yes a piece of paper certified by a notary...
ok, im new here, my english is not the best.. maybe u can Help me, what i need to do for safety?
i have think a contract certified by a notary is enought...
I will give u all my Safety what i can just tell me what

I will lend you 2BTC if you put $22,000 (thats USD) into an escrow account, or you put the same amount of ETH/LTC/VIA or XMR with an escrow.
if you cannot do any of the above then you haven't read the rules and deserve to be rapped by 100 sheep!