Bitcoin Wiki - User contributions [en]

Talk:Mining hardware comparison

2011-05-09T21:40:54Z

TiagoTiago:

Question about mega-hashes per Watt versus mega-hashes per Joule. Does anyone have an opinion? Most people know what a Watt is but I think seeing MHash/J could be confusing to some people. While perhaps being more accurate, using "/J" might go over some people's heads, especially since the edit was given with little to no explanation. [[User:Vast|Vast]] 06:45, 19 April 2011 (GMT)
: How about adding a note about what a Joule is somewhere people will see? --[[User:TiagoTiago|TiagoTiago]] 21:40, 9 May 2011 (GMT)

Is the note about the AMD Stream SDK valid anymore? Looking down the list it seems people are doing just as well and sometimes better on the 2.3 and 2.4 SDK as compared to the 2.1. [[User:Tybeet|Tybeet]] 23:04, 5 May 2011 (GMT)

User:TiagoTiago/things/unpaidwikipediatranslators

2011-05-01T14:21:34Z

TiagoTiago:

Please add your details bellow, including a link the post where you announce you did the translation, and place a <nowiki><hr></nowiki> above and bellow what you wrote; and of course don't mess with the details of others.

ps: i make no promises, and this probably will be pointless.

--[[User:TiagoTiago|TiagoTiago]] 14:20, 1 May 2011 (GMT)

<hr><hr><hr>

User:TiagoTiago/things/unpaidwikipediatranslators

2011-05-01T14:13:36Z

TiagoTiago: Created page with "Please add your details bellow, including a link the post where you announce you did the translation, and place a <nowiki><hr></nowiki> above and bellow what you wrote; and of co..."

Talk:Bitcoin symbol

2011-04-26T15:23:45Z

TiagoTiago: /* Pros and cons as different collums? */ new section

== ϭ has relation to bitcoin ==

<font style="font-size:1.5em;">ϭ</font> actually does have a visible relation to bitcoin, seeing as it is the lower-case russian B. :)

== Pros and cons as different collums? ==

I think it would be better if the pros and cons were in sepparate colums to make it easier to evaluate the proposals; what do you say? --[[User:TiagoTiago|TiagoTiago]] 15:23, 26 April 2011 (GMT)

Bitcoin symbol

2011-04-26T15:20:50Z

TiagoTiago: /* Unicode symbol */ fixed the alt text of the b'at image

There is no official Bitcoin symbol as of December 2010, however the ''BTC'' abbreviation is the most universally accepted form.

== Unicode symbol ==

There is a discussion over [http://www.bitcoin.org/smf/index.php?topic=369.0 which Unicode symbol might be the best suited] for bitcoin.

To type Unicode characters, refer to:

* [[Microsoft Windows Unicode Input]]
* [[How to easily type the circled B symbol on a Mac]]

It has lead to the following options:

