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Our first generation hardware wallets were made of military-grade aerospace aluminum. We’ve stripped all that down to just focus on air-gapping your private keys.

Our first generation hardware wallets were made of military-grade aerospace aluminum. We’ve stripped all that down to just focus on air-gapping your private keys.

https://preview.redd.it/0rogeunfujv41.png?width=1024&format=png&auto=webp&s=8a2cf5eff6f30a36fd7e86e16331eb40b4072627
Hey bitcoin! I'm Lixin, longtime bitcoiner and creator of Cobo Vault.
I come from a background in the electronic hardware industry, and experienced one of my products being featured in Apple Stores around the world. Back in 2018 Cobo CEO Discus Fish, who also co-founded F2Pool, invited me to help build Cobo’s hardware product line. As we had strong ties to miners in China, we naturally designed the 1st gen with them in mind. In China, mining farms are nearly always built in very isolated places where there is very cheap wind or water electricity. When we built our 1st generation Cobo Vault hardware wallet, we needed to maximize the durability of the device in addition to its security. We used aerospace aluminum rather than plastic and made it completely IP68 waterproof, IK9 drop resistant, and military standard MIL-STD-810G durable for the mining industry.
Things changed last year when I went to Bitcoin 2019 and talked to lots of hodlers in the States. I found that 95% of them don’t care about durability. I asked them if they were afraid of their home being flooded or burned down in a fire. The answer is - yes, they are afraid of these things, but see them as very low possibilities. Even if something were to happen, they said they would just buy another HW wallet for 100 dollars. From these conversations, it became more and more clear we should design a product around a normal hodler’s needs.
Our 2nd gen product compromises on durability but doesn’t compromise on security.
Most hodlers share some needs with miners:
  1. Hodlers want a more air-gapped solution so we kept QR code data transmission between your hardware wallet and the companion app which is also auditable.
  2. A Secure Element is the strongest wall of protection from physical attacks. We are the first hardware wallet - also maybe the first electronic product with SE - to have open source SE firmware.
  3. A battery can be a significant weak point. The 2nd gen continues the legacy of detachable batteries to prevent corrosion damage and will also support AAA batteries in case your battery dies someday.
  4. The 2nd gen also keeps the 4-inch touchscreen so you don’t need to suffer from tiny buttons and little screens anymore. Human error is one of the biggest reasons people lose their assets.
  5. We kept other features like the self-destruct mechanism and Web Authentication, which prevent side-channel and supply chain attacks.
If you'd like to read more about these features, check out our blog posts.
Aside from the legacy of the 1st gen, our 2nd gen product will have:
  1. Open source hardware wallet application layer and Secure Element firmware code. With the open source firmware code, you can see: random number generation, master private key generation, key derivation, and the signing process all happen within the SE and your private keys never leave.
  2. At the Bitcoin 2019 conference half the hodlers I met told me they own multiple hardware wallets which they use on the go. We added a fingerprint sensor you can use to authorize transactions without typing in your password. No need to worry about surveillance cameras when using your hardware wallet in airports.
  3. We will also support PSBT (BIP174) to be compatible with third-party wallets like Electrum or Wasabi Wallet in case people have need of using Cobo Vault with their own node or coinjoin. Multisig between Cobo Vault and other wallets will be realized to prevent single point failure with any brand of hardware wallet.
  4. By sacrificing the durability, we successfully controlled the price under 100 USD for the basic version.
  5. BTC-only firmware version for people who want to minimize the codebase for less of an attack surface.
We truly appreciate the support from the community and are giving away free metal storage Cobo Tablets with every purchase of our 2nd gen for a week! Add a tablet to your cart and place your order before May 5th, 8 AM PST to claim your free metal storage. Find us on Twitter CryptoLixin and CoboVault - any suggestions or questions are welcome!
submitted by Bright_Charge to Bitcoin [link] [comments]

We’ve been working on a new product release for a year and want to hear your opinions on the product. Read on for product information and our vision for hardware wallets.

