How To Use Ian Coleman's BIP39 Tool For Finding Bitcoin ...

HowTo: Create and Spend a Electrum Segwit 3of3 Multisig wallet with Trezors

I wrote a simlar post in Bitcoin about creating a MS wallet without a Trezor, this guide will focus on creating a 3of3 MS wallet with three Trezor's. Hopefully it should be obvious how to extend this to N-of-M for any value of N or M. You can also use this as a blueprint to do MS with non-HW Electrum wallets like Android.
It should be noted that this is the most general case method for setting this up. This allows to replace non-HW Electrum wallets into this procedure where HW-wallets are referenced. For the far simpler method, just pick Cosign with hardware device instead of Cosign with key as I outline here. If you choose Cosign with HW you can do the entire process in one wallet file in one session.
The main advantage of multisig is that it reduces the risk of one compromised seed exposing all your funds. Although this is exceedingly complicated, the added layer of complications make it all the more difficult to compromise your funds. Most of the complexity is on the initial wallet setup. Sending is only a bit more complicated, and Receiving is the same as it would be for any electrum wallet.
We will be creating three wallets here, and each will use a Trezor with its own seed, passphrase, and public key (Zpub). If your just wanting to play with this process you could use one Trezor with three different passphrases. Electrum will treat this like three different wallets, since... well since it is. The Zpubs will be calculated by Electrum.
For all references to wallet passphrases or encryption passwords, I highly recommend you generate six-word passphrases. Three simple ways to construct a six-word passphrase would be to either use EFF diceware long wordlist to roll for 6 words, or create a short six-word BIP39 seed and use that as a passphrase, or create a random Electrum seed and use the last 6 words. You will need to take care that all six-word passphrases are equal or less than 50 characters. Longer passphrases can produce some unexpected results. Whenever you need to create a passphrase or password from here on out, create a six-word string as described above.
Assuming your have your Trezors initialized with passphrases enabled, our first order of business will be ensuring the authenticity of Electrum. For the PC's this must be done with PGP/GPG following the procedure spelled out on the Electrum website, or the secondary docs. It is absolutely critical that you are certain your using the correct ThomasV key. As of the time of this writing, the "correct" ThomasV key was:
ThomasV PGP: 6694 D8DE 7BE8 EE56 31BE D950 2BD5 824B 7F94 70E6
Once your Electrum install is validated, here is excruciating detail on creating and spending from a 3of3 multisig wallet. This assumes you have passphrases enabled on all your Trezors and that each has a unique name. For simplicity I will simply refer to their names at "trez-1", "trez-2", and "trez-3"

Three Wallet Creation passes

Do the following first for "trez-1", then for "trez-2" and finally for "trez-3". The order is VERY important:
  1. Wallet->New, name your wallet
  2. Then insert your Trezor ("trez-1", "trez-2", or "trez-3")
  3. Choose Multisig Wallet, then 3of3
  4. Choose Use a hardware device
  5. Select device
  6. Craft (and record) a new 6 word passphrase
  7. Choose Native Segwit derivation
  8. Record Zpub
  9. Unplug your Trezor ("trez-1", "trez-2", or "trez-3")
  10. Choose Add Cosigner Key
  11. Wait at "Add Cosigner 2" dialog

Distribute Zpubs to Finish Wallet Creation

When completing the setup for each wallet below you will be prompted for a wallet encryption password. I recommend you craft a unique six-word string as described above. If Electrum asks to reconnect to your HW wallet simply say "No". You will notice that the order is the reverse of the previous portion. As before, the order is VERY important,.
  1. Swap over to your trez-3 wallet
  2. Click "Enter Cosigner Key"
  3. Enter trez-1 Zpub
  4. Click "Enter Cosigner Key"
  5. Enter trez-2 Zpub
  6. Swap over to your trez-2 wallet
  7. Click "Enter Cosigner Key"
  8. Enter trez-3 Zpub
  9. Click "Enter Cosigner Key"
  10. Enter trez-1 Zpub
  11. Swap over to your trez-1 wallet
  12. Click "Enter Cosigner Key"
  13. Enter trez-2 Zpub
  14. Click "Enter Cosigner Key"
  15. Enter trez-3 Zpub
You can now close each wallet file.
You should now have recorded:
Keep the 12 secrets secure, separate and safe.

Receive funds into your 3of3 MS wallet

Receive just like any other wallet. All three wallets will watch the same set of addresses

Spend funds from your 3of3 MS wallet

  1. Create a TXN as you normally would on your first device
  2. In the TXN dialog hit "Preview" instead of Send
  3. In the Preview screen hit "Sign", then "Export"
  4. Copy the TXN over to your second device
  5. On your second device click Tools->Load Transaction
  6. Enter your partially signed TXN
  7. Verify the Status reads "Partially signed (1/3)"
  8. In the Preview screen hit "Sign", then "Export"
  9. Copy the TXN over to your third device
  10. On your third device click Tools->Load Transaction
  11. Enter your partially signed TXN
  12. Verify the Status reads "Partially signed (2/3)"
  13. In the Preview screen hit "Sign", then "Broadcast"

Conclusion

Certainly more complicated than a non MS wallet, but a lot more secure. Also be aware that the Segwit MS TXNs are about 40% larger than the native Segwit TXNs, so this does generate some additional cost in TXN fees.
submitted by brianddk to TREZOR [link] [comments]

12632 BTC PUZZLE ~(Approximately $80 Million)

12632 BTC PUZZLE ~(Approximately $80 Million)

12632.37162517 BTC hidden in this picture below:
12632.37162517 BTC hidden in 1CoV19
Figure it out, find the key to the Bitcoin, and claim the prize.
Whoever cracks the code can do whatever he/she wants (including donating to charity).
While solving the puzzle you can find private keys to 5 more BTC addresses with huge value.
Congrats to the genius who figures it out.
View the address:16eht5osxarvsX9rFBuNgey18N3TFxeE1P
HINTS:
Address: 1CoV19Nw1731inbx38t3Y2mcdnCehA9FmJ
12 Words 1CoV19.jpeg
A=16eht5osxarvsX9rFBuNgey18N3TFxeE1P
B=1CoV19Nw1731inbx38t3Y2mcdnCehA9FmJ
Private Key A= SHA256(passphrase) 1CoV19.jpeg + B
Mnemonic Code Converter
Sha256 — Reverse lookup, unhash and decrypt

