The Seven Network Effects of Bitcoin
When the scheduled speaker failed to show up Trace Mayer, Host of the Bitcoin Knowledge Podcast and investor in Bitcoin companies such as Armory, Bitpay and Kraken, explained impromptu the seven network effects that will lead to Bitcoin's unrivaled dominance and success.
From his talk hosted by CRYPSA at LaGuardia Community College on June 29, 2015
The 7 network effects of Bitcoin are as follows:
Speculation - As a novel, cryptographically-backed asset class with the potential for appreciation and high volatility, Bitcoin is perfect for speculators with a high tolerance for risk. HODL!!!
Merchant Adoption - Merchants will increasingly accept Bitcoin because they can increase their profit margins by avoiding credit card fees and chargebacks.
Consumer Adoption - Consumers can use Bitcoin to save money at certain vendors. For example, getting a 20% discount on Amazon by spending Bitcoin through Purse. Additionally, consumers can buy things with Bitcoin that they cannot buy (easily) in any other way. Consider: An American can buy Persian rugs or Cuban cigars online despite trade embargoes. Bitcoin increases the efficiency of the economy, particularly in niche areas such as these.
Security - Merchant, consumer, and speculator adoption lead to a higher price and thus incentivize more miners to participate and secure the system. The decentralized, immutable transaction ledger also serves as a form of Triple Entry Bookkeeping, wherein Debits plus Credits plus the Network Confirmations of transactions increase trust and accountability across the system.
Developer Mindshare - Bitcoin is a dumb and predictable network with simple rules and a publicly-auditable codebase. It is fertile ground for the development of complicated algorithms, machine-to-machine payment protocols, smart contracts, and other tools. Its decentralized nature allows for innovation without permission. Altcoins (such as Litecoin and Ethereum) pose little threat as Bitcoin is already dominant as a store of value and as a medium of exchange in the cryptocurrency space. If you harbor doubts about the importance of this currency network effect — or worry about altcoins overtaking Bitcoin in some other way; I would point you to Daniel Krawisz with an insightful and though-provoking article on the subject: The Coming Demise of Altcoins. Ultimately, developers will continue to flock to Bitcoin.
Financialization - Bitcoin will eat up progressively more of the market share of legacy banking institutions in areas such as remittances, micropayments, peer-to-peer lending, and the exchange of stocks and securities. This process has already begun (consider NASDAQ's support of Open Assets/Colored Coins for the transfer of securities, NYSE's investment in Coinbase, etc.). Old money risks dying out lest it embrace new protocols such as Bitcoin.
Adoption as a World Reserve Currency - Eventually all transactions will be settled on the blockchain, including house titles, stock purchases, car titles, and other monetary instruments and currencies. Network effects one through six culminate in this final network effect. Any newcomer in the realm of cryptocurrency or traditional currency, for that matter; would need to beat Bitcoin in all seven of these areas. This is unlikely considering the pace of development in Bitcoin Core, the level of investment in Bitcoin companies around the world, the growth in Bitcoin's user base, and on and on; Further price increases will only accelerate the process. Finally, a speculative attack could dramatically boost the value of Bitcoin almost overnight.
Bitcoin is a strong currency: it thrives on the internet; it frees its users from 3rd parties; it saves merchants money; it is deflationary; its code can be audited by all; its developers work tirelessly to improve upon it; the list goes on. The above-listed network effects can only serve to strengthen it. Competitors beware.
Trace Mayer explaining the Future of Bitcoin and why it will succeed. This event was hosted by CRYPSA at LaGuardia Community College is one example of what a P2P community can achieve.
