When Block filed with the Office of the Comptroller of the Currency on September 8 to charter Builders Bank & Trust, it joined a queue that has quietly become the most consequential structural shift in crypto infrastructure this year. Circle received final OCC approval in July. Ripple, Paxos, BitGo and Fidelity Digital Assets hold conditional approvals. Revolut and OpenReserve cleared conditional stages in the first week of September. The migration of digital asset custody from state money transmitter licenses to federally chartered trust banks is no longer a trend piece. It is the new baseline, and it changes who regulates crypto’s most sensitive function, under what rules, and with what consequences when something breaks.
What a national trust bank actually is
Strip away the banking vocabulary and the structure is narrow. An uninsured national trust bank takes no deposits and makes no loans. It cannot fail the way a commercial bank fails, because there is no deposit base to run on and no loan book to mark down. Its business is holding assets on behalf of clients and executing fiduciary duties over them. For crypto, that means cold storage of bitcoin, custody of stablecoin reserves, and the record-keeping that institutions require before they will touch digital assets at all.
The “uninsured” label scares retail readers, but it is the wrong thing to focus on. FDIC insurance covers deposits, and there are none. What matters is the other side of the charter: a federal capital requirement, governance standards the OCC enforces, and examination authority. An OCC examiner can walk into a federally chartered trust bank and read its books. That is the product being sold, and it is a product the state licensing system never offered.
The patchwork Block is escaping
Block’s motivation is the clearest illustration of why firms are lining up. The company currently operates its bitcoin custody across more than 50 state money transmitter licenses. Each license means a separate compliance regime, a separate renewal cycle, and a separate set of state examiners with separate expectations. The burden is not only administrative. Divergent state rules mean a product feature lawful in one state can require redesign in another. Multistate examinations pull engineering and legal staff into recurring audits indefinitely.
A single national charter replaces all of it. And the OCC removed the last legal obstacle in June with Interpretive Letter 1192, which confirmed that a federally chartered bank may conduct authorized activities in any state without a state money transmitter license, regardless of state objections. Before that letter, a national charter still had to negotiate with every state individually, which would have gutted the entire value proposition. After it, the charter strategy became genuinely viable, and the applications followed within weeks.
The queue, in one table
| Firm | OCC status | Focus |
|---|---|---|
| Circle | Final approval, July 2026 | Stablecoin issuer, USDC reserves |
| Ripple | Conditional approval | Payments, custody |
| Paxos | Conditional approval | Stablecoin issuance, settlement |
| BitGo | Conditional approval | Institutional custody |
| Fidelity Digital Assets | Conditional approval | Institutional custody |
| Revolut Bank US | Charter application, decision Sept. 2 | Consumer banking |
| OpenReserve | Preliminary approval | Digital asset reserve banking |
| Block (Builders Bank) | Application filed Sept. 8 | Bitcoin and stablecoin custody |
Read down the list and the pattern is hard to miss. These are not speculative crypto startups. They are the firms that already hold most of the industry’s institutional assets, converting an unstable state-by-state permission structure into permanent federal charters. The OCC, for its part, has chartered two new national banks in the first week of September alone.
Why custody is the battleground
Custody is the layer every other crypto business depends on, and it is the layer where failure is unrecoverable. An exchange can suspend withdrawals and later restore them. A custodian that loses keys or suffers an insider theft has lost client assets permanently, and no insurance fund of realistic size makes clients whole at institutional scale. That asymmetry is why institutional allocators, corporate treasurers and auditors treat custodian quality as a gating decision.
Until recently the answer to “who regulates your custodian” was a list of state agencies, each with partial oversight. Coinbase Custody and Fidelity Digital Assets dominated the market under exactly that structure, including custody of most spot bitcoin ETF assets. The charter wave does not displace them immediately, but it changes the terms of competition. A federally examined trust bank is an easier entity for a pension fund’s board to approve, an easier line for an audit letter, and a cleaner answer to the counterparty question that has kept some of the largest pools of capital on the sidelines.
There is a regulatory logic working in the same direction. Stablecoin legislation passed this year gave issuers a federal path. The SEC has proposed letting blockchains serve as official share ledgers, which would push tokenized securities into mainstream volume and make custody of those tokens a regulated-fund-scale problem. Corporate bitcoin treasuries keep accumulating. Every one of those trends increases demand for custody that a federal examiner has signed off on.
What the charter does not fix
Honesty requires listing the limits. A trust charter does not insure client assets against theft or mismanagement. It does not create a bailout facility. It does not resolve the question of what happens to custodied assets if the custodian’s parent company fails, a question that haunted crypto through the FTX collapse and remains legally unsettled in bankruptcy proceedings. Federal examination reduces the probability of operational failure. It does not eliminate loss.
The charter also does not settle the deeper regulatory argument about whether crypto firms should hold banking charters at all. Critics, including some state regulators, argue the OCC is chartering entities that exist precisely to escape state oversight, and that custody concentrated in a handful of federally chartered trusts creates systemic concentration the FDIC and the Fed cannot see into. Those objections have not slowed the queue, but they will surface in litigation or legislation eventually.
The Block specifics
Block’s version of the play has details worth noting. Builders Bank would be led by Lee Woolley, Block’s digital asset strategy lead, who previously ran the Treasury Department Federal Credit Union and held senior roles at Northern Trust and BNY Mellon. The staffing choice is deliberate: traditional banking credentials aimed at the institutional buyers the charter is meant to win. “We look forward to working with the OCC as we pursue a charter designed to support the secure custody of assets for Block and its customers,” Woolley said in the announcement.
Block also brings something the other applicants lack: Square Financial Services, its existing industrial bank, gives the company a working relationship with federal banking regulators. Builders Bank extends that relationship into digital assets rather than starting from zero. And the commercial logic is direct. Cash App’s bitcoin revenue has normalized from its boom levels, and regulated custody lets Block serve institutional clients it currently cannot reach under money transmitter licenses.
What to watch
Three things will tell you whether this wave consolidates or stalls. First, the OCC’s processing speed: Circle’s final approval took years from first application, and if the current queue faces similar timelines, the strategic advantage dilutes. Second, whether any charter recipient suffers a custody failure under federal examination, which would test the entire premise. Third, whether Congress codifies or constrains the arrangement, since a change of administration priorities at the OCC could slow approvals without any statute changing.
For now the direction is unambiguous. Crypto’s custody layer is being rebuilt under a single federal supervisor, one application at a time, and the largest consumer payments company in the space just got in line. The state licensing era is not officially over. It is just no longer where the serious money wants to be.