Example:
This private key: KyTxSACvHPPDWnuE9cVi86kDgs59UFyVwx2Y3LPpAs88TqEdCKvb
The public address is:13JNB8GtymAPaqAoxRZrN2EgmzZLCkbPsh
The raw bytes for the private key:4300d94bef2ee84bd9d0781398fd96daf98e419e403adc41957fb679dfa1facd
These bytes are actually sha256 of this public address! 1LGUyTbp7nbqp8NQy2tkc3QEjy7CWwdAJj
....more Examples:
1HwxL1vutUc42ikh3RBnM4v2dVRHPTrTve from Sha256(1FfmbHfnpaZjKFvyi1okTjJJusN455paPH)
1FNF3xfTE53LVLQMvH6qteVqrNzwn2g2H8 from Sha256(1H21ndKEuMqZbeMMCqrYArCdV8WeicGehB
13FzEhD3WpX682G7b446NFZV6TXHH7BaQv Sha256(1E1rSGgugyNYF3TTr12pedv4UHoWxv5CeD)
1LVRWmpfKKcRZcKvi5ZGWGx5wU1HCNEdZZ Sha256(1CVPe9A5xFoQBEYhFP46nRrzf9wCS4KLFm)
1HhNZhMm4YFPSFvUXE6wLYPx63BF7MRJCJ Sha256(145Sph2eiNGp5WVAkdJKg9Z2PMhTGSS9iT)
1G6qfGz7eVDBGDJEy6Jw6Gkg8zaoWku8W5 Sha256(18EF7uwoJnKx7YAg72DUv4Xqbyd4a32P9f)
1MNhKuKbpPjELGJA5BRrJ4qw8RajGESLz6 Sha256(15WLziyvhPu1qVKkQ62ooEnCEu8vpyuTR5)
18XAotZvJNoaDKY7dkfNHuTrAzguazetHE Sha256(15SP99eiBZ43SMuzzCc9AaccuTxF5AQaat)
1HamTvNJfggDioTbPgnC2ujQpCj4BEJqu Sha256(14nuZCWe76kWigUKAjFxyJLFHQyLTsKXYk)
17iqGkzW5Y7miJjd5B2gP5Eztx8kcCDwRM Sha256(1MB3L1eTnHo1nQSN7Lmgepb7iipWqFjhYX)
15M7QfReFDY2SZssyBALDQTFVV1VDdVBLA Sha256(16bjY7SynPYKrTQULjHy8on3WENxCmK4ix)
1LgwKwv9kt8BwVvn6bVWj8KcqpP9JSP1Mh Sha256(1Q81rAHbNebKiNH7HD9Mh2xtH6jgzbAxoF)


Address: 1CoV19Nw1731inbx38t3Y2mcdnCehA9FmJ
will be the next Puzzle if the community decides to raise its value.
Its private key hints will revealed here to solve.
Good Luck .....
submitted by CovidBTC to Bitcoin [link] [comments]

Sign Into Websites Using Your Crypto Wallet Instead of a Password

good news, everybody!
This is my first post on Reddit and it's in fact a repost from another blogging platform where I activate already.
I was excited since I saw this announcement and I thought to myself what kind of approach should have for this kind of story, but the time passed and nothing brilliant came in my mind and then I figured that the simple things are the best.
So: what are you saying about not being necessary anymore to use or remember a password for logging into different services from websites?
Just remember you have to make online payments, log into your streaming providers, games, utility services, etc. Instead of filling every time a password, you will be able to receive a QR code which will allow to make the login possible.
Look what the Marty Bent podcaster said:
“No more remembering unique passwords for separate sites. No more creating unique email addresses for different services. No more having to worry about the site you are interacting with having your data stolen from them. Pure, self-sovereign control of your accounts across the Internet. No usernames, passwords, or identifying information other than the public key that is derived upon sign up.”
There are more solutions that I discovered:
  1. LNURL protocol
  2. MyDigiPassword - from digibyte development
  3. SQRL
  4. WebAuthn
  5. BitID
If the firts two seems to be more reliable, the last three has some flaws, like vulnerability of anti phishing attacks (for SQRL and BitID) or too complex (WebAuthn). The time will demonstrate which is the best.
In two words (rather minutes), this is how it works:
https://youtu.be/XncWhLni-Ok
Let's see what LNURL people says about it:
The basic idea is that each wallet has a seed, which is a random value (you may think of the BIP39 seed words, for example). Usually from that seed different keys are derived, each of these yielding a Bitcoin address, and also from that same seed may come the keys used to generate and manage Lightning channels. What lnurl-auth does is to generate a new key from that seed, and from that a new key for each service (identified by its domain) you try to authenticate with.
So, from the seed of your wallet will be generated different keys for your different websites you access, so nobody will now you are the same person using all of this services.
I hope this material was useful.
If not, please do a comment, it will help me to develop myself in the future
submitted by ovidiuchise to Crypto_General [link] [comments]

Are all possible BIP39 mnemonic seeds produce a valid BIP32 master private key, which produce valid Bitcoin private keys?

The question is provoked by the fact that not all 256-bit numbers are valid private keys. To be valid it must be from 0x1 to 0xFFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFE BAAE DCE6 AF48 A03B BFD2 5E8C D036 4140.
Is it possible that some randomly chosen (with dice, for example) mnemonic seed is not valid, because it produces not valid private keys? Is there a protection for this?
I know that Electrum can be configured to accept a random list of words (user-generated) and to ignore the incorrect checksum.
What is the risk something to go wrong by using manually selected words (selected with dice and "Bip39-diceware" for example)?
Edit: I looked through the documentation (BIP32) briefly and looks like I found the answer:
In case parse256(IL) ≥ n or ki = 0, the resulting key is invalid, and one should proceed with the next value for i. (Note: this has probability lower than 1 in 2127.)
So, it looks like there is a protection envisioned by the developers. Whew.
Edit 2: Actually, no.
In practice, this will never happen (the probability is so small we can ignore it), and likely implementations don't even bother checking the condition.
This is scary.
Edit 3: I tested Electrum. See "I successfully imported invalid Bitcoin private key! #5797" on the Github page.
Edit 4: It's not a bug, it's a feature.
SomberNight said on Github:
Effectively, with what we are doing, some group elements have two representations; while most only have one. Your "invalid" key contains a number that is too large to be a group element; but we subtract the group order from it and use that number instead. It's as if you imported the "valid" key in the first place. In fact if you try to export it, we will give you the "valid" one.
submitted by tedjonesweb 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]