TL;DR Key features of Cobo Vault 2nd gen we are going to launch:
Hey bitcoin! I'm Lixin, a longtime Bitcoiner and creator of Cobo Vault.
I come from a background in the electronic hardware industry, and experienced one of my products being featured in Apple Stores around the world. Although my interest goes back to 2010, my career intersected Bitcoin when Discus Fish (CEO of Cobo) invited me to help build Cobo’s hardware product line. Discus Fish is also the co-founder and CEO of f2pool, one of the largest mining pools currently in the world, and one of the earliest advocates of bitcoin in China.
Back in 2018 we built our 1st generation Cobo Vault hardware wallet. As we had strong ties to miners in China, we naturally designed the 1st gen with them in mind. For those who are not familiar with the mining industry in China, mining farms are nearly always built in very isolated places where there is very cheap wind or water electricity. As the miners would take their storage into these isolated regions, we needed to maximize the durability of the device in addition to its security. We used aerospace aluminum rather than plastic and made it completely IP68 waterproof. We also gave it a hardshell metal case you can put it in, which is IK9 drop resistant and passes the American military durability test MIL-STD-810G.
As for the electronic components inside the device, in order to maximize security, we made it as air-gapped as possible with QR codes. We see this as an important choice because USB cables and Bluetooth are not transparent and have a bigger attack surface. With QR codes you can see exactly what is going on and do not have to connect to a laptop which could have malware on it. QR code interaction needs a camera and a more complicated system which needs to be supported by high-level chips.
All these come with a cost, and the 1st generation isn’t as accessible for average hodlers. For more details on the product, visit here.
Things changed last year when I went to Bitcoin 2019 and talked to lots of hodlers in the States. I found that 95% of them don’t care about durability. I asked them if they were afraid of their home being flooded or burned down in a fire. The answer is - yes, they are afraid of these things, but see them as very low possibilities. Even if something were to happen, they said they would just buy another HW wallet for 100 dollars. From these conversations, it became more and more clear that the position for miners and hodlers is totally different.
After coming back from that conference, our team began the almost one year journey of designing our 2nd gen product. It compromises on durability but doesn’t compromise on security.
We designed the 2nd gen product all around a normal hodler’s needs.
Obviously hodlers share some common needs with miners:
If you'd like to read more about these features, check out our blog posts here.
Aside from these legacies from the 1st gen, our 2nd gen product will have some other big improvements:
Personally, I am a bitcoin maximalist and also a big fan of the KISS principle. We will also release a BTC-only firmware version for people who want to minimize the codebase for less of an attack surface.
Thank you for reading until here. More details like final price would be released later when we officially release the product in late Apr. Any suggestions or questions are welcome. Also you can find me @CryptoLixin or @CoboVault on Twitter! Ears are widely open!
submitted by Bright_Charge to Bitcoin [link] [comments]

Bitcoin Cash needs to move on from Lightning and BTC's stagnation.

Guys, I'm concerned that we're looking in the wrong direction. Calling bullshit on BTC and Lightning Network is obviously important for asserting Bitcoin Cash's legitimacy, but this singular focus is blinding us to the difficulties ahead. I worry that we're falling into the illusion that Bitcoin Cash has no real technical competition, meanwhile there's amazing development happening in other crypto ecosystems, especially Ethereum.
I think interacting with these communities would be a far more fruitful source of competition and inspiration for BCH development. I am by no means an expert on what's happening on Ethereum, but let me run you through a few of the projects I've discovered, to show you what I mean.

Next Generation Wallets

For instance, check out this article, "The (private) key to mass adoption", which introduces a new approach to wallets on Ethereum via Argent Wallet. We're talking about next-gen UX in crypto:
All of this is done without a custodial solution using smart contracts.

DAI: An Ether Standard?

Then there's MakerDAO and DAI which allows Ether to be locked up in a smart contract as collateral for a stablecoin pegged to the US dollar. What's especially cool about this way of creating a stablecoin is that ETH holders do not need to trade away their ETH to transact with DAI. Instead, they can lockup their ETH in a smart contract and recover it simply by repaying the loan, meaning they can still enjoy any increase in the value of their collateralised Ether. Some are suggesting that with this model MakerDAO have effectively created an Ether alternative to the gold standard.

