How to Transfer Funds if Get “Insufficient Funds” Error in ...

My attempt at an ELI5 for cryptocurrency to help my friends.

This is a long one so fair warning and no there is no tl;dr. I've only been at this for about 6 months and worked up this paper the other day for my friends who are interested but know very little about this. Hopefully whoever reads this can make in corrections as I am far from an expert.
Cryptocurrency, Bitcoin, Ether are all blockchains. Blockchains are basically a spreadsheet (LEDGER) that is duplicated multiple times across a network and updated regularly simultaneously. There is no centralized version of this ledger. It is hosted simultaneously by thousands/millions of computers. These ledgers will update on their own, Bitcoin as an example automatically checks itself every 10 minutes. Each of these 10-minute increment of transactions (in bitcoins case transactions would be sending or receiving bitcoins from one person to another for goods or services) are called BLOCKS. For these blocks to be confirmed, accepted, and updated to the ledger nodes are required.
Nodes (Mining/Forging)
A node is a computer running the blockchain software on the network. The blockchain software will automatically download the entire ledger of all transactions since its inception. At regular intervals, the software will take the transactions of a block (data on the ledger) and convert them into a mathematical puzzle to be solved by randomly chosen nodes (MINING). Mining requires powerful processors (typically GPUs) and substantial quantities of energy to receive mined tokens profitably. When a specific number of nodes solve the puzzle with the same answer they are basically confirming that the data on the block is accurate as multiple independent nodes found the same answer. When confirmed, the block gets added to the previous blocks making a chain of blocks aka a blockchain. As an incentive to run your computer as a node you are rewarded with TOKENS. If a single person or group of people wanted to manipulate the ledger, the amount of machinery and electricity used to achieve the majority of miners thus allowing you to manipulate the ledger is so exponentially expensive that it serves no reasonable purpose. This is an example of a Proof of Work Blockchain System (computer solves puzzle and rewarded with tokens)
Tokens are part of the core of the blockchain. They are an incentive to validate transactions and create blocks. They gain intrinsic value based on the blockchain they are associated with. Some blockchains grant token holder’s different abilities. With Bitcoin, tokens are needed to pay for transaction fees. Others allow voting rights on how certain blockchain functions are managed. There is a limited amount of Bitcoin that will ever be released to nodes (21 million expected to be all be released by 2033) which also keep inflation from being a problem. Blockchains can create their platform with whatever number of tokens they would like and release them or create means to mine them as they see fit. Essentially, as with any other fiat money (currency that a government has declared to be legal tender NOT backed by a physical commodity), as adoption and trust increases the value of the token will increase. If most people accept Bitcoin for services and stores accept Bitcoin for goods than it is as good as the next currency.
Whether you mine for tokens, are paid in tokens for goods or services or purchase tokens from a person or currency exchange you need a place to store them securely and a way to send and receive them. Cryptocurrency Wallets don’t store currency, they hold your public and private keys that interface with the blockchain so you can access your balance, send money and manage your funds. The public key allows others to send money to the public key only. A wallet that is "offline" (see Hardware or Paper below) cannot access funds or send money unless it is accessed with another form of wallet, either desktop, online, or mobile.
1) Desktop Wallet - Installed on your computer and are only accessible from that SINGLE computer. Very secure but if someone hacks your computer you are exposed. 2) Online Wallet - Run remotely (cloud based) and are far more convenient to access but make them more vulnerable as they are controlled by a third party and are also vulnerable to hacking attacks. Exchange wallets are online wallets but you are not in control of the private key. View it as a wallet that is lended to you so you can trade. The wallet is technically not yours. 3) Mobile - Ran on an app and are useful as they can be used anywhere including retail stores 4) Hardware - Private keys are stored on a tangible device like a USB drive. They can make transactions online but they are stored offline. Compatible with web interfaces and support many but not all currencies. To use, plug into a computer, enter a pin, send currency and confirm. Safest form of storage. 5) Paper - Basically a physical printout of your private and public keys. It is not stored online anywhere and the only way transactions can happen is if you transfer money with the help of an Online wallet.