{| class="wikitable sortable"
|-
! Proposed character !! Description & Pros & Cons !! Unicode name !! Unicode decimal input !! Unicode hex input
|-
| ฿ ||
* Pros: Gives a currency-like look (it is the symbol for an existing currency, the Thai Baht, but other currency symbols often get reused, like the $); displayed correctly on all known OSes
* Cons: It is already used for the Thai currency, and might confuse people
|| THAI CURRENCY SYMBOL BAHT || || Alt +0E3F
|-
| Ⓑ ||
*Pros: Similar to current bitcoin.org logo
|| CIRCLED LATIN CAPITAL LETTER B || || Alt +24B7
|-
| ⓑ ||
*Pros: Small b represent the unit bit in computer where capital B is Byte
* Cons: Small fonts are harder to read
|| CIRCLED LATIN SMALL LETTER B || ||Alt +24D1
|-
|ᴃ|| || LATIN LETTER SMALL CAPITAL BARRED B || ||Alt +1D03
|-
|Ƀ|| || LATIN CAPITAL LETTER B WITH STROKE || ||Alt +0243
|-
|B⃦|| || || ||
|-
|␢|| || (Unicode Block: Control Pictures) BLANK SYMBOL (graphic for space) || || Alt +2422
|-
|β|| || GREEK SMALL LETTER BETA || ||Alt +03B2
|-
|¤|| || CURRENCY SIGN ||Alt 0164 ||Alt +00A4
|-
|Ƅ|| || LATIN CAPITAL LETTER TONE SIX || ||Alt +0184
|-
|∄|| || (Unicode Block: Mathematical Operators) THERE DOES NOT EXIST || ||Alt +2204
|-
|ઘ|| || GUJARATI LETTER GHA (Indo-Aryan language) || ||Alt +0A98
|-
|ϭ|| || (Unicode Block: Greek and Coptic) COPTIC SMALL LETTER SHIMA || ||Alt +03ED
|-
|[[Image:Bitcoin Symbol Suggestion circled struck-through B.png|20px]]||
* Cons: Does not exist in the Unicode standard
|| || ||
|-
|[[Image:Bitcoin Symbol Suggestion rotated power.png|20px]]||
* Cons: Does not exist in the Unicode standard
|| || ||
|-
|ⓢ|| Purposed as a smaller unit of bitcoin. E.g. A hundredth of a bitcoin || CIRCLED LATIN SMALL LETTER S || || Alt +24E2
|-
|[[Image:Bat.png|32x32px|alt=The b'at]]
the b'at
||
* Pros: Is round like a coin. Contains the B for Bitcoin. Borrows a style widelly associated with the internet. Not used for other meanings.
* Cons: Does not exist in the Unicode standard
|| || ||
|-
|A 'C' with '1' and '0' inside [[http://img829.imageshack.us/img829/8840/bitcoinlogodraft.png]]||
* Cons: Does not exist in the Unicode standard
|| || ||
|-
|A 'C' with a 'circle' and 'dot' inside [[http://img836.imageshack.us/img836/6006/bitcoinlogodraftii.png]]||
* Cons: Does not exist in the Unicode standard
|| || ||
|-
| ◪|| || (Unicode Block: Geometric Shapes) SQUARE WITH LOWER RIGHT DIAGONAL HALF BLACK || || Alt +25EA
|-
|[[http://hosting11.imagecross.com/image-hosting-61/2381unicode1s.png]][[http://hosting11.imagecross.com/image-hosting-61/162bitcoin_uni_s.png]]||
* Cons: Does not exist in the Unicode standard
|| || ||
|-
|☺|| ||WHITE SMILING FACE|| || Alt +263A
|-
|☻|| ||BLACK SMILING FACE|| || Alt +263B
|-
|㋡|| ||CIRCLED KATAKANA TU' (Japanese)|| || Alt +32E1
|-
| || || || ||
|}

Bitcoin symbol

2011-04-26T15:18:42Z

TiagoTiago: /* Unicode symbol */ reduced the size of the b'at image on the page so it doesn't stand out so much

There is no official Bitcoin symbol as of December 2010, however the ''BTC'' abbreviation is the most universally accepted form.

== Unicode symbol ==

There is a discussion over [http://www.bitcoin.org/smf/index.php?topic=369.0 which Unicode symbol might be the best suited] for bitcoin.

To type Unicode characters, refer to:

* [[Microsoft Windows Unicode Input]]
* [[How to easily type the circled B symbol on a Mac]]

It has lead to the following options:

