Bitcoin Wiki - User contributions [en]

Ways to store Bitcoins

2014-07-11T18:26:18Z

TimS: safety deposit -> safe deposit

The following is a list of different ways to store Bitcoins.

==On your computer with the Bitcoin software==
* '''Pro:''' Simple to understand, and the coins are easy to spend.
* '''Con:''' The Bitcoin software is not user friendly, takes a long time (hours to days) to download the block chain, and occasionally has issues that are difficult for non-advanced users to recover from.
* '''Con:''' Maximum vulnerability to malware and hackers. Your coins can be stolen if your computer is compromised.

If you store Bitcoins on a computer, make sure you take regular backups of the [[Wallet|wallet.dat]] file. This is the file that contains your [[private keys]]. Loss of this file will result in the permanent loss of your balance.

==On removable media==
You can store Bitcoins on removable media, including USB flash drives and CD-R's. These can then be kept in drawers, safes, safe deposit boxes, etc.

Storing Bitcoins on removable media is done by saving a copy of the [[Wallet|wallet.dat]] file, and then removing it from the computer. This should be done with the Bitcoin software completely shut down. Because removable media can fail, it is advisable to keep any significant balance on two different pieces of media (e.g. two different USB flash drives).

* '''Pro:''' When Bitcoins are saved on removable media and completely removed from online computers, and no one has a copy of the file, the risk that they can be stolen is eliminated.
* '''Pro:''' Relatively simple for majority of computer users.
* '''Con:''' Requires use of the Bitcoin client, with its associated drawbacks (hours/days to download block chain, etc.)
* '''Con:''' Not user friendly for average non-technical computer users. The location of the wallet.dat file is in a folder that is normally hidden to Windows users, and restoring it requires a command line option that is difficult for novices to figure out.

Important: If a wallet is restored from removable media and then is partially spent, it is important to take a new backup. This is because some of the unspent portion is sent to a newly generated "change" address, whose [[private key]] under some rare circumstances might be a newly generated one, not present in the original backup. If a new backup is not taken and the wallet.dat containing that new key is later lost, part or all of the unspent balance can be lost with it.

==On a third party website==
Bitcoins can be stored on exchanges and other websites that allow deposits and withdrawals of balances. Even if not designed for this, websites that allow withdrawals to any Bitcoin address can be used to make payments, because you can always do a withdrawal to somebody else's address, which is functionally identical to making a payment to that address yourself.
* '''Pro:''' Simple to understand and use.
* '''Pro:''' No software needed, no blockchain to download.
* '''Pro:''' Bitcoins can be accessed from mobile devices.
* '''Con:''' Coins can be stolen by the website operator with little to no effective recourse.
* '''Con:''' Coins can be stolen or irreversibly destroyed if the website operator gets hacked or fails to take appropriate precautions (such as regular backups)
* '''Con:''' Coins can be stolen if your account password is compromised (such as via keyloggers or "phishing" attacks).

In summary, third party websites are generally good for storing small amounts of bitcoins that you want to access quickly. But because of the multiple ways they can be stolen, they are not a good way to store significant balances you cannot afford to lose.

==On a paper wallet or bank card==
Bitcoins can be stored on [[paper wallet]]s or [[Bitcoin bank card]]s - which essentially the same thing, just made out of different materials. A paper wallet is a sheet of paper upon which [[private keys]] and Bitcoin addresses have been printed. You give out the Bitcoin addresses and receive bitcoins. A bank card is a pre-printed card with a single Bitcoin address and private key - often provided with a separate carrying card that only has the Bitcoin address.

In order to spend the bitcoins, the private key must be imported into a Bitcoin client or entered into a website that accepts deposits via private keys.

You can create your own paper wallets with open-source software, see the [[paper wallet]]s article for details. Engraved metal bank cards can be obtained from [[BitBills]]. Pre-made paper wallets by Casascius can be obtained at the same online store as [[Casascius physical bitcoins]].

* '''Pro:''' Very secure. If a paper wallet is created securely, the bitcoins cannot be remotely stolen or hacked.
* '''Con:''' No easy way yet for novices or average computer users to import the keys. Users must manipulate their wallet file with [[pywallet]] or use a copy of the Bitcoin software with a special patch applied. No web sites are known to accept Bitcoin private keys yet.
* '''Con:''' If you acquire a paper wallet or bank card from a third party, they will have had access to the [[private key]]. Ensure you trust or have recourse against the manufacturer.

==On a bearer item==
Bitcoins can be stored on bearer items, which include [[BitBills]] and [[physical bitcoins]]. Bearer items are functionally identical to paper wallets, their only difference being that the private key is embedded in some object that must be torn open in order to gain access to it.

* '''Pro:''' If manufactured with appropriate controls, they are completely immune to hackers and remote theft.
* '''Pro:''' They can be understood by people completely unfamiliar with the virtual currency or how it works, including non-technical people and senior citizens. In physical form, they function much like cash or gold.
* '''Pro:''' They are often appealing as collectibles.
* '''Con:''' They are not very portable. They have to be broken to spend the Bitcoins in any transaction that's not face-to-face.
* '''Con:''' They almost always cost a premium that exceeds their face value.
* '''Con:''' The manufacturer of the bearer item had access to the private key to produce the item, and therefore could steal the balance. The keys could also be stolen from the manufacturer if all copies other than the one placed in the item weren't properly destroyed. Ensure you trust or have recourse against the manufacturer.
* '''Con:''' Depending on their complexity, they could be counterfeited. Counterfeits would have zero Bitcoin value, or would be made with multiple copies of the same private key, all of which would appear to have value when checked online but only one of which could be spent.

[[Category:Instructional]]

Cold storage

2014-07-11T18:26:16Z

TimS: safety deposit -> safe deposit

'''Cold storage''' in the context of Bitcoin refers to keeping a reserve of Bitcoins offline.

For example, a Bitcoin exchange typically offers an instant withdrawal feature, and might be a steward over hundreds of thousands of Bitcoins. To minimize the possibility that an intruder could steal the entire reserve in a security breach, the operator of the website follows a best practice by keeping the majority of the reserve in ''cold storage'', or in other words, not present on the web server or any other computer. The only amount kept on the server is the amount needed to cover anticipated withdrawals.

Methods of cold storage include keeping bitcoins:
* On a USB drive or other data storage medium in a safe place (e.g. safe deposit box, safe)
* On a [[paper wallet]]
* On a bearer item such as a [[physical bitcoin]].
* Online, but on encrypted media where the encryption key is offline.
* Use a offline Bitcoin [[Hardware wallet]] (So far only [http://www.pi-wallet.com/products/pi-wallet Pi-Wallet] is operational.)

'''Deep cold storage''' refers to keeping a reserve of Bitcoins offline, using a method that makes retrieving coins from storage significantly more difficult than sending them there. This could be done for safety's sake, such as to prevent theft or robbery.

Because Bitcoins can be sent to a wallet by anyone knowing the wallet address, it is trivial to put a wallet in cold storage but to keep a copy of the addresses needed to send funds to it.

A simple example of deep cold storage is opening a safe deposit box and putting a USB stick containing an encrypted wallet file in it. The public (sending) addresses can be used any time to send additional bitcoins to the wallet, but spending the bitcoins would require physical access to the box (in addition to knowledge of the encryption password).

Deep cold storage would typically be used for holding large amounts of bitcoins, or for a trustee holding bitcoins on behalf of others. In such a case, additional precautions should be taken beyond a simple example of a single safe deposit box.
* The box could be accessed by bank or maintenance personnel, so the contents of the box alone should not be sufficient to access the wallet.
* The box could be stolen or destroyed in a disaster, or the media could become unreadable, so the box should not contain the only copy of the wallet.
* The trustee could die or become incapacitated. If access to the wallet or knowledge of its location is lost, or encryption passwords are lost, the bitcoins are gone forever. Provisions should be made so that the box can be accessed by someone else as appropriate, including any encryption passwords.

== See also ==
* [[How to import private keys]]
* [[How to set up a secure offline savings wallet]]
* [http://codinginmysleep.com/bitcoin-cold-storage-in-plain-english Bitcoin Cold Storage In Plain English] by David Perry
* [https://blockchain.info/wallet/paper-tutorial Paper Wallet Tutorial] blockchain.info
* [http://www.offlineaddress.com/?site=about#security-risk Security of private key] offlineaddress.com
[[Category:Introduction]]
[[Category:Security]]

How to set up a secure offline savings wallet

2014-07-11T18:26:11Z

TimS: safety deposit -> safe deposit

== Why set up an offline savings wallet? ==

Modern operating systems are getting more and more complex. The flip side of all this complexity is that they generally have a large [http://en.wikipedia.org/wiki/Attack_surface attack surface] and constantly leak information without the user’s knowledge or consent. No matter how many precautions you take, your [[wallet]]s will never be 100% safe on a computer that is connected to the internet.
Because bitcoins are stored directly on your computer and because they are real money, the motivation for sophisticated and targeted attacks against your system is higher than in the pre-bitcoin era, when only large organizations normally had to worry about such attacks.

The bitcoin ecosystem is still very young and unfortunately not many user friendly and highly secure wallets have been developed yet.
Today these two ways are best to secure your bitcoins against theft:

1. using a [[hardware wallet]] such as [[TREZOR]] that has basically two functions - it keeps your bitcoins in an offline storage and when connected to a computer, it enables a highly secure way of spending as well (immune to viruses, hackers and keyloggers).

2. creating an offline [[cold storage]] which is useful for storing bitcoins, but has its limitations and security risks when you decide to spend the coins

This guide will instruct you on how to create an offline wallet, a wallet that never even touches the internet in its plaintext form. This security measure is also referred to as being an air gap. For all practical purposes, this wallet is safe from all online threats, such as viruses and hackers. It is however still exposed to offline threats, such as [http://en.wikipedia.org/wiki/Hardware_keylogger hardware keyloggers], extortion, or people looking over your shoulder.