Cash

Austin Griffith has used an ETH sidechain called xDai, which runs DAI with 5 second blocks, to create a simple and intuitive mobile wallet based in a web browser. It's called Burner wallet, and its aim is to make instant, cash-like transactions with crypto available to anyone and everyone. It's worth noting that the sidechain trades ETH's decentralisation for instant transactions. The wallet itself can transact with QR codes (from the browser) and send with links, meaning xDAI can be sent in a text or Whatsapp message. Each Burner wallet is designed to be ephemeral and burnt after daily use.

So, what I'm trying to say is that Lighting Network and the stagnation on BTC is a distraction, not only for BTC but also for us when it consumes all of our energy and attention. If we're right about BTC, then it's already dead. The stuff above is where the action is. It's the real competition. There's some exciting development happening on BCH right now with Cash Shuffle, Cash Accounts, and Badger wallet, but this needs be the focus if we're going to cultivate a community that can make P2P e-cash a world-changing phenomenon.
submitted by CatatonicAdenosine to btc [link] [comments]

Exchanges & Proof of Keys: A Ramble on Operationalizing "Not your Keys, Not your Bitcoin."

This started as a thread reply about banks being a pain in the ass but per usual I got diarrhea of the mouth and it turned into a wall of text appropriate for it's own post. There's been a lot of talk about exchanges doing some unsavory things and a recent call to pull what crypto you have off from custodial intermediaries by January 3, a so-called "Proof of Keys" movement. This is all IME/IMO, obv., and aimed toward new crypto users or users who havenever held their own keys. If you have better ideas or disagree, please put them in the comments 👇
I've been mucking about in exchanges trying to find a good balance of user friendliness and control over crypto, especially for newcomers for whom decentralized exchanges are yet another new and possibly nerve wracking thing to learn. Gemini now has a slick minimalist Android app with none of the mandatory 17 day/30 day/until-you-reach-retirement holds that Coinbase imposes despite my money being cleared by the bank. As soon as the ACH transaction clears on Gemini, which is usually a matter of a few days, your crypto is able to be transferred to your wallet of choice. Yes, they need ID and have 1% fees for buying/selling, but it took maybe an hour to confirm my ID and the lack of arbitrary holds seem like they're interested in preserving user control over crypto rather than forcing people to hold their keys in a glorified crypto bank.
You can skip the centralized exchanges entirely by using Bisq once you have a general comfort level with using bitcoin. Until then, centralized exchanges aren't ideal but are necessary until adoption is a bit more widespread and bitcoin is routinely used as a medium of exchange person to person.
Getting your crypto off exchanges and in a wallet is a pretty basic principle--not your keys, not your crypto--but one certain to make people a little nervous with all the horror stories of losing bitcoin. LedgeTrezor makes wallet creation & secure storage pretty foolproof and it really surprising to me that there aren't more mobile wallets with Ledger integration. Monerujo is kind of amazing with its seamless Ledger integration so private keys are never kept on your phone, AFAIK Mycelium is the best Ledger integrated Bitcoin wallet on Android; maybe someone can recommend another.
I just carry a tiny cable and have an USB adapter for my phone. After that it works just like the Ledger Live App, confirm address, confirm transaction on Ledger, good to go. I keep a couple Ledgers, one for a daily drivechequeing the others for storage/savings.
