Cryptocurrency exchange Coinbase is doubling down on its support of global spot Bitcoin exchange-traded funds (ETF), becoming a custody partner for a Bitcoin ETF in Australia. Australia’s DigitalX, the issuer of the spot Bitcoin ETF called DigitalX Bitcoin ETF (BTXX), has selected Coinbase as the custody provider for its spot Bitcoin (BTC) fund, according to the official BTXX fact sheet. Launched on July 12, the DigitalX Bitcoin ETF aims to provide returns that mirror the performance of Bitcoin by maintaining long-term holdings of BTC. DigitalX announced it received approval to list its spot B…