How Bitcoin Works Explained: Blockchain, Transactions and Proof of Work
Understanding how Bitcoin works means looking beyond the price of BTC and into the network underneath it.
Bitcoin is not a company, bank or database controlled by one administrator. It is a peer-to-peer monetary network in which independent computers follow shared rules for validating transactions and blocks.
The blockchain records confirmed transaction history. Digital signatures authorize spending. Miners use proof of work to compete for new blocks. Full nodes independently check those blocks and reject information that breaks Bitcoin’s consensus rules.
That combination explains how Bitcoin works without requiring one institution to maintain the master ledger.
From a user’s perspective, the process can look simple. Open a wallet, enter an address and amount, approve the payment and press send.
Behind that action, however, the network must determine whether the Bitcoin being spent exists, whether it has already been spent, whether the transaction is properly authorized and whether it follows the protocol’s rules.
Bitcoin.org describes the blockchain as a shared public ledger containing confirmed transactions, while mining provides the distributed process through which pending transactions can be incorporated into that history.
This guide explains how Bitcoin works step by step, from a wallet creating a transaction to that transaction becoming part of the blockchain.
For the broader overview of the asset, begin with Bitcoin Explained.
How Bitcoin Works at a Glance
| Stage | What Happens |
|---|---|
| 1. Keys | A wallet manages cryptographic keys |
| 2. Transaction | Spendable Bitcoin outputs are selected |
| 3. Signature | The transaction receives cryptographic authorization |
| 4. Broadcast | The transaction is sent into Bitcoin’s peer-to-peer network |
| 5. Validation | Nodes independently check it |
| 6. Mempool | Valid unconfirmed transactions may wait for a block |
| 7. Mining | Miners construct candidate blocks and perform proof of work |
| 8. Block | A miner finds a valid block |
| 9. Verification | Full nodes verify the new block |
| 10. Confirmation | The transaction becomes part of blockchain history |
This process is the simplest practical way of understanding how Bitcoin works.
How Bitcoin Works as a Peer-to-Peer Network
The first concept behind how Bitcoin works is peer-to-peer communication.
Bitcoin does not send every payment through one central server.
Computers participating in the network connect to peers and exchange transactions and blocks.
Bitcoin’s developer documentation describes full nodes as peers that verify blocks and transactions before relaying valid information to other participants.
A node can receive a transaction from one peer, check it and relay it onward.
The same broad process applies when a miner discovers a new block.
This means there is no single Bitcoin computer whose failure would shut down the entire network.
More importantly, participants do not have to trust information merely because another participant sent it.
They can verify it.
That independent verification is fundamental to how Bitcoin works.
What Does a Bitcoin Wallet Actually Store?
A Bitcoin wallet is often described as a place where Bitcoin is stored.
That explanation is convenient but technically inaccurate.
Bitcoin is represented through transactions and spendable outputs recorded by the network.
A wallet primarily manages the cryptographic information needed to control those outputs.
Three concepts matter.
Private key: Secret cryptographic information used to authorize spending.
Public key: Information mathematically related to the private key that participates in transaction verification.
Bitcoin address: A user-friendly representation used as a payment destination.
Bitcoin.org explains that private keys are used to sign transactions, providing mathematical proof that the authorized holder approved the spend.
This is why controlling keys is so important.
The wallet is essentially a tool for managing authority over Bitcoin rather than a digital container filled with coins.
How Bitcoin Works With UTXOs
Bitcoin does not maintain account balances in the same way a traditional bank does.
Instead, how Bitcoin works revolves around the:
Unspent Transaction Output model
usually shortened to:
UTXO
A Bitcoin transaction creates outputs.
If one of those outputs has not yet been spent, it is an Unspent Transaction Output.
A later transaction can use that output as an input.
Once successfully spent, that particular output cannot be spent again.
Bitcoin’s developer documentation explains that transaction inputs reference earlier outputs and that each output can only be spent once. This is fundamental to preventing double spending.
Think of UTXOs somewhat like individual pieces of digital value rather than one editable account balance.
A Simple Bitcoin Transaction Example
Suppose Sara controls a UTXO worth:
0.010 BTC
She wants to send Omar:
0.006 BTC
Her wallet might construct this transaction:
| Transaction Component | Amount |
|---|---|
| Existing input | 0.010 BTC |
| Payment to Omar | 0.006 BTC |
| Change to Sara | 0.0039 BTC |
| Transaction fee | 0.0001 BTC |
The original 0.010 BTC output is completely consumed.
