Electrum. Kryptowährungs Wallet - BitcoinWiki

Electrum - Simply the best thin Bitcoin client

The best, cutting edge thin Bitcoin wallet.

Does Chrome's Ledger wallet application use a remote server (like electrum) of the Ledger company, or is the Chrome wallet app an independent thin client that connects directly to the Bitcoin network and does not rely on Ledger company's servers?

submitted by Amichateur to Bitcoin [link] [comments]

Does Chrome's Ledger wallet application use a remote server (like electrum) of the Ledger company, or is the Chrome wallet app an independent thin client that connects directly to the Bitcoin network and does not rely on Ledger company's servers? /r/Bitcoin

Does Chrome's Ledger wallet application use a remote server (like electrum) of the Ledger company, or is the Chrome wallet app an independent thin client that connects directly to the Bitcoin network and does not rely on Ledger company's servers? /Bitcoin submitted by BitcoinAllBot to BitcoinAll [link] [comments]

Was using bitcoin-qt on OSX, blockchain got corrupted and now it is impossibly big to re-download, what thin clients can I import my wallet.dat into?? OSX 10.7.5. I already tried electrum and looks like I'd have to build it from github, can't figure it out. please help.

Send help! is there a safe way I could download a torrent of the blockchain? i tried to reindex the blockchain (after my harddrive got unplugged while bitcoin-qt was running) and it looks like it would literally take a week of spinning my poor laptop fan balls out.
edit: wallet.dat is encrypted and safely backed up.
submitted by sporabolic to Bitcoin [link] [comments]

ELI5 what the Electrum servers (eg ElectrumX) are for. What is their role?

My understanding is that Electrum is a thin-client wallet, as opposed to a full Bitcoin node. As such, it relies on other people's full Bitcoin nodes for access to the Bitcoin ledger.
Is that what Electrum servers are? Just Electrum's own implementation of a full Bitcoin node? If so, can the thin-client connect to anyone's implementation of a full Bitcoin node? Or can the thin-client only connect to Electrum servers?
Alternatively, are Electrum servers some sort of extra layer between the thin-client and the full Bitcoin nodes? If so, why is this needed?
submitted by paroariax to Electrum [link] [comments]

Groestlcoin 6th Anniversary Release


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

UPDATED - Groestlcoin Core 2.18.2

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

How to Upgrade?

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

Other Linux



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


ALL NEW - Groestlcoin Moonshine iOS/Android Wallet

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





ALL NEW! – HODL GRS Android Wallet

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



Main Release (Main Net)
Testnet Release


ALL NEW! – GroestlcoinSeed Savior

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


Live Version (Not Recommended)





ALL NEW! – Vanity Search Vanity Address Generator

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






ALL NEW! – Groestlcoin EasyVanity 2020

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




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

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


Remastered Improvements



ALL NEW! – BIP39 Key Tool

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



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


ALL NEW! – Electrum Personal Server

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



Linux / OSX (Instructions)


UPDATED – Android Wallet 7.38.1 - Main Net + Test Net

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



Main Net
Main Net (FDroid)
Test Net


UPDATED – Groestlcoin Sentinel 3.5.06 (Android)

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




UPDATED – P2Pool Test Net



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


submitted by Yokomoko_Saleen to groestlcoin [link] [comments]

I'm tired of bitcoin-qt

Mini rant. I was happy using bitcoin-qt for quite a few months now, It had gave me a few headaches, sometimes the database was corrupted or something, just re-index it. It worked fine.
I always exit bitcoin-qt before shutting down the computer, to never let this happen again, but it happens from time to time.
Anyway, five days ago, it started again with the database problem. I tried to reindex it, delete last blocks and reindex it, nothing was working. So, OK, screw it, delete all (except wallet file) and let download the whole blockchain again. ... Well... it stopped syncing after a while. It tells me that I need to update the client. Other times I it tells me it's syncing, but it shows a 0 blocks indexed (and no arrows icon on bottom-right).
After 5 days, I just delete everything (again) and started from 0.
I don't like the idea of thin client, but for the moment I've downloaded MultiBit, I read that Armory works on top of bitcoin-qt, should I try it or I will have the same problems?
I know this is my problem, not a problem with bitcoin-qt itself, it worked very good for months. I don't think it's a network problem (I have a good connection), not a software problem (Debian Squeeze), as I said, I exit the program before the computer. Just a mini-rant about all this.
I'm also concerned this happens to less techie people, they could easily delete the wallet file, or just get tired of bitcoins because of similar problems with the programs.
submitted by still_unregistered to Bitcoin [link] [comments]

CashShuffle Roadmap

CashShuffle is about to go into the next phase of maturity in next 1-2 months and finally become a real fungibility solution for Bitcoin Cash.

We had been working on solving the liquidity problem with a liquidity 'bot' that can provide shuffles if not enough participants are online. The next logical step was to make this function available from the wallet itself rather than a seperate program. Others have been suggesting we create some kind of incentivization program (similar to join market).

But now there are a few big things coming together to make Cash Shuffle adoption a reality.
The first thing is a breakthrough from u/zquestz that seems to be a superior solution to anything proposed so far. The idea is to have wallets pre-shuffle their UTXOs. This can happen in the background and when you need to make a payment, your coins will already have been shuffled.

The second thing is merging Cash Shuffle into wallets. u/jonald_fyookball had expressed a willingness to merge this into the main Electron Cash wallet, if Cash Shuffle can pass an independent security audit (which we plan to do). We will implement this solution first on Electron Cash as a reference implementation, but we have also received inquiries from several other wallet teams.

