The Blockchain Association filed an amicus brief on August 12, 2026, supporting Custodia Bank in its Supreme Court dispute over access to a Federal Reserve master account—a conflict that has emerged as a defining test of crypto banking access in the United States.

Blockchain Association Joins Custodia's Supreme Court Bid

The trade group's backing comes through an amicus brief entered on the Supreme Court docket, marking the first formal alignment of an industry body with Custodia against the Federal Reserve in this case. The brief signals that the dispute has grown beyond the interests of a single institution to encompass the broader question of whether a crypto-focused bank can secure direct access to the central bank's payment infrastructure.

Custodia operates as a Wyoming-chartered special purpose depository institution (SPDI), a state-level banking charter created specifically for digital asset businesses. Its pursuit of a master account thus tests whether a bank operating under such a charter qualifies for the same central banking privileges available to conventionally chartered institutions.

The intervention also reflects wider scrutiny of how the Federal Reserve evaluates and grants master account applications—a question that has drawn attention from lawmakers, including calls for transparency regarding Kraken's pursuit of Fed master account access.

Path to the Supreme Court

A Federal Reserve master account provides an institution with direct access to the central bank's payment systems, enabling it to settle transactions without relying on an intermediary bank. For crypto-focused institutions, the absence of a master account means routing payments through correspondent banks—a layer of dependence that has left digital asset firms exposed to service disruptions when those intermediary relationships end. The Fed maintains a public database of master account and services access requests.

Custodia's legal challenge progressed through the federal court system before reaching the Supreme Court. A key milestone was a ruling by the U.S. Court of Appeals for the Tenth Circuit, documented in a published Tenth Circuit opinion. The current amicus filing represents the stage at which the Supreme Court is being asked to consider the matter.

The amicus brief was filed on the Supreme Court docket under case number 26-62.

Why Master Account Access Matters

Direct access to the Fed's payment system carries significant operational advantages. It allows a bank to settle payments at the source, reducing costs and settlement times—a capability that directly affects how competitive a crypto-linked institution can be in the financial system. Without that access, firms face higher transaction costs and dependence on third-party banks that can impose their own risk assessments or withdraw services entirely.

The dispute highlights a regulatory tension between expanding banking access for digital asset firms and preserving the Federal Reserve's supervisory authority over institutions operating in the crypto sector. That balance between access and oversight is central to the case.

At this stage, what is publicly known is limited to the existence and framing of the amicus filing. The practical consequences for firms such as Custodia, and for the broader landscape of crypto banking, will depend on how the Supreme Court chooses to proceed. The outcome could also influence how established publicly traded crypto companies navigate the same regulatory framework.