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Cryptocurrency works through a network and protocol that record digital value and authorize transfers using cryptographic keys and network agreement. With Bitcoin, a shared public ledger records confirmed transactions; a wallet uses keys to authorize a payment, and miners help add valid transactions to that ledger. The wallet does not hold a physical coin, and Bitcoin’s particular rules should not be assumed to apply to every cryptocurrency.
What a cryptocurrency network records
A cryptocurrency is digital value tracked under the rules of a network. In Bitcoin, participants share a ledger of confirmed transactions, commonly called the blockchain. The ledger lets the network determine which bitcoin outputs are available to spend and helps participants agree on the current state of transactions.
A wallet uses that ledger to show an estimated or spendable balance. The balance is not a separate object stored inside the wallet: the relevant records are on the Bitcoin network, while the wallet manages the keys needed to receive and authorize transfers. Bitcoin.org’s “How does Bitcoin work?” explains this ledger-and-key model.
Bitcoin is one implementation, not a template for every cryptocurrency. Networks can have different protocols, agreement mechanisms, transaction rules, fee systems, privacy properties and reversal policies. The explanation below describes Bitcoin where it names Bitcoin; it is not a technical comparison of all networks.
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How a Bitcoin transaction moves through the network
- The wallet prepares a transaction. When a user sends bitcoin, the wallet selects funds available under the ledger and specifies the destination and amount.
- The wallet signs it. A private key creates a digital signature that proves the transaction was authorized by someone controlling the relevant funds. The signature also helps protect the transaction from being altered after signing.
- The transaction is broadcast. It is sent to the Bitcoin network, where participating nodes check whether it follows the protocol’s rules, including whether the funds can be spent.
- Miners include transactions in a block. Bitcoin miners compete to add a block that meets the protocol’s requirements. Other network participants verify the proposed block against the rules.
- Further blocks add confirmations. As subsequent blocks build on the one containing the transaction, reversing it becomes harder. A confirmation raises confidence; it is not an instant, absolute guarantee of finality.
Mining is Bitcoin’s method for proposing blocks and helping the network agree on ledger history. It should not be described as the universal way cryptocurrencies process transactions: other networks can use different consensus designs.
What a crypto wallet actually stores
A wallet is software or a service that manages the keys used to receive and authorize transfers. A self-custody wallet also typically relies on recovery information—such as a recovery phrase or backup—that can restore access if the original device is lost. That recovery information is effectively a route to control the funds, so anyone who obtains it may be able to spend them.
People can instead keep assets with an exchange or another custodian. In that arrangement, the provider controls or administers the relevant keys and the customer relies on the provider to honor withdrawals. The distinction is not simply “online” versus “offline”; it is who controls the keys and who bears the recovery and service-provider risks.
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| Approach | Who controls the keys? | Who is responsible for recovery? | Main dependency |
|---|---|---|---|
| Self-custody | The user | The user must protect recovery material and keep a usable backup. | Correct handling of keys, backups and wallet software. |
| Custodial service, such as an exchange account | The service provider controls or administers access; the exact arrangement depends on the provider. | The provider manages account recovery, subject to its processes and policies. | The provider’s security, solvency, account controls and withdrawal policies. |
Self-custody avoids dependence on a custodian for routine access, but it shifts responsibility to the user. Bitcoin.org warns that permanently losing access to a self-custodied wallet can mean permanently losing the funds. A hardware wallet is one possible way to manage keys, not a guarantee against loss, phishing, bad backups or user error; recovery still needs careful handling.
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How long a Bitcoin transaction takes
Bitcoin.org says a block is discovered approximately every 10 minutes on average. That is an average block interval, not a promised payment time: block discovery is probabilistic, with no guaranteed minimum or maximum delay. A transaction may wait before being included, and fees and network conditions can affect how quickly it receives confirmation.
How many confirmations a recipient requires depends on the payment’s circumstances and the recipient’s risk tolerance. Bitcoin.org gives guidance that varies by situation, rather than one rule that makes every payment safe after a fixed number of blocks. A recipient may choose to wait for additional confirmations when the amount or consequences of a reversal are significant.
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- Tap once to manage your entire crypto wallet across 90 blockchains - no USB cables or Bluetooth, no batteries, no setup. Access 14,100+ coins & tokens, DeFi, NFTs, and staking instantly from your phone
- Smart backup: Use your second Tangem Wallet as your Backup keys with end‑to‑end encryption; no more papers, pictures. If one card is lost, the remaining can still restore full access, with an optional seed phrase available for advanced users.
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Are Bitcoin transactions anonymous or reversible?
Privacy: public addresses, not automatic anonymity
Bitcoin transaction history is public and permanent. Someone can inspect activity associated with an address, but the address does not by itself necessarily identify the person using it. If other information connects an address to a person, transactions linked to that address may become attributable. “Pseudonymous” is therefore more accurate than “anonymous.” Bitcoin.org recommends privacy practices, including using addresses only once; this does not make activity on a public ledger disappear.
Reversals: no sender-side undo button
A Bitcoin payment cannot be reversed by the sender through the network after it has been sent. The recipient can choose to send a refund, but that is a new transaction, not an undo of the original one. Confirmations make a transaction harder to reverse as time passes, but they do not turn it into a sender-controlled chargeback. This description is specific to Bitcoin; other networks and services may have different rules.
Risks beyond how the technology works
Operating as designed does not make a cryptocurrency safe from every kind of loss. Technical control, platform reliability and market value are separate questions. The CFTC’s advisory on virtual-currency trading warns that criminals target virtual currencies, stolen funds may come with no assurance of recourse, and some cash-market platforms may be unregulated or unsupervised.
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- Lost keys or recovery information: With self-custody, a damaged device may be replaceable, but missing recovery material can make funds inaccessible.
- Theft and scams: Someone tricked into disclosing keys or sending funds to a fraudster may have little practical recourse. Verify platforms and wallets before trusting them with access or money.
- Custodian or platform failure: A service can impose withdrawal limits, suspend withdrawals or fail. A balance shown in an account is not the same as personally controlling the keys.
- Price volatility: A token’s market value can change sharply. A network’s ability to transfer value does not guarantee that the asset will retain value or be a sound investment.
Bitcoin.org cautions users not to put into Bitcoin money they cannot afford to lose. The CFTC likewise advises checking that platforms and wallets are legitimate and avoiding products or strategies that are not understood. These are general educational cautions, not individualized financial advice.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Buying cryptocurrency is separate from understanding it
Knowing how a transaction works does not answer whether to buy a cryptocurrency. Before using a service, understand whether it is custodial or self-custody, what asset and network a transfer uses, what fees apply, how withdrawals work, and what happens if access is lost. Sending an asset on the wrong network or to an incompatible destination can create a loss that is difficult or impossible to recover.
Do not treat the network’s usefulness as proof of an investment’s value, and do not assume a quoted account balance can be withdrawn without conditions. If you are considering a purchase, account for the possibility of losing the amount invested and check the rules that apply where you live.
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What the 2026 U.S. crypto interpretation does—and does not—say
For U.S. readers, 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. It is an interpretation concerning U.S. federal securities law, not a universal classification for every token worldwide. The document also says it does not supersede or replace the Howey test.
In the SEC’s March 17, 2026 release, Chairman Paul S. Atkins characterized the interpretation as bringing clarity and said it acknowledges that “most crypto assets are not themselves securities.” That is the chairman’s description of the agency action, not a blanket legal conclusion that any particular asset or transaction is outside securities laws. The interpretation’s scope and the facts of a specific offering or transaction matter; readers should not treat a broad category label as legal advice.
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