With this new scheme, the wallet's UTXOs can be shuffled in the background automatically. There should be plenty of liquidity because a) it will be widely avaiable to many users, b) it can happen in the background, NOT while someone is waiting for a payment, and c) everyone will naturally be incentivized to participate to enjoy the privacy features.

There will still be a client server model and the client can indicate a group of active servers. Each time a shuffle is to be made, the client will randomly select one of the active servers. By having multiple servers, the solution will be distributed and censorship resistant.

In the slightly longer term, we plan to improve things on the server side by encrypting and blinding the messages to the server so that even the servers won't even know they are participating in cash shuffle, and this can be made part of the electrumX servers or any other relay. There can also be some kind of shared mempool of joins so that more servers can join without spreading the joining market too thinly.

Thanks to the community support from the Cash Shuffle team!

The more development resources we can put on this, the faster it can happen :) If you would like to donate to this effort, all contributions are highly welcome and appreciated.

submitted by ClifordSymack to btc [link] [comments]

I have tried to understand, but could someone explain how Thin Clients work? How do I get my coins if the server they use goes away?

Hey all. I started using bitcoin years ago. Stopped paying attention for a few years and now there are all these thin clients that people seem to recommend. I am unsure how they work.
Say I have some coins in Mycelium or Electrum or any other of these thin clients. Lets say something happens and the servers they use completely go away. How do I recover my coins? Is that possible? Do I not understand something?
Is there a tutorial somewhere that I can get at my bitcoins from one of these thin clients without EVER connecting to their servers? Like somehow get the wallet file out of them and slap it into a full client which does verify the whole chain and get my coins that way? I would like to do that myself before using/trusting one of these thin clients.
submitted by f4hy 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.


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.



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


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]

A little late for Moronic Monday: Is there any real benefit to using a thin Bitcoin wallet as opposed to using the default fat one?

I downloaded Electrum to a friend's computer, gave her some bitcoin for her birthday. I was very pleased with the simplicity of it and no day-long blockchain download. Currently I have the official bitcoin-qt wallet for windows.
Thanks for any help!
submitted by QNinja to Bitcoin [link] [comments]

Groestlcoin June Development Update & Release!

Another Quarter, Another Release! The Groestlcoin production factory has been working overtime as always in order to deliver even more tech to push Groestlcoin mainstream when the time comes.
There have been many new fantastic wallets and exchanges added to Groestlcoins repertoire over the past 3 months so we will re-cap these before moving on to what is new today.


What's New

Re-forged: Groestlcoin Samourai

Groestlcoin Samourai is a wallet for the streets. A modern Groestlcoin wallet hand-forged to keep your transactions private, your identity masked, and your funds secure. Its main advantages are its extreme portability and is the most secure Groestlcoin mobile HD wallet.
We've built a wallet that Groestlcoin deserves. If you are looking for a wallet that Silicon Valley will never build, the regulators will never allow, and the VC's will never invest in, this is the perfect wallet for you.
![Groestlcoin Samourai Release Video](http://img.youtube.com/vi/i3WU8Tde8XQ/0.jpg)

Head over to the Groestlcoin Samourai Release Page here for the full release announcement.

New: GroestlImage

Groestlimage turns any file into a mnemonic phrase allowing users to generate Groestlcoin private keys and addresses based on the data URI of the provided file. A picture is worth a thousand Groestls.




Source Code


New: Groestlcoin Core Config Generator

Groestlcoin Core Config Generator is a simple GUI to configure the groestlcoin.conf file – A developers dream tool!
Each configuration option is available via the user interface, grouped by what attributes they affect. For ease of getting started with a new configuration, a variety of preset "node classes" are available on the right-hand-side of the screen. Selecting a preset will load our recommended base configuration for a node fitting that description, at which point you can then tune the configuration at the single option level.




Source Code


New: Groestlcoin Dumb Block Explorer

Dumb Block Explorer is a trivial block explorer written in a single PHP file. Now everybody can run their own block explorer.




Source Code


New: Groestlcoin SMS Push TX

Groestlcoin Simple Push TX is a server to push Groestlcoin transactions via SMS. Now everybody can send new transactions via SMS if the Internet is not usable (i.e. blocked by government entities or becomes otherwise unavailable).


Source Code


Update: Electrum-GRS 3.3.6

Electrum-GRS is Groestlcoins #1 thin-client for Windows, MacOS, Linux and Android, based on a client-server protocol. Supporting multi-sig wallets without the bloat of downloading the entire blockchain.

New Features (Universal)

New Features (Windows, MacOS, Linux)

New Features (Android)



Source Code

submitted by Yokomoko_Saleen to groestlcoin [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:


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.


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.


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


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.
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/
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]

With all of the hullabaloo about a thin Dogecoin wallet, specifically naming Electrum, I went and analyzed both Electrum and the official P2P protocol's own thin-client support. I think I might have found a really big problem with them.

