Cryptocurrency works through a network protocol that records digital value and checks transfers. A user’s wallet signs a transaction with cryptographic keys; network participants verify it under the protocol’s rules and update the shared record. Bitcoin is one example—not a template for every cryptocurrency.
What a cryptocurrency network records
A cryptocurrency does not exist as a physical coin inside a wallet. The network keeps records of transactions, and those records determine which funds can be spent. In Bitcoin, confirmed transactions are recorded on a shared public ledger called the blockchain. A wallet reads the ledger to calculate funds associated with the keys it manages.
The protocol defines how transactions are authorized and what counts as a valid update to the record. Different cryptocurrencies can use different protocols and agreement mechanisms, so Bitcoin’s details should not be assumed to apply to every network.
How a Bitcoin transaction moves through the network
- The wallet prepares a transaction. The sender specifies a Bitcoin address to pay and an amount.
- The wallet authorizes it. It uses the relevant private key to create a digital signature. The signature demonstrates authorization and helps prevent the transaction from being altered afterward.
- The transaction is broadcast. It is sent to the Bitcoin network, where participants check it against protocol rules, including whether the sender is authorized to spend the funds.
- A miner includes it in a block. Bitcoin miners select pending transactions and add them to a proposed block that must satisfy Bitcoin’s rules.
- The network verifies the block. A valid block is added to the shared ledger. Later blocks build on that record, adding confirmations and making reversal increasingly difficult.
Bitcoin.org’s explanation of Bitcoin describes this ledger, transaction signatures, broadcast and mining process. Mining is Bitcoin’s way of confirming transactions and helping participants agree on the ledger’s state; it is not a universal description of how every cryptocurrency reaches agreement.
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What a crypto wallet stores—and who controls it
A wallet is software or a service that manages the keys used to receive and authorize transfers. The asset itself is recorded on its network; the wallet does not hold a physical coin. The key distinction is who controls the keys and who is responsible for recovery.
| Approach | Who controls the keys? | Who secures recovery? | Main dependency or exposure |
|---|---|---|---|
| Self-custody | The user | The user must protect backup or recovery information | Loss of access or recovery material can mean permanent loss of funds; the user is responsible for key security. |
| Custodial wallet or exchange account | The service provider controls or manages the keys | Access and recovery depend on the provider’s process | Withdrawals and access depend on the provider’s security, solvency and policies. |
A hardware wallet is one possible tool for managing keys in self-custody, not a guarantee against loss, phishing or user error. Its usefulness depends on supported networks and a recovery process the owner can manage safely.
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How long does a Bitcoin transaction take?
There is no guaranteed Bitcoin confirmation time. Bitcoin.org says blocks are discovered approximately every 10 minutes on average, but block discovery is probabilistic: an individual block may arrive sooner or later, with no guaranteed minimum or maximum delay. Transaction fees and network conditions can also affect how quickly a pending transaction is confirmed. A displayed or quoted estimate is therefore not a promise that the payment will settle by a particular minute.
Confirmation means a transaction has been included in a block. Additional confirmations mean more blocks have been added after it; they increase confidence that the recorded transaction will remain in the ledger, rather than making it instantly or absolutely irreversible. The level of confirmation a recipient considers sufficient can depend on the circumstances.
Are Bitcoin transactions anonymous?
No. Bitcoin transactions are public and permanent on the network. An observer can inspect activity associated with an address, but the address does not necessarily reveal the person behind it. If other information connects an address to a person, the associated activity may be linked to them. “Pseudonymous” is more accurate than “anonymous.” Bitcoin.org recommends privacy practices, including using addresses only once.
Can a Bitcoin transaction be reversed?
The sender has no undo button for a Bitcoin payment. A recipient can choose to send a refund, but the sender cannot reverse the original transfer. This makes checking the recipient address and amount before authorizing a payment important: a mistaken or fraudulent transfer may not be recoverable.
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What risks come with using cryptocurrency?
- Lost keys or backups: In self-custody, permanently losing access to the wallet can mean permanent loss of funds.
- Theft and scams: The CFTC warns that virtual currencies are targeted by hackers and criminals. Stolen funds may come with no assurance of recourse.
- Platform failure or restrictions: A custodian’s security, solvency and withdrawal policies affect access to assets held through its service. The CFTC also warns that some cash-market platforms may be unregulated or unsupervised.
- Price volatility: The market value of Bitcoin can change substantially. Bitcoin.org cautions users not to put in money they cannot afford to lose.
The CFTC advises checking the legitimacy of platforms and wallets and avoiding products or strategies you do not understand. These are general educational cautions, not individualized financial advice.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Does a working payment network make a cryptocurrency a good investment?
No. A network’s ability to record and transfer value does not establish that its token will rise in price, retain value or suit a particular person’s financial needs. The technical question—how the network authorizes and records transfers—is separate from the investment question of what an asset may be worth and what risks an owner can bear.
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What the 2026 U.S. regulatory interpretation does—and does not—say
In the United States, the SEC and CFTC published a joint interpretation of crypto assets and transactions that took effect March 23, 2026. It discusses categories including digital commodities, digital collectibles, digital tools, stablecoins and digital securities, as well as activities such as mining, staking, wrapping and airdrops. Its scope is U.S. federal securities-law interpretation; it is not a universal legal classification for every token or a substitute for local legal analysis. The interpretation also says it does not supersede or replace the Howey test. A category label alone should not be read as a blanket conclusion about every asset or transaction.
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