Why Basel’s 1,250% risk weight pointed banks toward custody
The Basel Committee’s June 2021 consultation made holding bitcoin on a bank balance sheet prohibitively expensive in capital. That split the bank crypto question into three businesses with different economics, holding, safeguarding and moving value, and only one was priced out.
Looking Back revisits one week at a time, from January 2020 to today, and asks what it meant for the banks, health systems and public agencies we serve. The series was written in 2026, with the benefit of hindsight, and each article says which week it looks back on.
The week
On June 10, 2021, the Basel Committee on Banking Supervision published a consultative document on the prudential treatment of banks’ crypto-asset exposures. It proposed two groups. Group 1 covered tokenized versions of traditional assets and stablecoins with effective stabilization mechanisms, which would broadly be treated under existing capital rules for the equivalent assets, with some add-ons. Group 2 covered other crypto assets, including bitcoin, which would face a new conservative treatment: a 1,250% risk weight, which in effect requires a bank to hold capital equal to the full value of the exposure. The consultation came amid strong institutional interest in crypto assets, and in the same week El Salvador’s legislature voted to make bitcoin legal tender.
A 1,250% risk weight is a regulator’s way of saying a bank may hold an asset only if it funds the position entirely with capital. That makes a balance sheet position in bitcoin unattractive for any bank that needs its capital to earn a return. The consultation did not ban crypto activity. By pricing one activity out, it showed that banks interested in crypto assets were choosing among three separate businesses, each with its own economics, risks and supervisory concerns: holding crypto assets as principal, safeguarding them for clients, and moving value through tokens and stablecoins.
Holding: priced out by design
The first business, principal exposure to unbacked crypto assets, was the one the proposal targeted most directly. A volatile asset backed fully by capital produces a very low return on equity. The proposal also limited recognition of hedges and raised operational risk questions. For almost every bank and credit union, the arithmetic settled it. Holding was not a business.
That mattered because much of the 2021 pressure on bank leaders, from boards, clients and the press, was framed as holding: why not own bitcoin, or offer exposure to it from the balance sheet? The proposal supplied a clear, external answer. It also exposed the distance between the business that attracted headlines and the businesses that might actually pay.
One nuance remained. Offering clients exposure through regulated funds, where the bank acts as broker or distributor, is a different activity from holding as principal. That is closer to the safeguarding and brokerage business, with conduct and suitability obligations in place of capital ones.
Safeguarding: an operational business with modest capital
The second business was custody. A bank safeguarding crypto assets for clients takes little price exposure but substantial operational risk: generating and protecting private keys, segregating client assets, reconciling on-chain and internal records, and answering for loss or theft. In the United States, the OCC had confirmed in 2020 that national banks could provide crypto custody services, and several large custodians were building offerings.
Custody is an operations and technology business. Its economics depend on scale, automation and the cost of security controls such as hardware security modules, multi-party approval of transfers, and insurance. Most institutions faced a build, buy or partner choice. Building suits only the largest custodians. Buying technology from a specialist still leaves the bank operating keys. Partnering with a sub-custodian outsources keys but concentrates third-party risk. Each route needed due diligence on the provider’s controls, financial strength and handling of client assets in insolvency.
For community banks and credit unions, the realistic options were narrower still. They could partner with a specialist so customers or members could buy and hold crypto assets through the institution’s digital channels, or decline and explain why. A partnership meant relying on a third party for safekeeping and anti-money laundering compliance, with reputational exposure if the partner failed. Declining meant watching customers move funds to platforms outside the regulated banking system. Framing the decision as safeguarding through a partner made the due diligence questions concrete.
Moving: tokens and stablecoins
The third business interested regulators most and was least developed. Group 1 treatment for tokenized traditional assets and qualifying stablecoins signaled that supervisors saw potential in blockchain-based instruments for payments and settlement, provided the instruments were well backed and the technology sound. For banks, that opened tokenized deposits, participation in stablecoin arrangements, and settlement of traditional assets on distributed ledgers.
The economics are those of payments infrastructure: transaction volumes, network effects and operating costs. They build slowly and require cooperation across institutions. In 2021 the business was largely experimental. It was also where the proposed capital treatment was least punitive and where incumbent banks held real advantages, including regulated status, deposit funding and existing client relationships.
Group 1 status was not automatic. The consultation set classification conditions: an effective stabilization mechanism, legally enforceable rights and obligations, a network designed to manage material risks such as settlement finality, and regulated, supervised entities performing redemption and settlement. For a bank, those conditions read like a due diligence checklist. Any stablecoin or token arrangement it joined would need evidence on each one, and failure on any condition would drop the exposure into the punitive group. That made legal and operational review of the arrangement, more than the technology, the gating work.
The practical response was to stop treating crypto as one decision. Holding could be ruled out quickly on capital grounds. Safeguarding needed an honest build, buy or partner analysis with operating cost estimates. Moving needed a watching brief and, for larger institutions, careful pilots. Each required different expertise, vendors and conversations with supervisors. That last point soon became formal. From late 2021, the OCC, and then the FDIC and Federal Reserve in 2022, told the banks they supervise to notify them before engaging in crypto activities. A bank that had separated the three businesses could say clearly which one it was proposing.
With hindsight
From 2026, the three-way split has held up, though the details moved. The Basel Committee finalized its standard in December 2022, after the collapse of several crypto firms, keeping the conservative treatment for unbacked assets and adding exposure limits. Implementation was deferred to January 2026, major jurisdictions including the United States and United Kingdom were slow to adopt it, and the committee has since been running an expedited review of parts of the standard. In the United States, the SEC’s 2022 staff accounting guidance on custodied crypto assets made bank custody expensive until it was rescinded in January 2025, and banking agencies withdrew earlier restrictive statements that spring. The GENIUS Act, signed in July 2025, created a federal framework for payment stablecoins and revived bank interest in moving value. Holding remains a niche. Custody and tokenized payments are where banks have focused.