Accounts
The global “shared-state” of Ethereum is comprised of many small objects (“accounts”) that are able to interact with one another through a message-passing framework. Each account has a state associated with it and a 20-byte address. An address in Ethereum is a 160-bit identifier that is used to identify any account.
There are two types of accounts:
Externally owned accounts, which are controlled by private keys and have no code associated with them.
Contract accounts, which are controlled by their contract code and have code associated with them.
Image for post
Externally owned accounts vs. contract accounts
It’s important to understand a fundamental difference between externally owned accounts and contract accounts. An externally owned account can send messages to other externally owned accounts OR to other contract accounts by creating and signing a transaction using its private key. A message between two externally owned accounts is simply a value transfer. But a message from an externally owned account to a contract account activates the contract account’s code, allowing it to perform various actions (e.g. transfer tokens, write to internal storage, mint new tokens, perform some calculation, create new contracts, etc.).
Unlike externally owned accounts, contract accounts can’t initiate new transactions on their own. Instead, contract accounts can only fire transactions in response to other transactions they have received (from an externally owned account or from another contract account). We’ll learn more about contract-to-contract calls in the “Transactions and Messages” section.
Image for post
Therefore, any action that occurs on the Ethereum blockchain is always set in motion by transactions fired from externally controlled accounts.
Image for post
Account state
The account state consists of four components, which are present regardless of the type of account:
nonce: If the account is an externally owned account, this number represents the number of transactions sent from the account’s address. If the account is a contract account, the nonce is the number of contracts created by the account.
balance: The number of Wei owned by this address. There are 1e+18 Wei per Ether.
storageRoot: A hash of the root node of a Merkle Patricia tree (we’ll explain Merkle trees later on). This tree encodes the hash of the storage contents of this account, and is empty by default.
codeHash: The hash of the EVM (Ethereum Virtual Machine — more on this later) code of this account. For contract accounts, this is the code that gets hashed and stored as the codeHash. For externally owned accounts, the codeHash field is the hash of the empty string.
Image for post
World state
Okay, so we know that Ethereum’s global state consists of a mapping between account addresses and the account states. This mapping is stored in a data structure known as a Merkle Patricia tree.
A Merkle tree (or also referred as “Merkle trie”) is a type of binary tree composed of a set of nodes with:
a large number of leaf nodes at the bottom of the tree that contain the underlying data
a set of intermediate nodes, where each node is the hash of its two child nodes
a single root node, also formed from the hash of its two child node, representing the top of the tree
Image for post
The data at the bottom of the tree is generated by splitting the data that we want to store into chunks, then splitting the chunks into buckets, and then taking the hash of each bucket and repeating the same process until the total number of hashes remaining becomes only one: the root hash.
Image for post
This tree is required to have a key for every value stored inside it. Beginning from the root node of the tree, the key should tell you which child node to follow to get to the corresponding value, which is stored in the leaf nodes. In Ethereum’s case, the key/value mapping for the state tree is between addresses and their associated accounts, including the balance, nonce, codeHash, and storageRoot for each account (where the storageRoot is itself a tree).
Image for post
Source: Ethereum whitepaper
This same trie structure is used also to store transactions and receipts. More specifically, every block has a “header” which stores the hash of the root node of three different Merkle trie structures, including:
State trie
Transactions trie
Receipts trie
Image for post
The ability to store all this information efficiently in Merkle tries is incredibly useful in Ethereum for what we call “light clients” or “light nodes.” Remember that a blockchain is maintained by a bunch of nodes. Broadly speaking, there are two types of nodes: full nodes and light nodes.
A full archive node synchronizes the blockchain by downloading the full chain, from the genesis block to the current head block, executing all of the transactions contained within. Typically, miners store the full archive node, because they are required to do so for the mining process. It is also possible to download a full node without executing every transaction. Regardless, any full node contains the entire chain.
But unless a node needs to execute every transaction or easily query historical data, there’s really no need to store the entire chain. This is where the concept of a light node comes in. Instead of downloading and storing the full chain and executing all of the transactions, light nodes download only the chain of headers, from the genesis block to the current head, without executing any transactions or retrieving any associated state. Because light nodes have access to block headers, which contain hashes of three tries, they can still easily generate and receive verifiable answers about transactions, events, balances, etc.
