[rymnc]

This pull request performs a factual audit and significant content update of the Private FX use case documentation. It adds up-to-date statistics, clarifies regulatory reporting requirements, and expands on industry context and recommended approaches for privacy-preserving FX settlement on blockchain. The most important changes are:

Content and Data Updates:

• Updated the introduction in private-fx.md with current FX market size and stablecoin statistics, citing BIS sources.
• Added context on the US dollar’s dominance, CLS PvP settlement, and Swift’s blockchain initiatives, with recent references.

Regulatory and Compliance Clarifications:

• Expanded the regulatory reporting section to detail EMIR, MiFID II, Dodd-Frank, and US/EU spot FX practices, with direct links to legal sources.

Technical and Industry Recommendations:

• Updated recommended approaches to specify privacy-preserving PvP via ERC-7573, and added cross-network settlement options and their recovery paths.
• Refreshed market context and standards, referencing Swift’s tokenized-deposit pilot and clarifying the scope and limitations of ERC-7573.

Changelog:

• Documented the factual audit and update of the Private FX entry in CHANGELOG.md.