nyuuzyou/wikis huggingface dataset:
MailGhost

www.mail-ghost.com offers UK private mailboxes with Anonymous Mail Forwarding services. Once registered, mailbox owners can send and receive mail through their mailbox address; perfect for Ebay/Amazon sellers, small businesses, conveying a presence in the UK, concealing your location, cam-girls, privacy-seekers, pranks, etc.
Located in the heart of Europe’s Oil Capital [1], MailGhost offer a prestigious address [2], particularly useful for those engaged in the oil & gas, and engineering industries. 
MailGhost is set apart from competitors, not only as one of the lowest priced mailbox services in the UK, but by the extent of services included in the price. This is reinforced by a 30-day Free Trial, 2 minute registration process, instant mailbox activation, and a variety of cryptocurrency and fiat payment methods welcomed. Mailbox owners are always in control with secure online account management.thumb|MailGhost logo thumb|Aberdeen, Europe’s Oil Capital
==Mailbox Rental==
Currently, MailGhost offers six and 12 month UK mailbox rentals to individuals and businesses, with a variety of mail forwarding services and bespoke logistics. Potential mailbox owners can try a 30-day free trial.
==Postage Costs and Handling Fees==
MailGhost charge a fixed mailbox rental, plus a small handling fee per item forwarded. Part of the initial cost is deposited into a mailbox account, from which all postage costs and handling fees are deducted.
==Privacy and Security==
* Secure payments via trusted payment processors
* Segregation of employee duties coupled with and staff monitoring
* Off-site storage facility with restricted access and CCTV 24/7
* Mail is covered by insurance while awaiting forwarding
==Customer Relations==
* FAQs: www.mail-ghost.com/faqs/
* E-mail: info@mail-ghost.com
* Twitter: 
* Facebook: 
* Google+: 
==External Links==
* Official Website: MailGhost 
* www.mail-ghost.com/faqs/
* Mail Forwarding on Wikipedia
==References==
[1] http://news.bbc.co.uk/1/hi/business/3236703.stm 
[2] http://www.theguardian.com/news/datablog/interactive/2012/sep/13/money-uk-multi-millionaires-regional-breakdown
 Category:Local
 Category:Services
 Category:Ecommerce
Majority attack

A majority attack (usually labeled 51% attack or >50% attack) is an attack on the network. This attack has a chance to work even if the merchant waits for some confirmations, but requires extremely high relative hashrate.
The attacker submits to the merchant/network a transaction which pays the merchant, while privately mining a blockchain fork in which a double-spending transaction is included instead. After waiting for n confirmations, the merchant sends the product. If the attacker happened to find more than n blocks at this point, he releases his fork and regains his coins; otherwise, he can try to continue extending his fork with the hope of being able to catch up with the network. If he never manages to do this, the attack fails, the payment to the merchant will go through, and the work done mining will also go to waste, as any new bitcoins would be overwritten by the longest chain.
The probability of success is a function of the attacker's hashrate (as a proportion of the total network hashrate) and the number of confirmations the merchant waits for. For example, if the attacker controls 10% of the network hashrate but the merchant waits for 6 confirmations, the success probability is on the order of 0.1%. If the attacker controls more than half of the network hashrate, this has a probability of 100% to succeed. Since the attacker can generate blocks faster than the rest of the network, he can simply persevere with his private fork until it becomes longer than the branch built by the honest network, from whatever disadvantage.
No amount of confirmations can prevent this attack; however, waiting for confirmations does increase the aggregate resource cost of performing the attack, which could make it unprofitable or delay it long enough for the circumstances to change or slower-acting synchronization methods to kick in. A majority attack was more feasible in the past when most transactions were worth significantly more than the block reward and when the network hashrate was much lower and prone to reorganization with the advent of new mining technologies.
A majority attack has never been successfully executed on the Bitcoin network, but it has been demonstrated to work on some small altcoins.
See also: Weaknesses#Attacker_has_a_lot_of_computing_power
==See Also==
* Attack success probability calculator
* Irreversible_Transactions
Category:Technical
Category:Attack vectors
Malware

=List of known Bitcoin-related malware=
==Wallet-stealing malware==
# Infostealer.Coinbit - targets Windows machines, looks for wallet.dat. Probably the first Bitcoin-related virus.
==Mining malware==
# DevilRobber Trojan - targets Mac machines, mines Bitcoins, does a lot of other non-Bitcoin related malicious acts.
==Other Malware==
# BKDR_BTMINE.DDOS - targets Windows machines, launches DDoS attacks on miners.
Manaty