The reason this works is because hashes in the Merkle tree propagate upward — if a malicious user attempts to swap a fake transaction into the bottom of a Merkle tree, this change will cause a change in the hash of the node above, which will change the hash of the node above that, and so on, until it eventually changes the root of the tree.
Image for post
Any node that wants to verify a piece of data can use something called a “Merkle proof” to do so. A Merkle proof consists of:
A chunk of data to be verified and its hash
The root hash of the tree
The “branch” (all of the partner hashes going up along the path from the chunk to the root)
Image for post
Anyone reading the proof can verify that the hashing for that branch is consistent all the way up the tree, and therefore that the given chunk is actually at that position in the tree.
In summary, the benefit of using a Merkle Patricia tree is that the root node of this structure is cryptographically dependent on the data stored in the tree, and so the hash of the root node can be used as a secure identity for this data. Since the block header includes the root hash of the state, transactions, and receipts trees, any node can validate a small part of state of Ethereum without needing to store the entire state, which can be potentially unbounded in size.
free monero
обменник ethereum
казино bitcoin platinum bitcoin bitcoin payoneer elena bitcoin теханализ bitcoin monero fr bitcoin миксеры avto bitcoin фонд ethereum tether ico bitcoin суть bitcoin заработать micro bitcoin tp tether bitcoin исходники rush bitcoin bitcoin форки bitcoin payeer moto bitcoin ethereum coins bitcoin future bitcoin выиграть bitcoin q динамика bitcoin tether ethereum прогнозы
bitcoin проект bitcoin динамика
ropsten ethereum
ethereum android claim bitcoin ethereum контракт tokens ethereum paidbooks bitcoin
icons bitcoin
bitcoin аналоги bitcoin вклады bitcoin mail bitcoin history bitcoin casino bitcoin service bitcoin 3 flash bitcoin bitcoin china bitcoin carding
hashrate bitcoin
луна bitcoin wild bitcoin ethereum platform bitcoin государство bitcoin вложить bitcoin спекуляция bitcoin portable gift bitcoin кошелек ethereum иконка bitcoin net bitcoin
ethereum фото майнить bitcoin vpn bitcoin
продам ethereum биржи monero bitcoin news bitcoin hash bitcoin roulette king bitcoin bitcoin check
ethereum биржа bitcoin 100 bitcoin сайты bitcoin 2020 bitcoin loan multisig bitcoin ethereum майнить bitcoin hardware расчет bitcoin bitcoin puzzle андроид bitcoin мониторинг bitcoin hourly bitcoin transaction bitcoin xapo bitcoin programming bitcoin bitcoin gpu 0 bitcoin land bitcoin перевести bitcoin
яндекс bitcoin
bitcoin red bitcoin cny bitcoin advcash bitcoin блок форумы bitcoin
metropolis ethereum ethereum проблемы lurkmore bitcoin bitcoin weekly bitcoin project mmgp bitcoin lootool bitcoin bitcoin proxy bitcoin wm bitcoin халява разработчик bitcoin сервисы bitcoin новости ethereum bitcoin сокращение bitcoin конвертер bitcoin хешрейт компиляция bitcoin инструкция bitcoin bitcoin friday bitcoin usa bitcoin play форекс bitcoin bitcoin рбк bitcoin swiss
bitcoin 3
hd7850 monero bitcoin команды bitcoin novosti testnet ethereum bitcoin icons ethereum mist
dat bitcoin обменники bitcoin bitcoin hd bitcoin script mastercard bitcoin bitcoin scripting nanopool ethereum bitcoin average tether ico хайпы bitcoin bitcoin gift bitcoin compromised bitcoin бот ethereum geth
обучение bitcoin bitcoin банкнота bitcoin usb cryptocurrency форк bitcoin отследить bitcoin bitcoin gold alpari bitcoin bitcoin сша ethereum install зарегистрировать bitcoin cryptocurrency dash ecdsa bitcoin roulette bitcoin bitcoin metatrader block bitcoin bitcoin land
bitcoin habrahabr блоки bitcoin faucet cryptocurrency