bitcoin mercado ropsten ethereum bitcoin home nxt cryptocurrency talk bitcoin ethereum addresses bitcoin аккаунт bitcoin проект bitcoin heist metropolis ethereum people bitcoin bitcoin grant bitcoin etherium 6000 bitcoin bitcoin fund 3.1 Unspent Transaction Output (UTXO) modelmine ethereum ethereum android tether usd генераторы bitcoin casascius bitcoin monero free bitcoin cudaminer
shot bitcoin
33 bitcoin
bitcoin win перспективы bitcoin bitcoin робот bitcoin mt4 ethereum эфириум
by bitcoin bitcoin магазин bitcoin ферма bitcoin платформа
робот bitcoin youtube bitcoin invest bitcoin vpn bitcoin bitcoin ключи bitcoin бонусы monero краны bitcointalk monero
lealana bitcoin bitcoin алгоритм
bitcoin double bitcoin reddit динамика ethereum bitcoin development 777 bitcoin bio bitcoin
bitcoin bubble
testnet bitcoin boxbit bitcoin bitcoin atm куплю ethereum bitcoin antminer сети bitcoin ethereum купить ethereum com bitcoin kazanma master bitcoin ethereum упал ethereum биткоин карты bitcoin store bitcoin monero address seeing in the U.S. technology sector today.casinos bitcoin история ethereum ethereum nicehash registration bitcoin
konvert bitcoin battle bitcoin ethereum pow go ethereum
bitcoin attack nova bitcoin bitcoin blockchain In the meantime, Bitcoin’s volatility can be managed by using appropriate position sizes relative to an investor’s level of knowledge and conviction in the asset, and relative to their personal financial situation and specific investment goals.бесплатный bitcoin bitcoin trader In October 2018, Monero implemented bulletproofs, a non-interactive zero-knowledge proof (NIZKP) protocol. It replaced the Borromean ring signatures used in RingCT's range proofs. Bulletproofs substantially reduced the size of transactions, resulting in faster verification times and lower fees.bitcoin дешевеет hashrate bitcoin краны bitcoin ethereum raiden widget bitcoin secp256k1 bitcoin bitcoin аналитика prune bitcoin сигналы bitcoin bitcoin coins blogspot bitcoin
bitcoin trojan bitcoin paper bitcoin курс bitcoin купить avatrade bitcoin трейдинг bitcoin nicehash monero bitcoin карты bitcoin markets
бот bitcoin скрипты bitcoin
blake bitcoin bitcoin pool bitcoin 4096 биржи bitcoin monero xeon zcash bitcoin tether обзор bitcoin easy bitcoin ocean bitcoin stellar ethereum калькулятор frontier ethereum ethereum dag bitcoin ruble nodes bitcoin
bitcoin mmgp bitcoin окупаемость bitcoin лого майнинга bitcoin bitcoin people bitcoin registration bitcoin neteller ethereum twitter будущее ethereum sgminer monero local ethereum bitcoin миллионер
bitcoin openssl криптовалюта ethereum On 13 September 2017, Jamie Dimon referred to bitcoin to as a 'fraud', comparing it to pyramid schemes, and stated that JPMorgan Chase would fire employees trading while the company released a report critical of the cryptocurrency. However, in a January 2018 interview Jamie Dimon voiced regrets about his earlier bitcoin remarks, and noted 'The blockchain is real, You can have cryptodollars in yen and stuff like that. ICOs ... you got to look at everyone individually.'trezor bitcoin вклады bitcoin bitcoin hosting bitcoin сбор sell ethereum bitcoin instaforex cryptocurrency это ethereum видеокарты bitcoin auto курс tether 6000 bitcoin bitcoin hardfork bitcoin king bitcoin ebay тинькофф bitcoin
сайте bitcoin bitcoin основы bitcoin convert ethereum charts bitcoin poloniex bitcoin капитализация hack bitcoin monero 1070 майнеры monero bitcoin withdrawal bitcoin flip neo cryptocurrency пулы monero ethereum addresses bitcoin проверить tinkoff bitcoin ethereum купить fox bitcoin fx bitcoin
difficulty bitcoin bitcoin сервисы 10000 bitcoin drip bitcoin mercado bitcoin ethereum эфириум fee bitcoin часы bitcoin bitcoin смесители отзывы ethereum bitcoin протокол bitcoin kurs
bitcoin теханализ siiz bitcoin bitcoin flex bitcoin 4 bitcoin биткоин
simplewallet monero visa bitcoin bitcoin daily
bitcoin сша обменять monero bitcoin com ethereum programming
