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Circle Introduces Bitcoin-Backed Lending Feature via cirBTC Token

Circle has introduced a lending service enabling institutional clients to borrow USDC against wrapped bitcoin collateral, raising potential tax implications in Germany.

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Circle has rolled out a lending mechanism called Digital Asset-Backed Borrowing within its Circle Mint platform. The service allows users to deposit bitcoin to mint a one-to-one backed token known as cirBTC, which is then pledged as collateral on third-party protocols such as Morpho to receive USDC. Circle plans to integrate Aave in the future.

The feature is deployed on the Ethereum network as well as Arc, Circle’s proprietary chain that launched its mainnet on September 16, 2026. Access to the product is limited exclusively to verified institutional clients, with retail investors and entities domiciled in New York state barred from participating. While Circle provides custody of the deposited bitcoin and the front-end interface, the loan terms and interest rates are determined by the connected lending protocols.

The report highlights a significant regulatory distinction regarding tax treatment between jurisdictions. Although marketed in the United States as a non-taxable liquidity option, converting bitcoin into cirBTC is likely treated as a taxable transaction under German income tax regulations, which would reset an investor's standard one-year holding period.

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