Base58是用于Bitcoin中使用的一种独特的编码方式，主要用于产生Bitcoin的钱包地址。相比Base64，Base58不使用数字"0"，字母大写"O"，字母大写"I"，和字母小写"l"，以及"+"和"/"符号。
设计Base58主要的目的是：
以下引用自其作者Satoshi Nakamoto在base58.h中的注释：
//// Why base-58 instead of standard base-64 encoding?// - Don't want 0OIl characters that look the same in some fonts and// could be used to create visually identical looking account numbers.// - A string with non-alphanumeric characters is not as easily accepted as an account number.// - E-mail usually won't line-break if there's no punctuation to break at.// - Doubleclicking selects the whole number as one word if it's all alphanumeric.//
5.858bit。经过Base58编码的数据为原始的数据长度的
倍，稍稍多于Base64的1.33倍。