# File lib/faker/bitcoin.rb, line 23 def base58(str) alphabet = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz' base = alphabet.size lv = 0 str.split('').reverse.each_with_index { |v,i| lv += v.unpack('C')[0] * 256**i } ret = '' while lv > 0 do lv, mod = lv.divmod(base) ret << alphabet[mod] end npad = str.match(/^#{0.chr}*/)[0].to_s.size '1'*npad + ret.reverse end