Example of a Public Key = 1A684DbsHQKPVCWgaUsYdF4uQGwTiA9BFT Example of a Private Key = E9873D79C6D87DC0FB6A5778633389F4453213303DA61F20BD67FC233AA33262
Most wallets provide a Recovery Mnemonic Passcode that is a series of words (typically 12 to 24 words) in a specific order. If you lose your login information for your wallet you can supply the mnemonic passcode and retrieve your lost login information. If you lose your login information and your mnemonic passcode your wallet will be inaccessible and your tokens are lost to you. The above basically describes a first generation Blockchain Cryptocurrency such as Bitcoin. It is used basically as currency with no centralized entity regulating the release of additional currency and keeping the ledger of where the money is going secure and extremely safe from manipulation.
Second Generation Blockchain
The second generation blockchains sprung out of this environment with something more valuable. Utilizing the blockchain system to allow applications to be ran on top of a decentralized secure system. Instead of just recording transactions, contracts could be transmitted the same way. More complex transactions (SMART CONTRACTS) allow for things such as: - Funds to be spent only when a required percentage of people agree - Manage agreements between users (such as insurance) - Provide utility to other contracts - Store information about an application such as domain registration information or membership records This basically can allow applications to be ran on top of the blockchain system. This can cut out the middleman for many real-world applications (mortgages, banking, communications, security confirmations etc.)
Proof of Work/Proof of Stake
As I mentioned earlier, Proof of Work (PoW) requires nodes to solve a mathematical puzzle which is rewarded with tokens. Proof of Stake (PoS) is different, the tokens with proof of stake systems are pre-mined meaning they are all created when the blockchain system is created. Blocks are not verified by the typical method. The block validator uses the blockchain software to stake their tokens and are chosen based on specific factors depending on how many tokens the person holds and for how long. Depending on how many tokens they hold will restrict the quantity of blocks they can validate. If they own more they can validate more often but all validators will be chosen randomly keeping the rewards fairly distributed (unlike PoW which typically reward the first completed.) The blockchain still requires a mathematical puzzle to be solved but it is much easier than PoW requiring far less time and energy. If the blockchain has premined all of their tokens then new tokens cannot be mined for rewards in PoS. The reward for staking your tokens to be a validator is a portion of the transaction fee that is charged as part of normal transactions on the blockchain. That is why PoS miners are called forgers. If manipulation is attempted than their stake can be taken from their wallet adding more motivation to prevent data manipulation.
Some cryptocurrencies may need to update or upgrade the coding of their blockchain software. When this happens usually a fork occurs. This basically means the cryptocurrency splits into two separate cryptocurrencies. Because the nature of blockchain technology, they are decentralized and autonomous so the older version cannot be deleted or removed. If people choose to continue using the old version they can. For mining/forging purposes the nodes will need to choose which they will mine/forge and download the blockchain software on their computer to proceed. When the fork occurs, anyone holding tokens in the original currency will be given the same number of tokens in the forked currency. (When Bitcoin forked to Bitcoin Cash, anyone holding x amount of Bitcoin would receive a new wallet for Bitcoin Cash also containing x amount of Bitcoin Cash.) This is called a Hard Fork and all previous transactions are made invalid. There are also Soft Forks, in this case it is backwards compatible and all previous transactions are valid. This can result in two currencies but in most cases, it doesn’t as it is usually accepted by most miners/forgers because it is backwards compatible.
