Is that base on nike logo cause it looks like it, with a nice design someone would really love to buy your items, however if that design is stolen, I don't think you would profit for selling those, but you might as well charge with copyrights infringement.
P.S Really want to hear your answer. Cheers
Yes using the Nike logo is the violation of their trademark unless they have ties up with the Nike and for sure they have not done it. They would say that they have put colors in that logo so they are not copying the exact but still any body looking at it can tell what is that logo about.
I think instead of that OP you should have either created your own logo or used the B sign of Bitcoin to make it purely a bitcoin tshirt.