My recommendation is ask fobuy yourself a Ledger for the Holidays, they're 63£ currently manufacturer direct 70£ on Amazon UK or 50$ on Amazon US. You can even get it at a discount of 15%+ if you use Purse.io and pay in BTC. I've done all my holiday shopping this way and it's worked beautifully. I suppose you could also spend your gifted Amazon gift cards for quick and easy BTC at a premium, but I digress. Remember to get a USB to microUSB/USB-C adapter if you want to use it with your phone.
Setup your Ledger, know how to store your seed phrase and ask if you don't, then once your funds have cleared send a test payment of 5 fiat units from the exchange to your ledger. You should generally avoid typing the address by hand, always copy/paste or even better use the exchange/wallet's app to scan the QR code on your computer screen. Once that transfer comes through consider entering the wrong pin three times on the Ledger to wipe it. Why? Well, here's the things that can go wrong and how to fix them. These are basic crypto skills for managing your money that every crypto user needs to practice at least once, if for no other reason than to decrease fear and increase user confidence in their ability to manage their crypto themselves.
By all means use your own ingenuity, but I would recommend replicating 1) Lost Pin, 2) Lost/Stolen/Damaged device, 3) Lost recovery seed phrase. 1 or 2 in combination with 3 is fatal.
Fairly straightforward, first we'll pretend we've derped out and entered the wrong pin three times then follow the instructions to recover the device using your seed phrase.
Second we pretend we've lost our device on the train or somesuch and need to use our seed phrase to import our keys to a temporary wallet while we're waiting for a new hardware wallet. It's simple, get Mycelium on your phone and use your recovery phrase to import your keys: from fresh install select Restore Backup then 24 words, pretty self-explanatory from there.
See how easy that is to gain access to all your crypto again using those 24 words? Anyone who has those words can do the same, so you don't put it in a computer or snap a picture of it and upload it to the cloud or put it under your mousepad for safe keeping with the rest of your passwords (OK, almost nobody but my grandma does this, but I'm making a point m'kay?).
Now we'll pretend we did something really, profoundly, inconceivably stupid like put our seed into a text file on a computer that then crashed (you know, rather than writing it down on paper and checking it twice like Saint Nick) and now have to get our crypto off the device forthwith so we can ditch the old wallet and make a new wallet with a new recovery phrase that we'll treat right this time. From the previous two examples we can see how essential that seed phrase is and we've already entered it into our phone once so for optimal security and to test losing that seed phrase we're going to generate our final, for keeps, gen-u-ine wallet on our Ledger.
Wipe it by entering the wrong pin three times then follow these instructions to reinitialize the device. Essentially plug it in, start the app, and select Configure as New Device. Record your seed phrase correctly and keep it safe. Maybe put a second copy in another secure location. Heck, you can even store it in metal so it survives a housefire because reasons.
Finally, send any crypto from the wallet we're pretending we've lost the seed to in Mycelium to your new Ledger wallet. You can then follow these instructions to use Mycelium with your Ledger or other hardware wallet.
The basic principles involved in these exercises can be generally applied to any wallet. Most people probably wont actually spend an evening going through all this, and although I hope they do even if they don't hopefully after reading this there's a better awareness of how to manage holding your private keys and less fear when doing so.
submitted by FortuitousIdiom 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]

