What's in a signature? Turns out: A lot of history!  Everything from identity verification to slaps are what makes signatures so valuable. 

https://legalesign.com/blog/history-of-signatures/?amp=1

https://slate.com/news-and-politics/2011/03/when-did-we-start-signing-our-names-to-authenticate-documents.html

https://en.m.wikipedia.org/wiki/Signature

https://www.etymonline.com/word/signature

https://www.npr.org/2018/11/25/670631106/the-history-of-signatures-and-their-present-relevance

https://www.helpsystems.com/resources/articles/infographic-history-signature

https://en.m.wikipedia.org/wiki/Seal_(emblem)

https://blog.thegrizzlylabs.com/2020/11/history-of-signatures.html