After Massachusetts Senator Elizabeth Warren's claimed that the Comptroller may have violated US banking laws by approving crypto companies’ charters, The Digital Chamber urged the regulator to defend the applications. Update (May 26 at 9:30 pm UTC): This article has been updated to include statements from The Digital Chamber. The Digital Chamber, a cryptocurrency advocacy group that has been closely involved in negotiations with US lawmakers over digital asset-related legislation, questioned three-term Massachusetts Senator Elizabeth Warren’s understanding of banking laws as applied to crypto companies. In a Tuesday letter to the US Comptroller of the Currency (OCC) Jonathan Gould, Digital Chamber CEO Cody Carbone challenged many of the claims in the Massachusetts lawmaker’s May 18 letter. In that letter, Warren said that the OCC may have violated the National Bank Act by approving national trust charters for nine crypto companies “that intend to engage in activities that appear to go far beyond the narrow set of activities permitted by law.” “The claim that these firms seek to ‘evade’ regulations [...] or pose risks to the safety and soundness of the banking system is contradicted by their own conduct,” Carbone said in his Tuesday letter. “These companies voluntarily sought federal oversight: each applied for a national trust bank charter, submitted to OCC examination authority, and accepted the compliance obligations that come with federal supervision.” Warren’s concerns stemmed from OCC's approving or conditionally approving charter applications from Coinbase, Crypto.com’s parent company, Ripple, Stripe, BitGo, Circle, Fidelity Digital Assets, Protego Holdings and Paxos. She said that the companies “want to evade the fundamental safeguards and obligations that come with being a bank” and questioned what led to the approvals, implying influence from the White House. Related: Crypto PAC money pours into Texas primary runoffs, as prediction markets favor chal