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judymcconville@roadrunner.com 2017-04-28 10:45:39 -07:00
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@ -279,7 +279,7 @@ image::images/mbc2_0405.png["pubkey_to_address"]
[[base58]] [[base58]]
==== Base58 and Base58Check Encoding ==== Base58 and Base58Check Encoding
In order to represent long numbers in a compact way, using fewer symbols, many computer systems use mixed-alphanumeric representations with a base (or radix) higher than 10. For example, whereas the traditional decimal system uses the 10 numerals 0 through 9, the hexadecimal system uses 16, with the letters A through F as the six additional symbols. A number represented in hexadecimal format is shorter than the equivalent decimal representation. Even more compact, Base64 representation uses 26 lowercase letters, 26 capital letters, 10 numerals, and two more characters such as &#x201c;`+`&#x201d; and "/" to transmit binary data over text-based media such as email. Base64 is most commonly used to add binary attachments to email. Base58 is a text-based binary-encoding format developed for use in bitcoin and used in many other cryptocurrencies. It offers a balance between compact representation, readability, and error detection and prevention. Base58 is a subset of Base64, using the upper- and lowercase letters and numbers, but omitting some characters that are frequently mistaken for one another and can appear identical when displayed in certain fonts. Specifically, Base58 is Base64 without the 0 (number zero), O (capital o), l (lower L), I (capital i), and the symbols &#x201c;`+`&#x201d; and "/". Or, more simply, it is a set of lowercase and capital letters and numbers without the four (0, O, l, I) just mentioned. <<base58alphabet>> shows the full Base58 alphabet. ((("keys and addresses", "bitcoin addresses", "Base58 and Base58check encoding")))((("Base58 and Base58check encoding", id="base5804")))In order to represent long numbers in a compact way, using fewer symbols, many computer systems use mixed-alphanumeric representations with a base (or radix) higher than 10. For example, whereas the traditional decimal system uses the 10 numerals 0 through 9, the hexadecimal system uses 16, with the letters A through F as the six additional symbols. A number represented in hexadecimal format is shorter than the equivalent decimal representation. Even more compact, Base64 representation uses 26 lowercase letters, 26 capital letters, 10 numerals, and two more characters such as &#x201c;`+`&#x201d; and "/" to transmit binary data over text-based media such as email. Base64 is most commonly used to add binary attachments to email. Base58 is a text-based binary-encoding format developed for use in bitcoin and used in many other cryptocurrencies. It offers a balance between compact representation, readability, and error detection and prevention. Base58 is a subset of Base64, using the upper- and lowercase letters and numbers, but omitting some characters that are frequently mistaken for one another and can appear identical when displayed in certain fonts. Specifically, Base58 is Base64 without the 0 (number zero), O (capital o), l (lower L), I (capital i), and the symbols &#x201c;`+`&#x201d; and "/". Or, more simply, it is a set of lowercase and capital letters and numbers without the four (0, O, l, I) just mentioned. <<base58alphabet>> shows the full Base58 alphabet.
[[base58alphabet]] [[base58alphabet]]
.bitcoin's Base58 alphabet .bitcoin's Base58 alphabet
@ -335,7 +335,7 @@ include::code/addr.cpp[]
---- ----
==== ====
The code uses a predefined private key so that it produces the same bitcoin address every time it is run, as shown in <<addr_example_run>>. The code uses a predefined private key so that it produces the same bitcoin address every time it is run, as shown in <<addr_example_run>>.((("", startref="base5804")))
[[addr_example_run]] [[addr_example_run]]
.Compiling and running the addr code .Compiling and running the addr code