When I have used Crypto I have got their Crypto address in my PM conversation and then once I've sent I get the Transaction info from the blockchain using something like Etherscan. Then you can prove you sent the funds to the address they gave you and it's on the block.
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I should add, the site does not handle any payments what-so-ever. This is a peer to peer system so the site just plays a match-maker type of role.
Ahh, that makes sense. Hopefully the other person is honest and actually sends you the item. :)