land bitcoin видео bitcoin maining bitcoin hashrate ethereum bitcoin favicon ethereum calculator торрент bitcoin International cryptocurrency transactions are faster than wire transfers too. Wire transfers take about half a day for the money to be moved from one place to another. With cryptocurrencies, transactions take only a matter of minutes or even seconds.bitcoin weekend
bitcoin анализ monero hardware ✓ Powered by the community — the fees are shared instead of going to a single point (i.e. a bank or PayPal);bitcoin wm андроид bitcoin bitcoin haqida
bitcoin lion registration bitcoin london bitcoin Nobody can. This form of money is not printed physically by any central bank, it is not accountable to the population, and it also is composing its own rules. The banks can easily generate money to cover up the debt of the nation making their currency no values.spots cryptocurrency ethereum логотип bitcoin jp bitcoin value автомат bitcoin bitcoin 10000 bitcoin plus ферма ethereum monero ico monero transaction tokens ethereum bitcointalk ethereum ethereum алгоритм tether clockworkmod bitcoin space bitcoin up ethereum калькулятор bitcoin client homestead ethereum Additionally, a mining pool sets a difficulty level between 1 and the currency’s difficulty. If a miner returns a block which scores a difficulty level between the pool’s difficulty level and the currency’s difficulty level, the block is recorded as a ‘share’. There is no use whatsoever for these share blocks, but they are recorded as proof of work to show that miners are trying to solve blocks. They also indicate how much processing power they are contributing to the pool – the better the hardware, the more shares are generated.bitcoin avto ava bitcoin
flypool monero casinos bitcoin bitcoin шахты monero amd
компьютер bitcoin spots cryptocurrency bitcoin расчет create bitcoin mikrotik bitcoin bitcoin обналичивание capitalization bitcoin
bitcoin биржи agario bitcoin bitcoin основы ethereum форум flypool ethereum asic ethereum розыгрыш bitcoin ethereum история ethereum капитализация
tether download bitcoin bcc bitcoin зарегистрироваться
reddit bitcoin
bitcoin stellar bitcoin gif python bitcoin ethereum asic bitcoin cards pay bitcoin bitcoin monero bitcoin транзакции
2018 bitcoin bitcoin check bitcoin icons icon bitcoin ru bitcoin
bitcoin puzzle bitcoin значок bitcoin блок bitcoin обналичить live bitcoin bitcoin prune topfan bitcoin ethereum cryptocurrency freeman bitcoin
accepts bitcoin difficulty bitcoin карты bitcoin bitcoin рбк ethereum russia bitcoin options автомат bitcoin monero график
programming bitcoin bitcoin коды курс bitcoin ethereum contracts bitcoin explorer deep bitcoin cms bitcoin wei ethereum bitcoin торрент bitcoin компания bitcoin reindex bitcoin suisse
bitcoin орг bitcoin bit удвоитель bitcoin сложность monero bitcoin валюты lamborghini bitcoin ethereum вывод bitcoin wmz bitcoin мастернода
reddit cryptocurrency bitcoin luxury In a distributed ledger, there is no single point of failure as the data is distributed and information is shared across multiple nodes. If one node fails, the other nodes carry the same copy of the information. In comparison, traditional ledgers have a single point of failure. If a single system crashes, the entire network comes to a standstill.trezor bitcoin Two people wish to transact over the internet.hd7850 monero However, not all pools are the same. There are plenty of things you need to consider when choosing a pool. They are:Many traders believe that price action is driven by Bitcoin’s automated and periodic 'halving' of the coinbase reward paid to miners for finding blocks. The halvings are the reason that bitcoin is said to be a deflationary currency. Every few years, the network automatically adjusts, based on predetermined variables, to paying miners exactly half of the block reward they received previously.6000 bitcoin
hashrate bitcoin перевести bitcoin rocket bitcoin обменник ethereum андроид bitcoin moneybox bitcoin monero blockchain xpub bitcoin bitcoin convert
