A method of transferring cryptocurrency credits employs leaf blocks to transfer cryptocurrency credits which are settled by cryptocurrency through blockchain transaction(s). It comprises: maintaining two types of accounts—one for cryptocurrency and the other for cryptocurrency credits; creating at least a leaf block, by a sending financial institution, containing a plurality of business transactions that intend to transfer customers' cryptocurrency credits to customers at a receiving financial institution; calculating a mathematical summary of said leaf block; creating at least a blockchain transaction tying to said leaf block through said mathematical summary serving as a settlement to said leaf block; submitting said blockchain transaction to a blockchain; sharing said leaf block with the receiving financial institution; accessing said leaf block by the receiving financial institution, validating it and crediting transaction amounts in it to corresponding customer accounts at the receiving financial institution. A system configured to implement said method.