Paper Wallet support in bitcoin-core | Dan Libby | Sep 29 2017

Dan Libby on Sep 29 2017:
Hi,
I'm writing to suggest and discuss the addition of paper wallet
functionality in bitcoin-core software, starting with a single new RPC
call: genExternalAddress [type].
-- rationale --
bitcoin-core is the most trusted and most secure bitcoin implementation.
Yet today (unless I've missed something) paper wallet generation
requires use of third party software, or even a website such as
bitaddress.org. This requires placing trust in an additional body of
code from a less-trusted and less peer-reviewed source. Ideally, one
would personally audit this code for one's self, but in practice that
rarely happens.
In the case of a website generator, the code must be audited again each
time it is downloaded. I cannot in good faith recommend to anyone to
use such third party tools for wallet generation.
I would recommend for others to trust a paper wallet that uses
address(es) generated by bitcoin-core itself.
At least for me, this requirement to audit (or implicitly trust) a
secondary body of bitcoin code places an additional hurdle or
disincentive on the use of paper wallets, or indeed private keys
generated outside of bitcoin-core for any purpose.
Unfortunately, one cannot simply use getnewaddress, getaccountaddress,
or getrawchangeaddress for this purpose, because the associated private
keys are added to the bitcoin-core wallet and cannot be removed... or in
the case of hd-wallets are deterministically derived.
As such, I'm throwing out the following half-baked proposal as a
starting point for discussion:
genexternaladdress ( "type" ) Returns a new Bitcoin address and private key for receiving payments. This key/address is intended for external usage such as paper wallets and will not be used by internal wallet nor written to disk. Arguments: 1. "type" (string, optional) one of: p2pkh, p2sh-p2wpkh default: p2sh-p2wpkh Result: { "privKey" (string) The private key in wif format. "address" (string) The address in p2pkh or p2sh-p2wpkh format. } Examples: > bitcoin-cli genexternaladdress 
This API is simple to implement and use. It provides enough
functionality for any moderately skilled developer to create their own
paper wallet creation script using any scripting language, or even for
advanced users to perform using bitcoin-cli or debug console.
If consensus here is in favor of including such an API, I will be happy
to take a crack at implementing it and submitting a pull request.
If anyone has reasons why it is a BAD IDEA to include such an RPC call
in bitcoind, I'm curious to hear it.
Also, I welcome suggestions for a better name, or maybe there could be
some improvements to the param(s), such as calling p2sh-p2wpkh "segwit"
instead.
---- further work ----
Further steps could be taken in this direction, but are not necessary
for a useful first-step. In particular:
  1. an RPC call to generate an external HD wallet seed.
  2. an RPC call to generate N key/address pairs from a given seed.
  3. GUI functionality in bitcoin-qt to facilitate easy paper wallet
generation (and printing?) for end-users, complete with nice graphics,
qr codes, etc.
original: https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2017-Septembe015120.html
submitted by dev_list_bot to bitcoin_devlist [link] [comments]