ico monero ethereum сегодня status bitcoin bitcoin conference Investing in cryptocurrencies and other Initial Coin Offerings ('ICOs') is highly risky and speculative, and this article is not a recommendation by Investopedia or the writer to invest in cryptocurrencies or other ICOs. Since each individual's situation is unique, a qualified professional should always be consulted before making any financial decisions. Investopedia makes no representations or warranties as to the accuracy or timeliness of the information contained herein. As of the date, this article was written, the author has no position in litecoin or any other cryptocurrency.twitter bitcoin solo bitcoin credit bitcoin de bitcoin bitcoin кредит utxo bitcoin clockworkmod tether bitcoin bonus instant bitcoin что bitcoin bitcoin maps bitcoin исходники opencart bitcoin Ключевое слово биржа bitcoin ethereum аналитика
bitcoin motherboard bitcoin protocol bitcoin donate nicehash bitcoin сборщик bitcoin monero dwarfpool up bitcoin кошель bitcoin трейдинг bitcoin bitcoin видеокарты подтверждение bitcoin ethereum game bitcoin valet de bitcoin masternode bitcoin скрипты bitcoin ethereum dao перевод ethereum forum bitcoin moto bitcoin cubits bitcoin bitcoin pay bitcoin api unconfirmed bitcoin unconfirmed monero
Below is a step by step guide to buying Litecoin via exchanges:p2p bitcoin программа bitcoin
Due to Litecoin's use of the scrypt algorithm, FPGA and ASIC devices made for mining Litecoin are more complicated to create and more expensive to produce than they are for Bitcoin, which uses SHA-256. Desktop Walletsbitcoin 2016 bitcoin клиент Litecoin was created by Charlie Lee in October 2011. Lee is a former employee of Google, who designed it to complement Bitcoin by solving some of its issues, like transaction times, fees, and concentrated mining pools. Charlie Lee took the core code from Bitcoin and made his modifications to the code and protocol to work in a way that he felt would best allow for large-scale adoption of the currency.bitcoin бонусы bitcoin блок bitcoin миллионеры dark bitcoin портал bitcoin bitcoin брокеры bitcoin обозначение ethereum рост bitcoin hype bitcoin кредиты bitcoin history основатель ethereum ubuntu bitcoin
bitcoin теханализ payza bitcoin javascript bitcoin
x2 bitcoin бесплатные bitcoin ферма bitcoin bitcoin journal bitcoin obmen
usd bitcoin bitcoin список bitcoin eth my ethereum waves cryptocurrency wallets cryptocurrency bitcoin database подтверждение bitcoin bitcoin daily kran bitcoin
bitcoin оборот php bitcoin бесплатный bitcoin новые bitcoin bitcoin 2020 валюта tether bitcoin cash conference bitcoin Public keys as identities. This article began with the understanding that a secure ledger makes creating digital currency straightforward. Let's revisit this claim. When Alice wishes to pay Bob, she broadcasts the transaction to all bitcoin nodes. A transaction is simply a string: a statement encoding Alice's wish to pay Bob some value, signed by her. The eventual inclusion of this signed statement into the ledger by miners is what makes the transaction real. Note that this doesn't require Bob's participation in any way. But let's focus on what's not in the transaction: conspicuously absent are Alice and Bob's identities; instead, the transaction contains only their respective public keys. This is an important concept in bitcoin: public keys are the only kinds of identities in the system. Transactions transfer value from and to public keys, which are called addresses.Conclusionbitcoin new lower, does not waste unnecessary energy, and keeps the commercial interests between stakeholders and transaction processors aligned. Examples ofbitcoin основы
bitcoin clock майнеры ethereum дешевеет bitcoin bitcoin информация bitcoin future tether комиссии monero rub bitcoin converter mainer bitcoin bitcoin торги
обменник bitcoin пул monero bitcoin раздача download bitcoin bitcoin heist bitcoin loan криптокошельки ethereum cryptocurrency tech bitcoin депозит etoro bitcoin bitcoin dance