The below procedure may seem tedious, but remember that security almost always comes at the cost of convenience. When you deposit money at a bank, you let them worry about security. Bitcoins, however, are stored on '''your''' computer and that means '''you''' are fully responsible for securing them.

== How to deposit funds ==

# Set up a [http://www.wuala.com/en/bitcoin Wuala] account, or other cloud backup service of your choice.
# Create a strong and unique password offline (manually). This password should be at least 20 characters long; it should contain numbers, upper and lower case letters, and symbols. It should be as random as possible, ie it should look something like this: Zr%8qL03&cvwS9@05AatdP71. Never use this password elsewhere.
# '''Do not forget this password'''. Recite it several times a day. It is easy to overestimate your ability to remember a password several months in the future. To be on the safe side, write it down and store the piece of paper in a safe deposit box.
# Download [http://www.bitcoin.org/ Bitcoin Linux binary] and save it on a USB drive.
# Shut down your computer, and boot [http://www.ubuntu.com/ Ubuntu] (or Linux distribution of you choice) from a [http://www.ubuntu.com/download/ubuntu/download liveCD]. This will not affect your current operating system.
# '''Disconnect machine from the internet'''. Unplug any network cables and disable wireless. Verify that wireless is disabled in the icon on the upper right corner (Ubuntu). Double check that machine is disconnected by opening the web browser.
# Run bitcoin while disconnected to the internet. The client will show 0 connections and 0 blocks, but it will still generate a wallet.dat file and a bitcoin address.
# Encrypt your wallet using the strong and unique password from step 2 above. (Bitcoin Client > Settings > Encrypt wallet)
# Copy wallet.dat (found in hidden folder .bitcoin in your home directory) to USB drive.
# Save bitcoin address to a text file and copy it to USB drive.
# Shut down system and turn off computer. Before switching your computer on again, remove all power sources for about 1 minute. Physically remove battery from laptop.
# Backup encrypted wallet.dat file in several places:
#*Send it to your 5 best friends by email attachment and ask them to save it for you.
#*Save it on your Wuala account created in step 1.
#*Save it on several USB drives and CDs and store them in different geographic locations.
#Send bitcoins to the address saved on the USB drive. Double check in the [[Bitcoin Block Explorer|block explorer]] that they have been sent.

==How to retrieve funds ==

#Boot from Ubuntu liveCD, as in step 5 above.
#Insert USB drive.
#Run bitcoin client and close it again.
#Replace wallet.dat in ~/.bitcoin directory with wallet.dat from USB drive.
#Connect to the internet.
#Restart bitcoin client.
#Wait for blocks to download (optional).
#Send bitcoins.

==Notes==

*This procedure is only secure if you perform steps 1-13 in this '''exact order'''.

*If you're a non-technical user that can't perform the steps above, use an [[Paper wallet|in-browser paper wallet generator]] to create paper wallets (read below for more caveats and info).

*Perform one or two trial runs of the above procedure with a few bitcents, and make sure that you know how to successfully retrieve them, before making a bulk transfer.

*Every time you retrieve bitcoins from your savings wallet, create a fresh savings wallet by repeating the above procedure, and send all your remaining savings balance there.

*There is more than one way to do it. Similar procedures have been suggested on the forums [http://forum.bitcoin.org/index.php?topic=17240.0 here] and [http://forum.bitcoin.org/?topic=5194.0 here].

*Beware that even savings wallets have limited lifetimes. New, backwards incompatible versions of bitcoin might come out in future, [http://en.wikipedia.org/wiki/Advanced_Encryption_Standard AES] might be broken, [http://en.wikipedia.org/wiki/Bit_rot bit rot] might destroy your wallets, etc. Pay attention to updates in the Bitcoin world and update to fresh savings wallets every couple of years, or as needed.

* See [[How to import private keys]] for an alternative way of retrieve your coins.

==Alternatives ==

[[Paper wallet|'''Paper wallets''']] can also be used to create offline bitcoin savings accounts. While paper wallets are much easier to generate, they are not generally encrypted which means you cannot guard against accidental loss by distributing copies to online services and friends. Instead, paper wallets must be kept safe like jewels or cash. Looking forward, support for [[BIP 0038|BIP-38]] encryption is growing fast and it is expected that paper wallet generators will soon include options for generating ''encrypted paper wallets'' that can be duplicated and widely distributed for safekeeping.

==See Also==

* [[Cold storage]]
* [http://codinginmysleep.com/bitcoin-cold-storage-in-plain-english Bitcoin Cold Storage In Plain English] by David Perry

[[Category:Instructional]]
[[Category:Security]]

User talk:Bronsonmilgard

2014-06-12T12:07:42Z

TimS: /* ghash.in */ new section

== ghash.in ==

What is ghash.in? I'm assuming it's some impostor website, so I've removed the links. If you can defend your actions, do so. Otherwise, I expect you'll be banned in short order. --[[User:TimS|TimS]] ([[User talk:TimS|talk]]) 12:07, 12 June 2014 (UTC)

GHash.IO

2014-06-12T12:05:15Z

TimS: Undo revision 48128 by Bronsonmilgard (talk) (he changed links to ghash.in, which I assume is an impostor)

{{outdated}}{{infobox company|name=GHash.IO|image=[[File:Ghash.png|235px]]
|trading_name=GHash.IO
|industry=[[Mining Pool]]
|foundation=July 2013
|hashrate=39 Phash/s
|website=https://ghash.io
}}
'GHash.IO' is one of the largest Bitcoin mining pools, which entered the mining market in July 2013 and contributes to over 30% of the overall hashing power making it the #1 pool in the Bitcoin network. The company frequently adds new features and expands trading possibilities. In March 2014, GHash.IO introduced the new scrypt mining features and added a number of altcoins available for mining such as LTC, DOGE, FTR and AUR. In April 2014, the mining pool launched GHash.IO Multipool Pro, which gave users the possibility to mine the most profitable coins with the help of new settings such as the conversion and the switch settings. GHash.IO charges 0% pool fee and provides 24/7 technical support for its users.

{| class="wikitable"
| Type
| Mining Pool
|-
| Founded
| July 1, 2013
|-
| Headquarters
| Netherlands
|-
| Rewards
| Pay Per Last N Shares (PPLNS)
|-
| Website
| [https://ghash.io/ ghash.io]
|}

==Mining Options==

{| class="wikitable" style="text-align: center; color: green;"
| Options
| Cloud Mining
| Hardware Mining
| Merged Mining
| MultiPool
| Trading on CEX.IO
|-
| BTC
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{No}}
| {{Yes}}
|-
| NMC
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{No}}
| {{Yes}}
|-
| DVC
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{No}}
| coming soon
|-
| IXC
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{No}}
| coming soon
|-
| LTC
| coming soon
| {{Yes}}
| {{No}}
| {{Yes}}
| {{Yes}}
|-
| DOGE
| coming soon
| {{Yes}}
| {{No}}
| {{Yes}}
| coming soon
|-
| AUR
| coming soon
| {{Yes}}
| {{No}}
| {{Yes}}
| coming soon
|-
| FTC
| coming soon
| {{Yes}}
| {{No}}
| {{Yes}}
| coming soon
|-
| RDD
| coming soon
| {{Yes}}
| {{No}}
| {{Yes}}
| coming soon
|-
| MEC
| coming soon
| {{Yes}}
| {{No}}
| {{Yes}}
| coming soon
|-
| ANC
| coming soon
| {{Yes}}
| {{No}}
| {{Yes}}
| coming soon
|-
| MYR
| coming soon
| {{Yes}}
| {{No}}
| {{Yes}}
| coming soon
|-
| POT
| coming soon
| {{Yes}}
| {{No}}
| {{Yes}}
| coming soon
|-
| USDE
| coming soon
| {{Yes}}
| {{No}}
| {{Yes}}
| coming soon

|}

==Connection with CEX.IO==
GHash.IO and [[CEX.IO]] have the same account credentials, and therefore the pool is considered to be the mining side of CEX.IO. The connection between these two platforms allows users to benefit from simultaneous trading and mining. Mining power (GHS) purchased at CEX.IO mine new Bitcoins at GHash.IO until GHS are sold by the owner.

==Hashrate==
Although the hash rate of GHash.IO differs, on average the company has about 7 PH/s of power.

==PPLNS==
GHash.IO uses PPLNS (“Pay per last N shares”), a reward scheme, according to which payment is given to shares in a window, starting with the last share submitted and going backwards up to some number N of shares. Shares older than the window are not paid.
Shares are hashes, smaller than the target for difficulty of 1 (Usually, pools use such difficulty as the target for share, but technically, any difficulty could be used). Every hash created has a 1 in 232 possibility of being a valid share. In order to get Bitcoins in a more distributed and predictable way, miners use pools. If this is the case, miners are awarded Bitcoins, according to their shares.

==Compensated Downtime==
The pool’s policy provides compensation for CEX.IO mining hardware. Individual miners are not compensated.

==Merged Mining==
GHash.IO embodies merged mining of such alternative cryptocurrencies, as NMC (Namecoin), IXC (IXCoin) and DVC (DevCoin). At the moment, users can exchange mined NMC for Bitcoins, Litecoins or reinvest them in more GHS. IXC and DVC stand only for withdrawal to other exchanges or respective wallets.