Manaty is a French based freelance software development company created in 2006, specialized in Business System Solutions (BSS) software, mainly for the telecom industry.
Manaty represents an international team of highly-skilled and devoted developers, architects, project leaders and testers deployed in 8 countries all over the world (France, Lithuania, USA, Morocco, Malaysia, Philippines, China, Argentina). The freelance working model allows for an ability to operate 24/7 internationally and to create cost-efficient, high-quality BSS software.
New Product:
* MEVEO - Event-based Billing System (Open source, web-based)
:* Modules: Catalog Management, Users and Accounts Management, Back Office, Self Care, Mediation, Rating, Billing, Invoicing, ...
Products:
* MVNO BSS Platform
* M2M BSS Platform
* E-commerce Platform
* Custom Development (JAVA, .NET, PHP, C/C++, mobile, FLEX)
More information
Mang Sweeney

A exchange site, operated by Mang Sweeney in the Philippines, where bitcoins may be bought or sold.
This service is useful for using bitcoins to send remittance payments to the Philippines.
The price at which the bitcoins are bought or sold is established at the time the order is placed.
Languages: English, Filipino
==Buying Bitcoins==
The options for paying for the Bitcoin purchase are:
* PHP - Cash deposit at a Philippine bank
* PHP - Cash, local trade in Metro Manilla
==Selling Bitcoins==
The options for receiving the proceeds from the sale of bitcoins are:
* PHP - Cash deposited into recipient's account at a Philippine bank 
* PHP - Cash, pickup at local branch of suggested remittance centers:
** MLhuillier
** Cebuana Lhuillier
** LBC
==History==
The service was launched June 18, 2012Mang Sweeney's: send money to the Philippines through bitcoin. As of August 29, 2012 this remains the only exchange offering service in the Philippines.
==See Also==
* Buying bitcoins
* Selling bitcoins
==External Links==
* Mang Sweeney Exchange forum thread
* PinoyMoney post on bitcoin
==References==
Category:Defunct exchanges
MapOfCoins.com

Mapofcoins.com is a website that uses interactive infographics that show which cryptocoins are currently in existence and trace the history of their appearance back up to 2008. You can also access a short description of Bitcoin and all the forks by clicking the circle that symbolizes a particular coin. There's also an option to download a picture of selected time period.
== See also ==
* Bitcoin history
* Forks
* Satoshi Nakamoto
== References ==
: MapOfCoins
ru:Mapofcoins.com
Marchenko Ltd

Sold contracts for purchasing mining rig capacity. The service was offered by community member Vladimir.
The contracts were first offered beginning January 20, 2011selling contracts. The operator had previously offered a to miners a service where mining rigs could be managed by the operator remotely.
==ASIC hardware==
On April 4th, 2012, the owner of DeepBit announced plans for a custom Bitcoin mining ASIC.https://bitcointalk.org/index.php?topic=75298. Although details were supposed to be made available in the first issue of Bitcoin Magazine no such information surfaced therein or in subsequent issues.https://bitcointalk.org/index.php?topic=75298.msg834868#msg834868 On July 12th, 2012, cancellation of the project was mentioned, citing a negative financial outlook.https://bitcointalk.org/index.php?topic=88331.msg1025900#msg1025900
==External Links==
* selling contracts forum thread 
==References==
Mario J. Lucero

Mario J. Lucero, is the cofounder and CEO of Heaven Sent Gaming alongside his high-school sweetheart Isabel Ruiz, and Bitcoin evangelist.
He developed a well-recieved early Bitcoin pseudogame/website, called BitcoinDonatehttps://bitcointalk.org/index.php?topic=51719.0, which encouraged donations to charities and worthy causes such as the Red Cross and OpenStreetMaps. Also he took part in operating crytpo-donation web platformhttps://btc4hunger.com/ for several hunger fighting charities.
==See also==
*https://www.linkedin.com/in/mariojlucero
*http://www.comicvine.com/mario-j-lucero/4040-81994/
*http://www.imdb.com/name/nm6584854/
*http://www.conservapedia.com/Mario_J._Lucero
==References==
Category:people
Mark T. Williams

