallet dropdown
  5. Verify walletname using the getwalletinfo command
  6. Import keypool importmulti '' (note ' caging)
  7. Rescan if TXNs are missing rescanblockchain 3

( C.I ) Grab Tesnet coins

  1. Select the Receive tab in Bitcoin Core (testnet)
  2. Ensure that the Wallet dropdown has hwi selected
  3. Select Create new receiving address and copy address
  4. Google "bitcoin testnet faucet" and visit a few sites
  5. Answer captcha and input your addressed copied from C.I.3

( D ) Spending funds with HWI

This is how you can spend funds in your Trezor using Bitcoin Core (testnet)

( D.I ) Create an unsigned PSBT

  1. Select the Send tab in Bitcoin Core (testnet)
  2. Ensure that the Wallet dropdown has hwi selected
  3. Verify your balance in Watch-only balance
  4. Rescan if balance is wrong (see B.II.7) 3
  5. Craft your TXN as usual, then click Create Unsigned
  6. Copy the PSBT to your clipboard when prompted

( D.II ) Sign your PSBT

  1. In HWI-QT click Sign PSBT
  2. Paste what you copied in D.I.6 in PSBT to Sign field
  3. Click Sign PSBT
  4. Copy the text for PSBT Result

( D.III ) Broadcast your TXN

  1. Select the Console window in Bitcoin Core (testnet)
  2. Ensure that the Wallet dropdown has hwi selected
  3. Finalize PSBT: finalizepsbt
  4. Copy the signed TXN hex from the hex field returned
  5. Broadcast TXN: sendrawtransaction

Final Thoughts

I did this all through the GUI interfaces for the benefit of the Windows users. Windows console is fine, but the quote escaping in windows console is nightmarish. Powershell would be good, but that throws this on a whole another level for most Windows folks.
There is also the need to use HWI-QT due to a bug in blank passphrases on the commandline. You can work around it by toggling passphrase off or on, but again, it's more than I wanted to spell out.
Footnotes:
  • 1. - Later version of python put the activate script under 'bin' instead of 'Script'
  • 2. - You can run pruned, but you need to have a fresh wallet
  • 3. - Rescan is automatic on 'importmulti' but I was pruned so it was wierd
submitted by brianddk to TREZOR [link] [comments]

Guide for novice crypto investors

Bitcoin is a decentralized system, any user of which could control the movement of their own funds. You can use the currency to make transactions, pay for purchases, receive transfers, and exchange it for cash. For transactions, a special address is used, encrypted with a 16-character key. The buyer decodes the code to transfer bitcoins to the specified address.

Bitcoin Mining

Mining is a process that ensures the security of the BTC system, which adds new blocks to the blockchain in chronological order (new transactions). Blocks are added when the codes are decrypted, the transaction is completed, and bitcoins are transferred or exchanged.
The main cryptocurrency is generated by miners using software that solves cryptographic problems. The reward for a new block is agreed by all network participants, but usually amounts to 12.5 bitcoins. Part of the user fees for transactions also goes to reward the miners. Cryptographic tasks become more complex every year to prevent inflation (mining complexity).

Features of the transaction

  1. Anonymity. The address that Bitcoin is sent to consists of 30 characters. You can track the flow of transactions, but the address is not always associated with a real person.
  2. Security. The balance of bitcoins is fixed in a cryptographic system with a public key. Only the owner of a private key can send cryptocurrency to other addresses.
  3. Unable to cancel. It is no longer possible to cancel the transaction after the transaction has been completed.
  4. Deregulation. Everyone can use cryptocurrency.
  5. Coverage and speed. Information about the transaction is transmitted incredibly quickly, and confirmation is received within a few minutes. No one knows the buyer’s physical location.

Where to buy Bitcoin?

There are Deposit systems that use crypto-exchanges. So, to buy Bitcoin, you will first need to top up your balance, buy the digital currency itself, and then withdraw it to your Bitcoin wallet, paying a Commission for withdrawing coins. The cheapest method of buying is buying on the stock exchange. The exchange rate is as close as possible to the market rate.

BTC rate

The current exchange rate of the coin is calculated based on the average price on the largest currency exchanges. For example, you can track the exchange rate on our Bitniex exchange. The Bitcoin exchange rate is constantly changing, during the day it can change by 10% in one direction or another.