…and the thing that’s really got my jimmies rustled is how obvious the problem appears on the surface, and how I can’t find anyone else talking about it. So if you all don’t mind, I’ll go ahead and describe what I think could be the achilles heel of contemporary crypto currency thin clients. I'll be making some really strong assertions, but if anyone has any information that contradicts them, please share!
EDIT: By request from jdk, an abstract of sorts:
Light cryptocurrency wallets take absence of evidence as evidence of absence. Since they cannot verify that the nodes they are talking to have told them the full truth, it's possible that they will miss some incoming transactions.
I describe three attacks:
1. The simplest one don't tell the client about certain transactions. Because bitcoinj ignores block headers it has already seen, this attack is super effective! against it. Electrum, too, so long as all the nodes it's connected to all agree to not tell it. Once someone does tell it about a past transaction, it verifies it, and then adds it to your wallet. Unfortunately, this can be used to facilitate the third attack.
2. (This only applies to Electrum) A slightly more complicated attack has the attack nodes refuse to acknowledge a single outgoing transaction. Because Electrum always uses the oldest transactions to create new transactions, and because it takes absence of evidence as evidence of absence, you can freeze a user's wallet for as long as they are connected to you, or if they don't inspect older blocks. But, again, inspecting older blocks opens you up to the third attack.
3. A merchant and an attacker can conspire against you to trick you into sending your coins twice. They do this by running the second attack, then back-feeding older transactions so your client will attempt to spend those first. This will work as long as you, the user, try to re-initiate the transaction that supposedly failed.
If you haven’t already read the Bitcoin White Paper, I suggest you go ahead and read it, specifically Section 8 on Simplified Payment Verification. I found it to be fairly straightforward, and it should give you enough background to understand what’s going on. I'm also discussing Electrum and bitcoinj, the latter being a specific example of a client which, by default, relies on Simplified Payment Verification, henceforth known as SPV.
When people speak of "thin" clients, they are referring to clients that do not download all of the transactions in a block along with the block headers. Instead, they only download some of them. Because a block containing transactions links to its transactions by way of a Merkle tree, it is possible to omit a majority of transactions, yet still verify that the ones given were indeed present in the block. It is this property of Merkle trees that allows SPV to be possible.
Electrum came about just when the Bitcoin blockchain became too large for most people to stomach, a lot like what is happening with the Dogecoin blockchain now. The mechanics of SPV had been known in the community for as long as the white paper was released publicly, but the core protocol did not directly support it. Electrum was a series of cute, workable hacks that resulted in an SPV client, but also a client-server architecture and a completely different RPC protocol. At the time, it was necessary in order to receive the filtered transaction notifications necessary to efficiently implement SPV. However, the core Bitcoin Peer-to-Peer protocol now supports the capability of notifying peer nodes of what kinds of transactions of which you wish to be notified. The peers will always respond with blockchain headers, and in the event that any interesting transactions appear to be found, the Merkle branches of those transactions. The client then filters out the false positives (in order to efficiently implement this, the protocol uses a data structure called a Bloom Filter to encode the interesting wallets in a compact manner. It is susceptible to false positives, but that's OK, because you can safely ignore them) and verifies that the transactions sent were actually part of the block by rebuilding the Merkle root and comparing it to that of the block.
This is all well and good from an efficiency standpoint, but any sort of *coin being a type of currency, and thus demanding a high standard of security, I hold some gripes about both Electrum in particular and SPV in general that I feel make them unsuitable for the purposes for which they are currently being used.
The Electrum client begins its connection to the Bitcoin network through a series of hard-coded individual servers. There is a mechanism for describing more peers through IRC; the channels for which are provided by the servers contacted at start-up. I fear that this design empowers both the authors of the client and the owners of the seed servers far too much. In collusion, administrators of the seed servers could elect to not run IRC channels at all, or, alternatively, moderate out any servers from non-colluding parties. This could be used to facilitate something disastrous, particularly what I am about to describe.
In general, SPV provides excellent protection from false positives. Any transaction received with a Merkle branch must continue to hash to the proper child value until the Merkle root is reached. If the Merkle root is linked to a trusted block in the blockchain, its existence in the network is proved. But, it is computationally infeasible to protect from false negatives in a SPV scheme. All the peers need to do is refuse to pass on certain transactions. The client will be none the wiser for it, because the client never knew about them in the first place.
This can obviously be used to facilitate an “output garnishing” attack: simply ignore certain transactions outputting to a certain wallet when responding to the client. The client will not be able to see that there are more unspent outputs to its wallets, because he trusts and relies on his peers to do that instead.
"Output garnishing" can be reworked into a "wallet freezing" attack that completely locks the client out of the network. The attacking node may elect to pass an outgoing transaction to the network, but fail to relay the transaction’s status to the client. The client will believe that the transaction was unsuccessful, and because both Electrum and bitcoinjEDIT: bitcoinj marks outgoing transactions as "pending" and won't double-spend them deterministically attempts to spend the oldest transactions first, any further attempts to create transactions will be seen as a double-spend attempt by the network. As long as the client is only communicating with the attacking nodes, he is incapable of making any further purchases.
In Electrum, the solution may be trivial. Download the client source, modify the seed server list to be more trustworthy. Still, that there is now explicit trust in the network nodes is a far cry from the security of the original protocol design.
In bitcoinj, there is no solution. In fact, an attacker only needs to control one node; bitcoinj simply ignores all further communication about valid blocks it has seen only once before! The comments in the bitcoinj source code seem to suggest this was a performance optimization. However, not doing this would open bitcoinj up to another type of attack, to which Electrum is already vulnerable: a “double-purchasing” attack.
EDIT: The preceding paragraph doesn't completely apply as per the previous edit, but I'm leaving it in for consideration with regards to the first attack. Bitcoinj still ignores older blocks, even if they have new, relevant transactions in them.
Suppose a merchant M is in collusion with an attacker A who runs a series of nodes N0…Nn. Suppose also, that a client C, using a wallet Wc, wishes to purchase from M, using a wallet Wm, both of which are known to M and subsequently A.
A constructs N0…Nn such that certain transactions to Wc are silently ignored (call them Ti); valid in the network but never delivered to C. A waits until there are no more unspent transactions to Wc not in Ti older than some T in Ti. Upon an attempted transaction (Wc -> Wm)0, Nk with 0 <= k <= n sends the transaction to other peers but does not respond to C. Instead, Nk responds with some Ts0…Tsn in Ti such that the sum of outputs in Ts0…Tsn to Wc is greater than or equal to the outputs of (Wc -> Wm)0. C accepts these Ts0…Tsn. An unaware user may elect to begin a new transaction (Wc -> Wm)1 in lieu of a response regarding (Wc -> Wm)0. Because (Wc -> Wm)1 will use as inputs from unspent transaction outputs not used in (Wc -> Wm)0, indeed not yet used at all, the network will accept both transactions as valid! A may elect to continue this process for any (Wc -> Wm)n so long as the sum of all Tin in Ti is sufficient to cover the costs of all Tout in (Wc -> Wm)0…(Wc -> Wm)n. A has effectively coerced C into double-purchasing.
Even if Electrum and bitcoinj randomly chose unspent outputs as inputs for the new transaction, as does the reference Bitcoin client, the probability that such an attack could succeed at least once is directly proportional to the input activity of the target wallet, and the attacker would only need to withhold that particular outgoing transaction to succeed!
I’m looking for some peer review on this. If these scenarios are possible, the proliferation of SPV clients for Bitcoin (and perhaps in the future, Dogecoin) could make an adversary’s life very easy! Again, constructive hole-poking and educative discussion weakening this hypothesis are very, very welcome.
EDIT: And I'm all out of characters! More edits will end up in the comments.
submitted by chia_pet to dogecoin [link] [comments]

