Bitcoin Basics From Zero to What Is It?

Lehman Brothers collapsed on a Monday in September 2008. By Tuesday morning, ordinary Europeans found their savings frozen, mortgages in question, pension funds gutted. They had done nothing wrong. They had trusted institutions that lied. One month later a person calling themselves Satoshi Nakamoto published nine pages proposing money that needed no bank at all.

That paper was the Bitcoin whitepaper. You can think Bitcoin is the future of money or a bubble waiting to pop, but understanding how it works is now part of basic financial literacy in Switzerland. This book teaches it from zero.

What is Bitcoin?

Bitcoin is the first decentralized digital currency.

It lives as data on a global public ledger called the blockchain. No authority issues it, controls it, or shuts it down. Anyone with an internet connection can use it, provided they follow the same open rules written into the software.

That makes Bitcoin different from every form of money that came before.

When you hold euros in a bank account, you hold a promise. The bank owes you euros. If the bank fails, that promise breaks under terms you never agreed to. Credit Suisse AT1 bondholders learned this in 2023 when CHF 16 billion was wiped out overnight. (Depositors were made whole when UBS absorbed the bank. Bondholders and shareholders ate the loss.)

When you hold Bitcoin in a wallet you control, you can authorize payments with your private keys without a custodian's permission. Keeping that control depends on secure key generation, working software, and recoverable backups.

Who Invented Bitcoin and Why?

In October 2008, someone using the name Satoshi Nakamoto published the Bitcoin Whitepaper, titled "Bitcoin: A Peer-to-Peer Electronic Cash System."

The problem statement was specific:

• Banks can freeze or reverse payments at will.
• Governments inflate money by printing more of it, eroding what savers already hold.
• Sending money across borders runs through correspondent banks, currency desks, and clearing houses, each taking a cut and adding days.

Bitcoin was the proposed answer: a peer-to-peer money system where math and a decentralized network verify transactions instead of an institution.

Nakamoto shipped the first software in January 2009 and mined the first block (the genesis block) on January 3rd. They embedded a message in it: "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks." That was the newspaper headline that morning, and Nakamoto picked it on purpose. The note told you exactly what Bitcoin was a response to.

Satoshi disappeared from the project in 2010 and handed control to the developer community. Nobody has proven who Nakamoto was. Their coins, roughly 1 million BTC, have never moved.

Why is Bitcoin Valuable?

If Bitcoin is just data, why does it cost anything?

Because of a stack of properties that no asset before it has held together:

Scarcity. The supply is hard-capped at 21 million coins. No board votes change this; the rule lives in the protocol. As of September 13, 2026, roughly 20.08 million Bitcoin have been issued, according to Blockchain.com network data. About 0.92 million remain under the current issuance schedule, which runs to around 2140.

Security. Real-world computational work, called proof of work, makes rewriting confirmed transaction history costly. Miners compete for blocks, and nodes check that blocks follow the rules. This network protection does not protect a weak wallet key or a stolen backup.

Neutrality. Bitcoin does not check where you live, your credit score, or whether your government likes what you are buying. A small business owner in Zurich and a market trader in rural Nigeria face the same rules.

Verifiability. Every transaction in history is public. Anyone can download the full blockchain and audit it. No hidden accounts, no off-balance-sheet positions, no creative accounting. You can verify the supply yourself.

Economists treat Bitcoin more like a scarce commodity than a currency. The supply behaves a bit like gold (gold has industrial uses; Bitcoin does not), but the scarcity is mathematical and enforced by code rather than geology.

How Many Bitcoins Exist and What Happens to Supply Over Time?

The supply schedule explains why people hold Bitcoin as a long-term store of value.

Hard cap under Bitcoin’s current consensus rules: 21 million coins. Nodes enforcing those rules reject blocks that issue too much. Changing the limit would require adoption of different rules; it cannot be imposed on existing nodes by one issuer.

Supply snapshot (September 13, 2026): roughly 20.08 million Bitcoin issued.

Remaining: about 0.92 million coins left to issue under the current schedule.

Timeline: the last Bitcoin gets mined around 2140.

New coins enter circulation through mining. Miners who add a valid block earn newly created Bitcoin. That reward halves every 210,000 blocks, roughly every four years, in what people call "the halving." In 2009, miners received 50 BTC per block. After the fourth halving in April 2024, the reward dropped to 3.125 BTC. The next halving lands around April 2028.

New supply keeps shrinking while demand has trended up. Many holders treat Bitcoin as a savings asset for that reason. Price moves around violently in the short term, but the supply side is fixed in a way no fiat currency matches.

What is a Satoshi?

A full Bitcoin trades at tens of thousands of francs, so beginners assume Bitcoin is only for the wealthy. It is not.

Bitcoin breaks down into tiny units called satoshis (often shortened to sats):

1 Bitcoin = 100,000,000 satoshis

Think euros and cents. One euro splits into 100 cents. One Bitcoin splits into 100 million sats.

A Kraken BTC/CHF trade at 15:29 UTC on September 13, 2026 was CHF 62,877.80 per Bitcoin. Rounded to CHF 62,900 for this example, one satoshi is worth about CHF 0.000629, or 0.063 centimes. This is a dated market snapshot, not a fixed conversion rate. Small Lightning payments can use a few hundred sats; on-chain fees and minimum-output policies affect what is practical.

This matters practically. You do not need to buy a whole Bitcoin to participate. You can buy CHF 50 worth. You can receive CHF 2 worth of sats for a coffee. The divisibility makes Bitcoin usable at any scale.

How Do I Buy Bitcoin Safely?

