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Details about SHA1

Gentoo Mono Handbook
How to obtain source code from GitHub?,
sha1 is described in RFC 3174 (https://tools.ietf.org/html/rfc3174),

The usage of sha1 in git is described in https://illustrated-git.readthedocs.org/en/latest/ with examples and .svg illustrations
Git References - https://git-scm.com/book/tr/v2/Git-Internals-Git-References
    the files that contain the SHA-1 values in the .git/refs directory.