What Is Bitcoin and How Does It Work?

When the original version of this post was written, Bitcoin had just come off a painful crash from nearly $69,000 to below $17,000. The “future of Bitcoin” sections were speculative. The institutional adoption section was aspirational. The Lightning Network was a technical curiosity.

In 2026, much of that speculation has resolved into fact — and some of it has resolved differently than most analysts expected. Bitcoin reached a new all-time high of $126,198 in October 2025 before experiencing a sharp retracement, closing 2025 near $87,000 amid fading momentum and macro uncertainty. $130B+ now sits in US spot Bitcoin ETFs, and over 3.5% of the entire 21 million coin supply is held on public-company balance sheets as of mid-2026. As of 2026, approximately 1.32 million BTC remain unmined — less than 7% of total supply — while an estimated 3–4 million BTC are considered permanently lost due to forgotten keys or destroyed wallets.

This is a different asset than the one described in the 2022 post. Here is an honest, current account of what Bitcoin is, how it works, and what has actually changed.

The Origins: Still the Same, Still Relevant

The foundational story hasn’t changed, and it still matters for understanding why Bitcoin was built the way it was.

Bitcoin was introduced in October 2008 — during the peak of the global financial crisis — through a whitepaper titled “Bitcoin: A Peer-to-Peer Electronic Cash System” published under the pseudonym Satoshi Nakamoto. The paper outlined a system for transferring value electronically without requiring trust in any intermediary — no bank, no government, no payment processor. In January 2009, Nakamoto mined the genesis block, and embedded in its data was a headline from The Times: “Chancellor on brink of second bailout for banks.” The choice was deliberate. Bitcoin was designed explicitly as an alternative to a financial system that had just demonstrated its fragility.

Nakamoto disappeared from public view by 2010–2011, handing the project to other developers, and has never been credibly identified. That anonymity is itself part of Bitcoin’s design philosophy: a currency that depends on any individual or institution for its continued operation is not truly decentralised.

How Bitcoin Actually Works: The Technical Layer

Blockchain

Every Bitcoin transaction is recorded on a blockchain — a distributed ledger replicated across tens of thousands of computers simultaneously, with no single owner or administrator. Each block in the chain contains a batch of validated transactions and a cryptographic reference to the previous block, creating a sequential, tamper-evident record stretching back to the genesis block in January 2009.

The critical property of this structure is immutability: altering any historical transaction would require recomputing the cryptographic proofs for every subsequent block faster than the entire network combined — computationally infeasible in practice. This is why the blockchain can function as a trusted record without a trusted record-keeper.

Mining and Proof-of-Work

New transactions are validated and added to the blockchain through mining — a competitive process in which specialised computers (ASICs) race to solve a computationally difficult mathematical puzzle. The first miner to solve it broadcasts the valid block to the network and receives a block reward of newly issued Bitcoin plus transaction fees from the included transactions.

This system is called proof-of-work. Its purpose is elegant: making it expensive (in electricity and hardware) to participate dishonestly, while making it profitable to participate honestly. An attacker who wanted to rewrite transaction history would need to outcompete the honest mining network — currently running at an average hash rate near 1,024 EH/s — which is prohibitively expensive at any realistic scale.

The Halving

Bitcoin’s issuance is programmatically capped and halves approximately every four years. In April 2024, the fourth halving reduced the block reward from 6.25 BTC to 3.125 BTC per block. The next halving in 2028 will reduce it further to 1.5625 BTC. This predictable supply schedule is one of Bitcoin’s most distinctive properties — and the mechanism most cited by institutional investors as a structural driver of long-term price appreciation, since decreasing new supply against sustained or growing demand is historically bullish.

Wallets and Transactions

Bitcoin is held in wallets — software that stores your private keys, which are the cryptographic credentials that prove ownership and authorise transfers. Your public key (or derived address) is what you share to receive Bitcoin; your private key must be kept secret, because whoever controls it controls the Bitcoin.

Transactions are broadcast to the network, validated by miners, and become irreversible once confirmed in the blockchain. This irreversibility is a feature (no chargebacks, no freezes) and a risk (no recovery from loss or theft of private keys).

The Institutional Era: What the January 2024 ETF Approval Actually Changed

This is the section the original post couldn’t have written, and it is the most consequential development in Bitcoin’s history since its launch.