Online currency exchanges allow you to buy, sell or exchange fiat money (USD, EUR, etc) with digital currencies or in most cases digital currencies for other digital currencies. There are a large variety of different exchanges that are operated in multiple countries but there are around a dozen that the majority of cryptocurrency trading volume are present on. Not all cryptocurrencies will be listed on all exchanges, some have specific prerequisites to be listed on their exchange and there may be fees associated as well. Once your account is set up you will have a list of all available cryptocurrencies to trade. Each currency will have an associated online wallet with the public key address allowing you to send that specific currency to that wallet. (Many exchanges are having delayed or canceled identity verification, currency transfers and lack sufficient customer support due to the influx of new traders) Examples of top exchanges: 1) Coinbase (trades fiat) 2) GDAX (trades fiat) 3) Gemini (trades fiat) 4) Changelly (trades fiat) 5) Bittrex 6) Binance 7) HitBTC 8) EtherDelta 9) Bitfinex 10) Kraken 11) Bithumb 12) Bitstamp 13) Poloniex 14) OKEx
Sending/Receiving Tokens
All wallets have the ability to send digital currency to other wallets. The function is relatively easy, make sure the currency you are sending is going to the appropriate wallet for that currency. Ethereum tokens cannot be sent to a Bitcoin wallet for example. (The tokens aren’t actually moving location; the list of transactions/ownership is what is stored in the wallet). Triple check the wallet private key you are sending the tokens to. If you type the wrong address the tokens will be lost in nearly all incidents. Some mobile wallets allow you to scan a QR code that will automatically enter the public key rather than copying/pasting or typing out the public key.
As of January 1, 2018 it appears that taxing on digital currency has changed. Every trade between any digital currencies (Bitcoin to Ether, Ether to Litecoin etc) will be a taxable transaction. If you hold the currency for longer than one year than you will pay capital gain tax when it is traded or sold (15%-20%) and if you sell or trade in less than a year you will have to add the profit to your taxable income to adjust your tax bracket.
Altcoins are basically any coin that is not Bitcoin. Most cryptocurrencies do not have a native blockchain (their own independent dedicated blockchain). Bitcoin, Ether, Ripple, Waves, NXT, Cardano all have their own native blockchain. Many other cryptocurrencies run on other cryptocurrency’s blockchains. Litecoin runs on Bitcoins blockchain, hundreds run on the Ethereum blockchain. These currencies act as smart contracts running on the adopted blockchain.
DApps (Decentralized Applications)
For a blockchain application to be considered a DApp it must be 1) Open source, code available to all 2) Decentralized, uses blockchain cryptographic tech 3) Incentive, must have tokens to fuel itself 4) Algorithm/Protocol, generates tokens and has a built-in consensus mechanism (mining/forging.)
There are 3 types of DApps, each basically piggybacks off the platform of the previous Type 1 – Have their own blockchain (like bitcoin) Type 2 – Use the blockchain of Type 1 DApps Type 3 – Use the protocol of Type 2 DApps
ICO (Initial Coin Offering)
Much like an IPO (Initial Public Offering) that offers stock in a private company to the public, an ICO raises money for new Cryptocurrency ventures. Typically, a minimum investment is required in the form of a cryptocurrency such as Bitcoin or Ether and the investor is given tokens of the cryptocurrency at a reduced cost. Due to the fact that ICO’s are so new, government agencies have not begun regulating these ventures making them extremely risky as anyone with a competent coder can create and market a cryptocurrency that can be used to swindle investors who aren’t cautious. The US government no longer allows its citizens to participate in ICO’s and if you are using a computer with an IP address located in the United States, ICO’s websites will not allow you to invest.
1) Whitepapers – Each cryptocurrency will have their own dedicated websites and most will have a whitepaper that has a description of what their cryptocurrency is designed to do. 2) Roadmaps – Also on each cryptocurrency’s website, they tend to have a roadmap or timeline as to when they are planning to complete certain milestones be it added features to the blockchain or wallet or any other important events. 3) – List of every available cryptocurrency, the exchanges they trade on, market cap, trade volume, available tokens, newly created tokens etc. 4) (cryptocurrency subreddit) – Subreddits focused on cryptocurrency as well as specific subreddits focused on individual cryptocurrencies. Be cautious as many people on these sites are uninformed and/or are trying to manipulate the market by fooling others to buy or sell based on fraudulent information. 5) – Forums specific to individual cryptocurrencies. There is a lot of self-marketing (bounties) on this site. Take what they say with a grain of salt 6) TwitteFacebook (Social Media) – Many times news from team members or the cryptocurrency’s social media page will break news before it is listed on any of the above-mentioned outlets. Find out who is working for the cryptocurrency you are interested in and start following the team’s social media. Don’t forget to look at their linkedin accounts if available, previous employment and behavioral history to confirm they are competent. 7) Github - Code from projects can be uploaded here and reviewed for issues and revisions.
