USD1 Stablecoin Library

The Encyclopedia of USD1 Stablecoins

Independent, source-first encyclopedia for dollar-pegged stablecoins, organized as focused articles inside one library.

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The term “USD1” on this website is used only in its generic and descriptive sense—namely, any digital token stably redeemable 1 : 1 for U.S. dollars. This site is independent and not affiliated with, endorsed by, or sponsored by any current or future issuers of “USD1”-branded stablecoins.

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USD1 Stablecoin Firm

USD1 Stablecoin Firm is a practical, educational guide for any firm that wants to understand USD1 stablecoins in a generic, descriptive sense. In this article, a stablecoin means a digital token designed to hold a steady value against a reference asset, and USD1 stablecoins means digital tokens designed to be stably redeemable one to one for U.S. dollars. A firm may be a business, a financial institution, a nonprofit, a marketplace operator, or a treasury team that is asking a simple question: when do USD1 stablecoins make sense, and what must be checked before real money moves?[1][2][5]

The careful answer is that USD1 stablecoins can be useful, but only when a firm looks beyond the headline promise of a dollar-like digital instrument. A real decision involves legal rights, reserve assets, redemption mechanics, the blockchain network, the wallets, the service providers, the compliance stack, and the way finance staff will record and reconcile every movement. That is why serious firm adoption is less about hype and more about treasury design, payments design, governance, and control.[1][2][3][6]

This page is educational only. It is not legal, tax, accounting, or investment advice. It is meant to help a firm frame the right questions before using USD1 stablecoins for treasury, settlement, supplier payments, customer payouts, or internal liquidity management.[1][2][11]

  • USD1 stablecoins may offer always-on transfer capability, software-driven workflows, and in some cases faster settlement than ordinary cross-border payment routes, but those benefits still depend on on-ramps and off-ramps, compliance reviews, and the reliability of service providers.[3][6]
  • USD1 stablecoins are not automatically the same thing as cash in a bank account, an insured deposit, or central bank money. The legal claim depends on structure, documentation, and jurisdiction.[4][5][7]
  • A prudent firm usually starts with redemption rights, reserve quality, custody, sanctions and anti-money laundering controls, accounting treatment, and incident response before it starts with marketing or product design.[1][2][11][12]

What a firm needs to know

A firm does not really buy simplicity when it adopts USD1 stablecoins. It buys a stack of dependencies. There is an issuer of USD1 stablecoins, or an intermediary connected to the issuer. There is a redemption process, which is the path back into ordinary money. There are reserve assets, which are the assets meant to support the one-for-one promise. There is custody, which means the safekeeping of the credentials and systems that control transfers. There is the blockchain itself, which is the shared transaction record maintained across many computers. There are also legal terms that decide who may redeem, when redemptions can be paused, what evidence supports the reserves, and what happens if a provider fails.[1][5][6]

For a firm, that means the main question is not whether USD1 stablecoins are innovative. The main question is which business problem they solve better than a bank transfer, a card payout, a money market instrument, or an internal ledger entry. If there is no clear answer on cost, timing, access, or programmability, the project is usually not mature enough. If the answer is only that everyone else seems interested, that is a weak operating rationale and a poor control standard.[1][3][6]

A second point is that not every use case has the same risk profile. Holding a small working balance, which means an amount kept for near-term operations, of USD1 stablecoins for short settlement windows is different from keeping a large treasury allocation in USD1 stablecoins for weeks or months. Sending USD1 stablecoins to a known institutional counterparty, which means the other party in a transaction, on a controlled network is different from making retail payouts to thousands of externally controlled wallets. Using USD1 stablecoins only as a bridge between bank accounts can be operationally simpler than using them inside a broader decentralized finance, or DeFi, environment, which means software-based financial services running on blockchains without the usual institutional middle layers.[1][6][11][12]

A third point is that firms should separate payment convenience from balance-sheet confidence. USD1 stablecoins can move quickly and still be hard to redeem under stress. A wallet can settle on-chain, which means directly on the blockchain, in minutes and still create a problem if internal approvals, sanctions screening, or reconciliation are weak. A public blockchain can be available at all hours and still leave a firm dependent on business-day banking access when it wants to return to bank money. Speed at the blockchain layer is not the same thing as certainty across the whole operating chain.[1][3][5][6]