A List of Coins People Find Suspicious | January Edition, 2014

Scamcoin/Shitcoin/Clonecoin/LameCoin's Game Plan review: 1) 2-3 months of pump and dump plan 2) fork litecoin/peerCoin/quarkcoin/bitcoin/nxt , copy-n-paste the codes or using coin generator 3) hype train 4) list on exchanges (not for adoptions but for dumping) 5) pump up the value using tiny amount and dump massive amount at the top 6) the coin became abandon coin, and those hold the coins became bagholders 7) dev(s) changed name, and the project, move on, rinse and repeat
Also, I wrote the scamcoins' signs a while ago, check out http://www.reddit.com/scamcoin/comments/1sa8vu/scam_scale_rating_auditing_proposal/
To see a taste of of the upcoming cesspools, check out http://coingen.io/status.html . Maybe you should screen-capture it to see what's coming out the other end. For backup purpose, here is the pastebin list for these shit/scamcoins http://pastebin.com/wTaY19Qx
Yes, there is a coin generator now. All readied for pump and dump.
For reference of new shitcoins/scamcoins/clonecoins, check out https://bitcointalk.org/index.php?board=159.0
AeroCoin
VisaCoin
Coinye http://www.reddit.com/coinyewest/comments/1uok4u/fair_launch_my_ass_this_coin_is_premined/ , also don't forget the sticky gem http://www.reddit.com/coinyewest/comments/1uoqph/read_this_before_crying_scam/
Lights- IPO of IPO, 7th gen https://bitcointalk.org/index.php?topic=404524.0
Neon- more IPO shit https://bitcointalk.org/index.php?topic=400356.0
DubstepCoin - relaunch https://bitcointalk.org/index.php?topic=395599.0
TopCoin - IPO shit https://bitcointalk.org/index.php?topic=404622.0
VeroCoin: next-gen "forging" and more IPO shit https://bitcointalk.org/index.php?topic=395758.0
webcoin: emptied talk and IPO shit
vCoin: https://bitcointalk.org/index.php?topic=395534.0
NutCoin: a sample quote "Nutcoin is not a copycoin, it was designed to have a real value based on the "real world" necessity to buy goods, services, food, coffee or nuts, hence the name." https://bitcointalk.org/index.php?topic=393572.0
KaiserCoin : It's our friend Max up to his no-good. Where's his buddy Bill? I thought they are not done with the Pump and Dump Quarkcoin. https://twitter.com/search?q=%23KeiserCoin&src=hash
NOXXO: already in its 9-generation. dude gonna do parallel programming for mining octa-core on Samsung Note. /sarcasm https://bitcointalk.org/index.php?topic=400670.0
ShareCoin : IPO shit https://bitcointalk.org/index.php?topic=399375.0
Atom: So much pre-mined it's not even funny https://bitcointalk.org/index.php?topic=380546.0
KarpCoin: they are running out of meme/animal/celebs and now it's pokemon https://bitcointalk.org/index.php?topic=400794.0
ShoeCoin: nothing to see. https://bitcointalk.org/index.php?topic=399279.0
RiceCoin: quote "the first commodity backed coin" uh huh. https://bitcointalk.org/index.php?topic=398709.0
GiftCoin: quote "We are going to launch a brand new coin unique to any other. " no, just no. admit that it's just plain Scrypt, don't cover it with lies. what i hate some coins the most is that they try to spin bullshit on plain Scrypt. also, ANY damn coin can be printed on a card using QR code to conver the public address. https://bitcointalk.org/index.php?topic=392465.0
LottoCoin -pump and dump
Fckbankscoin - aside from the douchy tittle, claimed to be the "word's first and only protest coin". failed
StackedCoin
PirateCoin
MonaCoin
MoonCoin
CuntCoin: death on arrival. Using Coingen. https://bitcointalk.org/index.php?topic=407952.0
CryptoStuds: instamine https://bitcointalk.org/index.php?topic=402464.0
LennyCoin https://bitcointalk.org/index.php?topic=401120.0
Turko https://bitcointalk.org/index.php?topic=409779.0
GrumpyCoin https://bitcointalk.org/index.php?topic=403936.0
LeproCoin huge premine. https://bitcointalk.org/index.php?topic=400393.0
Unicoin https://bitcointalk.org/index.php?topic=392204.0
AlienCoin https://bitcointalk.org/index.php?topic=392204.0
USDE https://bitcointalk.org/index.php?topic=410254.40
DigiByte https://bitcointalk.org/index.php?topic=408268.0
KushCoin https://bitcointalk.org/index.php?topic=411457.0
NyanCoin
Klondike Coin https://bitcointalk.org/index.php?topic=407705.0
Mr.T Coin more shitty idea https://bitcointalk.org/index.php?topic=411692.0. coingen
C-Notes https://bitcointalk.org/index.php?topic=397916.0
PesetaCoin https://bitcointalk.org/index.php?topic=403378.0
BatCoin https://bitcointalk.org/index.php?topic=400753.0
BitLand Lot of shits no actual codes. Asking for BTC https://bitcointalk.org/index.php?topic=398826.0
LiveCoin Coigen shit. https://bitcointalk.org/index.php?topic=406095.20
Cryptonium https://bitcointalk.org/index.php?topic=412037.0
