Cryptocurrency differs from government-issued currency in four ways that matter to anyone actually using it: who controls the supply, whether the law stands behind it, how the IRS taxes each transaction, and how far the value can move in a day. The U.S. dollar is backed by federal law and managed by a central bank. Bitcoin and similar digital assets are governed by software running on a global network of computers. Those structural differences drive every practical consequence below.
Who Controls the Supply
The Federal Reserve decides how many dollars exist. Its Federal Open Market Committee sets monetary policy to pursue maximum employment and price stability, and it can order physical bills printed or create new reserves electronically.1Federal Reserve Board. The Fed Explained – Who We Are There is no hard ceiling on the number of dollars that can ultimately be created. The constraint is policy judgment.
Cryptocurrency flips that model. No central authority decides how much Bitcoin exists or what interest rate to charge. A global network of computers runs the same open-source software, and every participant follows the same rules baked into the code. Changes require broad consensus; if a majority of the network doesn’t support a proposal, nothing happens. Bitcoin’s total supply is capped at 21 million coins, a limit enforced by every node on the network. New coins enter circulation through mining, and the issuance rate is cut in half roughly every four years. The April 2024 halving reduced the reward from 6.25 to 3.125 Bitcoin per block, with the next projected for around April 2028. The schedule is public and practically immutable.
Ethereum uses a different design. Rather than a hard cap, it burns a portion of every transaction fee, which can offset or exceed the new coins created through staking rewards. When network activity is high, supply can actually shrink. When activity drops, it grows modestly. Either way, the rules are transparent and visible to anyone with an internet connection.
The difference matters most in a crisis. A central bank can flood the economy with new money in a matter of days, as the Fed did during 2008 and 2020. That flexibility can stabilize markets, but it also means the purchasing power of every dollar you hold depends on decisions made by a small group of officials. Cryptocurrency removes that lever entirely.
Whether Anyone Has to Accept It
Under federal law, U.S. coins and currency are legal tender for all debts, public charges, taxes, and dues.2Office of the Law Revision Counsel. 31 USC 5103 – Legal Tender That phrase is widely misunderstood. Legal tender means that if you owe someone a debt, they cannot refuse your dollars in payment. It does not mean every store has to take cash. The Federal Reserve states plainly that no federal statute requires a private business to accept currency or coins as payment for goods and services.3Federal Reserve Board. Is It Legal for a Business in the United States to Refuse Cash as a Form of Payment
Cryptocurrency has no legal tender status in the United States. No federal law requires any person or business to accept Bitcoin for anything. Its value comes from market demand and the perceived reliability of the underlying technology. When you send someone cryptocurrency as payment, both sides are doing so voluntarily. That works across borders without currency conversion, but it also means no government stands behind the asset if demand evaporates.
How Much the Value Moves
The whole point of the Fed’s monetary policy is price stability. Inflation erodes the dollar’s purchasing power gradually, but you don’t wake up to find your checking balance worth 15% less than yesterday.
Cryptocurrency has no such stabilizer. Research comparing Bitcoin to major fiat exchange rates found Bitcoin roughly ten times more volatile than traditional currency pairs, and about five times more volatile than U.S. stocks. A large share of crypto price movement is driven by speculation and sentiment rather than changes in economic fundamentals. A 30% swing in a week is unremarkable in Bitcoin’s history. It would be a national emergency for the dollar.
How Transactions Settle and Who Holds the Risk
When you send money through a bank, the bank updates its private internal ledger and routes the payment through intermediary networks. You trust the bank to keep accurate records, process the transfer correctly, and safeguard your account. Domestic wires typically settle in one business day. International wires can take several days and involve correspondent banks in multiple countries, each adding fees.
Cryptocurrency replaces that chain of intermediaries with a public ledger called a blockchain. Every computer in the network holds a copy, and transactions are verified through mathematical proofs rather than a bank employee’s approval. For Bitcoin, the standard confirmation threshold is six blocks, which takes about an hour on average. Some newer networks settle in seconds. Fees fluctuate with network congestion. Bitcoin fees depend on transaction size and demand for block space; Ethereum uses a formula that adjusts a base fee up or down with network activity, with an optional tip to prioritize a transaction.
Holding cryptocurrency also means managing your own security. You control your assets through a private key stored in a digital wallet. Anyone who has the key can move the funds. There is no bank to call if you lose it, and no fraud department to reverse an unauthorized transfer. Self-custody puts you in full control, and it puts the entire burden of security on you.
Taxes: Every Crypto Transaction Is a Taxable Event
This is where people get into the most trouble. The IRS treats cryptocurrency as property, not currency.4Internal Revenue Service. Digital Assets Every time you sell, trade, or spend crypto, you have potentially triggered a capital gain or loss measured by the difference between what you paid for the asset and what it was worth when you disposed of it.5Internal Revenue Service. Notice 2014-21 Buying a coffee with Bitcoin is, for tax purposes, a sale of property. You owe tax on any appreciation since you acquired the coin.
