The most recent filing involving asset manager BlackRock’s attempt to launch a spot Bitcoin exchange-traded fund (ETF) included a “surveillance-sharing agreement” with cryptocurrency exchange Coinbase (NASDAQ:COIN).

According to a June 29 filing with the United States Securities and Exchange Commission (SEC), the Nasdaq stock exchange refiled for a proposed rule change allowing the listing of BlackRock’s Bitcoin (BTC) ETF. The filing included details of a June 8 agreement between the Nasdaq and Coinbase “intended to supplement the exchange’s market surveillance program” and provide access to data on spot BTC trades.