How does a publisher pay me?
It will depend on the publisher. I highly doubt they would use BitCoin. The product is considered a poor investment for any company, for it has black market intentions and is not traceable.
Most authors are paid directly via cheque. Some small press publishers may use payment methods like PayPal, but also fall back to traditional payments via money order or wire payment depending on the amount being paid.
Your best resource to find out how you will receive royalty payments is to talk with your publisher and ensure that it is written out on the contract. If you don’t have a contract but they are publishing you, then you may not be paid for the work submitted to them.