In January 2024, the U.S. Securities and Exchange Commission approved spot Bitcoin ETFs — exchange-traded funds that hold actual Bitcoin and trade on traditional stock exchanges. The approval came after years of rejections and fundamentally changed who can own Bitcoin and how they can hold it.

Before the January 2024 ETF approval, regulated institutional ownership was effectively zero. In under 30 months it became the dominant marginal buyer. A pension can now hold BlackRock’s IBIT in the same brokerage account as Apple stock. That is the entire unlock.

The numbers that followed reflect the scale of that unlock:

Bitcoin ETF AUM grew to over $135 billion by late January 2026, with projections suggesting total ETF AUM could follow a structural path toward $400 billion as allocations from advised wealth rise.
BlackRock’s IBIT hit $54.12B AUM as of February 2026.
MicroStrategy’s Bitcoin holdings increased to 687,410 BTC — a corporate treasury strategy that has since been replicated by dozens of publicly traded companies.
74% of family offices are now exploring or investing in digital assets.
60% of institutional investors report they prefer to gain exposure to crypto through regulated vehicles like ETFs.

The price behaviour that followed is consistent with this structural shift. From a long-term return perspective, Bitcoin has been one of the best-performing assets of the past decade, outpacing gold, equities, and real estate by wide margins. But the 2025 cycle saw Bitcoin fall from $126,000 to lows near $80,000 in a matter of months — a reminder that institutional adoption has reduced but not eliminated Bitcoin’s defining characteristic: volatility.

The Regulatory Transformation

The original post’s section on regulation was cautious and vague. The 2026 picture is far more concrete — and meaningfully more positive for Bitcoin than most analysts predicted in 2022.

The GENIUS Act (late 2025) streamlined custody and reporting, normalising Bitcoin in institutional portfolios and reducing compliance friction. The broader U.S. Clarity Act narrative has been advancing through 2026, and regulatory clarity is increasingly cited by institutional investors as the primary reason their compliance teams have signed off on Bitcoin allocations.

El Salvador’s adoption of Bitcoin as legal tender — mentioned in the original post as a notable outlier — remains a data point more significant for its symbolism than its economic impact. More consequential for markets is the U.S. government’s shift from enforcement-heavy posture toward structured regulatory frameworks, and growing discussion of Bitcoin as a strategic reserve asset in government treasury circles.

The honest caveat: regulation remains the most significant unpredictable variable in Bitcoin’s medium-term price. Clear and favourable regulation can unlock institutional capital. Hostile enforcement actions or exchange bans can trigger rapid market-wide sell-offs. Regulatory risk has not disappeared — it has become more structured and therefore more legible, which is progress, but not certainty.

Supply Scarcity: The Math That Drives the Long-Term Case

This is the argument Bitcoin’s most serious long-term investors make, and it’s grounded in arithmetic rather than speculation.

Bitcoin’s hard cap is 21 million coins. As of 2026, approximately 1.32 million BTC remain unmined — less than 7% of total supply — while an estimated 3–4 million BTC are considered permanently lost. That means the effective tradeable float is somewhere between 16 and 17 million BTC — and shrinking, as long-term holders and institutional investors acquire and hold.

In 2025, about 69% of the total Bitcoin supply was held by long-term holders, reducing liquid circulation. When demand from ETF inflows, corporate treasury buyers, and retail investors competes for a supply that is simultaneously fixed in total, declining in new issuance (due to halvings), and contracting in liquid float (due to long-term holding), the price mathematics are structurally different from any asset with elastic supply.

This is the core of the “digital gold” thesis — and also its primary limitation. Gold is used industrially and has centuries of monetary precedent. Bitcoin’s value case rests almost entirely on this supply scarcity narrative and on network effects. Those are real, but they are not self-evidently sufficient at any price level.

The Lightning Network: From Curiosity to Infrastructure

The original post mentioned the Lightning Network as a future solution to Bitcoin’s scalability problems. In 2026, it is live infrastructure.

Bitcoin’s Lightning Network now channels over 5,200 BTC (around $10 billion) in capacity, with recent data showing records above 5,600–5,637 BTC, driven largely by institutional and exchange adoption. The Lightning Network enables near-instant Bitcoin payments at fees of fractions of a cent, resolving the two complaints (slow and expensive) that made Bitcoin impractical as a payment medium during periods of network congestion.

For businesses or individuals interested in Bitcoin as a payment mechanism — particularly for cross-border remittances where it remains genuinely competitive — the Lightning Network has made that case meaningfully stronger since 2022.