BIP39 24/21/18/15/12-word mnemonic recovery tool if any 1 word is wrong

"Recovery phrase is not valid"? I can help!
Expert Service available (requiring trust)
If you have an invalid BIP39 seed recovery phrase, I can filter by any public address at which you have received Bitcoin or other cryptocurrencies, be it from Ledger, Trezor, Electrum wallet, Bread wallet, Loaf wallet, whatever. Provide me your partial incorrect mnemonic and a public address associated with it, I can narrow this down to the ONE correct mnemonic. (Note that while a public address would help us narrow it down, even if you do not have an address associated with your seed, I can help.) I can help if you have only some of your words, or your whole recovery phrase yet somehow it is not accessing your funds. If on the other hand you have an invalid AEZEED cipher seed for a Bitcoin Lightning Network wallet, or an invalid or corrupt private key, e.g., for a paper wallet, I can also help resolve this issue. I have helped multiple users on reddit and elsewhere recover their crypto. My fee is 10% of any contents up to 10 BTC, and 5% of any contents above 10 BTC. Unlike other services, there is no lower limit to the value of a wallet I will recover, because I love to do this! Please contact u/E-renter or visit https://recover-my-mnemonic.com/

Earn referral fees! I am offering a referral fee of 10% of any earned crypto in case you refer someone for assistance and I solve their issue.

If I have helped to recover your funds, tips optional but highly appreciated :).
Bitcoin (BTC): 3FuR7B7Q1mxg7ZwsUqGcyyfzwTx6DQ48tr
Litecoin (LTC): MPcG1htXZdPrvyRenRKoPg8Lft7jijT4hW
Ethereum (ETH): 0x6CC2Cf7df195d2dfB2CAE80b5B1ED223843AfF5c
Ripple (XRP): rHtfLH3Q6NKjxPd23rDmgYMAGuPFfKnVee
Dash (DASH): Xn28i7BbER2r5omSVUPkrdULLckGuymAdD
submitted by E-renter to litecoin [link] [comments]

How to: Manual BIP39 Last Word Calculation when rolling dice

BIP39 seeds can be generated by rolling dice but the last word must be correct for a valid seed because it partially acts as a checksum.
Finding the last word for 12 word seeds is pretty easy since there are only 16 possible words to try. But for 24 word seeds it increases to 256 possible words. It's easier to calculate it.
I demonstrate here how to do that using a python console without requiring any other program. Obviously this should only be done offline - preferably on a "live boot" system.
  1. Generate 24 words from dice rolls using diceware as usual.
  2. Write down the word index values. Make sure 0-based. Often the word list starts with 1 not 0 - so always subtract 1. You will have a list like this on paper:
    1628,1924,582,1492... etc
  3. On a safe system, open a python console. In Linux terminal just type python. We need to import two modules. Type, import binascii, hashlib.
  4. Start the calculation. We'll use 's' as our seed variable. Start with the first index. s=1628. For each additional word index type, s=s*2048+1924 (use your numbers). You can use the up arrow key and edit the index value so it's actually pretty fast entering them.
  5. When all 24 words have been entered you now can copy/paste this code, which will calculate the checksum, and output the adjusted correct index for the last word.
    s=s/256 h=hashlib.sha256(binascii.unhexlify('%064x' % s)).digest().encode('hex') int(('%064x' % s)[-1] + h[:2], 16) % 2048 
  6. Look this index up in your word list (remember to add one if it is not 0 based). Replace the last word you rolled with this calculated one. It should now validate in any BIP39 wallet. (type quit() to get out of python)
This only takes a few minutes and you can easily see no funny business happens with your seed.
edit - I fixed and formatted better so not off page so much, easier to read.
submitted by jcoinner to Bitcoin [link] [comments]

Groestlcoin September 2019 Development Release/Update!

For a more interactive view of changes, click here
In our current world; bordering on financial chaos, with tariff wars, Brexit and hyperinflation rife, you can count on Groestlcoin to consistently produce innovation that strikes to take the power away from the few and into the many, even after a full five and a half years of solid development.
Here is what the team has already announced in the last 3 months since the last development update:

What's Being Released Today?

Groestl Nodes

What am I?

Groestl Nodes aims to map out and compare the status of the Groestlcoin mainnet and testnet networks. Even though these networks share the same protocol, there is currently no way to directly compare these coins in a single location. These statistics are essential to evaluate the relative health of both networks.

Features

Source - Website

Groestlcoin Transaction Tool

What am I?

This is a tool for creating unsigned raw Groestlcoin transactions and also to verify existing transactions by entering in the transaction hex and converting this to a human-readable format to verify that a transaction is correct before it is signed.

Features

SourceDownload

Groestlcoin AGCore

What am I?

AGCore is an Android app designed to make it easier to run a Groestlcoin Core node on always-on Android appliances such as set-top boxes, Android TVs and repurposed tablets/phones. If you are a non-technical user of Groestlcoin and want an Android app that makes it easy to run a Groestlcoin Core node by acting as a wrapper, then AG Core is the right choice for you.

What's Changed?

Source - Download

Groestlcoin Electrum

What's Changed?

Android Electrum-Specific

OSXWindowsWindows StandaloneWindows PortableLinux - Android
Server SourceServer Installer SourceClient SourceIcon SourceLocale Source

Android Wallet – Including Android Wallet Testnet

What am I?

Android Wallet is a BIP-0032 compatible hierarchial deterministic Groestlcoin Wallet, allowing you to send and receive Groestlcoin via QR codes and URI links.

V7.11.1 Changes

Groestlcoin Java Library SourceSource - DownloadTestnet Download

Groestlwallet

What am I?

Groestlwallet is designed to protect you from malware, browser security holes, even physical theft. With AES hardware encryption, app sandboxing, keychain and code signatures, groestlwallet represents a significant security advance over web and desktop wallets, and other mobile platforms.
Simplicity is groestlwallet's core design principle. Because groestlwallet is "deterministic", your balance and entire transaction history can be restored from just your recovery phrase.

iOS 0.7.3 Changes

Android v89 Changes

iOS SourceAndroid Source - Android DownloadiOS Download

Groestlcoinomi Released

What am I?

Groestlcoinomi is a lightweight thin-client Groestlcoin wallet based on a client-server protocol.