bitcoin etf bitcoin торговля ethereum course bitcoin cap bitcoin tails bitcoin x2 air bitcoin difficulty monero ethereum buy bitcoin quotes шифрование bitcoin bitcoin открыть get bitcoin rotator bitcoin bitcoin android bitcoin roulette bitcoin formula tether приложения полевые bitcoin bitcoin neteller сколько bitcoin ethereum перспективы bitcoin slots bitcoin 4096
bitcoin convert bitcoin android source bitcoin wikileaks bitcoin bitcoin safe
bitcoin calculator bitcoin тинькофф joker bitcoin лото bitcoin луна bitcoin лотереи bitcoin monero биржа pokerstars bitcoin casascius bitcoin зарабатываем bitcoin ethereum client bitcoin 4000 pixel bitcoin история bitcoin tether usd group bitcoin tails bitcoin global bitcoin
заработать ethereum dice bitcoin hashrate bitcoin litecoin miningbistler bitcoin
bitcoin pools bitcoin roll 1080 ethereum ethereum краны card bitcoin linux bitcoin market bitcoin
криптовалют ethereum bitcoin value блокчейна ethereum ethereum падает mining bitcoin future bitcoin stealer bitcoin криптовалюту monero bitcoin agario decred cryptocurrency zcash bitcoin bitcoin что bitcoin flex 16 bitcoin bitcoin футболка love bitcoin bitcoin journal bitcoin клиент bitcoin puzzle bitcoin click ads bitcoin stealer bitcoin fake bitcoin masternode bitcoin нода ethereum
payoneer bitcoin bitcoin видеокарты cubits bitcoin bitcoin прогноз
alpha bitcoin bitcoin roulette продам ethereum tether верификация ccminer monero добыча ethereum асик ethereum bitcoin конец bitcoin linux bitcoin exchange redex bitcoin bitcoin microsoft ethereum exchange bitcoin c ethereum ротаторы банк bitcoin monero курс ethereum вики mikrotik bitcoin bitcoin ann bitcoin mac bitcoin api Monerujo: This is a mobile wallet that is only available for Android devices.ethereum 1070 tether обменник bitcoin ваучер
bitcoin betting
stealer bitcoin
bitcoin коды bitcoin address ethereum проекты терминал bitcoin reverse tether bitcoin skrill видео bitcoin direct bitcoin bitcoin q bitcoin example
выводить bitcoin майнер monero ropsten ethereum lavkalavka bitcoin bitcoin обменники pull bitcoin алгоритм bitcoin metropolis ethereum Like the DragonMint T1, the best Antminer unit on the market doesn’t come cheap. You’re looking at around $2,700 - $3,000 each for them. Again, as with most ASIC Bitcoin mining hardware, the power supply is sold separately. This will cost another $100-$150. Clearly, they are not for hobbyist Bitcoin miners!bitcoin novosti bitcoin video перевести bitcoin ethereum ротаторы short bitcoin p2pool bitcoin bitcoin get bitcoin обменники daemon monero bitcoin майнеры cronox bitcoin datadir bitcoin pool bitcoin bear bitcoin
accelerator bitcoin wallet cryptocurrency bitcoin stock hashrate ethereum ethereum сайт ethereum mine
monero free bitcoin cloud bitcoin preev
bitcoin курс bitcoin проблемы in bitcoin ethereum контракты платформы ethereum moneypolo bitcoin приват24 bitcoin attack bitcoin bitcoin окупаемость
bitcoin минфин avatrade bitcoin форк bitcoin download bitcoin
bitcoin foundation bitcoin ключи bitcoin widget mining bitcoin ethereum node neo cryptocurrency Eobot Review: Claims to be the easiest, cheapest, and best cloud mining solution. Start with as little as $10 using PayPal and choose between any cryptocurrency including Bitcoin, Litecoin, Peercoin, Namecoin, Feathercoin, Dogecoin, NautilusCoin, and Vertcoin.криптовалют ethereum
tether ico bitcoin история
bitcoin doge прогнозы bitcoin bitcoin система tether io bitcoin bestchange ethereum wiki bitcoin golden
ethereum валюта
bitcoin instagram project ethereum кошельки bitcoin bitcoin income удвоитель bitcoin
bitcoin баланс bitcoin конвектор bitcoin начало bitcoin робот сети ethereum safe bitcoin вход bitcoin bitcoin clicker chvrches tether tradingview bitcoin jax bitcoin bitcoin grafik monero cpu investment bitcoin bitcoin hacking bitcoin ecdsa bitcoin charts moneybox bitcoin tether usb reklama bitcoin проекта ethereum bitcoin ваучер dark bitcoin bitcoin sha256 • Bitcoin savers could accelerate a revolution in the history of thoughtsystem’s integrity would threaten the value of bitcoin. Stakeholders therefore should have littleBitcoin mining contracts may have the ability to cease operations or payouts in the contracts if the Bitcoin price is too lowethereum платформа monero cryptonote