Why firms care about USD1 stablecoins

There are several reasons firms look at USD1 stablecoins without assuming they are a universal answer. The first is settlement availability, meaning the ability to complete a payment or transfer. Many blockchain networks can process transfers day and night, including weekends and holidays. For firms that operate globally, that can matter when suppliers, trading counterparties, affiliates, or platform users are spread across time zones and ordinary banking windows do not line up. The second is programmability, which means money can interact with software rules, such as automated release after a delivery check, a time-based payout, or an automatic movement of balances between approved accounts triggered by a defined threshold. The third is composability, which means one service can connect with another service on the same network without a separate custom integration for every step.[1][6]

Cross-border payments are another reason. The BIS, which means the Bank for International Settlements, has noted that stablecoin arrangements could help some cross-border payment flows if they are properly designed, properly regulated, and connected to reliable on-ramps and off-ramps. For a firm, an on-ramp or off-ramp means the service that moves value between bank money and USD1 stablecoins. In practice, a firm may care less about USD1 stablecoins themselves than about whether a supplier can receive value in a useful form, at a predictable cost, with clear compliance handling and fast exception management.[3]

Treasury and internal liquidity management can also matter. Federal Reserve research describes stablecoin use cases that include payments and internal transfers across subsidiaries. In plain English, that means a firm may use USD1 stablecoins as a temporary settlement rail to move value between entities or service providers more quickly than ordinary cross-border banking routes allow. That does not remove legal entity accounting, transfer pricing, which means tax rules for dealings between related entities, or regulatory requirements, but it can change the speed and operating shape of the movement.[6]

Digital marketplaces and platform businesses sometimes have a separate reason to explore USD1 stablecoins. If a platform already serves users who keep balances in digital wallets, then using USD1 stablecoins for some settlement or payout paths may reduce reliance on a patchwork of local payout rails. The potential gain is not automatic cost reduction. The gain is usually optionality, meaning the firm may have another route when local rails are slow, fragmented, closed outside business hours, or not well aligned with the platform's user base. A platform still needs a clear policy on accepted wallets, failed transfers, fraud handling, and user disclosures.[1][3][11][12]

A final reason is strategic readiness. Some firms expect more assets, invoices, receivables, and payment processes to become tokenized over time. Tokenization means recording claims or assets in token form on a distributed ledger. Even if a firm is not ready to hold large balances in USD1 stablecoins, learning how USD1 stablecoins settle, how they interact with custodians, and how they appear in reporting can be a way to prepare for a broader digital asset operating environment.[1][4][6]

None of this means a firm should assume a permanent advantage. The BIS and other policy bodies repeatedly stress that stablecoins can create new risks, especially around one-to-one redemption, legal structure, reserve quality, and broader economic spillovers. A firm should therefore see USD1 stablecoins as a tool that may fit a narrow operating job, not as a magic replacement for every payment account, every treasury instrument, or every internal ledger.[2][3][4]

What a firm is really evaluating

When a firm evaluates USD1 stablecoins, it is useful to break the review into clear layers.

1. Legal claim and redemption

The first layer is the legal claim. Who owes what to whom? Can the firm redeem directly with the issuer of USD1 stablecoins, or only through a platform or distributor? Is redemption promised at face value, which means the stated one-to-one redemption amount, and under what conditions? Are there cutoffs, fees, minimum size rules, or jurisdiction limits? Is the firm's claim based on contract language, law, both, or neither? In Europe, MiCA, which means the European Union's Markets in Crypto-Assets Regulation, distinguishes asset-referenced tokens from e-money tokens, and the EBA, which means the European Banking Authority, says in its consumer factsheet that a holder of an e-money token has the right to get money back from the issuer at full-face value in the referenced currency. In the United States, the 2025 federal payment stablecoin law defines payment stablecoins in part through a redemption obligation for a fixed amount of monetary value, while also making clear that such tokens are not themselves national currency or deposits under that law.[7][8][9][10]

2. Reserve assets and reserve reporting

The second layer is reserve support. A firm should want to know what assets back the outstanding USD1 stablecoins, where those assets sit, how quickly they can be liquidated, and how often the issuer publishes reserve information. The old Treasury stablecoin report warned that there were no consistent reserve composition standards across the market at that time, and policy work since then has focused heavily on reserve quality, redemptions, and safety and soundness safeguards. The newer U.S. federal framework requires identifiable reserves on at least a one-to-one basis and limits reserve categories. Even where law is clearer, a firm still needs issuer-specific evidence, not just broad policy language.[5][7]