The transaction then creates new outputs.
One belongs to Omar.
Another returns change to Sara.
The difference between the total inputs and total outputs becomes the transaction fee.
This demonstrates how Bitcoin works differently from a bank ledger.
The protocol is not merely changing:
Sara = 10
to:
Sara = 4
and:
Omar = 6.
Instead, old transaction outputs are consumed and new outputs are created.
How Bitcoin Works With Digital Signatures
If Bitcoin’s transaction history is public, why can’t somebody simply spend another person’s BTC?
Because spending requires valid cryptographic authorization.
A wallet uses a private key to create the required digital signature.
Bitcoin nodes can verify that signature without learning the secret private key itself.
That mechanism is an essential part of how Bitcoin works.
The private key remains private.
The resulting authorization can be publicly verified.
Modern Bitcoin supports different script and signature constructions. Taproot, introduced through a 2021 protocol upgrade, added Schnorr-signature-based spending rules alongside older Bitcoin mechanisms.
How Bitcoin Works When You Press Send
Imagine Sara has finished constructing her payment.
Her wallet signs the transaction and broadcasts it to Bitcoin peers.
A receiving node checks whether the transaction satisfies the conditions required by that node.
If acceptable, the transaction can be forwarded to additional peers.
Soon, miners and nodes across the network may know about it.
But the transaction has not necessarily been confirmed.
This distinction is critical to understanding how Bitcoin works.
A transaction can exist on the peer-to-peer network before becoming part of the blockchain.
That brings us to the mempool.
What Is the Bitcoin Mempool?
A mempool, short for memory pool, is a node’s collection of unconfirmed transactions that it currently considers eligible to remain pending.
There is an important detail:
There is no single global Bitcoin mempool.
Every node can maintain its own mempool based on the transactions it receives and its policy settings.
One node may know about a transaction before another.
Different nodes can also have somewhat different local policies.
Bitcoin’s developer documentation explains that full peers can maintain collections of unconfirmed transactions that may later be included in blocks.
Therefore how Bitcoin works involves both:
consensus rules, which determine what the blockchain can accept;
and
network policies, which influence how unconfirmed transactions are stored and relayed.
They are related, but they are not exactly the same thing.
Why Bitcoin Fees Change
Bitcoin does not have one permanent transaction fee.
Block space is scarce.
When many users want transactions confirmed, they compete for that limited space.
Miners generally have an economic incentive to select transactions offering attractive fees relative to the amount of block capacity they consume.
This is why transaction fees are commonly considered in terms of a:
fee rate
rather than the monetary value being transferred.
A $1 million Bitcoin transfer does not automatically require a bigger network fee than a $100 payment.
The data structure of the transaction can matter more.
Bitcoin’s transaction documentation explains that fees arise from the difference between transaction inputs and outputs and that demand for block space can cause appropriate fee rates to rise.
Understanding fee competition is an important part of how Bitcoin works during busy periods.
How Bitcoin Works Through Mining
Mining is probably the most famous and misunderstood part of Bitcoin.
Bitcoin miners do not simply “create coins.”
Their primary network role involves constructing candidate blocks and performing proof-of-work calculations.
Miners choose valid transactions they want to include in candidate blocks.
They then repeatedly perform hashing calculations, searching for a block header that satisfies Bitcoin’s current proof-of-work target.
When one succeeds, it can broadcast the proposed block to other participants.
Bitcoin’s developer documentation describes mining as the process through which blocks containing transactions are created while proof of work establishes the computational effort behind the chain.
But finding a block does not give the miner absolute power.
Other nodes still verify it.
Miners Propose, Nodes Verify
This distinction is one of the most important things to understand about how Bitcoin works.
Suppose a miner tries to create:
1,000 BTC
for itself when Bitcoin’s consensus rules allow only the normal block subsidy and transaction fees.
The miner might successfully perform proof of work.
That still does not make the invalid Bitcoin legitimate.
Full nodes independently check the block.
Bitcoin Core’s validation documentation specifically notes that full validation prevents miners from making users accept blocks that violate rules such as Bitcoin’s monetary limit.
A useful summary is:
Miners propose blocks.
