ChainCatcher news, Italy's state-owned bank Cassa Depositi e Prestiti SpA has just completed a $27.2 million digital bond issuance with the trillion-dollar investment bank Intesa Sanpaolo using Ethereum's Layer 2 Polygon.Intesa Sanpaolo explained in a statement on July 18 that the transaction is part of an experiment conducted by the European Central Bank aimed at determining new solutions for central bank currency settlement for wholesale transactions conducted on the blockchain.The $27.2 million (€25 million) bond from Cassa Depositi will mature on November 18, 2024, with a four-month term and a fixed coupon rate of 3.63%, calculated annually. Intesa Sanpaolo is the sole institutional investor in this experiment.