I'm pretty sure you can't trace a bitcoin address to a person or IP. It's all so anonymous.
Like if I went on my bros computer and sent all his bitcoins to me, there's no way to track it and no way for him to track me. Also he can't refund it.
You're fine.
Sure noone can know, right?
Lets take a random block
https://blockchain.info/block-index/455572/0000000000000001250cf6d845ee1030796ca5b56a6ca10bca45890617a22ca9
and a "random" transaction
https://blockchain.info/tx/b835ae361016bfe9cc35487c68455fde9e0872d30f14efa1f4a7456ef0f904b7
and click on "view tree chart"
https://blockchain.info/tree/105565477
no ip adresses there, no, you cant trace anyone with this blockchain thingy, everything is anonymous, nothing to see here, please continue with your life.