And my memory of Florida law (when I was signing an apartment rental contract 4 years ago) was that any electronic signature agreed to by the contracting parties was valid. So I simply typed my name in the contract, emailed it to my landlord, and we were done.
Of course, I also used https:/.opentimestamps.org to store the hash of our contract on bitcoin's block chain, because that way we both had proof that the contract existed in a certain form on that date. (I never needed that proof, because he was a good landlord, and I paid rent on time.)
While probably enough to prove it existed, you'd probably need to pay a lot for an expert witness to testify to "hash of file on blockchain means it existed" if you did have to go to court over the existence of the contract.
Of course, I also used https:/.opentimestamps.org to store the hash of our contract on bitcoin's block chain, because that way we both had proof that the contract existed in a certain form on that date. (I never needed that proof, because he was a good landlord, and I paid rent on time.)