Common Terms/Slang
Shilling – covert advertising, personally endorsing a token so as to manipulate the price to either recoup a loss or increase gains on a token the individual owns. FUD – Fear, Uncertainty, Doubt; another method to manipulate the price of a token the person owns by making others second guess their investment decision on a specific token. FOMO – Fear Of Missing Out; buying a token (usually after the price has already increased) hoping they haven’t missed the majority of a price increase. Shitcoin – A cryptocurrency that has become worthless overtime or a scam operation. To the Moon – Massive increase in a token’s price.
I'm sure there are probably revisions to be done on this as I am still getting my head around all of the concepts. Any help to this would be appreciated.
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Blockchain Wallets

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What a Blockchain Wallet is? What is its purpose?
Find the answer after reading this article.
Public/Private Key
The public key is the digital code you give to someone that wants to transfer ownership of a unit of cryptocurrency to you; and a private key is what you need to be able to unlock your own wallet to transfer a unit of a cryptocurrency to someone else. The encoding of information within a wallet is done by the private and public keys. That is the main component of the encryption that maintains the security of the wallet. Both keys function in simultaneous encryption systems called symmetric and asymmetric encryption. The former, alternatively known as private key encryption, makes use of the same key for encryption and decryption. The latter, asymmetric encryption, utilizes two keys, the public and private key, wherein a message-sender encrypts the message with the public key, and the recipient decodes it with their private key. The public key uses asymmetric algorithms that convert messages into an unreadable format. A person who possesses a public key can encrypt the message for a specific receiver.
Accessing wallets
Methods of wallet access vary depending on the type of wallet being used. Various types of currency wallets on an exchange will normally be accessed via the exchange’s entrance portal, normally involving a combination of a username/password and optionally, 2FA (Two factor authentication, which we explain in more detail later). Whereas hardware wallets need to be connected to an internet enabled device, and then have a pin code entered manually by the user in possession of the hardware wallet in order for access to be gained. Phone wallets are accessed through the device on which the wallet application has been downloaded. Ordinarily, a passcode and/or security pattern must be entered before entry is granted, in addition to 2FA for withdrawals.
Satoshi Nakamoto built the Satoshi client which evolved into Bitcoin in 2009. This software allowed users to create wallets and send money to other addresses. However, it proved to be a nightmarish user experience, with many transactions being sent to incorrect addresses and private keys being lost. The MtGox (Magic the Gathering Online exchange, named after the original intended use of the exchange) incident, which will be covered in greater detail later, serves as a reminder of the dangers present in the cryptosphere regarding security, and the need to constantly upgrade your defenses against all potential hacks. The resulting loss of 850k BTC is a still unresolved problem, weighing heavily on the victims and the markets at large. This caused a huge push for a constantly evolving and improving focus on security. Exchanges that developed later, and are thus considered more legitimate and secure, such as Gemini and Coinbase, put a much greater emphasis on vigilance as a direct result of the MtGox hacking incident. We also saw the evolution of wallet security into the physical realm with the creation of hardware wallets, most notable among them the Ledger and Trezor wallets.
Types of Wallets & Storage Methods
The simplest way to sift through the dozens of cryptocurrency storage methods available today, is to divide them up into digital and non-digital, software and hardware wallets. There are also less commonly used methods of storage of private keys, like paper wallets and brain wallets. We will examine them all at least briefly, because in the course of your interaction with cryptocurrencies and Blockchain technology, it is essential to master all the different types of hardware and software wallets. Another distinction must be made between hot wallets and cold wallets. A hot wallet is one that is connected to the internet, and a cold wallet is one that is not. Fun fact: The level below cold storage, deep cold storage has just recently been implemented by the Regal RA DMCC, a subsidiary of an internationally renowned gold trading company licensed in the Middle East. After having been granted a crypto trading license, Regal RA launched their “deep cold” storage solution for traders and investors, which offers the ability to store crypto assets in vaults deep below the Almas Tower in Dubai. This storage method is so secure that at no point is the vault connected to a network or the internet; meaning the owners of the assets can be sure that the private keys are known only to the rightful owners.