{| class="wikitable sortable"
|-
! Proposed character !! Description & Pros & Cons !! Unicode name !! Unicode decimal input !! Unicode hex input
|-
| ฿ ||
* Pros: Gives a currency-like look (it is the symbol for an existing currency, the Thai Baht, but other currency symbols often get reused, like the $); displayed correctly on all known OSes
* Cons: It is already used for the Thai currency, and might confuse people
|| THAI CURRENCY SYMBOL BAHT || || Alt +0E3F
|-
| Ⓑ ||
*Pros: Similar to current bitcoin.org logo
|| CIRCLED LATIN CAPITAL LETTER B || || Alt +24B7
|-
| ⓑ ||
*Pros: Small b represent the unit bit in computer where capital B is Byte
* Cons: Small fonts are harder to read
|| CIRCLED LATIN SMALL LETTER B || ||Alt +24D1
|-
|ᴃ|| || LATIN LETTER SMALL CAPITAL BARRED B || ||Alt +1D03
|-
|Ƀ|| || LATIN CAPITAL LETTER B WITH STROKE || ||Alt +0243
|-
|B⃦|| || || ||
|-
|␢|| || (Unicode Block: Control Pictures) BLANK SYMBOL (graphic for space) || || Alt +2422
|-
|β|| || GREEK SMALL LETTER BETA || ||Alt +03B2
|-
|¤|| || CURRENCY SIGN ||Alt 0164 ||Alt +00A4
|-
|Ƅ|| || LATIN CAPITAL LETTER TONE SIX || ||Alt +0184
|-
|∄|| || (Unicode Block: Mathematical Operators) THERE DOES NOT EXIST || ||Alt +2204
|-
|ઘ|| || GUJARATI LETTER GHA (Indo-Aryan language) || ||Alt +0A98
|-
|ϭ|| || (Unicode Block: Greek and Coptic) COPTIC SMALL LETTER SHIMA || ||Alt +03ED
|-
|[[Image:Bitcoin Symbol Suggestion circled struck-through B.png|20px]]||
* Cons: Does not exist in the Unicode standard
|| || ||
|-
|[[Image:Bitcoin Symbol Suggestion rotated power.png|20px]]||
* Cons: Does not exist in the Unicode standard
|| || ||
|-
|ⓢ|| Purposed as a smaller unit of bitcoin. E.g. A hundredth of a bitcoin || CIRCLED LATIN SMALL LETTER S || || Alt +24E2
|-
|[[Image:Bat.png|32x32px|The b'at]]
the b'at
||
* Pros: Is round like a coin. Contains the B for Bitcoin. Borrows a style widelly associated with the internet. Not used for other meanings.
* Cons: Does not exist in the Unicode standard
|| || ||
|-
|A 'C' with '1' and '0' inside [[http://img829.imageshack.us/img829/8840/bitcoinlogodraft.png]]||
* Cons: Does not exist in the Unicode standard
|| || ||
|-
|A 'C' with a 'circle' and 'dot' inside [[http://img836.imageshack.us/img836/6006/bitcoinlogodraftii.png]]||
* Cons: Does not exist in the Unicode standard
|| || ||
|-
| ◪|| || (Unicode Block: Geometric Shapes) SQUARE WITH LOWER RIGHT DIAGONAL HALF BLACK || || Alt +25EA
|-
|[[http://hosting11.imagecross.com/image-hosting-61/2381unicode1s.png]][[http://hosting11.imagecross.com/image-hosting-61/162bitcoin_uni_s.png]]||
* Cons: Does not exist in the Unicode standard
|| || ||
|-
|☺|| ||WHITE SMILING FACE|| || Alt +263A
|-
|☻|| ||BLACK SMILING FACE|| || Alt +263B
|-
|㋡|| ||CIRCLED KATAKANA TU' (Japanese)|| || Alt +32E1
|-
| || || || ||
|}

Talk:In-store Transactions

2011-03-13T17:34:57Z

TiagoTiago: Bitcard?

==Bitcard?==
Should [http://www.bitcoin.org/smf/index.php?topic=4148.0 Bitcard] be included on this article? --[[User:TiagoTiago|TiagoTiago]] 17:34, 13 March 2011 (GMT)

In-store Transactions

2011-03-13T17:21:00Z

TiagoTiago: tweaked the TOC

A common question people have about BitCoin is how it can be used for in-person transactions, like at a supermarket.

Today, BitCoin is software that runs on your desktop or laptop computer. You can also host your wallet with an online service like MyBitcoin. Neither solution is convenient for the supermarket use case. The most commonly proposed solutions are:

__TOC__

We examine these solutions here.

