Golden Finance Report. According to monitoring data from Farside Investors, the fund data for the US spot Bitcoin ETF and spot Ethereum ETF yesterday (December 18) is as follows: Spot Bitcoin ETF: GBTC net outflow of 35.9 million USD, BITB net outflow of 16.6 million USD, BTC with no inflow or outflow. Spot Ethereum ETF: ETHE net outflow of 49.2 million USD, ETHW net outflow of 14.6 million USD, ETH net outflow of 15.6 million USD.