[Social X] Architecture of A Decentralised System for Social Payment and Services

Dear fellow Reddheads:
It's been a month since the successful launch of PoSV, which marked the end of stage one of Reddcoin project. There were three main goals for stage one:
  1. fair distribution of Reddcoin to common users (tipping), miners (mining) and investors (IPCO).
  2. an innovative algorithm to secure the network and encourage ownership, participation and decentralisation (PoSV).
  3. to build out a team of super talented and trustworthy developers.
The three goals have all been achieved so it's time for us to enter stage two: the buildout of services to make Reddcoin actually useful. This is what Social X is meant for. I'm still polishing the whitepaper to make it live up to my own self-imposed high standard, but I think the time is right for me to unveil it in broad strokes. There are three main problems Social X aims to solve.

Social X: why are wallets so difficult to use?

To achieve wide adoption of Reddcoin (or any cryptocurrency) by the non-tech-savvy general public, wallets must solve the following issues:
Ever increasing blockchain size discourages users from running full-blown wallets. It takes too much time and efforts to install or repair. A common user tends to find the process frustrating or even impenetrable and is forced to either give up adoption or rely on 3rd-party service providers (e.g. exchanges, wallets using ReddAPI) to take full control of her fund. Blockchain size grows everyday and grows faster with wider adoption.
Current wallets generate private keys randomly. As a user engages in staking or normal transactions, she has to back up wallet.dat file periodically to make sure all newly generated private keys are backed up. If wallet.dat file is corrupted or lost, there is no way to recover lost fund.
Again, due to the fact that private keys are randomly generated, it's impossible for a user to share the same wallet.dat file across multiple devices (e.g. desktop, iOS, Android) and multiple platforms (e.g. Windows, Linux, Mac). Different copies of wallet.dat will get out-of-sync. A user has to manage each wallet independently, which leads to significant operational burden and risk.
It would be extremely valuable for a service provider, such as an exchange or e-commerce site, to be able to generate unique public keys to receive fund while putting the corresponding private keys in cold storage. The impact on security is significant.

Social X: why is it so hard for me to tip someone?

One essential feature of Bitcoin is pseudo-anonymity. To pay someone, you need to get hold of her impenetrable public hash key, somehow. And the hash key, i.e. the wallet address, may not be valid a moment later because the owner might have lost the corresponding private key. Ironically, this awkwardness, even backwardness, is not perceived as a disadvantage by almost all the cryptocurrencies. In fact, on the contrary, the single biggest, hottest, most wanted feature is full decentralised anonymity, which has seen the rise and fall of many cryptocurrencies and their copycats. While all the other cryptocurrencies compete with each other on this front, Reddcoin, aiming to the social currency of the digital age, moves in the opposite direction. Social lives are not possible without social identities.

Social X: why can't I use a service without giving up control?

The vast majority of 3rd-party service providers which hold fund on a user's behalf has exclusive full control of her private keys. If a service is indeed worthy, a user has no choice but to trust the 3rd party with security and integrity. It's ironic, to say the least, that cryptocurrencies which are created to remove exactly this need for blind trust in middlemen end up in a much worse position than fiat currencies due to the fact that many cryptocurrency companies are unregulated and incompetent. Then the question is: is there a way to create an ecosystem where anyone can write and provide valuable social applications in a fully decentralised fashion?

Social X: Architecture for a Decentralised System for Social Payment and Services