==Multi Pool Pro==
On April 8th, 2014 GHash.IO presented a new scrypt mining feature, GHash.IO Multi Pool Pro, which enables users to mine the most financially rewarding coins at any given moment and benefit from additional settings, such as the conversion and the switch settings. According to GHash.IO, “Pro” stands for ‘progressive’, ‘professional’ and ‘profitable’. The new features allow users to mine new crypto-currencies, as well as to convert them into Bitcoins or Litecoins, as well as to adjust the miner to withdraw from the current job when switching coins. The Multi Pool Pro functions on the basis of the proportional reward system — when a block is mined, the reward is proportionally divided among all workers according to the size of their share.

==Market share==
In the beginning of January 2014 GHash.IO was very close to reaching 51% of all hashing power creating a serious threat to the Bitcoin network. However, all necessary precautions have been taken to change the course of events in order to maintain stability of the Bitcoin community. In order to eliminate the threat GHash.IO temporarily stopped accepting new independent mining facilities to the Ghash.IO pool.

[[Category:Pool Operators]]
[[ru:MtGox]]

CEX.IO

2014-06-12T12:03:18Z

TimS: Undo revision 48126 by Bronsonmilgard (talk) (replaced with links to ghash.in, which I assume is an impostor)

{{outdated}}{{infobox company|name=CEX.IO|image=[[File:CEX_Logo.png|225px]]
|trading_name=CEX.IO
|industry=[[Exchange|Bitcoin exchange]]
|foundation=July, 2013
|pairs=BTC/LTC BTC/NMC
|website=https://cex.io
}}

== CEX.IO ==

[https://cex.io/ CEX.IO] a Bitcoin commodity exchange and a platform for simultaneous GHS trading and Bitcoin mining.

==History ==

CEX.IO project development started in early 2013 and proceeded with launching the CEX.IO domain, acquiring assets of [[GHash.IO]] and, finally, registering a legal company CEX.IO LTD in November 2013. By this time, according to Blockchain.info, GHash.IO has become the biggest mining pool, reaching over 42% of the overall Bitcoin mining power, which embodied the 51% attack threat. However, CEX.IO made an official statement, assuring the Bitcoin community that it would “take all necessary precautions to prevent reaching 51% of all hashing power, in order to maintain stability of the Bitcoin network.”
In January 2014, CEX.IO user base exceeded 160,000 users.

==GHS Trading==

CEX.IO platform allows users to trade GHS.
GHS (gigahash per second) = 1 000 000 000 hashes per second. The speed of mining is measured in hashes per second — the smallest amount of work done by a miner.
While mining is more or less passive way of gaining bitcoins, trading GHS allows you to be involved in the world trading processes and enjoy the fruits of your own activity on the Bitcoin commodity exchange.
GHS price depends on the correlation between market supply and demand. After purchasing GHS at CEX.IO, users automatically start mining blocks of Bitcoins.
CEX.IO is the only Bitcoin commodity exchange where trading and mining can be done simultaneously: even when you decide to sell your GHS, they will still be mining BTC until the moment they are sold. This means your GHS will be making profit for you till the last minute you own them.

==Cloud Mining==

Due to the shared credentials between CEX.IO and [[GHash.IO]] mining pool, users can trade GHS and mine Bitcoins simultaneously.
Cloud Mining is a concept of forming groups (pools), where their joint efforts are rewarded with greater income, compared to individual mining with personal hardware. In case of cloud mining, all Bitcoin mining is done in the cloud, and once a block is mined, users receive payouts according to their shares via PPLNS.
Apart from mining Bitcoins, users can simultaneously mine alternative cryptocurrencies, such as NMC, DVC and IXC.

With Bitcoin cloud mining users can forget about the most frequent mining problems, such as:
* Massive electricity consumption,
* Constant connectivity issues,
* The need to provide cooling and space
* Annoying noise
* Other hardware maintaining issues

==Trading Pairs==

At CEX.IO, users are able to trade:
*GHS/BTC
*LTC/BTC
*NMC/BTC
*GHS/NMC
*IXC/BTC

==Referral Program==

CEX.IO has a special [https://cex.io/ref Referral Program], according to which users can
bring new people to the platform and receive 3% of the referred ones’ GHS balance to their bonus account.

==Two-Factor Authentication ==

Users can secure their accounts with passwords, but CEX.IO strongly recommends using Two-Factor Authentication (2FA).

Users are free to choose from two 2FA applications — [http://en.wikipedia.org/wiki/Google_Authenticator Google Authenticator] or [http://authy.com/ Authy]. Alternatively, users can use simple cell phones and get a text or an audio message containing respective authorisation code.

==External links==

*[http://cex.io CEX.IO website]
*[http://ghash.io Ghash.IO website]
*[https://www.facebook.com/pages/CEX.IO CEX.IO Facebook]
*[https://twitter.com/cex_io CEX.IO Twitter]

[[Category:Exchanges]]
[[Category:Mining]]

Proof of work

2014-06-10T22:20:54Z

TimS: remove unresolved ref

A '''proof of work''' is a piece of data which was difficult (costly, time-consuming) to produce so as to satisfy certain requirements. It must be trivial to check whether data satisfies said requirements. Producing a proof of work can be a random process with low probability, so that a lot of trial and error is required ''on average'' before a valid proof of work is generated. Bitcoin uses the [[Hashcash]] proof of work.

One application of this idea is using [http://en.wikipedia.org/wiki/Hashcash hashcash] as a method to preventing email spam, requiring a proof of work on the email's contents (including the To address), on every email. Legitimate emails will be able to do the work to generate the proof easily (not much work is required for a single email), but mass spam emailers will have difficulty generating the required proofs (which would require huge computational resources).

Hashcash proofs of work are used in Bitcoin for block generation. Proofs of work that are tied to the data of each block are required for the blocks to be accepted. The [[difficulty]] of this work is adjusted so as to limit the rate at which new blocks can be generated by the network to one every 10 minutes. Due to the very low probability of successful generation, this makes it unpredictable which worker computer in the network will be able to generate the next block.

For a block to be valid it must hash to a value less than the current [[target]]; this means that each block indicates that work has been done generating it. Each block contains the hash of the preceding block, thus each block has a [[block chain|chain]] of blocks that together contain a large amount of work. Changing a block (which can only be done by making a new block containing the same predecessor) requires regenerating all successors and redoing the work they contain. This protects the block chain from tampering.

The most widely used proof-of-work schemes are SHA-256, which was introduced by [[Bitcoin]], and scrypt, which is used by currencies such as Litecoin.<ref>[http://cryptocointalk.com/forum/178-scrypt-cryptocoins/ SCRYPT CRYPTOCOINS - CryptoCoinTalk]</ref> Some other hashing algorithms that are used for proof-of-work include Blake-256, CryptoNight,<ref>[https://cryptonote.org/inside.php#equal-proof-of-work Equal Proof-of-Work], Cryptonote.org</ref> HEFTY1, Quark, SHA-3, scrypt-jane, scrypt-n, X11, and X13.

Some cryptocurrencies, such as Peercoin, use a combined [[proof-of-work]]/[[proof-of-stake]] scheme,<ref name="PPCoin paper">{{cite web|title=PPCoin: Peer-to-Peer Crypto-Currency with Proof-of-Stake|url=http://barkingshibes.com/wp-content/uploads/2014/02/ppcoin-paper.pdf|work=http://barkingshibes.com/wp-content/uploads/2014/02/ppcoin-paper.pdf, 19-08-2012|publisher=Sunny King, Scott Nadal|accessdate=12-05-2013| date=January 2014}}</ref> while others such as Nxt<ref>{{cite web|title=NXTcrypto|url=http://www.nxtcrypto.org/|publisher=NXTcrypto|accessdate=5 March 2014}}</ref> exclusively use proof-of-stake.

== Example ==

Let's say the base string that we are going to do work on is "Hello, world!". Our target is to find a variation of it that SHA-256 hashes to a value beginning with '000'. We vary the string by adding an integer value to the end called a [[nonce]] and incrementing it each time. Finding a match for "Hello, world!" takes us 4251 tries (but happens to have zeroes in the first four digits):

"Hello, world!0" => 1312af178c253f84028d480a6adc1e25e81caa44c749ec81976192e2ec934c64
"Hello, world!1" => e9afc424b79e4f6ab42d99c81156d3a17228d6e1eef4139be78e948a9332a7d8
"Hello, world!2" => ae37343a357a8297591625e7134cbea22f5928be8ca2a32aa475cf05fd4266b7
...
"Hello, world!4248" => 6e110d98b388e77e9c6f042ac6b497cec46660deef75a55ebc7cfdf65cc0b965
"Hello, world!4249" => c004190b822f1669cac8dc37e761cb73652e7832fb814565702245cf26ebb9e6
"Hello, world!4250" => 0000c3af42fc31103f1fdc0151fa747ff87349a4714df7cc52ea464e12dcd4e9

4251 hashes on a modern computer is not very much work (most computers can achieve at least 4 million hashes per second). Bitcoin automatically varies the [[difficulty]] (and thus the amount of work required to generate a block) to keep a roughly constant rate of block generation. The probability of a single hash succeeding can be found [http://blockexplorer.com/q/probability here].

In Bitcoin things are a bit more complex, especially since the header contains the [http://en.wikipedia.org/wiki/Merkle_tree Merkle tree] which depends on the included [[transactions]]. This includes the generation transaction, a transaction "out of nowhere" to our own address, which in addition to providing the miner with incentive to do the work, also ensures that every miner hashes a unique data set.

