Ethena is a protocol on the Ethereum blockchain designed to offer a synthetic dollar, aiming to create a cryptocurrency-based solution for a stable currency that operates independently of the traditional banking system. It introduces the concept of the 'Internet Bond', a savings instrument denominated in dollars, accessible globally, and built to provide a crypto-native way to save and earn interest without relying on conventional financial infrastructures.

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The Russian Ruble (RUB) is the official currency of Russia, issued by the Central Bank of Russia. It is widely used in trade across Eastern Europe and Asia, especially in energy markets. In the crypto space, RUB trading pairs are available on select exchanges, and Russia has explored blockchain-based financial systems as part of its digital economy initiatives.