Nodes validate blocks.
Mining power matters enormously, but miners do not independently define Bitcoin’s rules.
How Bitcoin Works With Proof of Work
Bitcoin’s consensus mechanism uses:
Proof of Work
Miners repeatedly hash candidate block headers.
Most attempts fail.
Eventually, a miner may produce a hash satisfying the current target.
Producing this proof requires substantial computation.
Checking whether the proof is valid is comparatively easy.
The original Bitcoin white paper describes transactions being broadcast to nodes, grouped into blocks and secured through proof of work, with accepted blocks forming an increasingly costly history to rewrite.
That asymmetry is central to how Bitcoin works.
Creating valid proof of work is expensive.
Verifying it is inexpensive.
Why Proof of Work Protects Bitcoin History
Every block refers to the previous block.
Changing an old transaction would change the cryptographic information associated with the block containing it.
That would affect later relationships in the chain.
An attacker attempting to replace old blockchain history would therefore need to build an alternative valid chain with sufficient accumulated proof of work.
The deeper a transaction sits beneath later blocks, the greater the amount of additional work built above it.
This is why Bitcoin confirmations matter.
Proof of work does not make changing history metaphysically impossible.
It makes successful rewriting increasingly difficult and economically costly.
What Is Inside a Bitcoin Block?
A block contains transaction data plus a block header.
The header contains several critical pieces of information, including:
- the hash of the previous block header;
- a Merkle root committing to transaction information;
- a timestamp;
- difficulty-related information;
- a nonce used during mining.
The previous-block hash creates the chain.
Bitcoin’s developer documentation explains that changing a recorded transaction changes the cryptographic commitments connected with its block and therefore conflicts with later blocks.
This chained history is where the word:
blockchain
comes from.
What Is a Merkle Root?
A block may contain many transactions.
Bitcoin summarizes their cryptographic relationships using a structure called a:
Merkle tree
Transaction hashes are combined repeatedly until one resulting hash remains.
That final value is the:
Merkle root
The Merkle root is placed inside the block header.
Changing relevant transaction data changes the resulting commitment.
Merkle structures also allow efficient proofs that particular transactions are included within a block.
They are therefore another important component of how Bitcoin works beneath the user interface.
Why Bitcoin Targets One Block Every 10 Minutes
Bitcoin targets an average block interval of approximately:
10 minutes.
It is an average, not a timetable.
There is no network clock that says:
“Ten minutes have passed, release another block.”
Mining is probabilistic.
One block may appear very quickly.
Another could take considerably longer.
Over time, Bitcoin’s difficulty mechanism attempts to keep the average around the target interval.
That mechanism allows how Bitcoin works to remain broadly predictable even when the amount of computing power dedicated to mining changes dramatically.
How Bitcoin Difficulty Adjustment Works
Bitcoin adjusts mining difficulty every:
2,016 blocks.
At an average of 10 minutes per block, this corresponds to roughly two weeks.
If recent blocks have been produced too quickly, mining difficulty can increase.
If they have been produced too slowly, it can decrease.
No central administrator decides the new difficulty manually.
The network calculates the adjustment according to its rules.
This automatic feedback mechanism is one of the most important engineering features behind how Bitcoin works.
It allows Bitcoin to continue targeting approximately the same block-production rate even as miners enter or leave the network.
How New Bitcoin Enters Circulation
The first transaction inside a Bitcoin block is a special transaction known as the:
coinbase transaction.
It allows the successful miner to claim the permitted block subsidy plus applicable transaction fees.
As of September 2026, Bitcoin’s current block subsidy is:
3.125 BTC.
The fourth Bitcoin halving occurred on April 20, 2024, at block 840,000.
The next halving is expected around 2028 at block 1,050,000, reducing the subsidy to:
1.5625 BTC.
This predictable issuance schedule helps explain how Bitcoin works as a monetary system, not only as a transaction network.
For the full economics of this process, the dedicated Bitcoin Halving Explained article should own that search intent.
What Is a Bitcoin Confirmation?
When an unconfirmed transaction is included in an accepted block, it receives its first confirmation.
When another block is built on top, the transaction becomes deeper in the blockchain history.
Additional blocks create additional confirmations.
Why does that matter?
Occasionally, competing valid blocks can appear close together.
The network ultimately converges around the valid chain containing the greatest cumulative proof of work.