Social X has many components which are already being actively developed. Below I give a brief description of some of them.
  1. In the future, there will be two types of official Reddcoin wallets. QT wallet and reddcoind are full wallets required to run a full node. A second type of wallets, called thin wallets or SPV wallets will use the technology of Electrum modified and enhanced to support PoSV and staking. These wallets include mobile wallets on iOS, Android, next-generation Social Wallet on desktop and wallets inside browsers (Chrome/Firefox/Safari). I've already finished writing and started testing the reference implementation of Reddcoin Electrum server and client. Each client only needs to download 25M of data vs the current full blockchain at 660M. This is how we solve the blockchain size problem.
  2. All our official wallets, whether full or thin, will be deterministic. All private keys are generated deterministically from a long passphrase. This passphrase is all you need to remember and backup and with it you can fully recover your wallet and funds anytime anywhere. You will also be able to support multiple wallets on multiple platforms and devices and they will all be in sync. This is how we solve the portability problem.
  3. All our official wallets, whether full or thin, will be hierarchical. They will allow users to generate public keys on demand while keeping private keys in cold storage. This is how we solve the cold storage problem.
  4. I'm writing code (~30% finished) for sth we call Reddcoin Social ID (Redd-ID):
    • It's a new service provided at the blockchain level.
    • It allow users to associate a username with one private key.
    • The user can choose to bundle extra information such as email, address and avatar.
    • The information is public and embedded in the blockchain. As a result, any user can send Reddcoin to another by simply specifying the recipient's Redd-ID.
    • Redd-ID registration costs Reddcoins. The costs vary depending on many factors such as the length of the username. For example, we expect popular names like tom to cost at least 7 figure.
    • Redd-ID registration is verified in PoSV blocks. Therefore all active Reddcoin stakers will be the provider of Redd-ID service.
    • Redd-ID registration fee goes to the Reddhead who successfully mints the PoSV block that verifies and confirms the registration. In a sense, it will feel like a lottery. And this is why this service doesn't make sense for any PoW coin where each block is pool-mined.
    • Redd-IDs can be transferred to new addresses and by default auto-expire annually and can be renewed.
    • Small Reddcoin holders, as long as they keep staking, may double, triple or 10x their existing holdings just by receiving registration fees.
    • Businesses and organisations can register usernames for purposes like receiving donation.
  5. There will be several services available to provide more ways for Redd-ID to be used on Internet. I don't want to disclose all our cards here. Please wait for my whitepaper and see what we have for you as surprises. Meanwhile, do share with us how you imagine Redd-ID can be used.
  6. Different components of Social X will allow decentralised tipping across all social networks. In our next-generation social tipping platform, there will be no tipbots! When you tip someone on Reddit, Twitter, Twitch, Youtube or Facebook, the tipping goes straight from local wallet, whether on your mobile or desktop to the recipient.
  7. There will be APIs to allow 3rd parties to write and offer decentralised social applications.

Social X: where are we now?

  1. I'm finishing the whitepaper in coming weeks (while writing a lot of code). The whitepaper will contains much more information than this post.
  2. Reddcoin Electrum wallets for iOS and Android are being actively developed.
  3. Reddcoin full wallets (QT/reddcoind) are already hierarchical deterministic in the development branch and are being internally tested.
  4. The Social Tipping Platform is being actively developed.
  5. I need volunteers to host and test Reddcoin Electrum server and clients. I'll make a separate post next week.


Below I'll only answer questions selectively. Much more details will be available in the whitepaper and there is no reason to jump the gun and repeat it here. Stage one took us 6 months. We expect stage two to take 6 months also. It may be the most exciting period in the history of Reddcoin project.
submitted by laudney to reddCoin [link] [comments]

