Santander has issued a $20 million bond directly onto the Ethereum blockchain, where it will remain until the end of its one-year maturity
Source: https://cointelegraph.com/news/santander-issues-20-million-end-to-end-blockchain-bond-on-ethereum
Santander Issues $20 Million End-To-End Blockchain Bond on Ethereum
September 12, 2019
CoinTelegraph