The Shanghai upgrade allowed Ethereum stakers to finally withdraw their funds from the mainnet. Some had been waiting to do so since the staking feature was first introduced in December 2020. Perhaps the most important development revealed by the event is that Kraken U.S. staking customers appear to have been more or less flushed from the system. This is because of regulatory action taken against the crypto exchange, which saw it settle with the SEC for $30 million and shutter its staking operations for Americans back in February.