Lets take a quick look at specific features and functionality of varieties of crypto wallets. Software wallets: wallet applications installed on a laptop, desktop, phone or tablet. Web Wallets: A hot wallet by definition. Web Wallets are accessible through the web browser on your phone or computer. The most important feature to recognize about any kind of web wallet, is that the private keys are held and managed by a trusted third party. MyEtherWallet is the most commonly used non-exchange web wallet, but it can only be used to store Ethereum and ERC-20 tokens.
Though the avenue of access to MEW is through the web, it is not strictly speaking a web wallet, though this label will suffice for the time being. The MEW site gives you the ability to create a new wallet so you can store your ETH yourself. All the data is created and stored on your CPU rather than their servers. This makes MEW a hybrid kind of web wallet and desktop wallet. Exchange Wallets: A form of Web Wallet contained within an exchange. An exchange will hold a wallet for each individual variety of cryptocurrency you hold on that exchange. Desktop Wallets: A software program downloaded onto your computer or tablet hard drive that usually holds only one kind of cryptocurrency. The Nano Wallet (Formerly Raiwallet) and Neon wallet for storage of NEO and NEP-5 tokens are notable examples of desktop wallets Phone Wallets: These are apps downloaded onto a mobile phone that function in the same manner as a desktop wallet, but actually can hold many different kinds of cryptocurrency. The Eidoo Wallet for storing Ethereum and its associated tokens and Blockchain Wallet which currently is configured to hold BTC, ETH and Bitcoin Cash, are some of the most widely used examples.
Hardware wallets — LedgeTrezoAlternatives
Hardware wallets are basically physical pathways and keys to the unique location of your crypto assets on the Blockchain. These are thought to be more secure than any variety of web wallet because the private key is stored within your own hard wallet, an actual physical device. This forcibly removes the risk your online wallet, or your exchange counter party, might be hacked in the same manner as MtGox. In hardware wallet transactions, the wallet’s API creates the transaction when a user requests a payment. An API is a set of functions that facilitates the creation of applications that interact and access features or data of an operating system. The hardware then signs the transaction, and produces a public key, which is given to the network. This means the signing keys never leave the hardware wallet. The user must both enter a personal identification number and physically press buttons on the hardware wallet in order to gain access to their Blockchain wallet address through this method, and do the same to initiate transfers.
Paper Wallets
Possibly the safest form of cryptocurrency storage in terms of avoiding hacking, Paper Wallets are an offline form of crypto storage that is free to set up, and probably the most secure way for users, from beginners to experts, to hold on to their crypto assets. To say it simply, paper wallets are an offline cold storage method of storing cryptocurrency. This includes actually printing out your public and private keys on a piece of paper, which you then store and save in a secure place. The keys are printed in the form of QR codes which you can scan in the future for all your transactions. The reason why it is so safe is that it gives complete control to you, the user. You do not need to worry about the security or condition of a piece of hardware, nor do you have to worry about hackers on the net, or any other piece of malware. You just need to take care of one piece of paper!
Real World Historical Examples of Different Wallet Types
Web Wallet: Brief mechanism & Security is both a cryptocurrency wallet, supporting Bitcoin, Ethereum and Bitcoin cash, and also a block explorer service. The wallet service provided by has both a Web Wallet, and mobile phone application wallet, both of which involve signing up with an email address, and both have downloadable private keys. Two Factor Authentication is enabled for transfers from the web and mobile wallets, as well as email confirmation (as with most withdrawals from exchanges). Phone Wallet: Eidoo The Eidoo wallet is a multi-currency mobile phone app wallet for storage of Ethereum and ERC-20 tokens. The security level is the standard phone wallet level of email registration, confirmation, password login, and 2 factor authentication used in all transfers out. You may find small volumes of different varieties of cryptocurrencies randomly turning up in your Eidoo wallet address. Certain projects have deals with individual wallets to allow for “airdrops” to take place of a particular token into the wallet, without the consent of the wallet holder. There is no need to be alarmed, and the security of the wallet is not in any way compromised by these airdrops.
