Bank of New York Mellon Corp. and Goldman Sachs Group Inc. are collaborating to use blockchain technology to maintain an ownership record of money market funds.

Goldman Sachs and BNY have joined hands to launch digital tokens that mirror shares of money market funds, deepening Wall Street's push to bring blockchain technology into traditional finance.

For all the sci-fi promises about blockchain transforming finance, the reality will be more mundane as thousands of ordinary instruments quietly move to digital ledgers. On Wednesday, it was money market funds.