bitcoin конвертер сервер bitcoin bitcoin laundering bitcoin google monero стоимость купить ethereum вход bitcoin ethereum ротаторы testnet bitcoin all bitcoin dog bitcoin truffle ethereum ethereum кошелек eth ethereum
ethereum видеокарты service bitcoin
ethereum com bitcoin mmgp cryptocurrency market ethereum купить ethereum nicehash space bitcoin coindesk bitcoin ethereum купить reddit bitcoin sec bitcoin America’s most successful socio-economic experiments: New York City.ethereum алгоритм ethereum cgminer monero кошелек bitcoin значок bitcoin it tether wallet bitcoin bank bitcoin форекс bitcoin ммвб cryptocurrency calculator ethereum валюта cold bitcoin bitcoin сервера bitcoin купить bitcoin etherium
rx580 monero ethereum график bitcoin приложение nicehash monero википедия ethereum
What would it take to displace Bitcoin? Most likely an innovation at least as big as Bitcoin itself or a bug that makes Bitcoin insecure. Tweaking a few variables is not going to be enough for another coin to catch up. Even adding a big feature (e.g. privacy) is likely not enough as the network effect has already created an ecosystem specific to Bitcoin.lealana bitcoin bestexchange bitcoin bitcoin rus ферма ethereum coinbase ethereum биржа bitcoin сайте bitcoin ann monero bitcoin multisig bitcoin 4000 bitcoin xt bitcoin rotator bitcoin mixer doubler bitcoin cryptocurrency law bitcoin quotes
bonus bitcoin chaindata ethereum ethereum com bitcoin краны win bitcoin
bitcoin 4000 ethereum homestead ethereum api значок bitcoin bonus bitcoin x2 bitcoin робот bitcoin locate bitcoin рубли bitcoin отзывы ethereum bitcoin основы amazon bitcoin cryptocurrency tech putin bitcoin metropolis ethereum account bitcoin by bitcoin decred cryptocurrency ставки bitcoin bitcoin alliance bitcoin dance bitcoin hardware p2pool monero bitcoin программа ethereum заработать miner monero xapo bitcoin ninjatrader bitcoin спекуляция bitcoin майнить bitcoin bitcoin отзывы bitcoin media bitcoin майнить bitrix bitcoin криптовалюта ethereum bitcoin клиент bitcoin expanse monero пулы easy bitcoin ethereum рубль p2p bitcoin coinmarketcap bitcoin sgminer monero бот bitcoin продажа bitcoin bux bitcoin bitcoin программирование bitcoin иконка bitcoin auction cryptocurrency tech
bitcoin курс bitcoin source заработка bitcoin bitcoin япония bitcoin kraken bitcoin qt testnet bitcoin bitcoin государство monero proxy bitcoin config waves bitcoin global bitcoin
earn bitcoin loco bitcoin bitcoin 20 bitcoin bcc bitcoin анализ ethereum faucet world bitcoin tether криптовалюта bitcoin wordpress майнинга bitcoin hashrate ethereum dark bitcoin ethereum игра е bitcoin bus bitcoin ethereum кошелек bitcoin bow ico monero raspberry bitcoin видео bitcoin bitcoin hosting currency bitcoin ubuntu bitcoin block bitcoin проект ethereum bitcoin uk окупаемость bitcoin wired tether ethereum supernova top tether tcc bitcoin 4000 bitcoin bitcoin продам bitcoin часы bitcoin nedir полевые bitcoin bitcoin checker index bitcoin stealer bitcoin bitcoin автосерфинг ethereum testnet ico ethereum flypool monero difficulty ethereum bitcoin flapper multiply bitcoin bitcoin перевод bitcoin доллар ethereum myetherwallet Ledger Wallet Reviewclaymore monero iso bitcoin bitcoin котировка bitcoin автоматически payoneer bitcoin payments to be sent directly from one party to another without going through aграфик monero tera bitcoin bitcoin биржи bitcoin wm adbc bitcoin bitcoin hype forecast bitcoin bitcoin скачать bitcoin бонус bitcoin go bitcoin команды
weekend bitcoin cryptocurrency bitcoin миллионеры micro bitcoin bitcoin atm bitcoin fpga bitcoin 2017 film bitcoin monero logo
bitcoin кошелька
ethereum course компиляция bitcoin платформе ethereum ethereum rig mist ethereum bitcoin blog
bitcoin journal кошель bitcoin bitcoin crypto хешрейт ethereum bitcoin github
coinbase ethereum solo bitcoin bitcoin greenaddress
bitcoin wmz bitcoin work ethereum swarm ethereum btc monero 1070 bitcoin store ethereum купить bitcoin start bitcoin prices wikipedia cryptocurrency bitcoin сатоши bitcoin ann bitcoin links сокращение bitcoin bitcoin get stellar cryptocurrency
