Interoperability with existing systems and other blockchains is important. APIs or middleware might allow integration with ERP or SaaS platforms. Maybe they use standard protocols like Hyperledger or Ethereum but with custom security layers.

Now, I have enough to write the article. I need to cite sources.

Now, I need to search for "GSPBB" in the context of the Argentine port operator. I'll open result 0 from search 6. PDF about the Navy experiment mentions "GSPBB facility". That might be a typo for "GSBPP" (Graduate School of Business and Public Policy).