A careful treasury team also separates reserve reporting from reserve comfort. A report can describe holdings at a point in time and still leave open questions about same-day liquidity, concentration, operational dependence on custodians, and what happens under severe redemptions. In other words, reserve disclosure is necessary, but it is not the whole risk answer. A firm should read any public disclosure with the mindset it would apply to a cash manager, short-term cash fund, or payments provider: what is held, where is it held, who controls it, how often is it tested, and what rights exist if conditions deteriorate?[1][4][5]

3. Network choice and technical path

The third layer is network design. USD1 stablecoins may exist on one blockchain or on several. A public blockchain is open for many participants to use. A permissioned network has controlled access. A firm should ask which network it will actually use, what the transaction fee model is, how congested the network becomes during volatile periods, and whether the firm must use bridges. A bridge is a service or protocol that moves tokens across blockchains. Bridges can add convenience, but they also add technical and operational risk because they create another place where controls can fail.[1][6][11]

Technical design also affects reconciliation. Reconciliation means matching the firm's internal books to external records. A finance team should know how it will match wallet balances, transaction identifiers, bank debits, bank credits, and any provider statements. If the firm cannot explain how a transfer moves from bank account to wallet to counterparty to redemption path and back into the general ledger, which is the main accounting record, it is not ready for scale.[1][6]

4. Access model and custody

The fourth layer is access. Some firms want a direct relationship with the issuer of USD1 stablecoins. Others prefer a regulated intermediary, a qualified custodian, which is a regulated specialist that safekeeps assets for clients, or a payments provider that sits between the firm and the chosen blockchain network. There is no universal best answer. Direct access may improve redemption clarity but can increase operational burden. An intermediary can simplify onboarding and reporting but introduces counterparty dependence. Custody matters because moving USD1 stablecoins ultimately depends on secret credentials, often called private keys, that authorize transfers. Poor key management is not a minor technical issue. It is a direct asset-loss risk.[1][11][14]

5. Compliance and illicit finance controls

The fifth layer is compliance. Know your customer, or KYC, means identity checks to verify who a client is. Anti-money laundering, or AML, means controls designed to identify and reduce illicit finance risk. Sanctions screening means checking whether a person, entity, wallet, or flow is prohibited or restricted. FATF, which means the Financial Action Task Force, emphasizes in its guidance and 2025 targeted update that jurisdictions and private firms must treat virtual asset risks seriously, implement licensing and registration where required, operationalize travel rule obligations, which are rules under which certain sender and recipient information must accompany transfers between regulated providers, and monitor growing illicit finance use of stablecoins. For a firm, that means wallet screening, counterparty review, transaction monitoring, and escalation procedures cannot be added at the end. They need to be designed from the start.[11][12]

6. Governance and incident response

The sixth layer is governance. Who approves wallets? Who can initiate transfers? Who can change whitelists, which are lists of pre-approved destination addresses? Who signs emergency notices? Who decides whether a transfer should be retried, reversed through an operational arrangement, or written off? Governance also includes incident response: what happens if a wallet is compromised, a provider freezes an address, a chain halts, a bridge fails, or the issuer of USD1 stablecoins changes network support? Without written playbooks, even a technically successful stablecoin rollout can fail when the first exception appears.[1][2][11][12]

Common operating models

Most firms do not start with the most complex model. They usually begin with one of three operating patterns.

The first pattern is the narrow settlement model. The firm acquires USD1 stablecoins, uses them for a specific payment or settlement event, and redeems soon after. This keeps holding periods short and reduces balance-sheet exposure to issuer risk, operational drift, and policy surprises. It is often the cleanest starting point for cross-border supplier payments, market settlement, or time-sensitive treasury movements.[1][3][6]

The second pattern is the platform payout model. A marketplace, payroll technology provider, or digital services platform holds and distributes USD1 stablecoins to users who prefer wallet-based receipt. This model can solve availability and access problems, but it creates substantial responsibilities around user disclosures, wallet validation, fraud handling, transaction monitoring, and customer support. The firm should be realistic about exception rates. The harder part is often not sending USD1 stablecoins. The harder part is everything that happens when the user typed the wrong address, fails screening, or wants funds returned through a different route.[1][11][12]

