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[1] 二進法 - Wikipedia (2018-12-08 11:22:22 +09:00) https://ja.wikipedia.org/wiki/%E4%BA%8C%E9%80%B2%E6%B3%95
[3] draft-multiformats-multibase-02 - The Multibase Data Format, 2020-12-21T02:06:34.000Z, 2020-12-29T05:52:41.555Z https://tools.ietf.org/html/draft-multiformats-multibase-02