Groestlcoinomi v1.1 Desktop Changes

Groestlcoinomi Android v1.6 Changes

Groestlcoin Java Library SourceAndroid Source
Android DownloadWindows DownloadMac OS DownloadLinux Download

Groestlcoin BIP39 Tool

What's Changed?

Source - Download
submitted by Yokomoko_Saleen to groestlcoin [link] [comments]

r/Bitcoin recap - April 2018

Hi Bitcoiners!
I’m back with the sixteenth monthly Bitcoin news recap.
It's easy for news and developments to get drowned out by price talk, so each day I pick out the most popularelevant/interesting stories in Bitcoin and save them. At the end of the month I release them in one batch, to give you a quick (but not necessarily the best) overview of what happened in Bitcoin over the past month. Lots of gems this time around!
You can see recaps of the previous months on Bitcoinsnippets.com
A recap of Bitcoin in April 2018
submitted by SamWouters to Bitcoin [link] [comments]

Is there any "automated" way of testing passwords for a 24+1 word seed?

Last December, in the middle of the 20k bull run, I decided to split the few bitcoins I had into two different wallets; I sent a small fraction to a hot wallet I created, and put the rest into a cold wallet for the future (as savings). I used a 24 word + passphrase approach (BIP39?) for the second wallet; and as you may have guessed, I don't remember the password. When I tried to access it only a few days later, I couldn't. Well, I could, but balance was zero, which means that I had forgotten the password I had used. And no, coins have not been moved, I keep the public address and they're still there. It's just that I can't access them because I'm trying the wrong password, which creates a totally different wallet. At first I panicked, but since 2018 started with a huge drop in value, I just gave up trying to access my lost funds (honestly, entering a bear market made me feel a bit better hehe)...
Anyway, I was just wondering if there is an automated way of trying a bunch of possible passwords faster than doing it manually. At this point, I've assumed I've lost those coins... But just in case.
Note: no, I'm not trying to hack anybody else's wallet. I just want to know if there is any known script or way of testing a huge list of possible passwords to regain access to a lost wallet.
Thanks in advance!
submitted by Eiprol to Bitcoin [link] [comments]

Groestlcoin Christmas Release!

Groestlcoin Dec 2018 Christmas Release Update

As per usual the 3 months has been all hand-on-deck, helping to bring further adoption utilities to Groestlcoin. The markets have been red but as always that doesn't stop the show from going on with regards to the development since the last release update on 24th September. Here's a recap of what has happened so far:

Recap:

What’s New Today?

Groestlcoin on Trezor Model T

As of the latest version of the Trezor Model T firmware, Groestlcoin is now officially supported! The Trezor Model T is the next-generation cryptocurrency hardware wallet, designed to be your universal vault for all of your digital assets. Store and encrypt your coins, passwords and other digital keys with confidence. The Trezor Model T now supports over 500 cryptocurrencies.

Blockbook MainNet & TestNet Block Explorer

Blockbook is an open-source Groestlcoin blockchain explorer with complete REST and websocket APIs that can be used for writing web wallets and other apps that need more advanced blockchain queries than provided by groestlcoind RPC.
Blockbook REST API provides you with a convenient, powerful and simple way to read data from the groestlcoin network and with it, build your own services.

Features:

Blockbook is available via https://blockbook.groestlcoin.org/ Testnet: https://blockbook-test.groestlcoin.org/ Source code: https://github.com/Groestlcoin/blockbook

Edge Wallet

Groestlcoin has been added to the Edge wallet for Android and iOS. Edge wallet is secure, private and intuitive. By including support for ShapeShift, Simplex and Changelly, Edge allows you to seamlessly shift between digital currencies, anywhere with an internet connection.

Features:

Android: https://play.google.com/store/apps/details?id=co.edgesecure.app
iOS: https://itunes.apple.com/us/app/edge-bitcoin-wallet/id1344400091?mt=8
Direct Android: https://edge.app/app

CoinID Wallet

We are excited to announce that Groestlcoin has been added to CoinID! With integrated cold and hot wallet support, and a host of other unique wallet features, CoinID can easily become your go-to wallet for storing Groestlcoin. More details can be found here: https://coinid.org/s/groestlcoin-wallet-overview.pdf

Features

Android: https://play.google.com/store/apps/details?id=org.coinid.wallet.grs
iOS: https://itunes.apple.com/us/app/grs-wallet-for-coinid/id1439638550

Groestlcoin Sentinel - Windows Released

Groestlcoin Sentinel is the easiest and fastest way to track balances of your Groestlcoin addresses.
Features
You can download it using the links below.
Download the Windows Wallet (64 bit) here: https://github.com/Groestlcoin/Groestlcoin-Sentinel-Windows/releases/download/1.0/SentinelSetup_x64.msi
Download the Windows Wallet (32 bit) here: https://github.com/Groestlcoin/Groestlcoin-Sentinel-Windows/releases/download/1.0/SentinelSetup_x86.msi
Source code: https://github.com/Groestlcoin/Groestlcoin-Sentinel-Windows/

Groestlcoin BIP39 Tool 0.3.9 Update

The Groestlcoin BIP39 tool is an open-source web tool for converting BIP39 mnemonic codes to addresses and private keys. This enables the greatest security against third-party wallets potentially disappearing – You’ll still have access to your funds thanks to this tool.
What’s New
Download the Groestlcoin BIP39 tool here: https://github.com/Groestlcoin/bip39/archive/master.zip
Source code: https://github.com/groestlcoin/bip39
Or use hosted version: https://groestlcoin.org/bip39/

Electrum-GRS 3.2.3 Update

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.
What’s New

Electrum + Android Version 3.2.3:

Android: https://play.google.com/store/apps/details?id=org.groestlcoin.electrumgrs
Windows & OSX: https://github.com/Groestlcoin/electrum-grs/releases/
Linux:
sudo apt-get install python3-setuptools python3-pyqt5 python3-pip python3-dev libssl-dev sudo pip3 install groestlcoin_hash sudo pip3 install https://github.com/Groestlcoin/electrum-grs/releases/download/v3.2.3/Electrum-grs-3.2.3.tar.gz electrum-grs
GitHub Source server: https://github.com/Groestlcoin/electrumx-grs
Github Source server installer: https://github.com/Groestlcoin/electrumx-grs-installer
Github Source client: https://github.com/Groestlcoin/electrum-grs