Neon Wallet
The NEON wallet sets the standard for web wallets in terms of security and user-friendly functionality. This wallet is only designed for storing NEO, Gas, and NEP-5 tokens (Ontology, Deep Brain Chain, RPX etc.). As with all single-currency wallets, be forewarned, if you send the wrong cryptocurrency type to a wallet for which it is not designed, you will probably lose your tokens or coins. MyEtherWallet My Ether Wallet, often referred to as MEW, is the most widely used and highly regarded wallet for Ethereum and its related ERC-20 tokens. You can access your MEW account with a hardware wallet, or a different program. Or you can also get access by typing or copying in your private key. However, you should understand this method is the least safe way possible,and therefore is the most likely to result in a hack. Hardware: TrezoLedger Brief History Mechanism and Security A hardware wallet is a physical key to your on-chain wallet location, with the private keys contained within a secure sector of the device. Your private key never leaves your hardware wallet. This is one of the safest possible methods of access to your crypto assets. Many people feel like the hardware wallet strikes the right balance between security, peace of mind, and convenience. Paper Wallet Paper wallets can be generated at various websites, such as and They enable wallet holders to store their private keys totally offline, in as secure a manner as is possible.
Real World Example — Poor Practices
MtGox Hack history effects and security considerations MtGox was the largest cryptocurrency exchange in the world before it was hacked in 2014. They were handling over 70% of BTC transactions before they were forced to liquidate their business. The biggest theft of cryptocurrency in history began when the private keys for the hot wallets were stolen in 2011 from a wallet.dat file, possibly by hacking, possibly by a rogue employee. Over the course of the next 3 years the hot wallets were emptied of approximately 650000 BTC. The hacker only needed wallet.dat file to access and make transfers from the hot wallet, as wallet encryption was only in operation from the time of the Bitcoin 0.4.0 release on Sept 23rd 2011. Even as the wallets were being emptied, the employees at Mt Gox were apparently oblivious to what was taking place. It seems that Mt Gox workers were interpreting these withdrawals as large transfers being made to more secure wallets. The former CEO of the exchange, Mark Karpeles, is currently on trial for embezzlement and faces up to 5 years in prison if found guilty. The Mt Gox hack precipitated the acceleration of security improvements on other exchanges, for wallets, and the architecture of bitcoin itself. As a rule of thumb, no small-to-medium scale crypto holders should use exchange wallets as a long-term storage solution. Investors and experienced traders may do this to take advantage of market fluctuations, but exchange wallets are perhaps the most prone to hacking, and storing assets on exchanges for an extended time is one of the riskiest ways to hold your assets.
In a case strikingly similar to the MtGox of 2011–2014, the operators of the BitGrail exchange “discovered” that approximately 17 million XRB ($195 million worth in early 2018) were missing. The operators of the exchange were inexplicably still accepting deposits, long after they knew about the hack. Then they proceeded to block withdrawals from non-EU users. And then they even requested a hard fork of the code to restore the funds. This would have meant the entire XRB Blockchain would have had to accept all transactions from their first “invalid” transaction that were invalid, and rollback the ledger. The BitGrailexchange attempted to open operations in May 2018 but was immediately forced to close by order of the Italian courts. BitGrail did not institute mandatory KYC (Know your customer) procedures for their clients until after the theft had been reported, and allegedly months after the hack was visible. They also did not have 2 factor authentication mandatory for withdrawals. All big, and very costly mistakes.