The choice of crypto-currency wallet

A cryptocurrency wallet is a place where digital currency will be stored. The most secure method of storage is using paper or electronic wallets.

TOP secure cryptocurrency wallets

These wallets are one of the most secure crypto wallets in the world:
submitted by Bitniex to Bitniex [link] [comments]

Wallet Recovery Help

Hello!
I’m seeking help from the /bitcoin community to recover lost funds from a wallet.dat file. Someone I know asked me to help recover their lost funds - but I’m stumped and now seeking help from the experts.
Facts
Problems
Questions
I was under the impression that the wallet.dat file contained a private key which corresponds to any / all newly created receiving addresses, but I must be mistaken.
Any advice would be greatly appreciated. The person is at a dead end and I'm fresh out of ideas.
Thank you
submitted by DominusVobiscum_ to Bitcoin [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]

I want to remove my BTC from an online exchange... where to?

Title says it all really - not overly happy with them sitting on a server somewhere with all the recent legislation about centralised exchanges.
Where can I move them where I don't have toworry about any of this?
Cheers!
submitted by do_you_realise to Bitcoin [link] [comments]

Transaction hasn't confirmed even once in over 24 hours

Can anyone tell me why this transaction hasn't confirmed? Thanks in advance! 1 BTC sent from wallet in bitcoin-qt (core) 0.8.6
TX info from blockcypher: https://live.blockcypher.com/btc/address/1CHz7rsNnec9BEyoyCc1wbbmzC33DtuVj4/
submitted by redditrho to btc [link] [comments]

Fed Banker Tries Criticizing Bitcoin, Ends Up Perfectly Describing The Fed

Fed Banker Tries Criticizing Bitcoin, Ends Up Perfectly Describing The Fed submitted by TheAgoristReport to Anarcho_Capitalism [link] [comments]

Lost 7.6 BTC last night. seems bug of Bitcoin-QT client

I’m using Bitcoin-QT v0.10.0 (64-bit) on a Macbook Pro. Last night I withdraw 7.6 BTC from hashnest.com. I copied the receiving address from the client and this address was never used before. The receiving address is 1QBhGLEMM7fGAMk3uXNV6VqfTfg3TFawKc. The tx url https://blockchain.info/address/1QBhGLEMM7fGAMk3uXNV6VqfTfg3TFawKc However, just 1 second later these btc was transfered to 16jum8CHKv6g1rLiCzrcP9Qc7k1ww4XXgx in another transaction. https://blockchain.info/address/3QJmV3qfvL9SuYo34YihAf3sRCW3qSinyC
16jum8CHKv6g1rLiCzrcP9Qc7k1ww4XXgx has many transactions with 3QJmV3qfvL9SuYo34YihAf3sRCW3qSinyC. The latter address is marked as "gavinandresen Multisig Test" and linked to https://gist.github.com/gavinandresen/3966071 .
1QBhGLEMM7fGAMk3uXNV6VqfTfg3TFawKc was generated by Bitcoin-QT. Here is screenshot: http://tinypic.com/2e2j9g9/8
Anyone could explain this?
submitted by Lizza2015 to Bitcoin [link] [comments]

Backup after every 100 send/receive transactions?

I thought you only had to backup the wallet once, but apparently you have to do it every 100 transactions because the wallet.dat only contains 100 private keys.
Does anyone understand this better, what would happen if you restore a wallet.dat that had since had more than 100 transactions made?
If this is the case shouldn't bitcoin.org make it more clear that its important to make regular backups?
submitted by danster82 to Bitcoin [link] [comments]

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]

Paper Wallets: Not *your* wallet.