The third pattern is the treasury utility model. A larger firm or financial institution uses USD1 stablecoins as one tool in a broader liquidity architecture. It may move balances among affiliates, trading service providers, custodians, exchanges, or settlement agents. This model can produce real operating value, but only if the firm has mature controls for approvals, reconciliation, maximum exposure limits, and legal entity reporting. It is a poor fit for a firm that still lacks basic digital asset policy discipline.[6][14]

What should a firm avoid at the start? Usually, long-term passive holding without a defined treasury policy, unmanaged use across multiple blockchains, ad hoc employee wallet handling, or a plan that assumes stable market conditions. It is better to use USD1 stablecoins for one narrow, documented workflow first, measure where friction still appears, and only then decide whether a broader rollout is justified.[1][2][4]

Risk and controls

Balanced adoption begins with admitting that USD1 stablecoins create a mix of old and new risks. Some are familiar treasury risks. Some are software and network risks. Some sit awkwardly in the middle.

Redemption and liquidity risk

The one-for-one story matters only if the firm can actually convert USD1 stablecoins into U.S. dollars when needed. A prudent firm therefore tests the redemption path before it relies on it. It should understand settlement windows, documentation requirements, bank counterparties, holiday schedules, minimum redemption sizes, and any temporary suspension language. If a firm would face a serious cash shortfall because redemption takes longer than expected, then its working balance in USD1 stablecoins is too large for its cash needs profile.[1][3][5][7]

Counterparty and legal risk

A firm should identify every material counterparty: the issuer of USD1 stablecoins, the distributor, the exchange, the trading venue, the custodian, the wallet provider, and any bank supporting reserve or redemption flows. It should review terms of service, bankruptcy treatment, and dispute provisions. A good rule is to map the entire path from issuance to redemption as if each party could fail on the worst possible day. This sounds conservative because it is conservative, and that is exactly what treasury work is supposed to be.[1][2][5]

Key and wallet risk

Wallet operations deserve the same seriousness as wire initiation authority. A wallet is the software or hardware that stores the credentials needed to control assets on-chain. Firms often reduce this risk with multi-person approval, hardware isolation, device management, and address whitelisting. Segregation of duties, which means splitting initiation, approval, and reconciliation across different people, matters here as much as it does in ordinary cash management. No serious firm should depend on one laptop, one person, or one undocumented recovery phrase.[11][14]

Smart contract, bridge, and network risk

Public blockchains and related software can fail in ways that do not resemble ordinary bank operations. Network congestion can raise transaction costs or delay settlement. A smart contract, which is software on a blockchain that executes preset rules, can contain a flaw. A bridge can be exploited. The software governing USD1 stablecoins can sometimes be upgraded, paused, or restricted according to its design and governance. Firms should therefore avoid unnecessary technical complexity in early deployments. Each extra chain, bridge, wrapper, or automation rule may create another failure point to monitor and explain.[1][11][12]

Compliance and screening risk

A firm using USD1 stablecoins needs a clear compliance perimeter. Which wallets are permitted? Which counterparties are prohibited? Which geographies need extra review? How are suspicious patterns escalated? FATF's recent work makes clear that stablecoins are now deeply relevant to illicit finance controls and that travel rule implementation remains a live supervisory issue. That makes policy, staffing, and vendor design central to any serious rollout.[11][12]

Accounting, tax, and reporting risk

Many firm projects fail because operational teams move faster than accounting teams. That is a mistake. A controller needs to know what the asset is, what rights attach to it, how fair value, which means a market-based current value, or other measurement rules apply, where gains or losses may arise, what disclosures are needed, and how third-party custody is represented. The U.S. reporting environment changed when Staff Accounting Bulletin 122, or SAB 122, rescinded Staff Accounting Bulletin 121, or SAB 121, in 2025, while the Financial Accounting Standards Board, or FASB, has separately provided accounting guidance for certain crypto assets under U.S. GAAP, which means U.S. generally accepted accounting principles. Under IFRS, which means international financial reporting standards used in many jurisdictions, the existing cryptocurrency agenda decision still matters, but it does not automatically answer every question for tokenized claims with contractual redemption rights. Firms need fact-specific analysis, not slogans.[13][14][15]