TEXT more IPO shit for next-generation https://bitcointalk.org/index.php?topic=409655.0 . Seemed like all next-generation coins are e-begging.
BiddleBabbleBoo Coin https://bitcointalk.org/index.php?topic=379471.20
** One Coin**
To be updated.
December 2013 Edition
1) Africoin discussion: http://www.reddit.com/scamcoin/comments/1rwetv/africoin/ assessment: http://www.reddit.com/scamcoin/comments/1s40s2/assessment_of_africoin/
2) Quarkcoin discussion: http://www.reddit.com/scamcoin/comments/1rvp62/any_opinions_on_quarkcoin/) /quarkcoin
Reason: 98% or more already mined or pre-mined. 245,673,985 already in circulation since July 21, 2013 based on www.coinmarketcap.com. Great for pump and dump. On bitcointalk's release page discussion: "Total of 247 million QRK will be mined in ~ 6 months, after that ~ 1 million QRK p.a. (~ 0.5% p.a inflation)"
Auditing reveals:30.26% of all Quarks owned by 27 wallets. Source: http://quark.freeforums.net/thread/368/auditing-block-chain https://bitcointalk.org/index.php?topic=260031.0
Regarding Quarkcoin's development team:http://www.reddit.com/Bitcoin/comments/1su2aj/the_scam_behind_quarkcoin/ce1efux
3) Novacoin discussion: http://www.reddit.com/scamcoin/comments/1ru8ru/novacoin/
Reason: pre-mined /novacoin
Total shares: 504,839 NVC, price at $21.48 a share ! . Rumors has it the creators mined most of the coin and hold about 90% shares.
From here, https://bitcointalk.org/index.php?topic=144047.0 check out this line "There have been claims that over 200.000 coins were premined by the developer. The developer has claimed that only 60.000 coins have been premined but apparently BTC-e admitted that they got 100.000 coins to accept this currency on their exchange"
4) Ripple /ripplers
Reasons: tokens/money without mining, centralized system. It goes against the ideas of most crypto currencies stood for.
Source:http://ripplescam.org/ http://www.reddit.com/Bitcoin/comments/1ezeil/exposing_the_ripple_scam/ http://bitcoin.stackexchange.com/questions/11172/is-ripple-a-scam
5) Megacoin /megacoin 28% or more than 1/4 of total current shares are pre-mined Discussion : http://www.reddit.com/scamcoin/comments/1s62ao/megacoin/
6)Protoshares
7) Orbitcoin
8) LotteryTickets
9) Mastercoin pre-sale period of 5,120.6 BTC. blockhain address http://blockchain.info/address/1EXoDusjGwvnjZUyKkxZ4UHEf77z6A5S4P /mastercoin (discussion: http://www.reddit.com/scamcoin/comments/1rue87/mastercoin/ )
10) HobboNickels
11)Infinitecoin /infinitecoin
12)BitcoinScrypt http://bitcoinscrypt.org/
13)Q-coin : proposal phase http://q-coin.org/
14)LightCoin : https://github.com/litecoinmessiah/lightcoin LiteCoin clone. Vague to-do list.
15) ScamCoin: no website, no launch day ready. Emptied promises.
16) Nxt Coin http://www.reddit.com/scamcoin/comments/1si4xi/nxt_coin_discussion/ , also http://www.reddit.com/scamcoin/comments/1tmaz6/nxt_what_justifies_this_price/
17) SexCoin: pumped up 1200% on debut on coinmarketcap and then being dumped
18) FlorinCoin: pumped and dump
19) BitBar
20)YaCoin: /yacoin extreme low difficulty for instamine, disproportionate coins holding of 35% total coins are held by 20 wallets http://www.reddit.com/scamcoin/comments/1swa3s/yacoin_scam/
21)EarthCoin pre-mined 270 million coins. discussion http://www.reddit.com/scamcoin/comments/1tf3ch/earthcoin/
22) Colossus Coin
23) StableCoin -- the coin that is unstable. Premining history. Dev disappeared a few months, promised mixing service, and while waiting for the update, larger holders dumped and flooded the market and tanked the price.
24)GoldCoin: pre-mining history. Got hardforked
25) CatCoin: one meme too many. broken launch. vanilla litecoin clone
26) InternetPeso: this is not even a coin, just QR code branded as tangible currency with user-generated value.
27)eMunnie: next generation scam has arrived
28)DimeCoin: pre-mined 8% of 460 billion coins Release page: https://bitcointalk.org/index.php?topic=382164.0;all
29) MoonCoin : pre-mining accusation. total circulation 384.4 billions, on release page denied premined but http://moonminers.org/ states "MoonCoin is a premined SCAM with over 500+ blocks premined since the start. Im sorry but this pool isnt going to mine it. The first block of mooncoin is at 1388427134 ( Mon, 30 Dec 2013 18:12:14 GMT ) , 30 minutes earlier than anyone got access to source and / or wallet."
30) VisaCoin: Barring legal threat from the real Visa company, It is pre-sale nearly 80BTC with outlandish claims and nonexistence source codes.
31) Ripple
32) Mastercoin
Edit: Got shills downvoted. It is still a sticky topic. Downvoting it is pointless.
submitted by etparle to scamcoin [link] [comments]