Case Study: Good Practice Binance, the Attempted Hack
During the 2017 bull run, China-based exchange Binance quickly rose to the status of biggest altcoin exchange in the world, boasting daily volumes that surged to over $4 billion per day in late December. Unfortunately, this success attracted the attention of some crafty hackers. These hackers purchased domain names that were confusingly similar to “”. And then they created sufficiently convincing replica websites so they could phish traders for their login information. After obtaining this vital info, the scammers created API keys to place large buy orders for VIAcoin, an obscure, low volume digital currency. Those large buy orders spiked VIA’s price. Within minutes they traded the artificially high-priced VIA for BTC. Then they immediately made withdrawal requests from the hacked BTC wallets to wallets outside of the exchange. Almost a perfect fait accompli! But, Binance’s “automating risk management system” kicked in, as it should, and all withdrawals were temporarily suspended, resulting in a foiled hacking attempt.
Software Wallets Web/Desktop/Phone/Exchange Advantages and Limitations
As we said before, it is inadvisable to store crypto assets in exchange wallets, and, to a lesser extent, Web Wallets. The specific reason we say that is because you need to deliver your private keys into the hands of another party, and rely on that website or exchange to keep your private key, and thus your assets, safe. The advantages of the less-secure exchange or web wallets, are the speed at which you can transfer assets into another currency, or into another exchange for sale or for arbitrage purposes. Despite the convenience factor, all software wallets will at some point have been connected to the internet or a network. So, you can never be 100% sure that your system has not been infected with malware, or some kind of keylogging software, that will allow a third party to record your passwords or private keys. How well the type of storage method limits your contact with such hazards is a good way to rate the security of said variety of wallet. Of all the software wallets, desktop and mobile wallets are the most secure because you download and store your own private key, preferably on a different system. By taking the responsibility of private key storage you can be sure that only one person has possession of it, and that is you! Thereby greatly increasing the security of your crypto assets. By having their assets in a desktop wallet, traders can guard their private key and enjoy the associated heightened security levels, as well keep their assets just one swift transfer away from an exchange.
Hardware Wallets Advantages and Limitations
We briefly touched on the features and operation of the two most popular hardware wallets currently on the market, the Ledger and Trezor wallets. Now it will be helpful to take a closer look into the pros and cons of the hardware wallet storage method. With hardware wallets, the private keys are stored within a protected area of the microcontroller, and they are prevented from being exported out of the device in plain text. They are fortified with state-of-the-art cryptography that makes them immune to computer viruses and malware. And much of the time, the software is open source, which allows user validation of the entire performance of the device. The advantages of a hardware wallet over the perhaps more secure paper wallet method of crypto storage is the interactive user experience, and also the fact that the private key must at some stage be downloaded in order to use the paper wallet. The main disadvantage of a hardware wallet is the time-consuming extra steps needed to transfer funds out of this mode of storage to an exchange, which could conceivably result in some traders missing out on profits. But with security being the main concern of the vast majority of holders, investors and traders too, this slight drawback is largely inconsequential in most situations.
Paper Wallets Advantages and Limitations
Paper wallets are thought by some to be the safest way to store your crypto assets, or more specifically, the best method of guarding the pathways to your assets on the Blockchain. By printing out your private key information, the route to your assets on the Blockchain is stored 100% offline (apart from the act of printing the private key out, the entire process is totally offline). This means that you will not run the risk of being infected with malware or become the victim of keylogging scams. The main drawback of using paper wallets is that you are in effect putting all your eggs in one basket, and if the physical document is destroyed, you will lose access to your crypto assets forever.
Key things to keep in mind about your Wallet Security: Recovery Phrases/Private Key Storage/2FA/Email Security
Recovery phrases are used to recover the on-chain location for your wallet with your assets for hardware wallets like ledgers and Trezors that have been lost. When you purchase a new ledger for example, you just have to set it up again by entering the recovery phrase into the display and the lost wallets will appear with your assets intact. Private key storage is of paramount importance to maintain the safety of your on-chain assets! This should be done in paper wallet form, or stored offline on a different computer, or USB device, from the one you would typically use to connect to the 2 Factor Authentication (2FA) sometimes known as “two step authentication”. This feature offers an extra security layer when withdrawing funds from cryptocurrency wallets. A specialized app, most commonly Google Authenticator, is synced up to the exchange to provide a constantly changing code. This code must be entered within a short time window to initiate transfers, or to log into an exchange, if it has also been enabled for that purpose.