I have started seeing paper wallet vendors pop up everywhere. Just a friendly reminder, if you didn't generate the keys and print the wallet yourself then it is not your wallet. It is someone else's wallet.
I haven't looked because I can graphic design well enough for myself, but if these guys are selling blank pieces of pretty paper with a white square or two for you to print the QR codes in yourself, then that's great. But from the looks of it these are pre-generated addresses that you don't own because you didn't generate them.
Sure, they "delete the keys from memory", "generated on a machine not connected to the internet", and so on... but that's only as good as their word.
If people are that stupid I suggest everyone with the capability start selling paper wallets they generated, but keep the private keys (and promise your customers you "delete them after printing" or whatever you need to in order to satisfy their concerns. After a year of selling them, load all the private keys, copy the btc to your own wallet, and retire somewhere with a new name. Most of these victims will not realize the coins are gone for years, after all the paper wallet is safely stored in their safety deposit box... right?
submitted by highguy420 to Bitcoin [link] [comments]

FOUND MY PRIVATE KEYS! But I need help determine the order. I have 11.171 BTC, I'll give 1.17 btc if you can order them correctly

Like title says
submitted by LAkingsAK to Bitcoin [link] [comments]

Importing private keys into Bitcoin-qt /r/Bitcoin

Importing private keys into Bitcoin-qt /Bitcoin submitted by BitcoinAllBot to BitcoinAll [link] [comments]

Please help me understand Electrum deterministic wallet and its "seeds". I want to know how to best secure my wallet / private keys.

I'm looking around for a Bitcoin software wallet that would simply have a built in "file encryption/decryption" feature.
If I understand correctly, when I attach a passphrase to my wallet/private key, everyone knowing that passphrase could have access to my private key without having access to the file itself. I find that less secure then having the file locally encrypted by the Bitcoin client. This way, an attacker would have to have access to the passphrase AND the file.
Now how does Electrum "seeds" work? I'm assuming they work similar to tying a passphrase to a private key in the Bitcoin-QT client and that you don't need access to the file. I see a flaw/weakness in that.
Any software wallet out there that let you decide where to keep the wallet.dat file and that automatically encrypt/decrypt it? Otherwise, I think manually encrypting and then decrypting the wallet.dat with a third party software to perfom transactions would be the safest way to go about it.
What do you guys think? Anyone can help?
submitted by TheGh0st1 to Bitcoin [link] [comments]

How would you store bitcoins so you need 2 out of 3 passwords to recover them?

Possibly something not using any external service, so not storing them in a place where they offer this service, but if the place goes down you lose your bitcoins.
Thanks
submitted by pietrosperoni to BitcoinBeginners [link] [comments]

Blockchain.info and Bitcoin-Qt wallet values are different.

In my Bitcoin-Qt wallet, it says I have 1.085 BTC but when I look at my address in Blockchain.info it says I have 1.019 BTC.
I looked through the transaction history for both and it seems almost all of my sent values are higher on Blockchain then in Qt. (Last 7 Transactions)
Does anyone know the reason for this? I know that the one's in my Qt wallet are the correct amounts I sent, but why are the one's on Blockchain different?
I've already re-downloaded the block chain on my QT wallet. and it still showed the same value.
submitted by walterwitt to Bitcoin [link] [comments]

Wallets are like magic! They can do so much, but I do have some questions...

Been involved in bitcoin a few weeks now, aware for a few months, bought in a 19 (woo!), anyway, wallets are still a bit mystifying and magical and multi-headed.
What's amazing to me is this site: www.bitaddress.org
Under the tab "wallet details" it's able to calculate a public address from just the private key? How is that possible?
So, if I lose my public address and only have my private key, I can find the address using this site, and ostensibly the bitcoin spec provides details on how to recover the public addy mathematically so others could do the same, so technically all we really need to save is the private key? Is that correct? If you lost your wallet.dat file but still had your private key, you still have your bitcoins, yes?
The bulk wallet is interesting too, allowing a company to generate as many addresses as needed for individual transactions. Do all these addresses unlock with the same private-key? That's pretty amazing.
The paper wallet is interesting, some have suggested handing these out to waiters in lieu of tips, the idea being you send the tip to the paper address via smartphone on the spot after your meal.
And finally the brain wallet, the one that's going to get a lot of people in trouble. Ultimately, I think a lot of fortunes will be secured by a brain-wallet simply because you don't need anything physical to secure your wallet. There's nothing to lose. But on the other hand, forget your passphrase, or make one too weak, and you're completely screwed. Anyone, anywhere, if they can guess your passphrase can check to see if the address that results from their guess has any coins in it, and since the private key results from the passphrase, they can take your coins!
But, for short-term bitcoin smuggling, such as if you had to cross a military border or something, there'd be no more savvy way to do it than with a brainwallet, just keep it there short-term.
But I have no doubt that hundreds of years from now we'll still have people mining passphrases hoping to hit the jackpot, and occasionally they'll find some.
So, to recap, one private key can work with many public addresses, yes? So you could generate an address to receive funds, and then generate a new address to send those same funds, does that work? Or are you stuck with one public address and have to move linearly between generated one?
Fire scares me. How many people will lose their bitcoin addys and keys to fire? I've been thinking of creating a cold-storage wallet and engraving the details on a steel plate :P What do you guys think. Fireproof.
submitted by Anenome5 to Bitcoin [link] [comments]

