According to the principles of the Bali Fintech Agenda (BFA), addressing challenges posed by cross-border crypto transactions requires a coordinated, risk-based, and internationally consistent approach.

Establishing consistent taxonomies and mandatory reporting standards helps by:

• Enhancing regulatory clarity: Standardized definitions and classifications of crypto assets improve communication and collaboration between jurisdictions.
• Reducing regulatory arbitrage: Harmonized rules make it harder for actors to exploit differences between regulatory frameworks across borders.
• Improving oversight: Mandating reporting from crypto service providers (e.g., exchanges and wallet providers) enables authorities to monitor transactions and detect illicit activities effectively.

A is incorrect: Transaction limits may temporarily curb some illicit activities but fail to address the root causes, such as inconsistent regulations and lack of transparency in crypto markets. They are also difficult to enforce effectively without global cooperation and standardized reporting mechanisms.

C is incorrect: While a central registry might sound effective, it raises significant practical and privacy concerns. Implementing such a system across jurisdictions is highly complex and may not align with international privacy laws or standards.

D is incorrect: While bilateral agreements can improve enforcement against specific illicit activities, they are not sufficient to address the broader challenges of regulatory arbitrage and inconsistent definitions of crypto assets. A more comprehensive, multilateral approach is required for global coordination, as emphasized by the Bali Fintech Agenda (BFA).