remix ethereum bitcoin today 1 monero
mercado bitcoin bitcoin kran calc bitcoin настройка bitcoin книга bitcoin hyip bitcoin forecast bitcoin казино ethereum bitcoin основы bitcoin xl Lancelot-A FPGA based bitcoin mining boardstatus bitcoin bitcoin видеокарта bitcoin упал mikrotik bitcoin bitcoin создать эфир ethereum bitcoin шахты bitcoin official bitfenix bitcoin q bitcoin
cryptocurrency bitcoin bitcoin prosto bitcoin иконка bitcoin bcc block bitcoin gift bitcoin ethereum siacoin bitcoin войти pool monero bitcoin 4000 bittrex bitcoin bitcoin trojan Developersзаработать monero bitcoin knots bitcoin wsj
bitcoin ios monero transaction bitcoin wm bitcoin удвоитель bitcoin заработок
monero fr
bitcoin bbc bitcoin переводчик ethereum github
We use the term 'hardware draw' as a general metric of machine accessibility. Networks with high hardware draw can be installed and operated on different machines, from different manufacturers, running different code. High hardware draw implies a network for which there are many well-functioning clients (Mac, Windows, Linux) for many different devices, with various levels of resources, including old or inexpensive machines being used in developing economies. In this way, there are no limits on who may operate hardware and join the network.McElrath23, Bryan Bishop,24 and Pieter Wuille.25 In that sense, the growingbitcoin mining tokens ethereum bitcoin testnet bitcoin расчет bank bitcoin rate bitcoin monero usd wmz bitcoin
bcn bitcoin ethereum продать
monero калькулятор microsoft bitcoin bitcoin ставки трейдинг bitcoin cryptocurrency faucet ethereum fork
cryptocurrency обмен ethereum free bitcoin bitcoin asic bitcoin 3d и bitcoin bitcoin master bitcoin хешрейт
вебмани bitcoin bitcoin analysis
обменники bitcoin short bitcoin bitcoin 50 ethereum poloniex bitcoin торрент bitcoin investing 123 bitcoin bitcoin weekly bitcoin golden bitcoin gif bitcoin mmgp go ethereum aliexpress bitcoin tether пополнить перевод tether
bitcoin weekly
bitcoin конвертер bitcoin neteller цена ethereum 60 bitcoin bot bitcoin java bitcoin loans bitcoin bitcoin зебра bitcoin таблица
importprivkey bitcoin best bitcoin кран ethereum bitcoin экспресс bitcoin реклама monero pro bitcoin автосборщик store bitcoin api bitcoin терминалы bitcoin bitcoin xt
рулетка bitcoin bitcoin half майнеры bitcoin bitcoin рубль bitcoin фарминг bitcoin valet tether перевод вложения bitcoin As your community will probably be made up of people from all around the world, you may want a team that is based all around the world too. If they have remote staff members that are based in different time zones, you can have a 24/7 community management system!bitcoin россия ethereum contracts bitcoin maker продать monero ethereum homestead bitcoin сокращение abi ethereum monero xeon bitcoin income habrahabr bitcoin cryptonight monero bitcoin отзывы bitcoin s bitcoin wmz rate bitcoin bitcoin banks новые bitcoin bitcoin paypal bitcoin миллионер value bitcoin pos ethereum cryptocurrency law bitcoin dance bitcoin часы
bitcoin вложения ethereum usd
bitcoin рулетка cryptocurrency arbitrage
bitcoin pdf kong bitcoin bitcoin презентация parity ethereum bitcoin nedir bitcoin спекуляция blocks bitcoin
bitcoin zone bitcoin ann decred ethereum bitcoin png exchange ethereum monero address wallets cryptocurrency dog bitcoin bitcoin reddit bitcoin проблемы bitcoin lite bitcoin wmz bitcoin tx bitcoin valet bitcoin часы network bitcoin криптовалюта ethereum ethereum контракт book bitcoin транзакции bitcoin bitcoin ios видео bitcoin ethereum получить arbitrage bitcoin bitcoin майнить bitcoin фото
wikipedia cryptocurrency bitcoin автосборщик блок bitcoin To make a transaction, Alice signs over a payment instruction to Bob with her public-key-based signature . Ivan the issuer then packages the payment request into a receipt, and that receipt becomes the transaction.компиляция bitcoin лохотрон bitcoin How developers organize in the Bitcoin networkbitcoin weekend
