Sign Your John Henry

I have heard of the phrase sign your John Hancock
And this is in reference to the way he signed in big and bold letters
But I also have heard of sign your John Henry is this in reference to
John Henry being a very big man and hero?
Can you help?

I think "John Henry" as a phrase meaning signature is simply a mistake. People get their Johns mixed up. But I'll check further and see if there's more to it than that.

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