Mark T. Williams, better known in the Bitcoin community as Professor Bitcorn, is a Boston University faculty member. In 2013 Williams predicted that bitcoin "could" trade for less than 10 dollars by mid-2014,http://www.businessinsider.com/williams-bitcoin-meltdown-10-2013-12 and provided testimony before the New York State Department of Financial Services hearing on virtual currencies. During the February 10, 2014 flash crash, the value of bitcoin dropped by over 80 percent, to a low of $102 before rising to over $600. The low in this crash was still an order of magnitude higher than Williams's prediction. He raised concerns about Bitcoin including it being a high-risk virtual commodity, having artificially inflated price, extreme hoarding, hyped demand, high potential for market manipulation, and need for strong regulation.Testimony of Mark T. Williams The New York State Department of Financial Services: Hearing on Virtual Currencies - January 29, 2014.Panel 3: The Academic View on Virtual Currencies The New York State Department of Financial Services: Hearing on Virtual Currencies - January 29, 2014. On April 2, 2014, Williams provided congressional testimony before the U.S. House of Representatives Committee on Small Business discussing the 10 major risks associated with Bitcoin. House Committee on Small Business: Committee Explores Risks and Benefits of Bitcoin Use by Small Businesses The Bitcoin community remains critical of his concerns, and usually refers to him as "Professor Bitcorn." Williams also continues to assert that the virtual currency is in a hyper bubble and will eventually suffer a price collapse.
==References==
Category:Skeptics
Mastering Bitcoin

Mastering Bitcoin by Andreas M. Antonopoulos is a freely-available book on Bitcoin published in 2015 by O'Reilly Media.
Mastering Bitcoin is a digital currency best sellerhttps://www.amazon.com/Best-Sellers-Books-Digital-Currencies/zgbs/books/10806607011 and has been translated by volunteers into more than 10 languages. The second edition added 30% more content covering topics such as SegWit, SIGHASH types and the Lightning Network (Chapters 6 and 7). The book has been completely written on GitHub from day one with contributions from 114 individuals https://github.com/bitcoinbook/bitcoinbook/graphs/contributors mirroring the open, collaborative model of Bitcoin development itself.
Category:Educational
==See Also==
Bitcoin.org Developer Documentation
*Mastering Bitcoin from O'Reilly (DRM-free book; May 2015 edition):
**EPUB format
**PDF format
*Mastering Bitcoin: Programming the Open Blockchain from O'Reilly (DRM-free EPUB; June 2017, 2nd edition)
*GitHub page
*Author's book page
==References==
Maximum transaction rate

The maximum transaction rate is the block size limit divided by the average transaction size. The block size limit is well known, 1MB, however the average transaction size isn't. Here we'll look at what influences that size.
The minimum sized transaction typeEven smaller transactions can be made by using empty scriptPubKeys, however such transactions are not secure because anyone can spend them. is the OP_CHECKSIG transaction:
 scriptPubKey: <33 byte compressed pubKey> OP_CHECKSIG
 scriptSig: <72 byte signature>
Each transaction input requires at least 41 bytes for the previous transaction reference and other headers and each transaction output requires an additional 9 bytes of headers. Finally every transaction has a header at least 10 bytes long. Added up we get 166 bytes for the minimum-sized Bitcoin transaction. For 1MB (1,000,000 byte) blocks this implies a theoretical maximum rate of 10tx/s.
However change complicates the situation. It isn't always possible for a client to find a transaction input of the size required. Thus client software will included additional outputs to themselves for the change, and similarly they will include additional inputs to collect change outputs together when no one output is large enough.
Users with large wallets, in particular eWallets such as Instawallet or large exchanges like Mt. Gox are most likely to be able to find transaction outputs of a suitable size for any given payment. It's conceivable that if transaction fees are high enough in the future users who trust each other may get together to use each others wallets to make payments as a way to avoid transaction fees, with the balances settled periodically by some other means.
== Trust-free Combining ==
Users can also combine their transactions to make them slightly smaller, and possibly improve privacy. A transaction is invalid until every transaction input is signed for, thus multiple users can create a joint transaction with no risk of their funds being stolen. This reduces average transaction size by 10 bytes, the size of the per-transaction header. Using this technique aggressively results in 156 byte average transactions, or 10.7tx/s.
== Lower-bound transaction rate ==
A reasonable, conservative, assumption is to assume that every transaction requires two outputs, including change, and two inputs, consuming change. Assuming that trust-free combining is not used gives us 322 byte transactions, or 5.2tx/s.
Actual real-world rates will likely be somewhere between those numbers, although equally rates may be less as well if multi-signature transactions are become popular; the figure 7tx/s is commonly quoted as a 'ball-park' approximation in discussions of the blocksize limit.
== The Bitcoin system vs. the Bitcoin blockchain ==
Numbers discussed here apply to the bitcoin blockchain and are no hard limits to the bitcoin system in a broader sense. Off chain transactions, most notably transaction channels allow arbitrary transaction rates with instant, off the chain (added privacy), secure micro-transactions.
== Footnotes ==
McxNOW

