Blockchain transactions do not enter a single global queue. Each node keeps a local pool of pending transactions, and a block producer or sequencer chooses a valid subset, arranges it, and publishes the block. Limited block capacity creates competition for inclusion. Fees can make a transaction more attractive, but a higher fee does not guarantee the next block, a particular position, or a fixed confirmation time. The exact rules depend on the chain.
The transaction path: from broadcast to confirmation
1. Your wallet creates and signs a transaction
A wallet constructs a transaction containing the operation, destination or contract data, amount where applicable, and fee parameters required by that network. It signs the transaction with the account’s private key and sends the signed data to a node. The transaction is not yet part of the blockchain; it is only a candidate for inclusion.
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2. Nodes validate and relay it
The receiving node checks basic validity, such as the signature, account state or unspent-output rules, and whether the transaction meets the node’s relay policy. If it passes, the node stores it in its local transaction pool (often called a mempool) and relays it to peers. There is no guarantee that every node has exactly the same pool at the same moment. Propagation delays, local limits, replacement rules, and connectivity can produce different views.
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When a validator, miner, or Layer 2 sequencer is ready to construct a block or batch, it selects transactions that fit the available capacity and satisfy protocol rules. It then places them in a specific sequence. Transactions are executed in that sequence, so an earlier transaction can change the state seen by a later one. For example, a first transaction can consume a balance, alter a smart-contract variable, or change the price available to a later trade.
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4. The network accepts the block
The proposed block is broadcast for verification. Other participants check that every included transaction is valid in context and that the block follows consensus rules. Depending on the chain, the block may gain increasing finality or confirmation confidence as later blocks are added. “Included” and “final” are therefore distinct milestones: a transaction can appear in a block before the network treats that block as irreversible under its rules.
Why finite capacity creates a fee market
Blocks and batches have finite capacity. A producer cannot include every valid transaction waiting in all node pools, so demand above that capacity creates a queue. During quiet periods, many transactions fit quickly. During a spike in demand, users compete for scarce space and producers have more candidates than they can include immediately.
Fees are an economic signal in that competition. A producer may prefer a transaction that pays more, but fee level is only one input. Validity, transaction size, dependencies, local policy, timing, and the producer’s own incentives can also affect selection. Some systems define a protocol fee mechanism; others leave more of the policy to miners, validators, or sequencers.
A transaction can also be delayed even when its fee looks high. The fee may be below the current market for the relevant block, the transaction may be waiting behind a dependency, the sender may have submitted an invalid replacement, or the producer may use a policy that does not simply sort by the advertised fee. A fee estimate is consequently a forecast of competitiveness, not a promise.
Ethereum: base fee, priority fee, and maximum fee
Ethereum’s EIP-1559 fee model separates the protocol’s base fee from the validator incentive. A transaction specifies a maximum fee per gas and a priority fee (often called the tip). The protocol sets the base fee for a block according to network conditions. The base fee is burned, while the priority fee is paid to the validator that includes the transaction.
| Ethereum fee field | What it does | What it does not guarantee |
|---|---|---|
| Base fee | Protocol-determined minimum fee component for the block’s gas usage; it is burned. | It does not reserve a transaction’s place or guarantee immediate inclusion. |
| Priority fee | Tip offered to the validator as an incentive to include the transaction. | It does not guarantee the next block or a precise position. |
| Maximum fee | Upper limit the sender authorizes per unit of gas, covering the base fee plus any tip under the transaction’s rules. | It is not necessarily the amount ultimately paid; unused allowance is not simply a promise of faster service. |
When blocks are crowded, increasing the priority fee can make inclusion more attractive relative to competing transactions. Yet the validator still chooses a valid set that fits block limits, and other incentives may influence ordering. A transaction with a large maximum fee can remain pending if its effective fee is not competitive, if the network’s current base fee exceeds its limit, or if the wallet’s gas estimate was unsuitable for the operation.
Ethereum’s transaction-pool and validator-inclusion process also means that “pending” is local information. One node may display a transaction while another has not received it or has evicted it under its pool policy. Wallet interfaces should therefore label fee and confirmation estimates as estimates, not guarantees.
