Here’s a link to a deep dive on the Bitcoin logo:

https://blog.logomyway.com/bitcoin-logo/#:~:text=The%20brainchild%20of%20Bitcoin%2C%20Satoshi,B%20on%20the%20orange%20frame.

I’ll add having been reading old forum posts I don’t recall reading anything about being inspired by the Mastercard logo. I find it more probable that orange is the closest color to gold that actually pops well in a digital context.