What is natural PHA?

Excuse me, could you please clarify what you mean by "natural PHA"? As far as I'm aware, "PHA" isn't a widely recognized term in the cryptocurrency or finance industry. Are you perhaps referring to a specific project, protocol, or acronym related to blockchain technology or digital assets? If so, could you provide more context or background information so that I can give you a more accurate answer? Additionally, it's worth noting that "natural" is often used to describe something that is found in nature or occurs without human intervention, but it's not a term that's typically associated with cryptography, finance, or blockchain technology.