<html xmlns="http://www.w3.org/1999/xhtml"><head></head><body><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="7" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[7]</anchor-end> <dfn><anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">Base58</anchor></dfn> は、58種類の<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">字母</anchor>によって数を表す<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">符号化</anchor>です。58種類の<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">字母</anchor>は<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">アラビア数字</anchor>や<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">ラテン文字</anchor>で、
<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">記号</anchor>や一部の紛らわしい<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">ラテン文字</anchor>を省いており、
<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">プロトコル要素</anchor>としても人間が入力する文字列としてもそこそこ使いやすいのが特徴です。</p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="8" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[8]</anchor-end> <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">Web</anchor> に持ち込んだのはおそらく <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">Flickr</anchor> の <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">API</anchor> のようです。その後の<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">短縮URL</anchor>ブームで多くのサービスで採用されました。
<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">Bitcoin</anchor> でも使われているようです。</p><section><h1>関連</h1><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="9" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[9]</anchor-end> <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">Base85</anchor> とは異なります。</p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="14" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[14]</anchor-end> <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">識別子文字</anchor></p></section><section><h1>メモ</h1><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="1" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[1]</anchor-end> <cite xml:lang="de">Base58 – Wikipedia</cite>
( (<time>2013-11-09 06:07:48 +09:00</time> 版))
<anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="http://de.wikipedia.org/wiki/Base58">http://de.wikipedia.org/wiki/Base58</anchor-external></p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="2" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[2]</anchor-end> <cite xml:lang="en-us">Flickr: Discussing manufacturing flic.kr style photo URLs in Flickr API</cite>
( (<time>2013-12-10 06:57:23 +09:00</time> 版))
<anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="http://www.flickr.com/groups/api/discuss/72157616713786392/">http://www.flickr.com/groups/api/discuss/72157616713786392/</anchor-external></p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="3" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[3]</anchor-end> <cite>Encode::Base58 - search.cpan.org</cite>
( (<time>2013-12-10 06:57:10 +09:00</time> 版))
<anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="http://search.cpan.org/dist/Encode-Base58/lib/Encode/Base58.pm">http://search.cpan.org/dist/Encode-Base58/lib/Encode/Base58.pm</anchor-external></p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="4" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[4]</anchor-end> <cite>flic.kr で使われている base58 のデコードを行う javascript のコード - Underconstruction by Taiyo</cite>
( (<time>2013-12-10 06:58:32 +09:00</time> 版))
<anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="http://d.hatena.ne.jp/t_trace/20090706/p1">http://d.hatena.ne.jp/t_trace/20090706/p1</anchor-external></p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="5" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[5]</anchor-end> <cite>Encode::Base58::GMP - search.cpan.org</cite>
( (<time>2013-12-10 06:59:02 +09:00</time> 版))
<anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="http://search.cpan.org/dist/Encode-Base58-GMP/lib/Encode/Base58/GMP.pm">http://search.cpan.org/dist/Encode-Base58-GMP/lib/Encode/Base58/GMP.pm</anchor-external></p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="6" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[6]</anchor-end> <cite>Encode::Base58::BigInt - search.cpan.org</cite>
( (<time>2013-12-10 06:59:36 +09:00</time> 版))
<anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="http://search.cpan.org/dist/Encode-Base58-BigInt/lib/Encode/Base58/BigInt.pm">http://search.cpan.org/dist/Encode-Base58-BigInt/lib/Encode/Base58/BigInt.pm</anchor-external></p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="13" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[13]</anchor-end> <cite xml:lang="en">Base58Check encoding - Bitcoin Wiki</cite>, <time>2020-01-07T09:14:45.000Z</time>, <time>2020-12-29T09:16:39.603Z</time> <anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="https://en.bitcoin.it/Base58Check_encoding">https://en.bitcoin.it/Base58Check_encoding</anchor-external></p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="10" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[10]</anchor-end> 
<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">短縮URL</anchor>ブームと<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">ビットコイン</anchor>ブームが終わって見なくなった。</p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="11" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[11]</anchor-end> <cite xml:lang="en">draft-multiformats-multibase-02 - The Multibase Data Format</cite>, <time>2020-12-21T02:06:34.000Z</time>, <time>2020-12-29T05:52:41.555Z</time> <anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="https://tools.ietf.org/html/draft-multiformats-multibase-02">https://tools.ietf.org/html/draft-multiformats-multibase-02</anchor-external></p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="12" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[12]</anchor-end> <cite xml:lang="en">The did:key Method v0.7</cite>, <time>2020-12-29T02:18:49.000Z</time>, <time>2020-12-29T06:03:15.757Z</time> <anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="https://w3c-ccg.github.io/did-method-key/#format">https://w3c-ccg.github.io/did-method-key/#format</anchor-external></p></section></body></html>