Groestlcoin ivendPay Integration

ivendPay and Groestlcoin cryptocurrency have announced the start of integration.
IT company ivendPay, the developer of a universal multicurrency payment module for automatic and retail trade, intends to integrate Groestlcoin cryptocurrency — one of the oldest and the most reputable Bitcoin forks into the payment system. Groestlcoin is characterized by instant transactions with almost zero commission and is optimal for mass retail trade where micropayments are mostly used.
According to Sergey Danilov, founder and CEO of ivendPay, Groestlcoin will become the 11th cryptocurrency integrated into the payment module. The first working vending machines for the sale of coffee, snacks and souvenirs, equipped with ivendPay modules, served the visitors of the CryptoEvent RIW exhibition at VDNKh in Moscow and accepted Bitcoin, Go Byte, Dash, Bitcoin Cash, Ethereum, Ethereum Classic, Zcash, Bitcoin Gold, Dogecoin and Emercoin. ivendPay terminals are designed and patented to accept payments in electronic money, cryptocurrencies and cash when connecting the corresponding cash terminal. Payment for the purchase takes a few seconds, the choice of the payment currency occurs at the time of placing the order on the screen, the payment is made by QR-code through the cryptocurrency wallet on the smartphone.
The interest in equipping vending machines with ivendPay terminals has already been shown by the companies of Malaysia and Israel, where first test networks would be installed. ivendPay compiles a waiting list for vending networks interested in buying terminals and searches for an investor to launch industrial production. According to Sergey Danilov, the universal payment terminal ivendPay for the vending machine will cost about $500. The founder of ivendPay has welcomed the appearance of Groestlcoin among integrated cryptocurrencies, as it is another step towards the realization of the basic idea of digital money - free and cross-border access to goods and services for everybody.
submitted by Yokomoko_Saleen to groestlcoin [link] [comments]

Is Ian Colman’s BIP39 Mnemonic Code Converter calculating the wrong checksum?

https://iancoleman.github.io/bip39/
I hope I’m wrong here as I’ve already created a fair few wallets with this glorious site.
Stay with me, as I’m breaking this down so you can tear me a new one if I’ve misunderstood something…
All this is being done manually following the BIP39 specs
Let’s start with a set of hex values to get us a 128-bit entropy to start…
9b 19 3b 32 17 eb 5b 6f 0d 18 8a 92 5d 44 1e 93
This gives us the below raw binary value… 10011011000110010011101100110010000101111110101101011011011011110000110100011000100010101001001001011101010001000001111010010011
To get us the 132 bits needed for the 12 word mnemonic, we need to add the 4-bit checksum to the end. This is done by taking the first 4 bits from the SHA256 hash of the raw binary and adding it to the end…
Hash in hex: EECD064AC143BD279FA3D6F5ED4E4FA9E1D67D87D56B1D9CBA40AC5FB620F968 First 4 bits = “E” = 1110
Raw binary + Checksum gives us the 132 bits. This is split into 11-bit chunks, to give us the 12 binary values needed for the words. (remember to minus 1 from the numbered lines here as the list actually starts at 0 (zero).
All seems straight forward, right?
If you put the above hex value into the website, everything above is correct except for the final word. The website assigns a checksum of 1001 to the raw binary/entropy, making the final value 00100111001 (313, cheese).
Has there been an oversight of the website or (and more likely the issue) am I misunderstanding the checksum generation? My method results in an “invalid mnemonic” when I put in my manual mnemonic.
Edit: Formatting.
submitted by FluffyMumbles to Bitcoin [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]

Forkdrop.io Week 6 - A Novice's Guide to Claiming Forks

forkdrop.io and follow us on Twitter https://twitter.com/forkdrop
We are at 65 Bitcoin Forks/Airdrops 13 Altcoin, 12 Historic and 59 exchanges tracked.
This week, we launched our Guides section which features includes a multi-part in-depth guide for using the bitcoin_fork_claimer tool securely and privately on an Ubuntu live-boot system. They include many screenshots to help step through the process at a comfortable pace.
https://forkdrop.io/novices-guide-to-claiming-forked-bitcoin-value.html
Among other things, we take you through setting up a live-boot Linux environment:
https://forkdrop.io/secure-live-boot-ubuntu-for-bitcoin-keys.html
Installing and running the Tor Browser in said environment:
https://forkdrop.io/running-tor-browser-from-ubuntu-live-boot.html
Downloading Ian Coleman's BIP39 tool for running offline and using it:
https://forkdrop.io/running-bip-39-tool-on-secure-offline-ubuntu-system.html https://forkdrop.io/using-ian-colemans-bip-39-tool.html
Covering the basics of u/ymgve's tool for preparing to run it:
https://forkdrop.io/preparing-to-use-bitcoin-fork-claimer-tool.html https://forkdrop.io/finding-parameters-for-bitcoin-fork-claimer-tool.html
Tips on finding exchanges to deposit while keeping your identity as private as you want to be:
https://forkdrop.io/scouting-exchanges-to-sell-forked-bitcoin-value.html
And then actually running the scripts:
https://forkdrop.io/running-bitcoin-fork-claimer-on-ubuntu.html
20 articles in total which will grow in size as we go forward.
There were also some minor feature improvements this week, such as adding the marker icon to the per-coin and per-exchange pages.
Summary of dataset updates:
Stuff we are working on:
  1. More guides/articles & improved presentation of existing articles
  2. Night mode (much requested!)
  3. Better price info
  4. Tell us what you want to see!
Ways to support the site:
  1. Participate in BitcoinAirdrops - we read it all
  2. Submit us your info, corrections, etc.
  3. Follow us on Twitter: https://twitter.com/forkdrop
  4. Participate in the Disqus discussion forms for each coin/exchange
  5. Use the referral links when signing up for exchanges <3 <3 <3
  6. Send donations to donation addresses on the footer of the site
All the Best,
The Forkdrop.io Team
submitted by forkdrop to BitcoinAirdrops [link] [comments]

A guide to sign a super bitcoin (SBTC) transaction offline with patched Electrum for paranoid. Supports any wallets supported by Electrum (including segwit-p2sh and bech32 and all BIP39 seeds). Later BCD will be added.