Concentration and strategic risk

Even when everything appears to work, dependence can build quietly. A firm can become too dependent on one issuer of USD1 stablecoins, one chain, one custodian, or one region's regulatory stance. It can also overestimate the durability of a business case that only exists because of temporary market frictions elsewhere. Maximum exposure limits, backup routes, and periodic business-case reviews are simple disciplines that prevent a pilot from turning into a hidden dependency.[1][2][4]

Regulation, accounting, and reporting

Regulation is no longer a side note. It is part of the product design. In the United States, the federal framework for payment stablecoins changed materially in 2025 with Public Law 119-27, which sets out a legal regime for payment stablecoins, including definitions, reserve standards, and supervisory structure. Among other things, that law requires at least one-to-one identifiable reserves for permitted issuers and states that payment stablecoins under the statute are not national currency, deposits, or securities under the relevant definitions used there. That does not eliminate legal analysis for every firm use case, but it does change the baseline conversation for U.S. market participants.[7]

In the European Union, MiCA established uniform market rules for crypto-assets, including asset-referenced tokens and e-money tokens, with authorization, disclosure, governance, and supervision features. For firms active in Europe, the question is not merely whether they like USD1 stablecoins. The question is whether the relevant product, provider, and activity fit the EU rulebook, whether the provider is authorized where required, and what redemption and conduct protections apply. The EBA and the joint European supervisory factsheet both underline that user protection depends heavily on whether a product is regulated and whether the provider is authorized.[8][9][10]

The global picture remains uneven. FSB, which means the Financial Stability Board, work emphasizes cross-border coordination, activity-based regulation, and readiness by authorities. FATF work emphasizes licensing, registration, travel rule implementation, and illicit finance controls. For firms that operate across several markets, this means the same USD1 stablecoins workflow may be acceptable in one jurisdiction, restricted in another, and subject to a different reporting or consumer-protection expectation elsewhere. A global firm should therefore avoid the assumption that one legal memo solves every country question.[2][11][12][16]

Accounting and reporting should be handled early. Under U.S. GAAP, some crypto assets now have more explicit accounting guidance, but firms still need to determine whether the particular rights attached to USD1 stablecoins place them inside or outside a specific accounting model. Under SEC reporting, meaning reporting overseen by the U.S. Securities and Exchange Commission, custody and safeguarding obligations must be assessed under the post-SAB 122 framework rather than the old SAB 121 approach. Under IFRS, the 2019 agenda decision on cryptocurrency holdings is still relevant, especially because it addresses assets that do not give rise to a contract with another party. That is one reason a firm should not casually assume that every blockchain-based digital asset is accounted for the same way.[13][14][15]

The practical lesson is simple. The finance team, legal team, risk team, operations team, and compliance team should all review the same transaction map. If each group describes the firm's use of USD1 stablecoins differently, the firm is not yet aligned enough to scale.[1][2]

Questions a firm should ask

Before first use, a firm should be able to answer the following questions clearly and in writing.

  1. What exact business problem do USD1 stablecoins solve better than a bank transfer, card payout, or internal ledger?
  2. Who can redeem the USD1 stablecoins that the firm receives or holds?
  3. What reserve assets back the outstanding USD1 stablecoins, and how often are they disclosed?
  4. Which blockchain or blockchains will be used, and are bridges required?
  5. Who holds the private keys, and what approval controls govern transfers?
  6. Which wallets and counterparties are permitted, and how are sanctions and AML checks performed?
  7. How will the firm reconcile wallet activity to bank records and the general ledger?
  8. What is the accounting conclusion under the firm's reporting framework, and who signed off on it?
  9. What is the incident playbook if a transfer fails, a wallet is compromised, or a provider is unavailable?
  10. What is the exit plan if the firm needs to reduce or stop using USD1 stablecoins quickly?[1][2][3][11][12]

A useful test is whether the firm can answer those questions without hand-waving. If the answer relies on vague assumptions such as USD1 stablecoins are always stable, the chain is always up, or the provider will probably help, then the control framework is not mature enough. Firms do not need certainty about every future event, but they do need explicit ownership, written policies, and a realistic sense of what can go wrong.[1][2][4]

Frequently asked questions

Are USD1 stablecoins the same as cash?