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Bitcoin does not use Ethereum’s gas model. Its developer documentation commonly describes miner selection in terms of fee per byte (more precisely, fee rate relative to transaction weight or virtual size in modern implementations). A miner chooses transactions that fit the block’s capacity and may prioritize those offering a higher fee rate. Relay policy can also reserve or treat a priority area differently from the ordinary fee market.
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Dependencies complicate a simple fee-rate sort. A transaction may spend an output created by an unconfirmed parent. If the parent’s fee rate is too low, the child can be unattractive on its own. Child Pays for Parent (CPFP), described in Bitcoin Improvement Proposal 331, lets a high-fee descendant be considered together with its low-fee parent. The package’s combined fee rate can make including both worthwhile.
| Bitcoin situation | Likely selection consideration |
|---|---|
| Independent transaction | Fee rate and transaction size, subject to miner policy and available block space. |
| Unconfirmed parent with a high-fee child | Package economics can raise the combined priority through CPFP. |
| Large transaction | It consumes more block capacity, so its total fee and fee rate must compete for the space it uses. |
Because Bitcoin and Ethereum express fees differently, a numerical fee level from one chain cannot be compared directly with a fee level from the other. Use the fee estimator and terminology native to the network you are using.
Layer 2 networks: the sequencer changes the picture
Layer 2 systems may batch transactions and later post data or commitments to another chain. Their fee derivation, fee recipient, and user-facing display can differ by platform. The OASIS Layer 2 fee specification notes that sequencing and transaction position may depend on factors such as timestamps or maximal extractable value (MEV), in addition to priority fees.
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Why transaction order has economic consequences
Order is not merely cosmetic. In a stateful blockchain, changing the sequence can change balances, contract outcomes, liquidation results, and the price available to traders. A producer may therefore gain value by choosing which transactions to include, which to exclude, and how to arrange them.
“Maximal extractable value (MEV) refers to the maximum value that can be extracted from block production in excess of the standard block reward and gas fees by including, excluding, and changing the order of transactions in a block.”
This definition from ethereum.org explains why a producer’s incentives can differ from a simple highest-fee-first queue. A transaction that pays a modest tip might be placed ahead of another if its position enables a more valuable strategy, subject to the protocol and the producer’s policies. MEV can involve arbitrage, liquidations, or other state-dependent opportunities; the exact mechanisms vary by chain and application.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesOrdering discretion does not mean producers can make invalid state transitions. Every included transaction must still pass consensus checks in its position. Nor does it mean every block is actively reordered for MEV. It means that where the protocol leaves discretion, ordering can carry value beyond the fee printed on the transaction.
Does paying more guarantee faster confirmation?
No. A higher fee generally improves a transaction’s incentive to be selected when producers are comparing otherwise eligible candidates, but it cannot guarantee a time or position.
- Capacity can still be full. More competitive transactions may arrive after yours, and a producer may fill the block with transactions that offer better effective economics for the space they consume.
- Protocol limits can block inclusion. On Ethereum, a maximum fee below the current base fee is not sufficient for inclusion. On Bitcoin, a transaction or package must satisfy the miner’s policy and fit the block.
- Dependencies can dominate. A child may wait for its parent, or a low-fee parent may require CPFP treatment on Bitcoin.
- Local pools differ. A wallet may show “pending” while the transaction has been dropped by some nodes, or it may not have propagated to the producer that eventually builds the block.
- Producers have discretion. Validator, miner, and sequencer policies can account for more than a single fee ranking, including MEV-related opportunities or timestamps.
- Finality is separate from inclusion. Even after a transaction enters a block, the chain may require additional consensus steps before the result is considered final.
For these reasons, no universal fee or confirmation-time number applies across blockchains. Conditions change with demand, transaction characteristics, block capacity, and current protocol or client behavior.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to choose a fee without treating an estimate as a promise
- Identify the exact network. Confirm whether the transaction is on a base layer or a Layer 2, and check the wallet’s current network selection.