A transaction sitting deeper inside that chain becomes progressively more difficult to replace.
This is another crucial piece of how Bitcoin works.
Bitcoin therefore provides increasing settlement confidence rather than relying on a central company to stamp a transaction “permanently final.”
How Many Bitcoin Confirmations Are Needed?
There is no universal answer.
The appropriate number depends on:
transaction value,
risk tolerance,
merchant policy,
and circumstances.
A coffee purchase and a multimillion-dollar settlement clearly do not present identical risks.
Bitcoin educational material has historically referenced six confirmations as a conservative benchmark for higher-value transactions, but different applications use different standards.
The broader principle is simple:
more confirmations generally mean greater confidence.
What Prevents Bitcoin Double Spending?
A double spend attempts to spend the same transaction output twice.
Bitcoin’s UTXO rules prevent both competing spends from remaining valid in the same accepted blockchain history.
Nodes verify whether the inputs a transaction references remain unspent.
If an output has already been validly spent, another transaction attempting to spend that same output cannot also be accepted in the same chain.
Bitcoin’s developer guide describes outputs as either spent or unspent and states that a valid payment must use available UTXOs as inputs.
Preventing double spending is at the heart of how Bitcoin works without a traditional financial intermediary.
How Bitcoin Works Through Full Nodes
A full node independently verifies Bitcoin’s blockchain.
It does not simply ask a miner:
“Is this block valid?”
and trust the answer.
It checks for itself.
Full-node validation includes rules covering:
transaction validity,
proof of work,
spending conditions,
block requirements,
monetary issuance,
and other consensus constraints.
Bitcoin Core’s validation documentation emphasizes that each full node verifies every received block rather than trusting the miner that produced it.
This independent validation is arguably the most important decentralization mechanism in how Bitcoin works.
Full Nodes vs Miners
These roles are sometimes confused.
| Participant | Primary Role |
|---|---|
| Full node | Verifies blocks and transactions |
| Miner | Builds candidate blocks and performs proof of work |
| Wallet | Manages keys and creates transactions |
| User | Chooses software/services and sends or receives Bitcoin |
| Developer | Writes and proposes software improvements |
A miner may also operate nodes.
A wallet provider may run nodes.
The categories can overlap.
But the responsibilities are conceptually different.
Understanding those differences makes how Bitcoin works much easier to understand.
What Is Bitcoin Core?
Bitcoin Core is a major open-source Bitcoin implementation.
It includes full-node functionality and other components used by people participating directly in the network.
Bitcoin Core is not a company controlling Bitcoin.
Nor is Bitcoin Core itself identical to the Bitcoin network.
It is software implementing the network’s rules.
As of 2026, Bitcoin Core 31.0 is available, with the release introducing changes including a redesigned “cluster mempool” along with performance and software improvements.
That current development activity shows that Bitcoin software can continue evolving even while major consensus changes remain deliberately difficult.
Who Can Change Bitcoin?
Nobody has a simple administrator password for Bitcoin.
Developers can propose code.
Miners can choose which valid transactions to include.
Node operators decide which software they run.
Businesses decide which network they support.
Users decide what they recognize and use as Bitcoin.
Bitcoin.org describes changes as requiring broad voluntary consensus rather than being dictated by one person or company.
That governance model is another layer of how Bitcoin works.
The technical rules exist in software, but decentralized networks also depend on humans deciding which software and rule changes they accept.
SegWit Changed How Bitcoin Works
Bitcoin today is not technically identical to Bitcoin in 2009.
One major upgrade was:
Segregated Witness
or:
SegWit.
SegWit activated in 2017.
It introduced a separate witness structure for signature-related transaction data and changed how Bitcoin accounts for block resources.
BIP 141 defines modern Bitcoin’s maximum block weight as:
4,000,000 weight units.
This matters because saying Bitcoin simply has a “1 MB block limit” no longer accurately describes the modern consensus structure.
SegWit also addressed transaction-malleability issues that were important for higher-layer systems.
Taproot Changed How Bitcoin Works Again
Another major upgrade was:
Taproot.
Taproot activated in 2021.
BIP 341 introduced new SegWit version 1 spending rules based on Taproot, Schnorr signatures and Merkle-based script structures.
Among its goals were improved:
efficiency,
scripting flexibility,
and privacy characteristics for certain types of transactions.