== Smart cards ==

Today one of the most common ways to pay in supermarkets is with cards you either swipe (magstripe cards) or insert into a reader and enter a PIN (smartcards). It's natural to think of applying the same techniques to BitCoin, for instance by putting the private keys inside the card.

Unfortunately there is no decentralized way to create such a system. The EMV smartcard framework used throughout Europe today is a combination of standards created by the major card processors that covers not just smartcards but also the readers as well, for instance to try and ensure tamper resistance.

Without central certification of what EMV calls ''payment entry devices'' (PEDs), anyone is free to create a PED that ''looks'' real, and displays the transaction you expect to be paying on screen, but actually sends an entirely different transaction to be signed by the card. The system is only secure when the readers can be trusted. Even if some central authority certifies PEDs, if their tamperproofing fails the certification is worthless. The tamperproofing done by Ingenico and others on their EMV PEDs turned out to be insufficient and has been attacked several times, in one notable incident, readers had GSM taps installed at the factory before distribution.

It's worth noting that the physical smart card form is an accident of history. VISA already offers [http://usa.visa.com/personal/cards/paywave/micro_tag.html keyfobs] that do the same thing but use near-field communication (NFC) technology.

== Paper BitCoins ==

Another common way to pay at the supermarket is with paper money. There have been various efforts to allow BitCoins to be printed out and passed around, for instance [http://www.bitcoin.org/smf/index.php?topic=3716.0 this one]. The private keys are printed on the paper.

But paper money is secure (or secure enough) only through huge anti-counterfeiting efforts by a large central authority, in the USA this is the Secret Service. The techniques of making paper money hard to forge are not widely available. Putting private keys on the paper itself simply means anyone who receives the note can take away the underlying BitCoins backing it.

== Smart phones ==

The best solution is to use smart phones. Communication can be via unencrypted Bluetooth or using NFC. Near field communications is a form of radio that travels only a few centimeters, so to use it devices must be touched together. In such a setup, you touch your phone to another NFC aware device like another phone, or for the supermarket a simple NFC transmitter. That device sends a BitCoin address and a requested amount, which is displayed on the devices screen. Confirming the payment causes the phone to create, sign and broadcast the BitCoin transaction as normal. The supermarkets BitCoin node will receive the transaction a few seconds later.

To ensure you're paying who you think you're paying, the address can itself be signed with an 'extended validation' certificate as issued by various SSL certificate authorities. The EV standard and auditing process ensures they are only issued to organizations that can prove their identity to a high level of assurance. The phone can then show the organizational name rather than the raw BitCoin address.

Because you own the device and carry it with you, there's no risk of a corrupt merchant or criminal tampering with the device when you are not around to see it, as has happened with smart card readers. Modern phones can encrypt locally stored data like a wallet such that it can't be extracted unless the right PIN is provided. Whilst physical tamper resistance isn't as strong as with a smartcard, it's probably strong enough to ensure that if a phone is stolen, there is sufficient time to reach a backup and move the coins in it to a new address rendering the stolen wallet worthless.

This solution has another advantage over smart cards - namely that the hardware to do it is being mass manufactured and many people have access to it. This means that in person transactions don't require any complex setup or special hardware. You can pay your friends in the pub as easily as you can pay the supermarket.

[[Category:Technical]]

Units

2011-03-08T00:04:31Z

TiagoTiago: Undo revision 5053 by Luke-jr (talk) Please discuss on the talk page whether to leave or remove the note.

