Do bitcoin transactions require a processing fee?
When delving into the nuances of cryptocurrency transactions, it's often perplexing to decipher the complexities involved. Could you clarify whether Bitcoin transactions indeed require a processing fee? Given the decentralized nature of the blockchain, I'm curious if these fees are mandatory or optional, and if so, what factors determine their amount. Additionally, are these fees static or do they fluctuate based on network congestion or other variables? Understanding these intricacies is crucial for anyone involved in the crypto world, so I'd appreciate a thorough explanation.