To make a supply contract and evidence it, "A" and "B" should/must sign and seal two copies of this contract and (then) each party should keep one of the copies. To make a supply contract and evidence it, "A" and "B" should/must sign and seal two copies of this contract. Each party should retain one of the copies. Evidence it - is ok.

I looked up the dictionary and saw "evidence" can be used as a verb;;; then, how should I correct it? Can I use "prove" instead of "evidence". It is a sentence from a business contract.

Evidence ""it"" ?? ...it should not be used after the term evidence..! Otherwise it is correct.