== List of algorithms ==

=== Traditional proof of work ===
# hashcash with double iterated SHA256
# hashcash with [[scrypt]] internal hash
# [[Momentum]] birthday collision
# Cuckoo cycle proof of work https://github.com/tromp/cuckoo
# Various other proof of works functions (e.g. [[Ethereum]] had a few candidates)

=== Proof of X ===
# [[Proof of Stake]]
# [[Proof of Burn]]

[[Category:Vocabulary]]
[[Category:Proof-of-x]]

[[fr:Preuve de travail]]

==References==
<references/>

User talk:Bitmix4you

2014-06-10T22:18:08Z

TimS: /* Copyright notice */ new section

== Copyright notice ==

(on [[Bitmix4you]]) Doesn't work that way. Read the notice next to the save button: "Please note that all contributions to Bitcoin are considered to be released under the Creative Commons Attribution 3.0 (see [[Bitcoin:Copyrights]] for details). If you do not want your writing to be edited mercilessly and redistributed at will, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource. '''Do not submit copyrighted work without permission!'''" I've edited out the copyright notice. If you actually wanted to invoke that copyright over the text, remove it from the wiki. --[[User:TimS|TimS]] ([[User talk:TimS|talk]]) 22:18, 10 June 2014 (UTC)

User talk:TheDuche

2014-06-10T22:11:40Z

TimS: /* Referral link */ new section

== Referral link ==

Trying to make the Coinbase link have you as a referrer is not allowed. See [[Bitcoin:About#Links]]. --[[User:TimS|TimS]] ([[User talk:TimS|talk]]) 22:11, 10 June 2014 (UTC)

Buying bitcoins

2014-06-10T22:08:29Z

TimS: Undo revision 48058 by TheDuche (talk)

There are various methods available for '''buying bitcoins'''. If you are located in the USA, [http://coinbase.com Coinbase] is your best option. See [[Buying Bitcoins (the noob version)|here for a Newb-friendly version]] of this page.

'''NOTE:''' For taking advantage of Bitcoin volatility you are able to trade CFDs through [http://www.avatrade.com/lp/trade-bitcoin?tag=39206&tag2 AvaTrade] or [http://www.plus500.com/Instruments/BTCUSD?id=73407&pl=2 Plus500]. When trading online your capital may be at risk. Trading CFDs is suitable for more experienced traders.

{{Counterparty-warning}}

==Market Exchanges==

Market exchanges are those in which buy orders are matched with sell orders, so the price offered depends on the market. If a service quotes a price then it is not operating a [http://bitcoincharts.com/markets market] but instead is a broker that buys and/or sells coins. Those exchanges are found in the list of [[Buying bitcoins#Fixed_Rate_Exchanges_.26_Others|fixed-rate exchanges]].

Exchanges are listed in alphabetical order.