NAV Roadmap - KR translation

Hey guys, been MIA for a few weeks getting things done. Slowly and steadily getting translations coming in from friends and translators: (Hoping our friend Mr. Fry hasn't translated this yet) -
Project Roadmap : 프로젝트 로드맵
Where we’re going : 우리가가는 곳
Cryptocurrencies are complicated, and it’s our mission to change that. The Nav Coin wallets are easy to use and have great built in privacy features : Cryptocurrency 는 복잡하고, 그것을 바꾸는 것이 우리의 사명입니다. Nav Coin 지갑은 사용이 간편하며 개인 정보 보호 기능이 뛰어납니다.
Upcoming Projects : 다가오는 프로젝트들
Our upcoming projects continue on that journey of providing great software that does the heavy lifting so you don’t have to. : 우리의 다가오는 프로젝트는 당신이 할 필요가 없도록 무거운 짐을하는 훌륭한 소프트웨어를 제공하는 여정에서 계속됩니다.
Navtech wallet rebuild : NAVTech지갑 재구성
To simplify running a NAVTech node, we are looking to integrate Nav Coin and the Subchain into a single multi-chain wallet. This will make it easier for everyone to process anonymous transactions, and is the precursor to the next generation of the NAVTech system. -NAVTech 노드 실행을 단순화하기 위해 Nav Coin과 Subchain을 단일 다중 체인 지갑에 통합하려고합니다. 이렇게하면 익명의 거래를 모든 사람이 쉽게 처리 할 수있게되며 차세대 NAVTech 시스템의 전조가됩니다.
Upgrading our anonymous tech - NAVTech 2.0 : 익명 기술 업그레이드 - NAVTech 2.0 With the multi-chain wallet working, we will then begin to port the NAVTech scripts into the wallet itself. At this point we would also look at how we can open the cluster system up to being a trustless mesh network so anyone can easily participate and gain rewards. :다중 체인 지갑이 작동하면 NAVTech 스크립트를 지갑 자체에 포팅하기 시작합니다. 이 시점에서 우리는 클러스터 시스템을 신뢰할 수없는 메쉬 네트워크로 열어 누구나 쉽게 참여하고 보상을 얻을 수있는 방법을 살펴볼 것입니다.
Nav coin direct - An easier way to buy : NAVNav Coin Direct - NAV를 구입하는보다 쉬운 방법 With the success of our PayPal NAV purchasing through our merchandise store we are going to build a purchasing platform for buying NAV with Fiat Currencies, Pay Pal, Credit Cards and more. : 우리의 상품 점포를 통해 구매 한 PayPal NAV의 성공으로 우리는 피아트 통화, Pay Pal, 신용 카드 등으로 NAV를 구입할 수있는 구매 플랫폼을 구축 할 것입니다.
Currently in progress : 현재 진행 중
Mobile & web wallets @95% : 모바일 및 웹 지갑 @ 95 % After the release of Nav Coin 4.0.0 we will begin working on a full suite of Mobile & Web Wallets based on the Copay source code. Copay is an amazing javascript based wallet which will provide us with a great platform to build our Nav Coin wallets on top of. : Nav Coin 4.0.0이 출시되면 Copay 소스 코드를 기반으로 한 전체 모바일 및 웹 지갑 제품군에 대한 작업을 시작합니다. Copay는 자바 스크립트 기반의 놀라운 지갑으로 Nav Coin 지갑을 위에 쌓을 수있는 훌륭한 플랫폼을 제공합니다.
Anonymous DApps Planning @ 90% : 익명의 DApps 기획 @ 90 % We are looking into the possibility of upgrading Nav Coin and the Subchain to implement smart contracts. The idea being this will enable people to build Anonymous Decentralized Apps (ADapps) on top of our existing dual blockchain system. This milestone for the feasibility phase of the project where we research Dapp platforms and frame up what ours will look like. : 우리는 현명한 계약을 구현하기 위해 Nav Coin과 Subchain을 업그레이드 할 수 있는지 검토하고 있습니다. 이 아이디어는 기존의 이중 블록 체인 시스템 위에 ADAP (익명 분산 응용 프로그램)를 구축 할 수있게합니다. Dapp 플랫폼을 연구하고 우리의 모습을 구성하는 프로젝트의 실현 가능성 단계에 대한이 이정표.
Marketing Roadmap @ 75% : 마케팅 로드맵 @ 75 %
With our Q1 releases out of the gate, our marketing team will be able to refocus on the wider branding message and marketing strategy. The first step is to formalise a marketing roadmap and present our marketing plan. : 당사의 1 분기 릴리즈를 통해 마케팅 팀은보다 광범위한 브랜딩 메시지 및 마케팅 전략에 다시 집중할 수있게 될 것입니다. 첫 번째 단계는 마케팅 로드맵을 공식화하고 마케팅 계획을 제시하는 것입니다.
Rebuilding the Subchain @ 50% : 서브 체인 @ 50 % 재건
With the successful upgrade to the new Nav Coin Core, we will be aligning the subchain source with the new code base. This will mean restarting that blockchain and also preparing to integrate the Subchain into the Nav Coin wallet. : 새로운 Nav Coin Core 로의 성공적인 업그레이드를 통해 서브 체인 소스를 새로운 코드 기반에 맞출 것입니다. 이것은 해당 블록 체인을 다시 시작하고 Nav Chain 지갑에 Subchain을 통합 할 준비를하는 것을 의미합니다.
NavTech Polymorph @ 33% : NavTech 다 형체 @ 33 % NAVTech Polymorph is a fusion of NAVTech’s Anon transactions and Changelly’s instant exchange. It will enable users to send any one of 25+ cryptocurrencies anonymously through the dual blockchain powered NAVTech anonymous transaction system. : NAVTech Polymorph는 NAVTech의 Anon 거래와 Changelly의 즉석 거래를 융합 한 것입니다. 사용자는 익명으로 이중 차단 체인 전원 공급 장치 NAVTech 익명 트랜잭션 시스템을 통해 25 개 이상의 암호 화 된 통화 중 하나를 보낼 수 있습니다.
Nav Pi JS @ 15% After the successful launch of NavPi, we are working towards streamlining the interface. This means a full redevelopment using Angular2 served by NodeJS. This also aims to improve the performance of the front end giving a smoother user experience. : NavPi를 성공적으로 출시 한 후 우리는 인터페이스 간소화를 위해 노력하고 있습니다. 이는 NodeJS가 제공하는 Angular2를 사용하여 전체 재개발을 의미합니다. 또한 프런트 엔드의 성능을 향상시켜보다 원활한 사용자 환경을 제공하는 것을 목표로합니다.
Completed Projects : 완료된 프로젝트
NavTech v1.2
NavTech 1.2 will address the metadata inference of NavTech transactions when the system is running at low volume. We will be implementing multiple output addresses, variable fees, time delays and dummy transactions. : NavTech 1.2는 시스템이 낮은 볼륨에서 실행될 때 NavTech 트랜잭션의 메타 데이터 추정을 처리합니다. 우리는 다중 출력 주소, 가변 수수료, 시간 지연 및 더미 트랜잭션을 구현할 것입니다.
Nav Coin Core 4.0.4
This is an important update which includes all the updates necessary to be compatible with NavTech 1.2. Updating to this version is mandatory due to the major changes to how NavTech works : 이 업데이트는 NavTech 1.2와 호환되는 데 필요한 모든 업데이트를 포함하는 중요한 업데이트입니다. 이 버전으로의 업데이트는 NavTech 작동 방식의 주요 변경 사항 때문에 필수적입니다.
NavPi 1.0.1
This is the software which the pre-built NavPi’s are shipping with from our store. This version still uses the same UI which was in 1.0.0 but the image has been rebuilt from the ground up with extra security features. : 이것은 사전 제작 된 NavPi가 우리 가게에서 배송하는 소프트웨어입니다. 이 버전은 여전히 ​​1.0.0과 동일한 UI를 사용하지만 추가 보안 기능으로 이미지가 처음부터 다시 작성되었습니다.