A List of Coins People Find Suspicious | January Edition, 2014

OP: http://www.reddit.com/scamcoin/comments/1up2q4/a_list_of_coins_people_find_suspicious_january/
Scamcoin/Shitcoin/Clonecoin/LameCoin's Game Plan review: 1) 2-3 months of pump and dump plan 2) fork litecoin/peerCoin/quarkcoin/bitcoin , copy-n-paste the codes or using coin generator 3) hype train 4) list on exchanges (not for adoptions but for dumping) 5) pump up the value using tiny amount and dump massive amount at the top 6) the coin became abandon coin, and those hold the coins became bagholders 7) dev(s) changed name, and the project, move on and repeat
Also, I wrote the scamcoins' signs a while ago, check out http://www.reddit.com/scamcoin/comments/1sa8vu/scam_scale_rating_auditing_proposal/
To see a taste of of the upcoming cesspools, check out http://coingen.io/status.html . Maybe you should screen-capture it to see what's coming out the other end. For backup purpose, here is the pastebin list for these shit/scamcoins http://pastebin.com/wTaY19Qx
Yes, there is a coin generator now. All readied for pump and dump.
For reference of new shitcoins/scamcoins/clonecoins, check out https://bitcointalk.org/index.php?board=159.0
AeroCoin
VisaCoin
Coinye http://www.reddit.com/coinyewest/comments/1uok4u/fair_launch_my_ass_this_coin_is_premined/ , also don't forget the sticky gem http://www.reddit.com/coinyewest/comments/1uoqph/read_this_before_crying_scam/
Lights- IPO of IPO, 7th gen https://bitcointalk.org/index.php?topic=404524.0
Neon- more IPO shit https://bitcointalk.org/index.php?topic=400356.0
DubstepCoin - relaunch https://bitcointalk.org/index.php?topic=395599.0
TopCoin - IPO shit https://bitcointalk.org/index.php?topic=404622.0
VeroCoin: next-gen "forging" and more IPO shit https://bitcointalk.org/index.php?topic=395758.0
webcoin: emptied talk and IPO shit
vCoin: https://bitcointalk.org/index.php?topic=395534.0
NutCoin: a sample quote "Nutcoin is not a copycoin, it was designed to have a real value based on the "real world" necessity to buy goods, services, food, coffee or nuts, hence the name." https://bitcointalk.org/index.php?topic=393572.0
KaiserCoin : It's our friend Max up to his no-good. Where's his buddy Bill? I thought they are not done with the Pump and Dump Quarkcoin. https://twitter.com/search?q=%23KeiserCoin&src=hash
NOXXO: already in its 9-generation. dude gonna do parallel programming for mining octa-core on Samsung Note. /sarcasm https://bitcointalk.org/index.php?topic=400670.0
ShareCoin : IPO shit https://bitcointalk.org/index.php?topic=399375.0
Atom: So much pre-mined it's not even funny https://bitcointalk.org/index.php?topic=380546.0
KarpCoin: they are running out of meme/animal/celebs and now it's pokemon https://bitcointalk.org/index.php?topic=400794.0
ShoeCoin: nothing to see. https://bitcointalk.org/index.php?topic=399279.0
RiceCoin: quote "the first commodity backed coin" uh huh. https://bitcointalk.org/index.php?topic=398709.0
GiftCoin: quote "We are going to launch a brand new coin unique to any other. " no, just no. admit that it's just plain Scrypt, don't cover it with lies. what i hate some coins the most is that they try to spin bullshit on plain Scrypt. also, ANY damn coin can be printed on a card using QR code to conver the public address. https://bitcointalk.org/index.php?topic=392465.0
LottoCoin -pump and dump
Fckbankscoin - aside from the douchy tittle, claimed to be the "word's first and only protest coin". failed
StackedCoin
PirateCoin
MonaCoin
MoonCoin
CuntCoin: death on arrival. Using Coingen. https://bitcointalk.org/index.php?topic=407952.0
CryptoStuds: instamine https://bitcointalk.org/index.php?topic=402464.0
LennyCoin https://bitcointalk.org/index.php?topic=401120.0
Turko https://bitcointalk.org/index.php?topic=409779.0
GrumpyCoin https://bitcointalk.org/index.php?topic=403936.0
LeproCoin huge premine. https://bitcointalk.org/index.php?topic=400393.0
Unicoin https://bitcointalk.org/index.php?topic=392204.0
AlienCoin https://bitcointalk.org/index.php?topic=392204.0
USDE https://bitcointalk.org/index.php?topic=410254.40
DigiByte https://bitcointalk.org/index.php?topic=408268.0
KushCoin https://bitcointalk.org/index.php?topic=411457.0
NyanCoin
To be updated.
December 2013 Edition http://www.reddit.com/scamcoin/comments/1ts6bf/a_list_of_coins_people_find_suspicious_welcome_to/
Edit: Got shills downvoted. It is still a sticky topic. Downvoting it is pointless.
submitted by Coinality to CoinFraud [link] [comments]

online bitcoin generator qr code free - YouTube How to Accept Bitcoin by Printing QR Code - YouTube Bitcoin Code Test und Erfahrungen - YouTube Bitcoin-Transferencia de bitcoin por código Qr de ... How To Access The Users Webcam To Scan Bitcoin QR Codes

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