{| class="wikitable"
|-
| Exchange || Adding Funds || Withdrawing Funds || Notes
|-
| [[File:Minilogo.png|35px|link=https://www.1bse.com]] [https://1bse.com 1Bse] ([[1Bse|info]])|| BTC LTC DOGE HKD (International Bank Wire) HKD (Local Bank Transfer) USD (International Bank Wire) USD (Payeer.com including Yandex.money, Perfect Money, QIWI) USD (Local Bank Transfer) EUR (International Bank Wire) EUR (Local Bank Transfer) EUR (Payeer.com including Yandex.money, Perfect Money, QIWI) SGD (International Bank Wire) SGD (Local Bank Transfer) CNY (Local Bank Transfer) CNY (International Bank Wire) || BTC LTC DOGE HKD (International Bank Wire) HKD (Local Bank Transfer) USD (International Bank Wire) USD (Payeer.com including Yandex.money, Perfect Money, QIWI) USD (Local Bank Transfer) EUR (International Bank Wire) EUR (Local Bank Transfer) EUR (Payeer.com including Yandex.money, Perfect Money, QIWI) SGD (International Bank Wire) SGD (Local Bank Transfer) CNY (Local Bank Transfer) CNY (International Bank Wire) ||<ul><li>Two-Factor Authentication</li><li>Protection from session steal</li><li>24/7 trading monitoring</li><li>No Fees for transfer funds between 1Bse users</li><li>Fees for transaction - 0.15%</li><li>Based in Hong Kong</li><li>Language: English</li></ul>
|-
| [[File:ANXIcon.png|20px|link=https://anxbtc.com]] [https://anxbtc.com ANXBTC]([https://en.bitcoin.it/wiki/Asia_Nexgen_Bitcoin_Exchange info)] || BTC HKD (International Bank Wire) HKD (Local Bank Transfer) HKD (In Store Cash Deposit) USD (International Bank Wire) USD (EgoPay) AUD (Local Bank Transfer) AUD (International Bank Wire) CAD (International Bank Wire) CHF (International Bank Wire) EUR (SEPA) EUR (International Bank Wire) EUR (EgoPay) GBP (International Bank Wire) JPY (International Bank Wire) NZD (International Bank Wire) SGD (International Bank Wire) || BTC HKD (International Bank Wire) HKD (Local Bank Transfer) USD (International Bank Wire) USD (EgoPay) AUD (Local Bank Transfer) AUD (International Bank Wire) CAD (International Bank Wire) CHF (International Bank Wire) EUR (SEPA) EUR (International Bank Wire) EUR (EgoPay) GBP (International Bank Wire) JPY (International Bank Wire) NZD (International Bank Wire) SGD (International Bank Wire) || <ul> <li>Trading Fees as low as 0.05%</li><li>Zero Bank Transfer Deposit Fees</li><li> Daily processing of withdrawals and deposits Mon-Fri<li>All 10 fiat currency orders are maintained within a single order book</li><li> Registered and based in Hong Kong</li><li> An approved Money Services Operator (MSO) with a license issued by the Hong Kong Customs and Excise Department</li><li>Gox compatible trading API Available</li><li> Multilingual support (English, Traditional Chinese, Simplified Chinese)<li>Two-Factor Authentication</li><li>Accepts cash deposits at the world's first Bitcoin retail store</li><li>Native wallet apps for both [https://play.google.com/store/apps/details?id=com.anxbtc.android Android] and [https://itunes.apple.com/us/app/anx-vault-your-bitcoin-wallet/id855057847?ls=1&mt=8 iOS]</li></ul>
|-
| [[File:ANXIcon.png|20px|link=https://anxpro.com]] [https://anxpro.com ANXPRO]([https://en.bitcoin.it/wiki/Asia_Nexgen_Bitcoin_Exchange info)] || BTC LTC PPC NMC DOGE HKD (International Bank Wire) HKD (Local Bank Transfer) HKD (In Store Cash Deposit) USD (International Bank Wire) USD (EgoPay) AUD (Local Bank Transfer) AUD (International Bank Wire) CAD (International Bank Wire) CHF (International Bank Wire) EUR (SEPA) EUR (International Bank Wire) EUR (EgoPay) GBP (International Bank Wire) JPY (International Bank Wire) NZD (International Bank Wire) SGD (International Bank Wire) || BTC LTC PPC NMC DOGE HKD (International Bank Wire) HKD (Local Bank Transfer) USD (International Bank Wire) USD (EgoPay) AUD (Local Bank Transfer) AUD (International Bank Wire) CAD (International Bank Wire) CHF (International Bank Wire) EUR (SEPA) EUR (International Bank Wire) EUR (EgoPay) GBP (International Bank Wire) JPY (International Bank Wire) NZD (International Bank Wire) SGD (International Bank Wire) || <ul> <li>Trading Fees as low as 0.05%</li><li>Zero Bank Transfer Deposit Fees</li><li>The only crypto-currency exchange in the world that facilitates Altcoin trading in ALL major currencies</li><li> Daily processing of withdrawals and deposits Mon-Fri<li>All 10 fiat currency orders are maintained within a single order book</li><li> Registered and based in Hong Kong</li><li> An approved Money Services Operator (MSO) with a license issued by the Hong Kong Customs and Excise Department</li><li>Gox compatible trading API Available, inc. support for Altcoins</li><li> Multilingual support (English, Traditional Chinese, Simplified Chinese)<li>Two-Factor Authentication</li><li>Accepts cash deposits at the world's first Bitcoin retail store</li><li>Advanced trading interface including support for keyboard hotkeys (i.e. 'B' for Buy, 'L' for Limit, 'Enter' to execute, etc)</li><li>Native wallet apps for both [https://play.google.com/store/apps/details?id=com.anxbtc.android Android] and [https://itunes.apple.com/us/app/anx-vault-your-bitcoin-wallet/id855057847?ls=1&mt=8 iOS]</li></ul>
|-
| [[File:BitQuickco.png|20px|link=https://www.bitquick.co]] [https://www.bitquick.co BitQuick.co]([https://en.bitcoin.it/wiki/BitQuick.co info)] || BTC Cash Deposit SEPA Transfer (International) || BTC|| Connects buyers to sellers around the globe via bank cash deposit or SEPA transfer. No registration required. Instant deposit to any bitcoin address after cash deposit or SEPA transfer receipt received.
|-
| [https://www.bitsource.org BitSource.org]([https://en.bitcoin.it/wiki/BitSource info)] || BTC LTC PPC Visa Mastercard Cash Deposit SEPA Transfer (International) OKPay Payeer EgoPay SWIFT Transfers/Bank wire PerfectMoney MoneyPak || BTC LTC PPC Bank Wire|| BitSource.org is a crypto-currency exchange platform focused on simplifying the purchase and sale of Bitcoin, Litecoin, and other crypto-currencies. The company holds up to 98% of customer funds in cold wallets and offline in bank vaults to prevent theft or loss.
|-
| [[Bitcoin Central]] || BTC EUR (SEPA bank transfer) International wire transfer || BTC EUR (SEPA bank transfer) International wire transfer ||
|-
| [[bitNZ]] || BTC NZD (Cash depost as Westbank) || BTC NZD (Domestic bank transfer) ||
|-
| [https://www.bitfinex.com/ Bitfinex] || BTC USD (Intl wire)|| BTC USD (Intl wire) ||
|-
| [[Bitstamp]] || BTC EUR (SEPA transfer) USD (Intl wire) USD ([[Ripple]]) CHF || BTC BTC (Redeemable code) EUR (SEPA transfer) USD (Intl wire) USD (Ripple) CHF || EUR and CHF deposits converted to/from USD for trading
|-
| [https://bitcoin-24.com Bitcoin-24] || BTC EUR (SEPA transfer) EUR (Credit Card) EUR (SOFORT Überweisung || BTC EUR (SEPA transfer) || SOFORT Überweisung and Credit Card deposits are instant
|-
| [https://BTCMarkets.net BTCMarkets.net] || BTC LTC AUD (Local Bank Transfer) AUD (Westpac Branch Cash Deposit) || BTC LTC AUD (Local Bank Transfer) || <ul><li>Australia's only locally based full service Bitcoin and Litecoin exchange.</li><li>Branch cash deposits (1-3 hours to clear)</li><li>Fast domestic bank transfers (1-2 business days to clear)</li><li>No deposit or withdrawal fees</li><li>No international bank or currency conversion fees</li><li>Australian owned and operated company with local support</li><li>Trading fees from as low as 0.6%.</li><li>[https://BTCMarkets.net BTCMarkets.net]</li></ul>
|-
| [http://BTCTurk.com BTCTurk.com] || BTC TL (Bank transfer) || BTC TL (Bank transfer) || <ul><li> The first Bitcoin exchange to allow trades in Turkish Lira.</li><li> Available in Turkish language. </li></ul>
|-
| [[BTC-E]] || BTC BTC (BTC-e redeemable code) USD (Cash deposit at Post of Russia) USD (Cash deposit at banks including Privatbank, Savings Bank of Russia (Sberbank), RU/UA Terminals, & more) USD (Interkassa) USD (WebMoney - WMZ) USD (Yandex) USD (LiqPay) USD (Perfect Money) USD (QIWI) USD (OKPay) USD (RBK Money) USD (Ditial currencies including НСМЭП (NSMEP), Единый Кошелек (Unified Purse), TeleMoney, & more) USD (International bank wire) EUR (SEPA bank transfer) RUB (QIWI) RUB (LiqPay) RUB (WebMoney-WMR) RUB (BTC-e Redeemable code) RUB (Bank transfer) || BTC BTC (BTC-e redeemble code) USD (Webmoney - WMZ) USD (Perfect Money) USD (LiqPay) USD (QIWI) USD (PayPal) USD (OKPay) USD (Payza/AlertPay) USD (Privat, Privat UAH) USD (Cash deposit into Savings Bank/Sberbank, Telebank, Alfa Bank) USD (BTC-e Redeemable Code) USD (International Wire Transfer) EUR (SEPA bank transfer) RUB (Cash delivery, possible in Moscow) RUB (QIWI) RUB (LiqPay) RUB (WebMoney WMR) RUB (Яндекс.Деньги Yandex) RUB (RBK Money) Cash deposit (into account at Сбербанка России!/Savings Bank/Sberbank, Телебанк (Telebank), and АльфаБанк (Alfa Bank) RUB (Transfer to credit card VISA & MasterCard) RUB (BTC-e Redeemable code) RUB (Bank transfer) || Language: English, Russian. Interkassa can be funded from Webmoney and many other methods. BitInstant Can be funding option includes QIWI, Cyberplat.
|-
| [https://CampBX.com/ CampBX] (CBX) || BTC USD ([[Dwolla]]) USD (P2P bank transfer at Chase, B of A, Wells Fargo and ING. Credited after three business days). USD (Personal Check) USD (USPS Postal money order, Canada Post money order) || BTC USD ([[Dwolla]]) USD (ACH Direct Deposit) USD (USPS Postal Money Order) USD (Domestic bank wire) USD (International bank wire) || <ul> <li> Security certification from McAfee</li><li> Advanced trading options with AON/FOK/Market</li> <li>STOPLOSS and Short-Selling in Pipeline</li><li> Trading API available</li><li> Wallet API available </li><li> CBX Instant Bitcoin Transfers Feature </li><li> Stoploss / Custom Order Expiry Date/Time </li><li> SMS (Text Message) Notifications </li> <li> Two-Factor Authentication </li> <li> Based in USA - Atlanta </li> </ul>
|-
| [[CoinMKT]] || | BTC | LTC | PPC | TRC | NVC | NMC | FTC USD ([[Dwolla]]) USD (P2P bank transfer at any US bank, credited after three business days). USD (Personal Check) USD (USPS Postal money order, Canada Post money order) || | BTC | LTC | PPC | TRC | NVC | NMC | FTC USD ([[Dwolla]]) USD (USPS Postal Money Order) USD (Domestic bank wire) USD (International bank wire) || <ul> <li>Trade any currency pair</li><li>Fast, web-based ID verification</li><li>Focused on user experience</li><li>Play money trading</li> <li> Based in Santa Monica, CA </li> </ul>
|-
| [[File:e-cointrade.com logo.png|link=https://www.e-cointrade.com/cointrade/content.jsp?language=English&ref=en.bitcoin.it&id=Home]] [https://www.e-cointrade.com/cointrade/content.jsp?language=English&ref=en.bitcoin.it&id=Home e-CoinTrade.com] ([[e-cointrade.com|info]]) || | Deposits: BTC | LTC | FTC | IXC | NVC | MNC | TRC | PPC USD ([[Perfect Money]]) EUR ([[Perfect Money]]) || | Withdrawals: BTC | LTC | FTC | IXC | NVC | MNC | TRC | PPC USD ([[Perfect Money]]) EUR ([[Perfect Money]]) || <ul><li> Focused in '''symplicity''' for the average user.</li><li> Full multilanguage, available in: English, Deutche, Español, Pусский, Français. </li> <li> Automatic trading platform.</li><li> Trade in any combination of the currency pairs.</li><li> Live ''chatbox'' for users.</li></ul>
|-
| [[FYB-SG]] || BTC SGD(Internet Bank Transfer) SGD (Annonymous Cash Deposit at any UOB Cash Deposit Machine in Singapore). || BTC SGD(Internet Bank Transfer) || Based in Singapore
|-
| [[FYB-SE]] || BTC SEK(Internet Bank Transfer) || BTC SEK(Internet Bank Transfer) || Based in Sweden
|-
| [[File:Hit_20.png|20px|link=https://www.hitbtc.com]][[HITBTC]] || | BTC LTC EUR (Wire Transfer) USD (Wire Transfer) || | BTC LTC EUR (Wire Transfer) USD (Wire Transfer) || <ul> <li>Cutting-edge technology places and matches order in milliseconds</li><li>Two-factor Authentication</li><li>WebSocket subscription for prices and trades</li><li>Asynchronous WebSocket-based trading interface</li><li>FOK and IOC orders</li><li>API</li>
|-
| [https://www.itbit.com itBit] || BTC SGD(Bank Wire/GIRO) USD (Bank Wire) EUR(Bank Wire)|| BTC SGD(Bank Wire/GIRO) USD (Bank Wire) EUR(Bank Wire) || Based in Singapore
|-
| [http://ice3x.co.za iceCUBED] || BTC LTC ZAR (Local and International Bank Transfer) || BTC LTC ZAR (Local and International Bank Transfer) || <ul><li>South Africa's only locally based full-service Bitcoin and Litecoin exchange</li><li>Fast domestic bank transfers (1-2 business days to clear)</li><li>No deposit or withdrawal fees</li><li>No international bank or currency conversion fees</li><li>South African owned and operated company with local support</li><li>Trading fees from as low as 0.6%.</li><li>[http://ice3x.co.za iceCUBED]</li></ul>
|-
| [[Justcoin]] || | BTC | XRP | LTC NOK (Domestic transfer) EUR (SEPA/International wire transfer) USD (SEPA/International wire transfer) || | BTC | XRP | LTC NOK (Domestic transfer) EUR (SEPA/International wire transfer) USD (SEPA/International wire transfer) || <ul> <li>Based in Oslo, Norway</li><li>Two-factor Authentication</li><li>API</li>
|-
| [[Kapiton.se]] || BTC SEK (Bankgiro Bank Transfer) || BTC SEK (Bankgiro Bank Transfer) ||
|-
| [[Kraken]] || | BTC | XRP | LTC | XVN EUR (SEPA transfer) EUR (International bank wire) USD (Domestic bank wire) USD (International bank wire) || | BTC | XRP | LTC | XVN EUR (SEPA transfer) EUR (International bank wire) USD (Domestic bank wire) USD (International bank wire) USD (ACH) || <ul> <li>Legally compliant</li><li>Advanced Stop Orders</li><li>Margin Trading</li><li>Based in San Francisco, CA</li><li>Two-factor Authentication</li><li>API</li>
|-
| [[File:MMB.png|20px|link=https://www.mengmengbi.cn]] [https://www.mengmengbi.cn Mengmengbi (萌萌币)]([https://en.bitcoin.it/wiki/Mengmengbi info)] || BTC LTC PPC NMC DOGE CNY(Local Bank Transfer) || BTC LTC PPC NMC DOGE CNY(Local Bank Transfer) || <ul> <li>Powered by [https://www.anxpro.com ANX] </li><li>Zero Trading Fees</li><li> Instant processing of CNY deposits</li><li> Near realtime processing of CNY withdraways (Mon-Fri)</li><li>Gox compatible Trading API with BTC, DOGE, LTC, PPC, NMC support</li><li>Zero bank transfer fees</li><li>Shared liquidity with ANX, one of the top 10 Bitcoin exchanges in the world</li><li> Multilingual support (English, Traditional Chinese, Simplified Chinese)<li>Two-Factor Authentication</li></ul>
|-
| [[Rock Currency Exchange]] || BTC EUR (SEPA transfer) SLL (Second Life) USD (Dwolla) || BTC EUR (SEPA transfer) SLL (Second Life) USD (Dwolla) ||
|-
| [[VirtEx]] || BTC CAD (cash deposit at Bank of Montreal or ScotiaBank) CAD (Online bill payment) CAD (Wire transfer) || BTC CAD (direct deposit) CAD (Canada Xpress Post Bank Draft send by mail) CAD Payza (formerly AlertPay) ||
|-
| [https://www.virwox.com/ VirWox] || BTC SLL (Second Life) ACD (Avination) OMC (OpenSim) USD,EUR,GBP,CHF ([[PayPal]]) USD,EUR,GBP (Credit & Debit cards via [[Skrill]]/Moneybookers) USD,EUR,GBP ([http://www.neteller.com NETELLER]) EUR (DIRECTebanking / Sofortuberweisung) USD,EUR,GBP,CHF ([http://www.paysafecard.com PaySafe Card]) EUR (SEPA bank transfer) USD ([[UKash]] vouchers) || BTC SLL (Second Life) ACD (Avination) OMC (OpenSim) USD,EUR,GBP,CHF ([[PayPal]]) USD,EUR,GBP ([[Skrill]]/Moneybookers) USD,EUR,GBP ([http://www.neteller.com NETELLER]) EUR (SEPA bank transfer) || Trading through Second Life Linden Dollars. Variable limits on PayPal and Credit Card deposits.
|-
| [https://www.bitcointoyou.com BitcoinToYou] || BTC BRL USD EUR || BTC BRL USD EUR || Language: Portuguese (português), customer can buy in cash ou bank deposit at HSBC, SANTANDER, ITAÚ, CAIXA, BRADESCO and BANCO DO BRASIL.
|-
| [[MORREX]] || BTC CAD CAD (Online bill payment) CAD (Wire transfer) || BTC CAD CAD (Canada Xpress Post Bank Draft send by mail) CAD ||
|}