Taproot does not make Bitcoin anonymous.
Bitcoin’s blockchain remains publicly observable.
Instead, some complex spending arrangements can reveal less unnecessary information when particular spending paths are used.
Understanding SegWit and Taproot helps explain how Bitcoin works today rather than relying on an outdated 2009 description.
Can Full Nodes Delete Old Blockchain Data?
Yes, under certain configurations.
A full node does not necessarily have to retain every historical block forever.
Bitcoin supports:
pruned full nodes.
A pruned node downloads and validates blockchain history but can later discard older block data while maintaining the state needed to continue validating future blocks.
An:
archival node
retains the historical blockchain data.
Bitcoin’s developer documentation distinguishes these operating approaches while noting that full validation can still be performed by pruned full nodes.
This means how Bitcoin works does not require every validating computer to permanently store every byte ever produced.
Why Bitcoin Cannot Put Unlimited Transactions in Every Block
Increasing block capacity sounds simple.
Just allow enormous blocks.
But decentralized validation creates trade-offs.
Full nodes must download, process and validate blockchain data.
If resource requirements become extremely high, operating an independent node becomes more difficult.
That can push validation toward organizations capable of running increasingly expensive infrastructure.
Bitcoin therefore places limits on block resources.
The result is scarce base-layer capacity.
Scarcity produces fee competition.
It also encourages development of scaling technologies that move some activity away from the blockchain while still ultimately settling through Bitcoin.
The most important example is the Lightning Network.
How Bitcoin Works With the Lightning Network
The Lightning Network is a higher-layer payment system built around Bitcoin.
It allows participants to use payment channels rather than recording every intermediate payment directly in Bitcoin blocks.
That can enable much faster and lower-cost payments in appropriate circumstances.
However, Lightning introduces additional concepts such as:
channels,
liquidity,
routing,
inbound capacity,
and channel management.
Those details deserve their own article.
For this cluster, the key distinction is:
how Bitcoin works on its base blockchain is not identical to how Lightning payments work.
The dedicated Bitcoin Lightning Network Explained cluster should own that deeper search intent.
Bitcoin Is More Than a Blockchain
Calling Bitcoin “blockchain technology” is incomplete.
The blockchain matters enormously.
But Bitcoin also requires:
peer-to-peer networking,
cryptographic authorization,
UTXOs,
consensus rules,
nodes,
mining,
proof of work,
economic incentives,
software,
and users.
The blockchain is the durable historical result created by those systems working together.
Understanding that distinction is necessary for understanding how Bitcoin works accurately.
How Bitcoin Works From Start to Finish
Consider one complete payment.
Sara wants to pay Omar.
Her wallet identifies UTXOs she controls.
It constructs a transaction.
It creates an output for Omar.
It may create another output returning change to Sara.
It calculates a fee.
Sara’s wallet signs the required data.
The transaction is broadcast.
Peers receive it.
Nodes validate it.
Valid nodes may relay it.
The transaction may enter mempools.
Miners consider it for candidate blocks.
Miners perform proof of work.
One miner discovers a valid block.
That miner broadcasts the block.
Full nodes independently verify it.
If valid, they add it to their accepted blockchain history.
Omar’s transaction now has its first confirmation.
Subsequent valid blocks add further confirmations.
That complete process is how Bitcoin works without requiring one bank to approve, record and settle the transaction.
Frequently Asked Questions About How Bitcoin Works
How does Bitcoin work in simple terms?
How Bitcoin works can be summarized as users creating cryptographically authorized transactions, nodes checking those transactions, miners ordering them into blocks using proof of work and full nodes independently validating the resulting blockchain.
Does Bitcoin run on one server?
No. Bitcoin uses a peer-to-peer network of independent participants rather than one central server.
Where is Bitcoin actually stored?
Bitcoin is represented through spendable transaction outputs recorded by the network. Wallets manage the keys required to control those outputs.
What is a UTXO?
A UTXO is an Unspent Transaction Output. It is an output created by an earlier transaction that remains available to be used as an input in a later valid transaction.
What happens after I send Bitcoin?
The transaction is signed, broadcast to network peers, checked by nodes and potentially stored in mempools until a miner includes it in a block.
What does a Bitcoin miner actually do?