Government-issued currency doesn’t work that way. Spending a dollar doesn’t generate a capital gain. You don’t track the “cost basis” of the twenty in your wallet. That difference alone makes crypto meaningfully harder to use as an everyday payment method, because every transaction creates a recordkeeping obligation.
Starting in 2026, the reporting infrastructure tightens. Crypto brokers must file Form 1099-DA for every sale they process, reporting gross proceeds to both the IRS and the customer. For digital assets acquired after 2025, brokers must also report cost basis, the same way stock brokerages report your stock sales today. Assets acquired before 2026 are treated as noncovered securities, meaning basis reporting is optional for the broker but you still owe the tax.6Internal Revenue Service. 2026 Instructions for Form 1099-DA If you’ve been trading without tracking cost basis, reconstruct those records now.
Insurance and Fraud Protection
When you deposit dollars at a bank, the Federal Deposit Insurance Corporation guarantees up to $250,000 per depositor per institution if the bank fails. That protection does not extend to cryptocurrency. The FDIC has stated explicitly that it does not insure crypto assets and does not protect against the insolvency of crypto companies, exchanges, brokers, or wallet providers.7Federal Deposit Insurance Corporation. Fact Sheet – What the Public Needs to Know About FDIC Deposit Insurance and Crypto Companies
The Securities Investor Protection Corporation, which covers securities and cash up to $500,000 when a brokerage fails, also excludes most digital assets. SIPC specifically does not protect digital asset securities that are unregistered investment contracts, even if held at a SIPC-member brokerage firm.8SIPC. What SIPC Protects
Unauthorized-transaction protections are similarly absent. If someone makes a fraudulent charge on your debit card, the Electronic Fund Transfer Act limits your liability and requires your bank to investigate. No equivalent federal protection applies to a stolen cryptocurrency transfer. Once crypto leaves your wallet, the transaction is final. There is no chargeback mechanism, no dispute process, and no insurance fund. The collapse of several major crypto exchanges in recent years showed exactly what this gap looks like in practice. Customers lost billions with no FDIC-style backstop to make them whole.
Identity Rules Where the Two Overlap
Banks are required to verify customer identity under the Bank Secrecy Act. Federal regulations require national banks to run a customer identification program as part of BSA compliance.9eCFR. 12 CFR 21.21 – Procedures for Monitoring Bank Secrecy Act Compliance In practice, that means providing a government-issued ID, a Social Security number, and proof of address before opening an account. Willful violations of BSA requirements carry criminal penalties of up to $250,000 in fines and five years in prison, rising to $500,000 and ten years if the violation is part of a pattern of illegal activity exceeding $100,000 in a 12-month period.10Office of the Law Revision Counsel. 31 USC 5322 – Criminal Penalties
Cryptocurrency was originally designed to allow pseudonymous transfers, with no name attached, just a string of characters identifying a wallet. That is still how peer-to-peer transfers work. But regulated crypto exchanges in the United States are classified as money transmitters and must comply with the same BSA framework banks follow, including identity verification. The FinCEN travel rule also requires financial institutions, including money transmitters, to pass along sender and recipient information for transfers of $3,000 or more.11FinCEN. FinCEN Advisory Issue 7 – Funds Travel Regulations The underlying technology is permissionless. The on-ramps and off-ramps, where you convert between dollars and crypto, carry the same compliance obligations as traditional finance.
Where the Two Are Converging
Stablecoins
Stablecoins are digital assets designed to hold a fixed value against a government currency, typically one coin equal to one dollar. They borrow the price stability of fiat money while running on blockchain infrastructure. Regulators have focused on what actually backs them. Under a proposed rule from the Office of the Comptroller of the Currency implementing the GENIUS Act, permitted stablecoin issuers would be required to maintain reserve assets on at least a one-to-one basis with their outstanding coins. Those reserves must consist of low-risk assets, meaning U.S. currency, demand deposits at insured banks, or Treasury securities with a remaining maturity of 93 days or less, and must be kept segregated from the issuer’s other assets.12Office of the Comptroller of the Currency. Proposed Rulemaking – Implementing the GENIUS Act If finalized, these rules would bring stablecoin reserves closer to the standards applied to traditional money market funds.
A Digital Dollar
A central bank digital currency would be a digital form of the dollar issued directly by the Federal Reserve. As of February 2026, the Fed has made no decision on whether to pursue or implement a CBDC, though it has been conducting technological research and experimentation to assess whether a digital dollar could improve the existing payments system.13Federal Reserve Board. Central Bank Digital Currency (CBDC) If implemented, a CBDC would carry no credit or liquidity risk because it would be a direct liability of the central bank, unlike both cryptocurrency and bank deposits. For now, physical cash is the only form of central bank money available to the general public.