==Fixed Rate Exchanges & Others==
For smaller amounts, the options are limited due to bank transfer fees, conversion fees and transaction size restrictions. Options include:

{| class="wikitable"
|-
| Service || Payment Method || Notes
|-
| [https://www.alfacashier.com ALFAcashier] || BTC Bitcoin LTC Litecoin USD PerfectMoney USD LiqPay USD OKPay USD EgoPay USD BTC-E coupon/refill USD (International Bank Wire) EUR (International Bank Wire) RUB (Russian Bank Wire) || Instant exchanger. Language: English, German, Russian, Chinese <ul><li>Cumulative discount system</li><li>Affiliate program</li><li>Fees only 1-3%</li></li>
|-
| [https://www.bestexchangeonline.com Bestexchangeonline.com] || USD PerfectMoney EUR PerfectMoney Cashu Egopay Okpay Bitcoin Webmoney PayPal USD LiqPay RUB || Buy Sell Exchange Bitcoins with the best price. <ul><li>Instant Exchange</li><li>24/7/365 support</li>
|-
| [[File:BitSimpleIcon.png|30px|link=https://BitSimple.com]] [https://BitSimple.com BitSimple.] ([[BitSimple.|info]]) || USD (bank wire) || Don't get goxxed again! We never hold user's bitcoins. Purchased bitcoins will be directly transferred to your personal bitcoin wallet. Stop accepting long delays waiting for funding. We will lock in a rate once you confirm the wire has been sent, and will deliver your purchased coins the same day, usually within an hour.
|-
| [[File:BittyBot-head.png|20px|link=http://BittyBot.co.uk]] [http://BittyBot.co.uk BittyBot] ([[BittyBot|info]]) || GBP (varies person to person) || BittyBot monitors and compares the UK Bitcoin market to help you find the best prices and most reputable traders.
|-
| [https://quickbitcoin.co.uk Quickbitcoin.co.uk] ([[Quickbitcoin|info]]) || GBP (bank transfer) || Buy bitcoins in the UK in under 1 hour from trusted uk seller. Payments by UK bank transfer. No sign up required. [http://www.trustpilot.co.uk/review/quickbitcoin.co.uk See reviews here].
|-
| [https://24change.com 24Change.com] ([[24change.com|info]]) ||
* USD, UAH, RUB, Visa, MasterCard
* C-Coin, eCoin, EgoPay, Payza, Payoneer, EPESE, MoneyGram, OKPAY, WireTransfer, QIWI, Yandex Money, BTC-E code, PayPal, PerfectMoney, Paymer, ePayments, LiqPay, Redpass, WESTERN UNION, C-Gold, Pecunix
* International Banks, Sberbank, Alfa-Bank, Privat24, Svyaznoy Bank, VTB24
||
* Automatic bitcoin and e-currencies buy/sell service
* 24/7/365 fast and reliable e-currencies exchange
* Unlimited reserves
* 15% Affiliate program
|-
|[[File:favicon_b4c.jpg|20px|link=https://bit4coin.net]] [https://bit4coin.net bit4coin.net] ([[bit4coin|info]]) || [https://www.sofort.com SOFORT banking] SEPA transfer (EUR) International bank transfer || Buy bitcoin with gift vouchers: Order bit4coin gift vouchers online at [https://bit4coin.net bit4coin.net] and get them shipped to your door, ready to redeem into bitcoins. No registration required. Perfect for own use or as gift.
|-
| [[File:BitQuickco.png|20px|link=https://www.bitquick.co]] [https://www.bitquick.co BitQuick.co] ([https://en.bitcoin.it/wiki/BitQuick.co info)] || Cash Deposit or SEPA Transfer Only (International) || Connects buyers to sellers around the globe via bank cash deposit or SEPA transfer. No registration required. Instant deposit to any bitcoin address after cash deposit or SEPA transfer receipt received.
|-
| [https://www.cryptxchange.com Cryptxchange] || USD (Cash Deposit) USD (Wire Transfer) CAD (Cash Deposit) CAD (Wire Transfer) You may make cash deposits at any Chase Bank Internationally (ARS, GBP, EUR, AUD, BRL, CLP, COP, EGP, KYD, SAR, CNY, AED, JPY, INR || A multinational US based cryptographic currency exchange. No login or account creation required. No identity verification required. Exquisite customer service. Average transaction time under two hours depending on the time of the day. One of the most anonymous and reliable exchanges on the net. We use SSL & AES-256 military grade encryption for all communication
|-
| [https://www.getbitcoin.com.au Bitcoin (Australia)] || AUD (Bank Deposit) || Bitcoin (Australia) / [https://www.getbitcoin.com.au www.getbitcoin.com.au] offers rapid transfer at low rates.
|-
| [[File:BIPS.gif|20px|link=https://bips.me]] [https://bips.me BIPS] ([[BIPS|info]]) || CAD (Cash deposits in Canada Any Currency (Wire Transfer - Any Country) USD || <ul><li>DK-based</li><li>[https://github.com/BitcoinInternetPaymentSystem BIPS GitHub]</li><li>[https://bips.me/connect/BitcoinInternetPaymentSystemAPI.pdf REST API]</li></ul>
|-
| [http://indo-bitcoin.com Indo-Bitcoin.com] || IDR Mandiri (Cash deposit and wire transfer) IDR BNI (Cash deposit and wire transfer) IDR BCA (Cash deposit and wire transfer) IDR BRI (Cash deposit and wire transfer) || Beli Bitcoin di Indonesia. Lowest fees, max. 30 minutes per transfer, 24 hours 7 days. No verification required.
|-
| [https://Bitcash.cz/market Bitcash.cz] ([[Bitcash.cz|info]]) || CZK domestic wire, EUR with SEPA || Live Auction Rates, person-to-person contract fulfillment
|-
| [https://www.bitbrothersllc.com BitBrothers LLC] || Bank Transfer/Cash/Moneygram || If you are looking for an extremelly simple and anonymous way to purchase bitcoins, this is the best place to do it. We are so sure you will be a repeat customer that we are willing to provide discounts for first time buyers. Best Customer service in the industry.
|-
| [https://truckcoin.com TRUCK COIN] || Bank Transfer/Paypal/Wester Union/Moneygram/Cash/any method with any currency || There is another anonymous way to purchase bitcoins, this is the best safety and anonymous way.
|-
| [https://bitcointalk.org/index.php?topic=237164.0 Bitcoin-Brokers (USA)] || Cash deposit || At major banks like Bank of America, Chase, Wells Fargo, PNC, Citibank. No ID, No registration. Immediate fundings.
|-
| [https://bitcoini.com Bitcoini.com (Bulgaria, Romania)] || BGN (Bank deposit, Cash, EasyPay, Post, Econt) RON (Bank deposit) USD (Western Union, MoneyGram) || Fast and secure way to buy/sell bitcoins. Live support
|-
| [http://www.bitcoinbymobile.com BitcoinByMobile.com] || Mobile Phone (Premium SMS)|| Buy bitcoins instantly using just your mobile phone. No registration or personal financial information needed. Available in: Austria, France, Germany, Luxembourg, Netherlands, Portugal, Spain, and United Kingdom
|-
| [http://www.btc-dealer.com BTC-Dealer] || Credit Card through Liqpay || No signup required. Instant deposit to any bitcoin address
|-
| [https://moneypaktrader.com MoneypakTrader.com] ([[MoneypakTrader.com|info]]) || Moneypak (USD) <======> BTC BTC <======> Moneypak (USD) ReLoadit, etc. (USD) <====> BTC BTC <======> ReLoadit, etc. (USD) || Pays a bonus over market for your BTC Charges a fee over market for your Moneypak, etc. Only accepts codes from original purchaser Attempts to have regular customers processed within 24 hrs Available for discussion via TorChat
|-
| [https://bitbargain.co.uk BitBargain] ([[BitBargain|info]]) || GBP || Quick transactions via Bank Transfer (fast payments support only), Pingit and Ukash. Deals happen between buyer and seller.
|-
| [https://bittylicious.com Bittylicious] ([[Bittylicious|info]]) || GBP, EUR, ZAR || Near instant transactions via UK Bank Transfer (Faster Payments only). No sign up required but can buy more if registered.
|-
| [http://btc.pt BTC.pt] || EUR (Multibanco) || Anonymous transactions. Pay the amount on any Portuguese ATM(MB) or homebanking service, we'll deduce our fee and buy the coins for you at market rate and send them very fast to your wallet. Only available in Portugal.
|-
| [https://www.bitcointrader.com.au Bitcointrader] ([[Bitcointrader|info]]) || AUD (Cash deposit) || Lowest fee in Australia! Only 5%. Buy and sell bitcoins quickly and easily! Cash deposit at any Westpac Bank and National Australia Bank branch in Australia.
|-
| [https://blockchain.info/wallet/deposit-methods Blockchain] ([[BlockChain.info|info]]) || USD, GBP, EUR, BRL, AUD, CAD, JPY, EUR, CHF, PLN, CZK, RON, RUB, SEK, NOK, DKK || Purchased through [[BitInstant]] (U.S., Brazil, and Russia), Barclay's Pingit or Bank Transfer (GBP), Instant Bank Transfer (EUR) or SMS or premium phone call from a mobile.
|-
| [[BitInstant]] || USD (Cash deposit at banks, 7-11, Walmart, CVS, Moneygram locations) USD (Dwolla) BRL (Cash deposit at Banco Rendimento or through Boleto) RUB (Cash deposit through Qiwi or Cyberplat) || Deposit cash at 700,000 locations around the world and have your Bitcoins within 30 minutes. Absolute fastest and easiest way to buy Bitcoins.
|-
| [[Coinapult]] || Use [[BitInstant]] to use cash to purchase bitcoins sent to e-mail or SMS. Choose "Bitcoin to e-mail" service and enter either e-mail or SMS. ||
|-
| [https://www.ripio.com/ Ripio] || Buy bitcoin in Argentina using cash payment networks like PagoFacil, RapiPago, etc. || A good option for bitcoin beginners transactions take usually less than 24 hours and places for doing the payments are all over.
|-
| [http://coinbase.com/ Coinbase] || Buy and sell bitcoin by connecting a U.S. based bank account. Users need the account and routing numbers that can be found on a check to get started. || Instant verification available for new accounts. Purchased bitcoin can be held in Coinbase's online wallet. Generally considered a good option for U.S. based bitcoin beginners.
|-
| [[Coin-Daddy]] || Buy bitcoins with PayPal and OKPAY || No verification needed. Customer just needs to pay with PayPal, leave the Wallet address and then he receives his coins, or pays via OKPAY. Available for purchase are: Bitcoins, Litecoins and PPCoins.
|-
| [http://BitcoinIsrael.co.il BitcoinIsrael.co.il] || ILS (NIS - New Israeli Shekel)
* via bank transfer
* via Bank HaDoar /Post Office Bank (instant transfer)
* via In Person