Miners construct candidate blocks and perform proof-of-work calculations. A successful miner proposes a new block, but full nodes still independently determine whether it satisfies Bitcoin’s consensus rules.
Why does Bitcoin use proof of work?
Proof of work establishes costly computational work behind blocks and makes replacing confirmed blockchain history progressively harder.
How often is a Bitcoin block created?
Bitcoin targets one block approximately every 10 minutes on average. Individual block times vary because mining is probabilistic.
What is Bitcoin mining difficulty?
Mining difficulty determines how difficult finding valid proof of work is. Bitcoin adjusts difficulty every 2,016 blocks to keep average block production near its intended rate.
What is the current Bitcoin block subsidy?
The block subsidy is 3.125 BTC following the April 20, 2024 halving.
When is the next Bitcoin halving?
The next halving is estimated for 2028, at block 1,050,000, when the subsidy is expected to fall to 1.5625 BTC.
Can miners create unlimited Bitcoin?
No. Full nodes enforcing Bitcoin’s accepted consensus rules reject blocks that violate the permitted issuance rules.
Does Taproot make Bitcoin private?
No. Taproot improves privacy characteristics for some spending structures, but Bitcoin transactions remain recorded on a publicly observable blockchain.
Conclusion: How Bitcoin Works Without a Central Bank
The central question behind how Bitcoin works is not really about digital coins.
It is about agreement.
How can thousands of independent computers agree about which transactions are legitimate without appointing one bank, government or company as the permanent master record keeper?
Bitcoin’s answer combines several technologies and economic mechanisms.
UTXOs represent spendable transaction outputs.
Private keys authorize spending.
Digital signatures allow authorization to be verified.
Peer-to-peer networking distributes transactions and blocks.
Mempools hold unconfirmed transactions.
Miners compete through proof of work.
Blocks cryptographically reference earlier blocks.
Difficulty adjusts as mining conditions change.
Full nodes independently enforce the consensus rules.
That is how Bitcoin works at its base protocol level.
Understanding those pieces also eliminates several common misconceptions.
Bitcoin is not stored as digital coins inside a wallet.
Miners do not have unlimited control over Bitcoin.
A transaction is not necessarily confirmed simply because it has been broadcast.
Bitcoin does not operate through conventional account balances.
Transaction fees are not determined mainly by the monetary amount being sent.
And decentralization does not mean Bitcoin has no rules.
In reality, Bitcoin depends on extremely strict rules.
The key difference is that independent participants can verify those rules themselves.
That distinction explains much of Bitcoin’s resilience and much of its complexity.
Bitcoin also continues to evolve.
SegWit changed transaction structure and block-resource accounting.
Taproot expanded Bitcoin’s scripting and signature capabilities.
Bitcoin Core continues receiving software updates, with version 31.0 available in 2026.
At the same time, some core economic rules remain familiar.
The current block subsidy is 3.125 BTC.
The next halving is expected around 2028.
Bitcoin’s issuance continues moving toward its long-term supply limit.
As block subsidies continue falling, transaction fees are expected to become a larger part of miner revenue.
Those economics deserve deeper treatment in the future Bitcoin Mining Explained and Bitcoin Halving Explained clusters.
Likewise, this article should not become a complete wallet-security tutorial.
Bitcoin Wallets Explained should own wallet types, seed phrases, hardware devices and custody.
Bitcoin Security Explained should own private-key protection, phishing, scams and self-custody risks.
Bitcoin Lightning Network Explained should own payment channels, routing and liquidity.
The main Bitcoin Explained pillar introduces the complete entity.
This page owns the technical mechanics behind how Bitcoin works.
That separation is important for SEO as well as readers.
Ultimately, how Bitcoin works can be summarized through one principle:
A participant does not receive the final word merely because it claims something is valid.
Transactions must satisfy rules.
Blocks must satisfy rules.
Proof of work must satisfy rules.
And independent nodes can verify those rules for themselves.
That combination of cryptography, peer-to-peer networking, proof of work and decentralized validation forms the technical foundation beneath Bitcoin.
Primary Research Sources
For readers who want to examine the underlying documentation:
Bitcoin.org — How Bitcoin Works
Bitcoin Developer Guide — Blockchain
Bitcoin Developer Guide — Transactions
Bitcoin Developer Guide — Peer-to-Peer Network
Bitcoin Core — Full Validation
Bitcoin Core 31.0 Release Notes
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