{| class="wikitable"
|-
! Please note that the contents of this page is only a proposal, and in no way an official standard; at the time of writing it's not even all that popular.
|}

{| border="1" style="text-align:right;font-family:Console, Luxi Mono, fixed"
|- style="background-color:silver"
! Abbreviation
! Pronunciation
! style="background-color: #7fdfdf" | Decimal (BTC)
! style="background-color: #7fdf7f" | [[Tonal BitCoin|Tonal (TBC)]]
! Tonal, as Hexadecimal
|-
|colspan="2"| Maximum BitCoins ever
| 20,999,999.9769    
| 7,750,54.00 
| 7,75f0,59e4.009 
|- style="background-color:lime"
|
| Tam-BitCoin
| 2,814,749.76710656
| 1,0000,0000     
| 1,0000,0000     
|- style="background-color:cyan"
| MBTC
| Mega-BitCoin
| 1,000,000         
| 593,1079.4   
| 5af3,107a.4   
|- style="background-color:cyan"
| kBTC
| Kilo-BitCoin
| 1,000         
| 17,4876.8  
| 17,4876.e8  
|- style="background-color:cyan"
| hBTC
| Hecto-BitCoin
| 100         
| 2,540.4  
| 2,540b.e4  
|-
|colspan="2"| Initial block reward
| 50         
| 1,2905.2  
| 1,2a05.f2  
|- style="background-color:lime"
| ᵇTBC
| Bong-BitCoin
| 42.94967296
| 1,0000     
| 1,0000     
|- style="background-color:cyan"
| daBTC
| Deca-BitCoin
| 10         
| 39.9  
| 3b9a.ca  
|- style="background-color:lime"
| ᵐTBC
| Mill-BitCoin
| 2.68435456
| 1000     
| 1000     
|- style="background-color:cyan"
| BTC
| *BitCoin
| 1         
| 55.1  
| 5f5.e1  
|- style="background-color:lime"
| ˢTBC
| San-Bitcoin
| 0.16777216
| 100     
| 100     
|- style="background-color:cyan"
| dBTC
| Deci-BitCoin
| 0.1       
| 8.68 
| 98.968 
|- style="background-color:lime"
| ᵗTBC
| Ton-BitCoin
| 0.01048576
| 10     
| 10     
|- style="background-color:cyan"
| cBTC
| Centi-BitCoin
| 0.01      
| .424 
| f.424 
|- style="background-color:cyan"
| mBTC
| Milli-BitCoin
| 0.001     
| 1.869 
| 1.86a 
|- style="background-color:lime"
| TBC
| *BitCoin
| 0.00065536
| 1     
| 1     
|- style="background-color:lime"
| TBCᵗ
| BitCoin-ton
| 0.00004096
| 0.1   
| 0.1   
|- style="background-color:lime"
| TBCˢ
| BitCoin-san
| 0.00000256
| 0.01  
| 0.01  
|- style="background-color:cyan"
| μBTC
| Micro-BitCoin
| 0.000001  
| 0.0064
| 0.0064
|- style="background-color:lime"
| TBCᵐ
| BitCoin-mill
| 0.00000016
| 0.001 
| 0.001 
|- style="background-color:lime"
| TBCᵇ
| BitCoin-bong
| 0.00000001
| 0.0001
| 0.0001
|}
<small>* Tonal BitCoin and Decimal BitCoin can be differentiated by the pronunciation of the numbers. "One bitcoin", "two bitcoin", etc is decimal, but "an bitcoin", "de bitcoin" is tonal.</small>

Units

2011-03-07T19:37:48Z

TiagoTiago: Note: it's not official

File:Bat.png

2011-02-20T10:42:33Z

TiagoTiago: how i created this

== Summary ==
A rough rendition of the idea of the b'at symbol, and @ with the "a" replaced with a "b" (i created this using the b and @ of the Comics Sans font, removing the a part, merging the b, and tweaking where the tail meets the b, and a few little distortions of the b itself to fit better inside the tail).
== Licensing ==
{{self|Cc-zero}}

Bitcoin symbol

2011-02-20T10:40:30Z

TiagoTiago: The b'at

File:Bat.png

2011-02-20T10:37:09Z

TiagoTiago: A rough rendition of the idea of the b'at symbol, and @ with the "a" replaced with a "b"

== Summary ==
A rough rendition of the idea of the b'at symbol, and @ with the "a" replaced with a "b"
== Licensing ==
{{self|Cc-zero}}