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This white paper focuses on the interoperability of blockchain-based digital currencies, including central bank digital currency (CBDC) and stablecoins. The paper defines interoperability, identifies the key principles and outcomes for interoperability and highlights existing cases and standards. It also explains important technical considerations for interoperability, such as privacy, digital identity, security, and vendor neutrality. The paper is intended for central banks, stablecoin operators and policy-makers.