Not in a legal or operational sense. USD1 stablecoins may be designed to track and redeem one to one for U.S. dollars, but that does not automatically make them the same as central bank money, a commercial bank deposit, or cash for every legal and accounting purpose. The answer depends on the legal structure, the issuer terms, the reserve design, and the applicable jurisdiction.[4][5][7]

Are USD1 stablecoins always cheaper than international wires?

No. They can be cheaper in some paths, especially when a firm already has counterparties that already use blockchain wallets and efficient conversion routes. But the full cost includes on-ramp fees, off-ramp fees, compliance checks, custody, failed payment handling, tax and accounting work, and sometimes higher operating complexity. A cheap on-chain transfer is not the same as a cheap end-to-end payment.[1][3][6]

Can a firm keep all of its short-term liquidity in USD1 stablecoins?

That would usually be an aggressive policy choice, not a neutral one. Even if the firm likes the issuer, the reserves, and the technology, it still faces too much exposure to one issuer, operational risk, policy change risk, and redemption dependence. Many firms that use USD1 stablecoins prudently will limit them to clearly defined workflows, maximum exposure limits, and short holding windows unless they have a very strong reason to do more.[1][2][4]

Do USD1 stablecoins remove foreign exchange risk?

They remove only one specific kind of foreign exchange problem, and only in some workflows. If a firm owes U.S. dollars and can settle in USD1 stablecoins, it may avoid converting into another currency for that leg of the payment. But the firm still faces country rules, local banking constraints, local tax handling, and sometimes the economic effect of holding a dollar-linked instrument in a non-dollar operating environment. FSB work on emerging markets specifically warns about broader economic effects and currency substitution pressures from foreign-currency-pegged stablecoins.[3][16]

What reserve evidence should a firm look for?

At a minimum, the firm should want clear public information on reserve composition, custody, redemption mechanics, and the reporting cadence. It should also want to know whether the evidence is point-in-time or period-based, who prepared it, what standard was used, and what important questions remain outside the report. Firms that are already used to reviewing money market disclosures, bank due diligence packs, or payment provider control reports should bring the same discipline here.[1][5][7]

Can a firm rely on a single provider for everything?

It can, but it should do so knowingly and with limits. One provider can simplify operations, yet it also concentrates redemption, custody, reporting, compliance tooling, and technical dependency in one place. A mature firm usually prefers a documented fallback route, periodic provider review, and a clear exit plan rather than pure convenience.[1][2][11]

Are public blockchains a problem for enterprise use?

Not automatically. Public blockchains can provide broad access, transparency, and constant availability. The real question is whether the firm's control framework is strong enough for the chosen network. Some firms may prefer a public chain with strict internal wallet policy. Others may prefer a permissioned environment with a smaller participant set. The right answer depends on the use case, the counterparties, and the firm's own risk appetite.[1][3][6]

In the end, the strongest firm use case for USD1 stablecoins is usually narrow, measurable, and boring in the best possible way. It saves time in a known settlement process. It gives a treasury team another usable rail. It supports a customer payout path that ordinary banks do poorly. It is governed by written policy, not excitement. That is often the difference between a durable business tool and a costly experiment.[1][2][3]

Sources

  1. Understanding Stablecoins; IMF Departmental Paper No. 25/09; December 2025
  2. High-level Recommendations for the Regulation, Supervision and Oversight of Global Stablecoin Arrangements: Final report
  3. Considerations for the use of stablecoin arrangements in cross-border payments
  4. III. The next-generation monetary and financial system
  5. Report on Stablecoins
  6. Stablecoins: Growth Potential and Impact on Banking
  7. Guiding and Establishing National Innovation for U.S. Stablecoins Act, Public Law 119-27
  8. Markets in Crypto-Assets Regulation (MiCA)
  9. Asset-referenced and e-money tokens (MiCA)
  10. Crypto-assets explained: What MiCA means for you as a consumer
  11. Updated Guidance for a Risk-Based Approach for Virtual Assets and Virtual Asset Service Providers
  12. Targeted Update on Implementation of the FATF Standards on Virtual Assets and Virtual Asset Service Providers
  13. Accounting for and Disclosure of Crypto Assets
  14. Staff Accounting Bulletin No. 122
  15. Holdings of cryptocurrencies
  16. Cross-border Regulatory and Supervisory Issues of Global Stablecoin Arrangements in EMDEs