[BitGo becomes the custodian of 21Shares Bitcoin and Ethereum spot ETFs] Golden Finance reported that digital asset custodian BitGo announced that it has become the custodian of four ETF funds, including 21Shares' two US spot ETFs: ARK 21Shares Bitcoin ETF (ARKB) and 21Shares Core Ethereum ETF (CETH). In addition, BitGo also provides custody services for Hashdex and Valkyrie (now Coinshares).