Before buying, choose a platform and custody setup you understand and can maintain. Security checks belong before the first deposit.

Stick to regulated exchanges. In Switzerland and the EU, regulated crypto exchanges must comply with anti-money laundering and know-your-customer rules. The KYC step feels intrusive, but it means the company carries real legal duties toward you. Kraken, Coinbase, and Bitstamp operate in Switzerland, alongside Swiss-domiciled providers regulated under the Anti-Money-Laundering Act through a FINMA-recognised self-regulatory organisation. Check the FINMA SRO member register and confirm your exchange holds a current licence before you deposit.

Enable two-factor authentication. Every crypto account needs a second verification step beyond the password. Use an app-based authenticator like Google Authenticator or Authy. SMS gets intercepted through SIM-swap attacks.

Choose custody deliberately. An exchange can be hacked, fail, or freeze withdrawals. Self-custody removes that custodian's control over your coins, but makes you responsible for the wallet, backups, maintenance, and physical security. Learn the recovery process and test with a small amount before moving substantial funds. Chapter 6 covers wallets; chapter 9 compares self-custody, managed custody, and exchange-traded exposure.

Avoid the obvious red flags. Random sellers on Telegram. "Investment opportunities" promising guaranteed returns. Platforms only recommended by someone you met online. Anyone asking you to send Bitcoin to a wallet they provide. These are scams. They work because they look professional enough to trick someone in a hurry.

Can I Lose My Bitcoin?

Yes, and you need to understand this before you buy.

Bitcoin's consensus rules, the software implementing them, and the wallets holding keys are different security layers. Serious software defects are possible: Bitcoin Core's 2018 security disclosure documented and patched a critical inflation vulnerability. A wallet can also lose funds while the network continues to follow its rules.

Lost private keys or recovery information. Many wallets give you a seed phrase: 12 or 24 words used to recover your keys. Others use a different backup method, as chapter 6 explains. Lose access to the wallet and all its recovery information, and the coins may be permanently out of reach.

Wallet defects. Coinkite's July 2026 Coldcard advisory describes weak seed generation that allowed attackers to reconstruct keys offline. Careful storage alone could not fix an affected seed. Chapter 6 explains the current migration guidance and why a firmware update alone is insufficient.

Sending to the wrong address. Bitcoin addresses include a checksum that helps wallets detect typing errors and reject malformed addresses before sending. It does not tell you whether a valid address belongs to your intended recipient. Paste a scammer's valid address and the payment can still go through. Once confirmed, you cannot reverse it yourself. Check the full destination address before approving a payment.

Exchange failures. Keeping Bitcoin on an exchange means trusting the exchange. When FTX collapsed in 2022, customers lost billions in assets they believed were segregated. Thousands of European investors were directly affected.

Phishing and fake apps. Someone types their seed phrase into a fake website, or installs a wallet app from a copycat. The wallet drains within seconds. Chapter 13 covers the playbook in detail.

The lesson: holding your keys changes which risks you carry. It removes a custodian's ability to withhold your coins, but firmware defects, compromised devices, lost recovery material, and physical coercion remain possible. Loss is not proof that the owner was careless.

Risk Note

Bitcoin is volatile. In 2022 the price fell from roughly USD 67,000 to below USD 17,000, a drawdown of more than 74%, before recovering. In March 2020 it lost over 50% in a single week during the Covid panic and went on to set new all-time highs within months.

That volatility is real. It should shape how much of your savings you put into Bitcoin and how you think about timing. Nobody can predict short-term price moves. Anyone who claims they can is guessing or selling.

Regulation varies across Europe. Switzerland treats Bitcoin as a digital asset, subject to wealth tax on holdings. Gains may count as taxable income if your activity looks like trading rather than holding; ask a Swiss tax adviser if you trade actively. EU crypto-service regulation and tax reporting are separate matters; chapter 19 distinguishes DAC8 reporting from Switzerland’s CARF timetable. Owning Bitcoin means owning the responsibility to know how it is taxed where you live.

Reader Takeaway

• Bitcoin is money built on mathematical rules rather than institutional trust, and the difference matters.
• The current consensus rules cap supply at 21 million coins. Roughly 20.08 million had been issued by September 13, 2026.
• One Bitcoin equals 100 million satoshis. You can buy and use very small amounts.
• Before buying, check the provider, enable strong two-factor authentication, and choose custody you can maintain and recover.
• Network security and wallet security are different. Good habits reduce risk; they do not rule out software defects or theft.

Chapter Summary

• Bitcoin is the first decentralized digital currency, launched in 2009 as a response to the 2008 financial crisis.
• No government, bank, or company controls Bitcoin. Mathematics and a global network of computers enforce the rules.
• The current issuance schedule caps supply at 21 million coins. Roughly 20.08 million had been issued by September 13, 2026; the remainder is scheduled over the years to around 2140.
• A Bitcoin divides into 100 million satoshis (sats), so payments at any size are practical.
• Safer buying requires provider checks, strong security, and a deliberate custody and recovery plan.
• Bitcoin is volatile and regulatory treatment varies by country. Understand both before committing serious money.

References

• Nakamoto, S. (2008). Bitcoin: A Peer-to-Peer Electronic Cash System. bitcoin.org
• Blockchain.com. Total Bitcoin Supply Data
• BIS Papers on digital currencies: BIS Working Papers 101
• Yermack, D. (2013). Is Bitcoin a Real Currency? An Economic Appraisal. NBER.
• Swiss Federal Tax Administration: guidance on cryptocurrency taxation
• European Securities and Markets Authority (ESMA): MiCA regulation overview
• BIP 173: Bech32 address checksums