The Environmental Question: Progress, But Not Resolution

Bitcoin’s energy consumption remains the most persistent criticism, and the honest answer in 2026 is that significant progress has been made without the issue being resolved.

Bitcoin’s annual electricity use is now estimated at 155–176 TWh, with renewable energy accounting for approximately 52–55% of that total — reflecting updated Cambridge CBECI ranges. The majority of Bitcoin’s energy consumption now comes from renewable sources, and the industry has made measurable progress on sustainability arguments. The counterargument — that even 48% of 155+ TWh from non-renewable sources represents a significant ongoing environmental cost — remains mathematically valid.

The environmental criticism is neither as damning as it was framed in 2021 (when renewable estimates were lower) nor as easily dismissed as Bitcoin advocates sometimes suggest. It remains a genuine consideration for ESG-focused institutions and governments, and one that the industry continues to have an interest in addressing.

What the 2026 Price Picture Actually Looks Like

For a post about what Bitcoin is and how it works, honest price context matters — even with the caveat that Bitcoin price forecasting has a notoriously poor track record across almost all analyst types.

Bitcoin reached a new all-time high of $126,198 in October 2025 before experiencing a sharp retracement, closing the year near $87,000. As of mid-2026, Bitcoin is trading in the $60,000–$80,000 range, with analysts broadly split on the trajectory:

Bernstein, Standard Chartered, and Citi all forecast Bitcoin reaching $143,000–$150,000 in 2026, driven by ETF flows and favourable regulation.
Fidelity’s Director of Global Macro projects a more cautious 2026, with price support between $65,000 and $75,000.
Analyst consensus targets a range of $96,000–$145,000 in a fully bullish scenario by Q4 2026.

The honest framing: Bitcoin regularly experiences 50–80% drawdowns. The 2022 cycle saw Bitcoin fall from ~$69,000 to ~$16,000, a loss of over 77%. In 2025, it fell from $126,000 to lows near $80,000 in a matter of months. Bitcoin should be viewed as a high-risk, high-variance asset, not a capital-preservation vehicle.

That does not make it a bad investment for people who understand what they’re holding. It makes it the wrong investment for people who don’t.

How to Actually Buy, Store, and Use Bitcoin in 2026

The original post didn’t cover this. It matters.

To buy Bitcoin: The most straightforward options for most people are regulated exchanges — Coinbase, Kraken, and Gemini in the U.S.; platform-specific options vary by country. Alternatively, through a regulated Bitcoin ETF in a brokerage account (IBIT, FBTC, and others), which removes custody complexity but adds management fees and means you don’t hold Bitcoin directly.

To store Bitcoin: You can leave it on an exchange (convenient but exposes you to exchange risk — the 2022 FTX collapse is the relevant cautionary example), or hold it in self-custody via a hardware wallet like Ledger or Trezor (more secure, but the private key is entirely your responsibility). There is no recovery option if you lose your private key without a backup.

To use Bitcoin: For payments, Lightning Network wallets (Strike, Phoenix, Wallet of Satoshi) enable fast, cheap Bitcoin payments anywhere Lightning is accepted. For cross-border remittances, Bitcoin via Lightning is now one of the most cost-effective options available for many corridors — particularly relevant in countries where traditional remittance fees remain high.

The Honest Assessment for 2026

Bitcoin in 2026 is no longer speculative in the same way it was in 2022. The spot ETF approval converted Bitcoin from a self-custody-only asset into something pensions, RIAs, and corporate treasuries can hold through a regulated brokerage line — which is why BTC held above $100,000 instead of round-tripping like prior cycles.

It is still volatile. It still carries regulatory risk. It still lacks an intrinsic valuation model that commands consensus. And its environmental footprint, while improving, remains a live issue.

What has changed is the risk-adjusted probability that Bitcoin simply disappears or becomes irrelevant — the outcome that justified the most dismissive responses to the original post in 2022. That outcome now looks vanishingly unlikely given the depth of institutional infrastructure, the regulatory progress, and the supply dynamics described above.

Whether Bitcoin belongs in your portfolio at any given price is a question that depends on your risk tolerance, time horizon, and position sizing — not on whether Bitcoin “works.” At this point, it works. The open question is what it’s worth.

Have questions about Bitcoin or digital asset strategy? Get in touch.