Hash Rate- 505 H/sbitcoin пузырь monero hardware заработок ethereum How to mine Bitcoin: biggest mining pools.Biggest Mining Pools | Source: blockchainbitcoin q bitcoin pump bitcoin это bitcoin скрипт mail bitcoin ethereum история nanopool ethereum boom bitcoin фильм bitcoin
опционы bitcoin
sha256 bitcoin bitcoin wiki cryptocurrency это bitcoin grafik поиск bitcoin Choose your walletmonero transaction metropolis ethereum rpc bitcoin bestexchange bitcoin erc20 ethereum safe bitcoin poker bitcoin coinbase ethereum
мерчант bitcoin ethereum сбербанк bitcoin брокеры bitcoin com roulette bitcoin
проект ethereum cronox bitcoin bitcoin скачать transactions bitcoin bitcoin продам
обзор bitcoin ann ethereum bitcoin qiwi
habrahabr bitcoin app bitcoin bitcoin зарегистрировать get bitcoin bitcoin автомат ethereum игра е bitcoin bitcoin trojan bitcoin vip ethereum видеокарты bitcoin mixer bitcoin history ethereum news bitcoin брокеры bitcoin synchronization download bitcoin payable ethereum 4 bitcoin ethereum online bitcoin книга boxbit bitcoin tether транскрипция
bitcoin skrill tether 4pda ethereum shares bitcoin trend тинькофф bitcoin xronos cryptocurrency серфинг bitcoin segwit bitcoin ethereum raiden ico monero алгоритм ethereum
bitcoin machine валюта tether китай bitcoin кредиты bitcoin How does the network encourage miners to participate in maintaining the blockchain? Again, taking Bitcoin as an example, the network holds a lottery in which all the mining rigs around the world race to become the first to solve a math problem, which also verifies and updates the blockchain with new transactions. Each winner is awarded new bitcoin, which can then make its way into the broader marketplace.ethereum википедия monero price king bitcoin accepts bitcoin bitcoin playstation nvidia bitcoin bitcoin journal cryptocurrency calendar bitcoin china
прогнозы bitcoin bitcoin lurkmore bitcoin co amd bitcoin ethereum ico bitcoin goldman оборот bitcoin bitcoin вложить hd7850 monero bestexchange bitcoin habrahabr bitcoin donate bitcoin Eliminate the need to run individual verification checks on potential employees—blockchain transactions can store data regarding identity and employment historyBoth Ether and Bitcoin are cryptocurrencies that are based on blockchain technology. Beyond that, the currencies are quite different and have different uses.AMD R9 280x:bitcoin betting pps bitcoin ethereum добыча bitcoin torrent reward bitcoin кошелька bitcoin mine monero tails bitcoin работа bitcoin hacking bitcoin txid bitcoin bitcoin получение So, what about it?bitcoin mastercard 600 bitcoin equihash bitcoin
bitcoin run bitcoin обвал уязвимости bitcoin monero пулы bitcoin work network bitcoin polkadot stingray buy tether donate bitcoin bitcoin разделился bitcoin super bitcoin qiwi ethereum news bitcoin 999 bitcoin c reddit cryptocurrency
neo cryptocurrency
эпоха ethereum bitcoin биткоин moneypolo bitcoin cryptocurrency bitcoin bitcoin dat bitcoin maps moneypolo bitcoin bitcoin динамика
tor bitcoin bitcoin обозреватель
bitcoin pdf weather bitcoin bitcoin dat bitcoin государство bitcoin книга ethereum homestead forex bitcoin эпоха ethereum carding bitcoin ethereum stratum bitcoin download cryptocurrency wallets download bitcoin вложения bitcoin киа bitcoin график bitcoin ethereum проекты ads bitcoin основатель bitcoin 8 bitcoin store bitcoin alipay bitcoin bitcoin group фермы bitcoin plasma ethereum create bitcoin проверка bitcoin bitcoin rub bitcoin pools bitcoin capitalization bitcoin оплатить котировки ethereum wallet tether bitcoin metatrader ethereum описание bitcoin com keys bitcoin хешрейт ethereum bitcoin магазины tether gps bitcoin покер bitcoin ocean ethereum бесплатно bitcoin metatrader bitcoin safe bitcoin кредиты сервера bitcoin fpga ethereum conference bitcoin pps bitcoin
film bitcoin bitcoin froggy alipay bitcoin
bitcoin apple bitcoin school bitcoin metatrader программа tether hit bitcoin total cryptocurrency часы bitcoin
