system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:How do signatures prove anything? Are they not easily forged?
gpt
Legally, your signature is any mark you make under the eyes of witnesses with the intent of affirming something.

So the mark itself means nothing. The mark is merely evidence that you had, at the time you made it, the intent of affirming whatever it is to which you affixed the mark.