This is quite advanced. This guide assumes you have some basic experience with the command line, can run Linux and you understand the basics of keys/signing/broadcasting transactions. And that you can compile and run Bitcoin Core and run Electrum. Also, some JSON experience is also nice.
Move you bitcoins to safe addresses first. It is best to use a new seed. Although the procedure in this guide is safe even for hot addresses (containing bitcoins), there is always a risk of a critical mistake. So play it safe.
Why such a guide? I followed these steps because I did not want to expose the keys to any online machine at all. Even if the keys do not have any bitcoins, you can some day have bitcoins sent to these addresses or you have a fork that you have not claimed. All can be stolen if you exposed your key.
This procedure should work with everything that Electrum supports (except maybe F2A that may be not supported on the SBTC chain), so Electrum seed legacy or segwit, LedgeTrezor with legacy or segiwt-p2sh (m/'49) derivation. Similarly, any BIP39 seeds or a single key. are also fine.
  1. Download Electrum. git clone https://github.com/spesmilo/electrum
  2. Apply my patch patch -P0 also this article. The guide assumes that you use patched Electrum from now on.
  3. Run the patched Electrum and catch up with your wallets you want to claim (the wallets can and rather should be watch only, or on ledgetrezor, otherwise your keys are exposed). Now go offline or set localhost as your server that Electrum connects to so no connection is performed. It's required so Electrum will not update the wallet after you edit it.
  4. You can manually create a transaction from the command line but you can use Electrum GUI. You need to locate the wallet file and remove all the transactions from the wallet file except for the one that funds the address you want to claim (the wallet obviously must not be encrypted but for watch-only this is OK). This is tricky. You need to make sure, you gave a proper JSON file, so all the final commas must be dropped. So "addr_history":, "transactions": , "tx_fees":, "txi", "txo", and "verified_tx3": should only contain the funding transaction(s), i.e. the one that you want to spend from.
  5. Run Electrum and check if the wallet is OK. Electrum will show an error if not. You will probably make a few errors so go back to editing the wallet.
  6. Download SBTC bitcoin core clone. git clone https://github.com/superbitcoin/SuperBitcoin
  7. Compile it and let it sync the blockchain (it will take a long time). Run it it with as large -dbcache= as you can. If you have a Bitcoin blockchain you can copy the blocks up to the fork date and issue sbtcd with -reindex. It will just reindex them and it will be faster.
  8. Generate a sbtc address with sbtc-cli getnewaddress. You can skip this step and send directly to an exchange but this intermediate step is safer.
  9. Create a transaction in Electrum to this address. Select all the bitcoins and use as small fee as possible (SBTC blocks are empty so any fee above 1 SBTCsat/byte should be OK).
  10. Save the transaction to a pendrive
  11. Download and install Kubuntu 16.04 (Kubuntu has all the QT libraries for Electrum) on a pen drive.
  12. Copy patched Electrum and the save the transaction to a pen drive (separate from Kubuntu will be more convenient).
  13. Run Kubuntu from the USB without any network access. Run Electrum from the pendrive. Create a wallet from the seed or private keys. The wallets are stored in RAM so after you reboot the computer, they will be gone. Load the transaction, sign it and save it to the pen drive.
  14. Go back to the SBTC Core on the online machine. Display the raw transaction (starts with the hex=). Check in the SBTC Core if it is correct sbtc-cli decoderawtransaction hex
  15. If it looks fine (and your blockchain got synced), broadcast it sbtc-cli sendrawtransaction hex
If there is no error, congratulations, you sent the transaction to the specified address. If it is to your SBTC Core wallet, wait until it confirms and send it further with sbtc-cli setfee feeperkb sbtc-cli sendtoaddress "addr" value "" "" true true
I'm going to update this guide when I figure out the BCD transactions intrinsics. You can download and run the BitcoinDiamond Core clone in the meantime.
SBTC tips: 1KjuY8CTrwMhdLt3uF3hCcSgfkHMyo1ELf
submitted by PVmining to BitcoinAirdrops [link] [comments]

xvultx4llltx7w2d.onion is 18 months online today

TLDR; The site that has been running nice and quietly on TOR for 18 months. We thought today is a good day to make the url public outside of our group of amigos.
PGP: 3DB6 FF02 6EBA 6AFF 63AF 2B6E DCE5 3FA2 EC58 63D8 Bitcoin: 18FNZPvYeWUNLmnS6bQyJSVXYPJ87cssMM TOR: http://xvultx4llltx7w2d.onion

Vultronix encrypted social network.