You must always consider the level of fees, or the amount of Gas, that will be needed to carry out the transaction. In times of high network activity Gas prices can be quite high. In fact, in December 2017 network fees became so high that some Bitcoin transactions became absolutely unfeasible. But that was basically due to the anomalous network congestion caused by frantic trading of Bitcoin as it was skyrocketing in value. When copying wallet addresses, double check and triple check that they are correct. If you make a mistake and enter an incorrect address, it is most likely your funds will be irretrievably lost; you will never see those particular assets again. Also check that you haven’t input the address of another one of your wallets that is designed to hold a different variety of cryptocurrency. You would similarly run the very great risk of losing your funds forever. Or, at the very least, if you have sent the wrong crypto to a large exchange wallet, for example on Coinbase, maybe you could eventually get those funds back, but it would still entail a long and unenjoyable wait.
How to Monitor Funds
There are two ways to monitor you funds and your wallets. The first is by searching for individual wallet addresses on websites specifically designed to let you view all the transactions on a particular Blockchain. The other is to store a copy of your wallet contents on an application that tracks the prices of all cryptocurrencies. is the block explorer for Bitcoin, and it allows you to track all wallet movements so you can view your holdings and all the historical transactions within the wallet. The Ethereum blockchain’s block explorer is called Ether scanner, and it functions in the same way. There is a rival to Ether scanner produced by the Jibrel Network, called JSearch which will be released soon. JSearch will aim to offer a more streamlined and faster search method for Ethereum blockchain transactions. There are many different kinds of block explorer for each individual crypto currency, including for Nano (formerly Rai Blocks) and Neotracker for NEO. If you simply want to view the value of your portfolio, the Delta and Blockfolio apps allow you to easily do that. But they are not actually linked to your specific wallet address, they just show price movements and total value of the coins you want to monitor.
That’s not all! You can learn how to transfer and monitor the funds in and out of your wallet by clicking on the link.
To be continued!
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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, 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 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

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, 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 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](

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 ( 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 ( 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]

Is a central authority like a government required to ensure a transaction receiver received their purchase?

I know in the Bitcoin blockchain, receivership of Bitcoin (in whatever amount) is validated by the miners/cryptographic functions consensus, but that doesn't mean whatever was "purchased" by it (like an apple) can be validated to be received by the purchaser. I was speaking with someone today who mentioned that a central authority is required to insure that the purchaser receives the apple or receives a refund.
I honestly don't know how Bitcoin or any dApp (smart transaction) blockchain could validate that an apple or even any digital good was actually received by the "purchaser" (or even mailed/emailed to them), but it can record that at least an apple or digital good was bought. So the "trust" is then set on the receiver of the Bitcoin (or whatever coin) to provide the purchaser with the apple or digital good. I suppose if a digital string of characters is the purchased good, that could be in the purchaser's wallet and show that it was received, but I'm not sure that's something buyers would actually want (for privacy reasons).
I said that yes for physical items, no blockchain can prove an item was delivered (like say if USPS put shipping transactions on a blockchain, they could state in the transaction what was delivered, where, when, from who, and maybe even record a delivery signature, but that doesn't mean it was actually physically delivered), but that doesn't undermine the blockchain, as its trustless and the only trust that is expected or lost would be on the deliveresender of the apple. The record can't be changed, just a new record added correcting the previous record. He said blockchains aren't trustless, that we rely on the trust of the centralized nodes (I guess he meant the master nodes?), and that that's irrelevant anyways as they can't prove the apple was delivered.
So is he right that transactions using Bitcoin must rely on an outside centralized authority like Binance to ensure delivery of a purchased good? Or can blockchains be built in a way that at least ensures delivery of digital goods, even if they then would be publicly visible on the blockchain (or at least visible only to the wallet private key holder), or at least ensure a record of the delivery (like a picture)?
I don't think this argument invalidates the reason to have blockchain, but I certainly couldn't tell him it was better than any centralized authority he relies on, like the FDIC ensuring bank account (ironically of course banks and the government are both centralized).
submitted by kristoday to Bitcoin [link] [comments]

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