- Read the fee fields in that network’s terms. Ethereum users should distinguish base fee, priority fee, and maximum fee. Bitcoin users should look at fee rate and transaction size. A Layer 2 may show a platform-specific derivation.
- Use the wallet’s current estimator. Select a speed target only as an estimate. Do not assume a “fast” label guarantees the next block.
- Check the transaction’s size or gas requirement. A larger operation consumes more scarce capacity. Smart-contract calls can require substantially more gas than a simple transfer, and Bitcoin transactions with more inputs or outputs occupy more space.
- Verify the sender’s balance and nonce or dependency state. On account-based systems, an earlier pending transaction from the same account can hold later transactions behind it. On UTXO systems, an unconfirmed parent can create a package dependency.
- After broadcasting, track the transaction by its identifier. Confirm whether it is seen by a block explorer or node, remains pending, has been replaced, or has been dropped. Treat explorer status as an observation, not a guarantee of finality.
- Use only network-supported replacement or acceleration methods. A replacement must satisfy that chain’s rules. On Bitcoin, CPFP can help when a suitable child transaction is possible; on Ethereum, replacement transactions must follow the wallet and node’s nonce and fee policies.
What to do when a transaction is stuck
Ethereum account transaction
Check whether the transaction’s maximum fee can cover the current base fee and whether an earlier transaction from the same account is still pending. If the wallet supports replacement, follow its documented procedure for submitting a new transaction with the same nonce and a fee that meets current replacement rules. Do not submit conflicting replacements blindly; confirm which transaction the wallet is tracking and whether the original was already included.
Bitcoin transaction
Check the fee rate, virtual size, and whether the transaction spends an unconfirmed output. If the wallet supports it and the transaction structure permits it, a CPFP child can raise the combined package’s fee rate. Otherwise, waiting for demand to fall may be the safest option. Avoid assuming that an unconfirmed transaction has disappeared merely because one service no longer displays it; node pools and retention policies differ.
Layer 2 transaction
Check the Layer 2’s own status page or documentation for sequencer delays, batch posting, replacement rules, and finality definitions. A transaction can be accepted in the Layer 2 queue while its batch waits for the underlying chain. Increasing a fee on the settlement chain may not change a sequencer’s internal position.
Quick Recap
Comparing ordering systems at a glance
| Dimension | Ethereum | Bitcoin | Layer 2 example |
|---|---|---|---|
| Block or batch builder | Validator proposes or includes transactions under Ethereum’s consensus process. | Miner selects transactions for a block. | Sequencer orders transactions for a platform-specific batch. |
| Fee expression | Base fee plus priority fee, bounded by a maximum fee per gas. | Fee rate relative to transaction size or weight. | Derivation and display vary by platform. |
| Fee’s main influence | Priority fee affects validator incentive; base fee is a protocol requirement and is burned. | Fee rate commonly affects miner selection, subject to policy and dependencies. | Priority and platform rules can both affect sequencing and inclusion. |
| Capacity constraint | Block gas and other protocol limits. | Block size or weight limits. | Batch and data-posting constraints, plus sequencer policy. |
| Ordering discretion | Validator and builder choices can create MEV opportunities. | Miner policy and transaction dependencies influence order. | Sequencer rules may consider timestamps, MEV, and priority fees. |
| Finality timing | Inclusion and finality are separate stages. | Confidence generally increases with additional blocks. | Layer 2 acceptance, batch posting, and underlying-chain finality can be separate events. |
The practical rules to remember
- A pending transaction lives in node-local pools until a producer selects it.
- Finite block or batch capacity is what turns demand into a waiting queue.
- Fees influence incentives, but they do not create a guaranteed place in line.
- Ethereum’s base fee and priority fee are different; Bitcoin’s fee-rate model is not Ethereum gas.
- Dependencies, local relay policy, producer discretion, and MEV can change the apparent order.
- Layer 2 networks can apply their own fee and sequencing rules.
- Use current, chain-specific wallet estimates and treat every speed label as an estimate rather than a promise.
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