Abstract: Since time began, social interaction has always been private to those within the same vicinity. Today, however, much data is sent encrypted to a third party, gets decrypted on arrival and then stored among mountains of un-encrypted data, stored for financial gain creating giant honeypots. These giant honeypots of un-encrypted data are just too irresistible to those who have the power to request access.
We propose a solution to these centralized honeypots by enforcing client side encryption in such a way that the server has no access to the encrypted content, we believe this can be achieved via a mix of key hashing, PGP, AES and Onion routing. We acknowledge the current JavaScript anonymity problem and see a future where secure hardware will encrypt/decrypt the data for the user. We propose the below as a simple POC for inspiration of future development, open for all to copy, enhance and most importantly, to scrutinize.
1. What is the example? A truly client side TOR based encrypted centralized social network. Allowing users to interact anonymously online without the ability of the host to spy on the user. Trust with the host is established via signed open source Javascript. Everything is delivered directly from the host via TOR without any use of CDNs.
2. Centralized over decentralized? The greatest problem available to implementing encryption to the masses is user experience. We developed Vultronix to allow the user to interact with others securely via a familiar feeling platform. More experienced users can download the code and setup their own .onion domain, further removing the risk of a centralized authority.
3. Registration The user is required to fill in 3 fields. For familiarity we've named them the following - Email address, Password and Words list. The user is not required to enter their actual email but is encouraged to generate a string with a lot of entropy; it is acknowledged that the less experienced user will probably make up an email address, both the password and words field should be as random as possible. The entropy of these 3 fields is on what the user's encryption depends.
Note: as the system is not decentralized, the logins are only available to brute force attack by the host or if/when the database is compromised and dumped online. To achieve the best security a password tool should be used with 3 very random strings. A more user friendly solution is to make up a very random but easy to remember email address via a random mnemonic seed generator similar to BIP39, a difficult password the user can remember and a short word list.
Given a user selects the following log in details which, let's assume, were created by a BIP39 generator. + email: [email protected] + password: liquid sketch husband + Word list: shove proof dismiss gauge
The above contains 12 completely random words.
The browser will concatenate these to [email protected] sketch husbandshove proof dismiss gauge This value would then be hashed, creating the following hash. 90bc6ba57145e2116ea10d136ec49061e9a15c5694b171ba1e5753ab02e141e4
This hash is hashed forward 5001 times, on the 2000th hash the sha-256 becomes a sha-512 hash in the following fashion. SHA512(2000th hash + 2000th hash) and is stored momentarily as the "loginHash" variable. The loop continues on with all further loops taking a different path that can't be reached by hashing forward the login hash. The 3000th hash is saved as the "passphrase" variable The 4000th hash is saved as the "encryptionKey" variable and the 5001st hash ends up being Hashed again for good measure. loginHash = SHA512(loginHash + 5001st hash);
At the same time during registration the user's browser will generate a 4096 PGP key pair. The PGP password is the "passphrase" variable. Both the passphrase and the encryptionKey never reach the server. The PGP pub/priv keys are both AES encrypted with the encryptionKey as the password and sent to the server.
Note: The PGP public key is never sent to the server unencrypted as we don't want someone with access to the Database to be able to analyze who is friends with who.
Also generated at sign up is a UUID, this is AES encrypted as well.
Sent to the server on sign up is the following. + encrypted: PGP public key - AES encrypted string. + encrypted: PGP private key - AES encrypted string. + encrypted: UUID - AES encrypted string + loginHash: SHA-512 hash.
Upon signing in, the user fills out his profile. This data (including any images uploaded) is encrypted client side by the user, the user encrypts a copy to himself using his own PGP public key, which is currently decrypted in his browser session, then encrypts this again with his AES encryption key.
4. Login A user will login with the same credentials used at sign up, the loginHash will reach the server and the server will find a match and send back the user's encrypted credentials. The user's client will decrypt these with his "passphrase" and "encryptionKey", neither of which have ever been sent to the server.
Note: If a MITM intercepts a user loginHash over the wire, the MITM will be able to retrieve the encrypted data from the server, but will never be able to decrypt it, and won't have any further access to the user's data.
Once the user decrypts his credentials data, he'll have access to his UUID, the client will then request from the server an encrypted friends list object, the client will decrypt this and populate client side his friends list. This will contain the public PGP key of each of his friends along with a friendship key unique to each friendship as well as a generated shared password unique to each friendship. The client will also send requests to the server to look for feed updates, inbox messages, new friend requests and accepted friend requests etc.
5. Friend requests To keep friendships private, a user must send another user a friend request token. Since everything in the Database is encrypted , it isn't possible for a user to simply look up a friend. Via the friend request page the user will fill out a short message and press a button. The user is presented with a SHA-256 hash that will expire after 2 weeks. The user simply needs to pass this hash onto his friend via other means of contact, the friend then enters the hash into the friend request page, the friend will then see a thumbnail of the user (or whatever logo the user has chosen for his profile picture) followed by the short message the receiving friend should recognise, e.g. "Hey Alice it's Bob, please accept my friend request", Alice accepts the friend request and they're now friends, Alice won't have access to Bob's profile page until Bob next logs in.
Behind the scenes, the following happens: Bob's message is concatenated to a generated UUID This string is hashed many times like the loginHash An object is created containing Bob's following encrypted data: + PGP Pub Key + friendshipUUID unique to this friendship + sendersFriendshipUUID + acceptersFriendshipUUID + Bob's Name + Bob's thumbnail (all images are converted to base64 strings in the browser then encrypted/decrypted client side) + Request message etc.
This encrypted data is sent to the server, the friendship token is equivalent to the final login hash that a user generates on login. Bob doesn't, however, send Alice this final hashed token, he sends her an earlier version of a hash. Alice will enter this hash, her browser will roll it forward creating the decryption key and eventually the friendship token that resides on the server, her client will send this to the server, the server will respond with the encrypted data. Only she can decrypt the data as only she has the earlier hash of the friend request token.
She decrypts Bob's friendship data, adds it to her FriendsList data, encrypts the latest copy and sends it through to the server for safe keeping. Alice's client will now create an encrypted accepted friendrequest object submitting it to the server. Alice will then use Bob's PGP key and their new friendship password they share to double encrypt her profile to Bob.
When Bob logs in next (or if currently online via web sockets) he will receive the accepted friendrequest token. Bob's client will then do what Alice's did and update his friends list etc and send a copy of his profile through to Alice. Bob and Alice will now see each other's new status updates, album updates etc.
Note: A new friend can never see old status updates, this should be considered a feature.
6. Chat and instant messages Users can see when other users are online and chat via web sockets, they can also send offline messages via their inbox. These messages are double encrypted. If Bob sends Alice a message, the following happens: Bob's client will encrypt the message using Alice's PGP public key and a copy using his own PGP public key, he'll then encrypt both using their shared friendship password and place 2 entries into the database. If Alice is online the server will push up her messages instantly via web sockets, if not, she'll see the message the next time she logs in, she'll notice this as the inbox icon will be red to signify unread messages.
Note: If a user has Vultronix open in another tab, he'll hear a sound when a new message is received as well as a keyboard sound when his friend is typing.
7. Group invites Groups allow shared users to associate online in private without having any access to who other members of the group are, users can also send private encrypted messages to other users of a group in full privacy. Anyone can create a group. On group creation the group's admin client will generate a random password, the admin can give the group a logo and message etc. The admin can then create a group invite token and the recipient of the token can sign up to the group in the same way that a user would accept/decline a friendship request. Once a user is a member of a group, he too can invite friends. All of these people will share an AES encryption key which they'll get via decryption of the encrypted invite request. Each user will be able to download a shared membership list of the group, which will not be able to identify any users. This list will contain user PGP keys that are used when a member sends another member of the group a private 1 - 1 message.
TLDR; Everyone in the group can start threads, comment in threads, invite new friends etc, no one outside of the group will even know of the group's existence, the group's description, name, members list etc. All of it is encrypted and private. No member will know that other members have privately messaged each other. No member will be able to find another member's profile. However, if they wish to be friends, they can private message a friendship request token. Members can have their own groups and private message friend request tokens through to members to join other private groups.
8. Status updates When a user creates a new status message, the user's friends will see the message appear in their feed either in real time if they're online, or the next time they login. When a user fills in the status box, the user can optionally add a photo or youtube video link (caution: external services could be used to track you) and then press save. After the user saves the status the following happens:
The status is encrypted and saved to the server. To reduce client computation time as well as server storage, only one copy of the status is saved to the server. The client will encrypt and upload a new encrypted message for each of his friends, this message will simply hold a AES decryption key and a status ID, the friend's client will then request this status and decrypt it. All of the user's friends can comment on the status, only the user will be able to click through to their profiles. It's impossible for user's friends to be able to interact with each other outside of their shared friend's status comment box.
9. Shops Private encrypted shops would be easily implemented via the following: The shop owner would setup shops in a similar way to setting up a group, inviting customers to his private shop with tokens. He could send these tokens to his friends in his friends list or new people he meets in a private members group via private message. This would allow the shop owner to sell to only people he trusts, e.g. his grandmother or aunt etc. The shop owner would have complete privacy. The shop owner would keep control of all his bitcoin private keys. He would enter a list of bitcoin addresses, then add items to his shop. Upon adding an item, the client would submit an encrypted copy of the item to the server for each customer of his store. Customers would browse his store and see an item, the item would have a bitcoin address to pay to. The customer would enter a message, be it his email address for a digital order or a postal address for a physical order. He would then pay to the bitcoin address and hit submit. The shop owner would see a page with orders and see the email address and manually check the bitcoin address has funds.
This would allow sellers and buyers online to have great protection, providing they're buying/selling from people they trust. If the server is hacked and database stolen, no one will have access to any bitcoin as no private keys would ever be on the server and everything is encrypted, so no one would know what shops even exist, unless they have a personal invite to that store.
This kind of private store could be very useful for people living under oppressive regimes. If, for example, someone wants to learn about Capitalism and would like to buy Capitalist literature but they live in a censored Communist state, they could access via TOR and order anonymously without ever having to worry about the site being hacked and their government going through the data and heavily punishing them, possibly with death. They would be at risk though of the literature being confiscated in the mail so they'd be better off to order a digital copy and have it emailed or, perhaps, the seller could simply copy and paste the text into a private message to the seller.
The possibilities would be endless for the above, we have not implemented this though as we're not sure of the legality. If someone decided to sell something illegal and law enforcement wanted information on the buyeseller, we would never be able to retrieve it from the database. If, however, they managed to become a member of a store, they could perhaps tell us a UUID that might represent the store and we could delete the shop at their request, but not much else. For this reason we're not going down this path, it is however fascinating to think of.
We'd predict that OpenBazaar would one day offer the ability of hidden stores, not just the ability to route via TOR. For any OB users we've added a OpenBazaar field to the member profile info page.
The goal of this project is to show that client side end to end encryption is possible for intermediate users and not that difficult to implement. We hope this inspires people to build something similar and better or, perhaps, fork the code and fix some bugs etc.
We appreciate your time, if you enjoyed this or atleast appreciate our effort, our bitcoin address is below. Bitcoin: 18FNZPvYeWUNLmnS6bQyJSVXYPJ87cssMM
PS: The code will be uploaded to a public Github profile this week.
http://xvultx4llltx7w2d.onion Latest version: Content hash: 1aa450c4a4bef1ddee92d6572f81aa14baad959402563064f0ff81e6f42b69d9 lib.js hash: 8704461878818f5f00f18c61789e03c1b90bfc07bc21a15301ce876e7f71829c
submitted by Vultronix to onions [link] [comments]