McxNOW was a digital currency exchange allowing trading of bitcoin and altcoin digital currencies.
The site will be going into a maintenance period beginning November 15 2014, which according to the site operator will take several weeks and destroy any coins that are not withdrawn by that date. Wallet data will also be deletedmcxNOW Exchange.
==Features==
* Written entirely in C++ for speed and response.mcxNOW Exchange.
* No internet access to database for security.
* 25% of all mcxNOW exchange fees go towards paying interest on deposits every 6 hours. No trading is required to earn interest paymentsmcxNOW Exchange Features and FAQ.
===Trading===
====Fixed-point integer math trading engine====
mcxNOW uses integers through the entire trade pipeline to ensure you aren't losing out and get precise results.
====Anonymous Trading====
No personal identification required.
====Currency pairs====
* BTC/LTC
* BTC/MNV
* BTC/DVC
* BTC/WDC
* BTC/CL
* BTC/XPM
* BTC/SC
* BTC/PPC
* BTC/FTC
====Trading Fees====
There is a 0.2% fee for each side of every trade, so 0.2% for the buyer (BTC fee) and 0.2% for the seller (altcoin fee).
===Deposits===
====Deposit Fees====
There are no fees on bitcoin or alt-coin deposits.
====Deposit Options====
You may deposit any of the following:
*Bitcoin
*Litecoin
*PrimeCoin
*PeerCoin
*Feathercoin
*MinCoin
*SolidCoin
*Devcoin
*WorldCoin
*CopperLark
===Withdraws===
====Withdraw Options and Fees====
*Bitcoin (Withdrawal Fee: 0.001BTC)
*Litecoin (Withdrawal Fee: 0.02LTC)
*PrimeCoin (Withdrawal Fee: 0.1MNC)
*PeerCoin (Withdrawal Fee: 0.1PPC)
*Feathercoin (Withdrawal Fee: 0.1FTC)
*MinCoin (Withdrawal Fee: 0.1MNC)
*SolidCoin (Withdrawal Fee: 0.4SC)
*Devcoin (Withdrawal Fee: 50.0DVC)
*WorldCoin (Withdrawal Fee: 0.4WDC)
*CopperLark (Withdrawal Fee: 0.4CL)
==References==
Category:Defunct exchanges
Category:EWallets
Mcxnow

#REDIRECT mcxNOW
A digital currency exchange allowing trading of bitcoin and alt-coin digital currencies.
==Features==
*Written entirely in C++ for speed and response.mcxNOW Exchange
*No internet access to database for security.
===Trading===
====Interest on deposits====
25% of all mcxNOW exchange fees go towards paying interest on deposits every 6 hours. No trading required to earn interest payments.mcxNOW Exchange Features and FAQ 
====Fixed-point integer math trading engine====
mcxNOW uses integers through the entire trade pipeline to ensure you aren't losing out and get precise results.
====Anonymous Trading====
No personal identification required.
====Currency pairs====
* BTC/LTC
* BTC/MNV
* BTC/DVC
* BTC/WDC
* BTC/CL
* BTC/XPM
* BTC/SC
* BTC/PPC
* BTC/FTC
====Trading Fees====
There is a 0.2% fee for each side of every trade, so 0.2% for the buyer (BTC fee) and 0.2% for the seller (altcoin fee).
===Deposits===
====Deposit Fees====
There are no fees on bitcoin or alt-coin deposits.
====Deposit Option====
You may deposit any of the following:
*Bitcoin
*Litecoin
*PrimeCoin
*PeerCoin
*Feathercoin
*MinCoin
*SolidCoin
*Devcoin
*WorldCoin
*CopperLark
===Withdraws===
====Withdraw Options and Fees====
*Bitcoin (Withdrawal Fee: 0.001BTC)
*Litecoin (Withdrawal Fee: 0.02LTC)
*PrimeCoin (Withdrawal Fee: 0.1MNC)
*PeerCoin (Withdrawal Fee: 0.1PPC)
*Feathercoin (Withdrawal Fee: 0.1FTC)
*MinCoin (Withdrawal Fee: 0.1MNC)
*SolidCoin (Withdrawal Fee: 0.4SC)
*Devcoin (Withdrawal Fee: 50.0DVC)
*WorldCoin (Withdrawal Fee: 0.4WDC)
*CopperLark (Withdrawal Fee: 0.4CL)
==References==
MegaChange.is