Copy of Pre Built NavPi's : 사전 제작 된 NavPi 사본
We are working towards sourcing and supplying NAV branded NavPi units on the Nav Coin Store. These will ship with the image pre-loaded onto the memory card so all you will need to do is plug them in and send the coins. : Nav Coin Store에서 NAV 브랜드의 NavPi 장치를 소싱 및 공급하기 위해 노력하고 있습니다. 이것들은 메모리 카드에 미리로드 된 이미지와 함께 제공 될 것입니다. 그래서 당신이 할 일은 플러그를 꽂아 동전을 보내는 것뿐입니다.
NAVTech 1.1
We are reviewing and fully unit testing the NAVTech source code. First optimizing and testing the existing source and fixing some small bugs we have listed as issues on the github project : 우리는 NAVTech 소스 코드를 검토하고 완전히 테스트하고 있습니다. 먼저 기존 소스를 최적화하고 테스트하고 github 프로젝트의 문제로 나열한 몇 가지 작은 버그를 수정합니다.
Nav Coin Core 4.0.0
We are rebuilding Nav Coin Core up to date with the Bitcoin 0.13 source. This will increase Nav Coin’s stability, capabilities and ability to integrate with other services. By updating to 0.13 we will get some great technical benefits including the capability to have a Nav Coin Insight API and Segregated Witness. : Bitcoin 0.13 소스를 사용하여 Nav Coin Core를 최신으로 재구성하고 있습니다. 이것은 Nav Coin의 안정성, 기능 및 다른 서비스와의 통합 능력을 향상시킵니다. 0.13으로 업데이트하면 Nav Coin Insight API 및 분리 된 증인을 보유 할 수있는 능력을 포함하여 많은 기술적 이점을 얻을 수 있습니다.
NavPi StakeBox
A low-energy Nav Coin staking solution based on the Raspberry-Pi platform. NAV’s highly anticipated web interface enabled staking unit, offers a more energy efficient way to earn Nav Coin rewards and participate in transaction verification. : 라스베리 -PI 플랫폼 기반의 저에너지 Nav Coin 스테 킹 솔루션. NAV의 높은 기대를 모으고있는 웹 인터페이스를 통해 스테이 킹 장치가 가능해 Nav Coin 보상을 획득하고 거래 검증에 참여할 수있는보다 에너지 효율적인 방법을 제공합니다.
Website Redesign : 웹 사이트 재 설계
We are redesigning the main Nav Coin website with the aim of giving a better experience to new and returning users. We have thoroughly mapped out the User Journey and hope this makes the site much easier to navigate and use. : 신규 및 재 방문자 사용자에게보다 나은 경험을 제공하기 위해 Nav Coin 웹 사이트를 재 설계하고 있습니다. 우리는 User Journey를 철저히 분석하여 사이트를 훨씬 쉽게 탐색하고 사용할 수 있기를 바랍니다.
Decentralization Implementation : 지방 분권화 구현
The release of the new Navtech value-transfer system, was a key piece of the decentralization network implementation. The new architecture allows Navtech servers to operate in trusted clusters and form their own private mesh network of processing servers which anyone will be able to run and earn rewards from. : 새로운 Navtech 가치 이동 시스템의 출시는 분산화 네트워크 구현의 핵심 요소였습니다. 새로운 아키텍처를 통해 Navtech 서버는 신뢰할 수있는 클러스터에서 작동하고 누구나 실행할 수 있고 보상을 얻을 수있는 자체 처리 메쉬 네트워크를 형성합니다.
Anonymous Merchant Integration : 익명 판매자 통합
Once we have finished the initial merchant gateway, we will integrate the merchant gateway with our anonymous network to allow for the anonymous purchasing of products. : 초기 상인용 게이트웨이를 마친 후에는 제품의 익명 구매를 허용하기 위해 가맹점 게이트웨이를 익명 네트워크와 통합 할 것입니다.
Merchant Gateway : 판매자 게이트웨이
Nav Coin has been added to Coin Payments merchant gateway system. This allows merchants to accept Nav Coin in their physical stores and also on their websites. : Nav Coin이 Coin Payments 가맹점 게이트웨이 시스템에 추가되었습니다. 이를 통해 판매자는 실제 매장에서 Nav Coin을 수령하고 웹 사이트에서도 Nav Coin을 수령 할 수 있습니다.
NAVTech NodeJS
Rebuilding the Nav Coin Anonymous Tranasction System “Navtech” is a top priority for us. The redevelopment of the system allows for a smoother transition to a fully decentralised system. : Nav Coin 익명 트랜샌 션 시스템 재 구축 "Navtech"은 우리에게 최우선 순위입니다. 시스템을 재개발하면 완전히 분산 된 시스템으로 원활하게 전환 할 수 있습니다. Thin Client for Desktop : 데스크탑 용 씬 클라이언트
Our custom X13 Electrum server also enables us to build a thin client for desktop. This will be a great addition to the Nav Coin software suite and give people instant access to their Nav Coin without having to sync the entire block chain! : 우리의 커스텀 X13 Electrum 서버는 데스크톱 용 씬 클라이언트를 구축 할 수있게 해줍니다. Nav Coin 소프트웨어 제품군에 추가 된 기능으로 전체 블록 체인을 동기화하지 않고도 Nav Coin에 즉시 액세스 할 수 있습니다!
NAVTech Public Release : NAVTech 공개 버전
With the main block chain successfully hard forked, the network stabilised and the major exchanges successfully running on the new wallet we are able to move forward into the final stage of deployment. The double encrypted Navajo Anonymous network will be fully functional and open to the public from Monday 23rd of March 2015. : 메인 블록 체인이 성공적으로 단단히 고정되면서 네트워크가 안정화되고 주요 교환기가 새 지갑에서 성공적으로 실행되어 배포의 최종 단계로 나아갈 수 있습니다. 이중 암호화 된 Navajo 익명 네트워크는 2015 년 3 월 23 일 월요일부터 모든 기능을 제공하며 공개됩니다.
NAVTech Beta Test : NAVTech 베타 테스트
The public beta test of our Nav Anonymous Transactions system will begin on the 1st of February 2015. It will run for two weeks at which point it will close and we will begin processing the beta results. During the testing phase there will be a bounty set for anyone who can successfully trace the transactions from origin to destination. The beta test will be unencrypted to help us with analysis and testing. : Nav 익명 거래 시스템의 공개 베타 테스트는 2015 년 2 월 1 일부터 시작될 예정이며, 2 주일 후에 실행될 예정이며 그 시점에서 베타 결과 처리가 시작됩니다. 테스트 단계에서 원산지에서 목적지까지 트랜잭션을 성공적으로 추적 할 수있는 사람을 대상으로 현상금이 설정됩니다. 베타 테스트는 분석 및 테스트에 도움이되는 암호화되지 않은 것입니다.
Faucet : 수도꼭지
We will run a NAV faucet as well as the POS Wallet faucet. You will be able to register your wallet address with the faucet and be in the lottery to get sent free NAVs. : 우리는 NAV 수도꼭지뿐만 아니라 POS 월렛 수도꼭지를 운영 할 것입니다. 지갑 주소를 수도꼭지에 등록하고 추첨을 통해 무료 NAV를받을 수 있습니다
Block Explorer : 블록 탐색기
We have been added to the Cryptoid Block Explorer. The block explorer allows people to look up wallet addresses and see its public balance and transactions. : Cryptoid Block Explorer에 추가되었습니다. 블록 탐색기를 사용하면 사람들이 지갑 주소를 조회하고 대중의 균형과 거래를 볼 수 있습니다.
submitted by DijoinKlink to NavCoin [link] [comments]