COBO Tablet for Backing up Mnemonic Seed Phrases for Bitcoin Wallets BIP39 Passphrase Recovery (Or Hidden Wallet Password, 25th word) For Ledger, Trezor, Keepkey, etc How to crack Bitcoin accounts, MUCH MONEY CAN BE MADE How To Get UNLIMITED Bitcoin for FREE in 2020! Extract Private Keys from Trust Wallet - works for Bitcoin, Ethereum, Litecoin and other cryptos

Bitcoin is a distributed, worldwide, decentralized digital money. Bitcoins are issued and managed without any central authority whatsoever: there is no government, company, or bank in charge of Bitcoin. You might be interested in Bitcoin if you like cryptography, distributed peer-to-peer systems, or economics. A large percentage of Bitcoin enthusiasts are libertarians, though people of all ... Bip39, Bitcoin Secret test . Transaktionen werden nach dem spätesten Zeitpunkt sortiert und ein Limit von 200 tx wird zurückgegeben. Die Währung, in der die Gelder abgehoben werden sollen (möglicherweise mit Umtauschgebühren verbunden). Wie in BIP 44 definiert, scannt die Wallet-Software nicht mehr als 20 nicht verwendete Adressen. Mithilfe dieser Funktionalität können Sie Parameter in ... Pick the one you want, and press OK. There are no more steps; the new value is in effect. Using Coldcard with a BIP39 Passphrase. All features operate the same as normal after the passphrase is used. Your passphrase is not validated in any way. If you enter an incorrect phrase, you will not find your Bitcoin! Expect zero balances in that case. BIP39 and its flaws. BIP39 is the most common standard used for seed phrases. One notable example is Electrum wallet, which is using its own standard, and for good reasons.BIP39 has some flaws, known in the technical community but not known much wider. They are described here on this electrum doc page.Most seriously, BIP39 flaws mean it is not true to say that backing up a BIP39 seed phrase ... How To Use Ian Coleman's BIP39 Tool For Finding Bitcoin Addresses And Private Keys From A Seed Phrase. Introduction . In this guide, we are going to use a specialized tool for examining a seed phrase that likely came from a hardware wallet or wallet software. From the seed phrase, this tool can reveal individual bitcoin addresses and private keys in their raw form. The raw form can then be ...

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COBO Tablet for Backing up Mnemonic Seed Phrases for Bitcoin Wallets

This is a short script I wrote that generates BIP39-compatible Bitcoin wallets. It runs on an ESP8266 and is only a few lines, so you can generate your own B... If you are new to Crypto, my suggestion is that you start with buying ~$150 worth of Bitcoin, Ethereum, Litecoin @ Coinbase and get familiar with storing it, moving it around, etc. This wallet is BIP39 compatible, so can be used to generate the seed phrase that can be used with a Trezor, Ledger or Keepkey. (You can store your crypto on it even before you have purchased one ... Ian Coleman Mnemonic Code Converter for cryptocurrencies like bitcoin, litecoin, etheruem and so on https://iancoleman.io/bip39/ Monero recovery tool https:/... If you are new to Crypto, my suggestion is that you start with buying ~$150 worth of Bitcoin, Ethereum, Litecoin @ Coinbase and get familiar with storing it, moving it around, etc.

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