A blockchain payment starts when a wallet signs an instruction to transfer value. Network nodes check and relay it; a miner or validator includes it in a block, updating the shared ledger. Fees help pay for network resources, and settlement confidence depends on the network’s confirmation or finality rules—not just on when a wallet displays a notification.
What happens when you make a blockchain payment?
- The wallet prepares and signs an instruction. You choose a recipient and amount. The wallet uses a private key to authorize a transaction. A signature proves the instruction was authorized by someone with control of that key; it does not mean the transaction has reached the network or been completed. Bitcoin.org describes a Bitcoin transaction as a transfer between wallets recorded on the blockchain: How does Bitcoin work?
- The transaction is broadcast and checked. The signed transaction is sent to network nodes, which validate it according to that blockchain’s rules and relay it. A transaction hash can help you look up its status, but broadcasting alone is not confirmation. Ethereum.org explains that a transaction is a signed request to update network state and that nodes and validators process it: Ethereum transactions.
- A block includes the transaction. On Bitcoin, miners compete under proof of work to add blocks. On Ethereum, validators propose and attest to blocks under proof of stake. Inclusion changes the network’s shared record, but how much confidence to place in that change depends on the chain’s settlement model.
- The recipient decides when to accept it as settled. A wallet may show an incoming payment before it has the confirmations or finality a recipient requires. A person accepting a small payment may tolerate more risk than a merchant shipping a costly item. Inclusion, confirmation, and finality are related but not interchangeable.
What does a crypto wallet actually hold?
A wallet is an interface and key manager, not necessarily a container holding cryptocurrency. The assets and transaction history are recorded on the network’s ledger; the wallet manages the credentials used to authorize transactions. Ethereum.org defines a wallet as “an interface or application that lets you interact with your Ethereum account, either an externally-owned account or a contract account.” Its private key gives control over the associated account and funds. See Ethereum wallets.
This distinction matters for recovery and custody. If you control the private key, you control the ability to authorize transactions for the associated funds. If a service holds the keys for you, that service has a role in access and recovery. A hardware wallet is one way to help protect keys, but it is not required to send or receive a blockchain payment.
Why Bitcoin and Ethereum account for payments differently
Bitcoin: unspent transaction outputs
Bitcoin uses a model called UTXO, short for unspent transaction outputs. A transaction spends one or more outputs from earlier transactions and creates new outputs, typically for the recipient and any change returned to the sender. A wallet’s displayed balance is an aggregate view of the outputs it can spend, rather than one account balance stored as a single number. The number of inputs and the transaction’s construction can affect how much data it takes to relay and include. See Bitcoin’s transaction developer guide.
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Ethereum: account-based state
Ethereum uses accounts and account-based state. A transaction from an account can transfer ETH or request execution of a smart contract, which may update network state. A simple transfer and a contract interaction can therefore require different amounts of computation. See Ethereum transactions.
Why blockchain transactions have fees
Fees are specific to a network and its current demand for block space or computation. They are not generally a fixed percentage of the amount sent, and a higher fee can improve the chance of inclusion without guaranteeing a particular confirmation time.
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| Network example | How the fee is determined | What can affect the cost |
|---|---|---|
| Bitcoin | Fees are paid by the sender to incentivize miners. They are related to transaction data size and demand for available block space. | Spending many prior outputs or using a more complex transaction can increase data size. Busy block space can raise the fee needed to attract prompt inclusion. See Bitcoin.org’s fee guidance. |
| Ethereum | Fees are paid in ETH and are based on gas used and the price per unit of gas. Gas measures computation required to execute a transaction. | Contract interactions can require more computation than a simple transfer. Ethereum charges the fee whether a transaction succeeds or fails; a low offered fee can delay inclusion, while overbidding can cost more than needed. See Ethereum gas and fees. |
Fees change with network conditions, so a number without a named network and a current timestamp can quickly become misleading. Check the wallet’s fee estimate and the network’s current conditions before sending; also verify that the selected network matches the recipient’s instructions.
When is a blockchain payment final?
Bitcoin confirmations accumulate over time
A Bitcoin transaction receives its first confirmation when included in a block. Later blocks add further confirmations and make a reversal increasingly difficult, but this is probabilistic rather than a guarantee tied to a fixed clock. Bitcoin.org gives an average block interval of about 10 minutes, while noting that blocks can arrive sooner or later; it is not a promised confirmation time. A recipient sets an appropriate confirmation threshold based on the value and risk of the payment. See Bitcoin.org’s confirmation guidance.
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Bitcoin.org says a confirmed Bitcoin transaction cannot be reversed by the sender; returning funds requires the recipient to send them back. That describes the Bitcoin transaction system, not a custodial service, payment processor, or every blockchain arrangement.
Ethereum uses protocol-defined finality
Ethereum proof of stake uses checkpoint votes to finalize blocks. Ethereum.org explains that at least two-thirds of staked ETH must support checkpoint links for finality. This is a protocol rule for Ethereum, not a general property of all blockchains. A transaction’s appearance in a wallet or block should not be confused with the chain reaching that finality state. See Ethereum proof of stake.
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Can a blockchain payment happen off the base chain?
Some payment layers move transactions off-chain and later rely on the underlying blockchain. Bitcoin’s Lightning Network uses channels to route payments; channels open and close on Bitcoin, while payments within them are handled off-chain. This can suit small, frequent payments, but it is a Bitcoin-specific example and should not be assumed to describe other networks. See Bitcoin.org’s Lightning overview.
What merchants should check before marking an order paid
A merchant’s workflow involves more than spotting a transaction. The business needs to match the correct payment request to an order, detect the transaction, decide how many confirmations or what finality state the order requires, and reconcile the payment. The threshold should reflect the value of the goods and the risk of releasing them before settlement confidence is sufficient.
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The Bitcoin Payment Protocol describes detecting a payment and treating it as final after sufficient confirmations: BIP 70: Payment Protocol. Payment processors may also offer conversion to local currency, but availability and capabilities depend on provider and market; check those details directly rather than assuming a processor supports a particular payout.
Quick Recap
How to compare blockchain payment options
- Custody: Who controls the signing keys, and what recovery options exist if access is lost?
- Ledger model: Does the network account for spendable outputs, as Bitcoin does, or use account-based state, as Ethereum does?
- Fee basis: Are costs driven by transaction data and block-space demand, computational gas, or another network-specific mechanism?
- Settlement: Does confidence build through additional confirmations, or does the protocol define a finality state?
- Payment layer: Does the payment occur directly on the base chain or through a secondary layer such as Lightning?
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