[1] Base 36 - Wikipedia, the free encyclopedia ( (2013-12-26 13:09:34 +09:00 版)) http://en.wikipedia.org/wiki/Base_36

[2] 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

[3] Address IPFS on the Web | IPFS Docs, 2023-08-10T03:03:52.000Z https://docs.ipfs.tech/how-to/address-ipfs-on-web/#native-urls

Some user agents will force-lowercase the CID component of URL-like address. To ensure interop with existing libraries and software, use case-insensitive CID encoding. Use of CIDv1 in Base32 or Base36 is advised.