== About the company ==
Founded in 2015, MegaChange.is is an easy-to-use exchange platform supporting all major electronic currencies, including Bitcoin, and erases the boundaries between electronic payment systems. 
The mission of the company is to provide a convenient and fast platform for electronic currency exchange, make money available in every country of the world and offer currency exchange services of ultimate quality. 
== History == 
MegaChange.is launched in 2015.
Since 2015, MegaChange.is supports SEPA/SWIFT transfers to banks around the world, withdrawal to PayPal and secure storage of banking details and purse numbers of its members online.
In September 2015, MegaChange.is made a major update of its website. The update introduces a number of useful features aimed at improving user experience and offering better, more convenient access to the site's services.
==Supported currencies==
Currencies: USD, EUR, RUB, CNY
==Fees and rates==
The fees and exchange rates are changing and the best option is to check it on the site. 
Actual fees: www.MegaChange.is/rates/
Actual exchange rate: www.MegaChange.is
==Cumulative discount program==
Registered users are entitled to a progressive discount based on the total amount of funds exchanged through the service and applied to the service commission. 
Service provides 4 account levels. The higher the client’s account level is, the more discount they will get. When the client's cumulative transaction amount reaches the required amount, their account will be upgraded to a high level automatically. In addition, in a future transaction, the client will get a discount of a new level.
==Affiliate program up to 30% from commissions==
MegaChange.is offers an easy and transparent referrer system for partners. Every registered user can participate in the affiliate program. Up to 30% from the service’s fee of referred exchange.
==Limits and Restrictions==
Please note that Bitcoin may take some time to confirm your payment. After it is confirmed, the exchange will be completed automatically. We do not accept registrations from individuals or companies based in the United States of the America. This includes US citizens residing overseas. If you fall under the above mentioned category or you are a US resident, please do not register an account with us or place any kind of exchange at all. We apologize for any inconvenience caused.
A full list of the rules and restrictions is available here: www.MegaChange.is/terms-of-service.aspx
==External links==
MegaChange.is exchanger
Affiliate Program - You will be earn from 5% to 30% of the amount of any exchange operation performed by the user!
User registration
Discount program
==References==
Category:Exchanges
Category:Properties established in 2014
Category:USD exchanges
Category:EUR exchanges
Category:GBP exchanges
Category:RUB exchanges
Mengmengbi

== Mengmenbi (萌萌币) ==
Mengmengbi (萌萌币) is a trading platform for buying and selling Bitcoin in CNY currencies. Mengmengbi is powered by ANX. The trading engine is built upon the LMAX Disruptor technology used by banks for their foreign currency exchange (FX) trading. The engine was designed to handle high volume, high throughput, and low latency trading.
== Advantages ==
 
•	Powered by ANX
•	Zero Trading Fees
•	Instant processing of CNY deposits
•	Near realtime processing of CNY withdraways (Mon-Fri)
•	Gox compatible Trading API with BTC, altcoin support
•	Support Bitcoin and altcoins
•	Zero bank transfer fees
•	Shared liquidity with ANX, one of the top 10 Bitcoin exchanges in the world
•	Multilingual support (English, Traditional Chinese, Simplified Chinese).
== Security ==
•	Support Two-Factor Authentication greatly reducing online identity theft.
•	Mengmengbi is using an industry leading service provider for DDOS protection and our servers are hosted in a Tier 3+ ISO 27001/9001 compliant datacentre.
•	Mengmengbi supports two-factor authentication in addition to email verification for all crypto withdrawals.
•	Mengmengbi does not run a fractural reserve. All customer funds segregated and accounted for.
Category:Defunct exchanges
MercaBit.eu

A exchange site where bitcoins may be bought using cash transfer methods UKash (EUR), HalCash (Hal-Cash) (EUR) and Neteller instant money transfers (EUR). More recently you can exchange your bitcoins for ukash vouchers.
The price at which the bitcoins are bought is relative to the BTC/EUR market rate at the leading exchange.
There may be restrictions when attempting to redeem UKash (EUR) vouchers from one country with a merchant in another. This includes GermanyCurrency conversion is not possible, some vouchers from Brazil and possibly elsewhere as well.
The service is attended to during weekday business hours, Central European Time (CET).
==History==
The service was revealed on August 2, 2012Buy bitcoins with ukash on mercabit.eu.
==See Also==
* Buying bitcoins
* Selling bitcoins
==External Links==
* mercaBit.eu website
* mercaBit.eu feedback thread
==References==
Category:Defunct exchanges