Missing my BTC change from using Bitcoin-QT.

I usually use blockchain wallet and I decided to transfer 70BTC to my desktop wallet with bitcoin-qt. I imported the private key of my blockchain address and sent 0.008btc to my new address that bitcoin-qt generated as a test...
Well on my Blockchain.info transaction history, it shows that I send the opposite (change) of 69.9915 BTC to some address, which is not listed in my bitcoin-qt address book...
Did I just lose 70BTC? My bitcoin-qt client still says I have a balance of 70BTC, but I don't know which address it's in and blockchain says I have 0 btc.
This is the transaction history of blockchain: https://blockchain.info/address/1K5hLyguMutgKH3p2E9v1irf1AwY8T993Z
submitted by wheyjuice to Bitcoin [link] [comments]

Question: What happens if two wallets share the same address?

As I understand it, your wallet is nothing more than a digital key, if you will, allowing you access to funds assigned to a specific address.
What happens if two wallets share the same key? Would the funds be accessible by either wallet? An analogy would be a safe-deposit box where you can't be sure you have the only customer key. If someone else had access to that box, there wouldn't be any way to stop them from getting to your funds.
Other than the sheer number of available addresses, are there any sort of preventive measures can I take to ensure that I'm the only one using my specific private key?
submitted by drinkmorecoffee to Bitcoin [link] [comments]

Offline wallet questions

I've heard that if you are going to buy bitcoins, you should store them in an offline wallet to keep them safe. People are saying that it's best to have a computer that's never been connected to the internet. I am just wondering why that is? Say I want to use my laptop and just switch the wireless off before I create the wallet, and then leave it off as long as I store it. Is it possible for that to be compromised? It has been connected to the internet before, but I don't see why that is a disadvantage.
submitted by thecoinking to BitcoinBeginners [link] [comments]

Bitcoin Private Key Hacker, Scanner, Scan How to Generate Private Key from a Bitcoin watch only address 2020 Bitcoin private Key and Address with balance generator ... How To Generate Your Own Private Keys for Cryptocurrencies ... How to findee private key bitcoin with balance 2020 - YouTube

Bitgen - Bitcoin address generator. The Bitgen software generates crypto currency addresses from a given or generated random number. The bitsig application is a signature tool that sign and verify bitcoin signatures in various formats. Also included in the package is bitcry, which is a public key encryption tool that encrypt/decrypt using the bitcoin elliptic curve. Brainwallet Generator. If you have trust issues with third-party services (BTC.com, Blockchain.com, BitGo.com, Coinbase.com, etc) securing your Bitcoin, Altcoin, or other Cryptocurrency, you will want a Brainwallet – the most affordable and secure solution today. The initial synchronization is beginning to be a hassle so I thought I might get my key and transfer my wallet to Blockchain.info. I followed the directions in How do I export my private keys from my Bitcoin-QT? to get my private key. All I get back for dumpprivkey[] is: Invalid Bitcoin address (code -5). An example private key. In Bitcoin, a private key is a 256-bit number, which can be represented one of several ways. Here is a private key in hexadecimal - 256 bits in hexadecimal is 32 bytes, or 64 characters in the range 0-9 or A-F. (Note that an ‘easy’ string to find like this does not mean that specific private key can be guessed easily .) Vanitygen. Vanitygen is a command-line vanity bitcoin address generator. If you're tired of the random, cryptic addresses generated by regular bitcoin clients, you can use vanitygen to create a more personalized address.

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Bitcoin Private Key Hacker, Scanner, Scan

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