|| Buy and sell your Bitcoins within minutes in person. Get "same day" service using Bank HaDoar /Post Office Bank. Get "next day" service using Bank Transfer.
|-
| [[Bitcoin Nordic]] ||
*EUR/DKK (SEPA and wire transfer)
*USD, EUR, GBP, DKK, SEK, NOK (Cash or check in the mail)
*AED, DZD, EGP, IQD, ILS, JOD, KWD, LGP, LYD, MRO, MYR, NGN, OMR, PKR, QAR, SAR, TRL, TZS, TND, YER ([[CashU]] card)
*MXN, EYU, BOB, BRL, COP, SYP, MAD, GHC, ZAR, CNY, CAD, and more ([[UKash]] voucher)
|| For UKash, redeemed through CashU account.
|-
| [[Spend Bitcoins]] || AUD (Cash deposit) || AUD cash deposit at NAB, Commonwealth Bank, Westpac and ANZ.
|-
| [https://bitcoinmylife.com/jml/buy-bitcoins BitcoinMyLife] ([[BitcoinMyLife|info]]) || EUR (SEPA bank transfer) || Simple and Safe. Pay first transaction fee with Twitter or Facebook post.
|-
| [[bitcoin.de]] || EUR (bank wire) EUR (SEPA bank transfer) EUR ([[Skrill]]/Moneybookers) || Varies (person to person) 0.01 free Bitcoins for every new user eWallet Affiliate program Language: German, Englisch News
|-
| [https://www.BitcoinZAP.com BitcoinZAP] || SEPA bank transfer - EUR International bank transfer - EUR, USD Western Union MoneyGram Cash (in the mail) - EUR, USD, CAD, GBP, HKD, JPY, PLN, AUD, CHF, CZK, DKK, HUF, MOP, SEK, NOK || Bitcoins usually delivered in less than 24 hours after payment is received
|-
| [[BTCX.se]] || SEK || Transfer to and banks in Sweden.
|-
| [[BTC China]] || || Converted to CNY for trading.
|-
| [[bitcoincambodia.com]] || USD (Cash, possible to pay everywhere in Cambodia) || You can buy Bitcoins for USD in Cambodia.
|-
| [[BitMarket.co]] || COP (Colombian Peso) || Varies (person to person)
|-
| [[bitcoin-otc|#bitcoin-otc]] || Person-to-person, various methods || IRC trading marketplace will usually have people willing to deal for small and larger amounts using various payment methods, including [[PayPal]], [[Dwolla]], [[Linden Dollars]], etc.
|-
| [[Canadian Bitcoins]] || CAD (Cash - XpressPost or Dropoff) USD (Cash - Courier: UPS, FedEx, etc.) || For dropoff, office in Ottawa.
|-
| [http://coinrepublic.com/buy-sell-bitcoins-singapore/ Coin Republic] || SGD (Singapore Dollar)|| Payment via local bank transfer.
|-
| [https://dgtmkt.com Dgtmkt] ([[Dgtmkt|info]]) || Malaysian Ringgit (MYR) Online bank transfers (Maybank2U, CIMB, MEPS, etc) E-vouchers (Web Cash, Mobile Money) || Bitcoin merchant for Malaysians,. dealing in Malaysian Ringgit. Fully automated immediate transfers. https://dgtmkt.com
|-
| [https://www.dagensia.eu Dagensia] ([[Dagensia|info]]) ||
* SEPA Bank Transfer (EUR)
* ATM card (EUR, USD)
* Sofort Banking (EUR)
* Direct Banking (EUR)
* Payza (official Exchanger)
* EgoPay, c-gold
* BUY AND SELL BITCOINS
|| Dagensia allows you to Buy and Sell Bitcoins and to store Bitcoins securely. You can get your first Bitcoin today, or you can start accepting Bitcoins directly into EUR or USD balance and ATM card. Sell and buy your Bitcoins through Wire, or SEPA EUR transfer, Direct Banking, ATM Cards. '''Fully licensed exchanger''', supervised by Czech National Bank
|-
| [[Lilion Transfer]] || Bank Transfer: USD, AUD, CAD, JPY, EUR, CHF, GBP, PLN, CZK, RON, BGN, HRK, RUB, SEK, NOK, DKK, LTL, LVL Perfect Money Monetto OK Pay Cosmic Pay Pecunix C-Gold E-Pay Payments PayPal|| 122 accounts worldwide. Support in 30 languages
|-
| [[Nanaimo Gold]] || Western Union money transfer Moneygram money transfer Cash in the mail || Digital Currency <--> Bitcoin exchange is automated For cash in the mail send USD, EUR, CAD, or GBP. Canada mailing address.
|-
| [[Bitcoin Argentina]] || Cash: ARS, BRL, USD Bank transfer: ARS || No exchange fees!
|-
| [[Bitcoin.com.es]] || EUR (bank deposit) || Bank transfer or cash deposits at OpenBank in Spain.
|-
| [[Bahtcoin]] || Cash, Webmoney || Will cash out to Thai mobile and gaming prepaid cards as well.
|-
| [http://bitcoin.in.th Bitcoin Thailand] || THB: Cash/Bank Deposit || Same day service.
|-
| [[BitPiggy]] || AUD (Australian Dollar)|| Payment via bank transfer.
|-
| [[bitcoin.local]] || Person-to-person, various methods ||
|-
| [[bcchanger.com]] || Person-to-person via PayPal, [[Skrill]]/Moneybookers and other e-currency platforms ||
|-
| [[Bitcoil]] || ILS (bank transfer) ||
|-
| [[File:BXlogoSM.jpeg|link=http://bitXoin.com]] [http://bitXoin.com bitXoin] ([[bitXoin|info]]) || AUD (Cash deposits) || Fast transaction processing, market rates with low commissions and no fees.
Contact BUYbulk@bitXoin.com for special rates on BUY BTC transactions over $10,000 and SELLbulk@bitXoin.com for SELL BTC transactions over BTC50
https://bitXoin.com/
|-
|[[btcnow]] || USD (OKPay, Dwolla) || bitcoins transferred instantly
|-
| [http://localbitcoins.com LocalBitcoins.com] || Varies (person to person) Physical cash locally [https://localbitcoins.com/buy-bitcoins-online/cash-deposit/ Cash deposit] [https://localbitcoins.com/buy-bitcoins-online/okpay/ OKPay] [https://localbitcoins.com/buy-bitcoins-online/paypal/ PayPal] [https://localbitcoins.com/buy-bitcoins-online/dwolla/ Dwolla] [https://localbitcoins.com/buy-bitcoins-online/sepa-eu-bank-transfer/ SEPA Bank transfer] || Find your local bitcoin dealer, or purchase safely online using escrow! With dynamic pricing with equations. eWallet 
[https://localbitcoins.com/affiliate/ Affiliate program] 
[https://localbitcoins.com/api-docs/ API]
|-
| [https://www.bitbuy.nl BitBuy] || EUR (iDEAL) || Buy bitcoins instantly with iDEAL from the Netherlands. User will get price updates during the payment process.
|-
| [https://www.happycoins.com HappyCoins] || EUR (iDEAL and SEPA bank transfer) || Buy and sell Bitcoins. Use the Dutch iDEAL payment system to receive Bitcoins within minutes. Prices are based on near real-time exchange prices.
|-
| [[ECurrencyZone]] || BTC INR (Cash deposit of Indian rupee) BDT (Cash deposit of Bangladeshi taka) NPR (Cash deposit of Nepalese rupee) MYR (Cash deposit of Malaysian ringitt) SGD (Cash deposit of Singaporean dollar) SGD (Net/Bank transfer) USD (Western Union, Moneygram, Citibank global funds transfer, OKPay) USD || Bank transfer considered at all locations with prior approval.
|-
| [[BitCoinVend]] || BTC USD (PayPal) || bitcoinvend@gmail.com, market variable with commission, quote based, verified paypal account with anti scammer verification
|-
| [[Bitcoins In Berlin]] || EUR (Cash in-the mail) EUR (Cash in-person trade) EUR (SEPA bank transfer) EUR (Western Union) || Cash in-the-mail is to a Berlin P.O. box. In-person trade is in Berlin.
|-
| [https://www.lojabitcoin.pt Loja Bitcoin] || EUR (ATM/Multibanco) EUR (bank transfer) EUR (money order) EUR (cash) || Several payment methods like the Portuguese "Multibanco" (ATM), "Vale postal CTT" (money order by mail), bank transfer and cash (in some locations) - Portugal only at the moment
|-
| [[Mang Sweeney]] || PHP (Cash) PHP (Cash deposit at bank) || Languages: English, Pinoy. PHP [https://localbitcoins.com/accounts/profile/mangsweeney cash trade method] in metro Manilla, Philappines.
|-
| [[mercaBit.eu]] || EUR (Ukash) EUR (Hal-Cash) EUR (Neteller) || Buy bitcoins with ukash and more
|-
| [http://buyBTC.cz buyBTC.cz] ([[buyBTC.cz|info]]) || CZK (Domestic bank transfer) EUR (Bank transfer) || Buy bitcoins from the Czech Republic.
|-
| [http://bitonic.nl Bitonic.nl] || EUR (iDeal) || Buy bitcoins instantly from the Netherlands.
|-
| [http://www.dragons.tl Dragon's Tale] ([[Dragon's Tale|info]]) || Credit card (except in the U.S.) || Purchase bitcoins through this MMO casino with credit card, withdraw bitcoins (though a fee applies if withdrawn and no casino play.)
|-
| [https://buybitcoinbycreditcard.com buybitcoinbycreditcard.com] || JPY (Credit Card) || Buy bitcoins instantly with your credit card. No registration required. This site accept from the world.
|-
| [[OKPAY]] || BTC USD, EUR, GBP, RUB, CHF etc (Bank Wire Transfer) EUR (SofortBanking) USD, EUR (Liqpay) USD (CashU) USD, EUR, GBP, RUB, CHF etc (UWCFS) USD, RUB, UAH (Wallet1) RUB (Yandex Money) RUB (EasyPay) USD, EUR (CONTACT) USD, EUR (Migom) USD, EUR, CZK (Money Polo) USD, EUR (Intel Express) USD, EUR (Western Union via Exchange Partners) USD, EUR (Moneygram via Exchange Partners) USD, EUR (via Exchange Partners) || Support of 19 world currencies, 15 languages.
|-
| [http://bitplaats.nl Bitplaats.nl] || EUR (iDEAL) || Buy bitcoins instantly, pay with iDEAL. Buy bitcoin from the Netherlands.
|-
| [http://artabit.com artaBit.com] ([[artaBit|info]]) || IDR || Buy bitcoins in Indonesia.
|-
| [https://www.bitsofgold.co.il BitsOfGold.co.il] ([[Bits_of_Gold|info]]) || ILS || Buy bitcoins from Israel.
|-
| [http://www.rugatu.com rugatu.com] || EUR || Buy bitcoins with Neteller.
|-
| [http://wmeng.exchanger.ru WMeng.Exchanger.ru] || Buy bitcoins with:<ul><li>USD</li></li>EUR</li></li>RUB</li></li>UAH</li></li>Belorussian Roubles</li></li>Vietnamese Dongs</li></ul> Sell bitcoins for:<ul><li>USD</li></li>EUR</li></li>RUB</li></li>UAH</li></li>Belorussian Roubles || The exchange service of WebMoney Transfer system. WMT has a special units named WMX to operate BTC, which can be exchanged and/or withdrawn
|-
| [[WM-Center]] || USD (Western Union, MoneyGram) EUR RUR THB UAH || 24/7/365 support English, Spanish, Russian versions Fast reliable service since 2005
|-
| [https://www.bitgo.co.il/ bitgo.co.il]|| ILS || Buy/Sell bitcoins in Israel.
|-
| [http://www.belgacoin.com Belgacoin]|| EUR, USD, BGN, CHF, CZK, DKK, EEK, GBP, GIP, HRK, HUF, ISK, LTL, LVL, NOK, PLN, RON, SEK || The easiest way to buy Bitcoins in Europe. It is fast, secure and cheap. No registration required!
|-
| [https://bittiraha.fi/content/bittip%C3%B6rssi-osta-ja-myy-bitcoineja Bittiraha.fi]|| EUR (SEPA transfer) || Reliable Finland based exchange operated since 2012. 1-2 day deposits and 1-3 day withdrawals. No registration required!
|-