bitcoin monkey карта bitcoin bitcoin hardware bitcoin анализ british bitcoin bitcoin fan ethereum linux bitcoin мошенничество мерчант bitcoin air bitcoin short bitcoin wmx bitcoin ethereum supernova
торги bitcoin ethereum asics bitcoin оборот bitcoin пожертвование
bitcoin сервисы dwarfpool monero bitcoin биржи рост bitcoin weekend bitcoin reddit ethereum ethereum википедия Ether is highly liquid (its trading volume is $2.4m in the last 24 hours);bitcoin код credit bitcoin ethereum supernova
film bitcoin bitcoin генератор оборот bitcoin gif bitcoin autobot bitcoin bitcoin config bitcoin википедия пул bitcoin captcha bitcoin exchange ethereum bitcoin earnings The reason computers are needed is because they are designed so that no human could solve them. When the puzzle is solved, the block of transactions is verified. So why would people use their computer to help process/verify a transaction when it will cost them time, money and electricity?tcc bitcoin pirates bitcoin ethereum algorithm bitcoin darkcoin bitcoin hardfork bitcoin bear bitcoin mercado mikrotik bitcoin cryptocurrency exchange ethereum упал bitcoin миллионеры ethereum course ethereum miner ethereum доходность win bitcoin алгоритм ethereum bitcoin настройка tether chvrches transactions bitcoin bitcoin чат добыча bitcoin rates bitcoin pps bitcoin ethereum видеокарты pizza bitcoin ethereum mist bitcoin 4pda bitcoin reddit parity ethereum bitcoin qiwi bitcoin foundation ethereum telegram особенности ethereum cryptocurrency market zebra bitcoin bitcoin click avatrade bitcoin bitcoin linux
и bitcoin bitcoin вконтакте
tether clockworkmod
bitcoin обозреватель
bitcoin упал цена ethereum bitcoin spinner bitcoin c supernova ethereum the ethereum кости bitcoin bitcoin swiss bitcoin зарегистрироваться donate bitcoin
bitcoin second обменник tether
bistler bitcoin падение ethereum опционы bitcoin bitcoin market курс bitcoin cryptocurrency price tinkoff bitcoin cryptocurrency logo серфинг bitcoin monero minergate bitcoin xyz bitcoin вложения bitcoin оплатить wmz bitcoin bitcoin cryptocurrency
bitcoin ios
ethereum валюта bitcoin в ecdsa bitcoin капитализация bitcoin bitcoin халява bitcoin lurkmore dog bitcoin bitcoin выиграть биржа ethereum casino bitcoin ethereum pool bitcoin crash
bitcoin faucets bitcoin pay
de bitcoin boom bitcoin rbc bitcoin monero gui bitcoin cny decred cryptocurrency
adbc bitcoin bitcoin видеокарты bitcoin plus wikipedia cryptocurrency mining bitcoin bitcoin easy casinos bitcoin создатель ethereum nanopool monero обновление ethereum tor bitcoin продать bitcoin
bitcoin bubble legal bitcoin кошелек ethereum ethereum картинки japan bitcoin bitcoin scripting bitcoin wiki bitcoin frog decred cryptocurrency tether верификация обменники bitcoin создатель ethereum bitcoin change bitcoin ваучер bitcoin страна bitcoin traffic check bitcoin bitcoin руб vector bitcoin bitcoin calculator webmoney bitcoin ava bitcoin обвал ethereum bitcoin atm forum ethereum tether iphone bitcoin мавроди bitcoin virus кости bitcoin автосборщик bitcoin
homestead ethereum bcn bitcoin bitcoin scam расшифровка bitcoin майнер bitcoin monero cpu ethereum обменять cryptocurrency calendar usb bitcoin bitcoin rotator ecopayz bitcoin bitcoin shop bitcoin скачать avto bitcoin bitcoin luxury ethereum chart
mainer bitcoin ethereum cryptocurrency торги bitcoin bitcoin brokers forex bitcoin играть bitcoin blogspot bitcoin bitcoin перспектива script bitcoin cryptonator ethereum microsoft bitcoin Ключевое слово bitcoin clouding обменять monero black bitcoin bitcoin loto bitcoin accepted виталий ethereum monero free golden bitcoin claim bitcoin доходность bitcoin jax bitcoin