Groestlcoin Release September 2018


As always, the past 3 months since 22nd June have been crazy busy. The bears might still be around, but the show must go on and of course has not slowed the Groestlcoin development team in the slightest. Here’s a quick overview of what has already happened since the last release: - Integrated into the bitbns exchange, with the ability to buy Groestlcoin directly with the Indian Rupee. - Groestlcoin Rebrand Vote – Whilst there was much talk and push for a rebrand vote, the overall result was almost unanimously in favour of keeping our unique and conversation-starting name. With just 83 votes to Rebrand, and 2577 votes to No Rebrand. Thank you for all who voted, the funds raised are being used to fund ongoing hosting and development costs. - Integrated into the Cryptobridge exchange. Cryptobridge is a popular decentralised exchange where you always hold the private keys to your funds, only YOU have access to them. - Groestlcoin has been added to SimpleSwap – Groestlcoin can now be swapped with over 100 other cryptocurrencies, without signing up! - Groestlcoin has been added to UnoDax, one of the leading cryptocurrency exchanges in India, with TUSD, BTC and INR trading pairs. - Groestlcoin has been added to 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!

Melis Wallet

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

How Melis Works?

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

Guarda Wallet

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

Integrated into HolyTransaction

What is HolyTransaction?

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


For more information, visit Holy Transaction here.

Integrated into NEXT Wallet

What is NEXT?

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


For more information, visit NextWallet here.

Integrated into Blockchain Financial

What is Blockchain Financial?

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

Blockchain Financials mission

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

More information from Blockchain Financial

Back in 2014, the world was taken by storm when Facebook approved the first cryptocurrencies tipping apps. The first was for Dogecoin, and the second was for multiple coins.
The project was hosted on 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)

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 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

Groestlcoin Electrum-GRS 3.2.2 - Ledger & Trezor Edition

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



Electrum-GRS Mobile Android

What is Electrum-GRS Mobile?

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


Groestlcoin EasyVanity Released

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


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

Groestlcoin Sentinel (Android & Blackberry) – Mainnet + Testnet

What is Sentinel?

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

What's New?

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

Groestlcoin Web Wallet Update 1.4

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


Kryptowährung Wallet Electrum ist eine Art dünner Wallet - diese Ressource erfordert keinen vollständigen Sprung in die Geschichte der Blockchain, was ein erhebliches Gewicht an Speicher beansprucht. Ein charakteristisches Merkmal von Thin Clients ist gleichzeitig die Speicherung von persönlichen Informationen der Benutzer auf Remote-Servern von Drittanbietern. Electrum Bitcoin Wallet. Impressum This website is hosted by Electrum Technologies GmbH Electrum Technologies was founded by Thomas Voegtlin in 2013. Its mission is to develop, package and distribute Electrum software, and to provide services to Bitcoin users and businesses. Electrum is a lightweight Bitcoin client, based on a client-server protocol. It was released on November 5, 2011. Main features. Encrypted wallet: the file that contains bitcoin private keys is protected with a password, and never leaves the user's computer.; Deterministic key generation: If you lose your wallet file, you can recover it from its seed.You are protected from your own mistakes. Electrum is a lightweight Bitcoin client, based on a client-server protocol. It was released on november 5, 2011. Main features: Encrypted wallet: the file that contains bitcoin private keys is protected with a password, and never leaves the user's computer.; Deterministic key generation: If you lose your wallet file, you can recover it from its seed.You are protected from your own mistakes. If you downloaded the official package (tar.gz), you can run Electrum from its root directory, without installing it on your system; all the python dependencies are included in the 'packages' directory. To run Electrum from its root directory, just do:

[index] [5560] [30843] [37357] [48406] [14049] [28629] [23233] [3585] [17938] [51178]


- The security tradeoffs between using an SPV wallet versus a full node client - How Bitcoin aliases could do away with Bitcoin addresses Links mentioned in this episode: - Electrum: http ... youtube.com