| [https://bitalo.com Bitalo] ([[Bitalo|info]]) || Varies (person to person) [https://localbitcoins.com/buy-bitcoins-online/sepa-eu-bank-transfer/ SEPA Bank transfer] || Purchase Bitcoins directly from another person. eWallet
|}

==Direct / Bulk Buying==

Liquidity providers for transactions of size ($10,000 or larger).

{| class="wikitable"
|-
| Service || Type || Payment Method || Notes
|-
| [https://www.bitbrothersllc.com BitBrothers LLC] || Direct purchases up to $10,000 || USD (Bank Deposit at a Chase bank OR cash orders including cashiers checks and money orders) || BTC || Best customer service in the industry and quickest transaction speeds.
|-
| [http://bitcointalk.org/index.php?topic=87094.0 BitPay] ([[BitPay|info]]) || Direct purchases, $10,000 USD and higher || USD (Bank wire, domestic or international) || BTC || Contact for other payment methods.
|-
| [https://truckcoin.com TRUCK COIN] || Directly and Easily || USD, EUR, SGD, VND and more (Bank Wire, Western Union, Paypal, face-face) || BTC || Contact for other method directly with sellers or buyers.
|}

==Other Financial Services==

{| class="wikitable"
|-
| Service || Type || Payment || Settled || Notes
|-
| [https://giftcarddrainer.com GiftCardDrainer.com] || Transfer gift card balance to Bitcoin address or conventional account. || BTC, USD || || Customers can redeem their Visa, MasterCard, American Express or Discover gift card for Bitcoins or payment into their personal bank or PayPal account. 5.7% + $0.57 fee.
|-
| [http://www.indx.ru/?lang=en-US INDX] || Stock market, where BTC are also traded || - || - || Trader`s account can be withdrawn with BTC or with USD via WebMoney.
|-
| [[MPEx]] || Buy / Sell / Exercise CALLs / PUTs, American style. 52 strikes offered (by .5), current month + 2. No shorting available yet.|| BTC || BTC || Transactions encoded via amt. Must use non-rounding client (0.3.24 or later)
|-
| [https://vircurex.com/ Vircurex] || Buy / Sell Options Loan / Borrow || BTC, NMC, LTC, DVC, GG, I0C, IXC, SC || BTC, NMC, LTC, DVC, GG, I0C, IXC, SC ||
|}

==Physical Bitcoins==

Physical Bitcoins are bearer tokens that have an embedded redeemable digital bitcoin value if torn open. While they are somewhat expensive if bought purely for the digital bitcoins, they are relatively easy to get, because they can be purchased with PayPal or credit card - payment methods typically not accepted for pure digital bitcoin purchases.

{| class="wikitable"
|-
| Service || Type || Payment || Notes
|-
| [https://www.casascius.com Casascius.com] || Casascius Physical Bitcoins || BTC ||
|-
| [https://btcstore.eu BTCstore.eu]|| BTC Store Paperwallets, Casascius and Recalescence Physical Bitcoins reseller || BTC, EUR (SEPA bank transfer), Finnish online banks ||
|}

==Exchange Directories==
* [http://bitcoinx.io/ BitcoinX.io] Peer-to-Peer Bitcoin Reviews
* [http://howtobuybitcoins.info/ HowToBuyBitcoins.info]
* [http://wheretobuycryptocoins.com WhereToBuyCryptocoins.com]. Shows exchanges, markets, faucets, sites to spend cryptocoins and more.

==See Also==
* [[:Category:Digital_currencies|Digital Currencies]]
* [[Selling bitcoins]]
* [[Secure Trading]]
* [[Bitcoin Ladder]]
* [[:Category:Local|Local]] exchanges

[[Category:Exchanges]]
[[Category:Introduction]]
[[zh-cn:购买bitcoins]]
[[ru:Приобретение биткойнов]]