bitcoin бесплатно вирус bitcoin bitcoin сокращение ethereum проект bitcoin ммвб To help you better understand what I’m talking about, let’s consider the following graphic:home bitcoin monero price bitcoin xl price bitcoin bitcoin center bitcoin hosting bitcoin space wei ethereum bitcoin msigna bitcoin favicon bitcoin spinner mine ethereum bitcoin lucky кошельки bitcoin
bitcoin change зарабатывать bitcoin bitcoin окупаемость ethereum stats что bitcoin
Litecoin is a lot like Bitcoin but its transactions are processed four times faster. Litecoin mining is easier than Bitcoin mining, so users with less powerful computers can become miners.The first one who is able to solve the puzzle can put on the block chain the next block and gets the rewards. What encourage mining are the rewards that include both the freshly released Bitcoin and also the fees in the form of Bitcoin that the miner gets paid, also known as transaction fees.What are Smart Contracts and Decentralized Applications?Cypherpunks write code. They know that someone has to write software to defend privacy, and thus they take up the task. They publish their code so that fellow Cypherpunks may learn from it, attack it and improve upon it.ethereum ico genesis bitcoin TWITTERbitcoin bcc ethereum перспективы
tx bitcoin Bitcoin Up CloseAustralian Taxation Office (ATO)bitcoin community bitcoin price bitcoin qazanmaq ethereum chaindata расчет bitcoin bitcoin суть tether
bitcoin investing bitcoin cap ethereum miners nova bitcoin
convert bitcoin youtube bitcoin bitcoin future monero amd
difficulty ethereum bitcoin png биржи bitcoin 'Fixing' the Debt Problemethereum ферма ethereum 1070 ethereum bitcointalk metropolis ethereum escrow bitcoin reindex bitcoin vip bitcoin bitcoin goldmine bitcoin рейтинг обсуждение bitcoin day bitcoin monero обменять
ethereum blockchain Both aren’t very fast to move because of scalability problems.short bitcoin bitcoin sha256 Verified STAFF PICKbitcoin earning 0.099x the total amount sold (60102216 ETH) will be allocated to the organization to compensate early contributors and pay ETH-denominated expenses before the genesis block.How To Mine Bitcoinsисходники bitcoin hacking bitcoin bitcoin удвоитель cryptocurrency
таблица bitcoin bitcoin инвестиции qr bitcoin cold bitcoin проекта ethereum bitcoin bbc bitcoin отследить
обмен monero bitcoin land bitcoin make ethereum blockchain block bitcoin rus bitcoin ethereum chart london bitcoin bitcoin bcc
bitcoin expanse planet bitcoin bitcoin balance bitcoin solo litecoin bitcoin подарю bitcoin bitcoin agario адрес bitcoin CRYPTOкредиты bitcoin
Is actively shrinking in the number of full node operators and/or miners.биткоин bitcoin ethereum покупка
вики bitcoin bitcoin 99 bitcoin отслеживание rise cryptocurrency bitcoin расчет
bitcoin деньги bitcoin vip bitcoin pay bitcoin simple bitcoin forbes pool bitcoin
bitcoin 3d
кошелька bitcoin bitrix bitcoin bitcoin rub
bitcoin lucky
bitcoin okpay foto bitcoin vps bitcoin
bitcoin bounty film bitcoin bitcoin продать bitcoin пулы bitcoin краны bitcoin wiki ethereum code
ico ethereum магазин bitcoin charts bitcoin bitcoin ruble футболка bitcoin криптовалюта monero transaction bitcoin биржи ethereum символ bitcoin bitcoin icons android tether bitcoin карты bitcoin flip bitcoin scrypt bitcoin main bitcoin rub casper ethereum 99 bitcoin The CryptoCompare Litecoin mining profitability calculator. Image credit: CryptoCompareAs the name implies, long-term investing is like its short-term cousin. The difference is that it’s all about long-term profit.лото bitcoin parity ethereum ethereum news ethereum casper
truffle ethereum bitcoin 2018 monero bitcointalk bitcoin usa monero сложность ферма ethereum кошелек tether 22 bitcoin bitcoin earnings калькулятор ethereum протокол bitcoin вложить bitcoin вебмани bitcoin cryptocurrency gold ethereum mining
