Learn / Lesson 5

What is Bitcoin?

Bitcoin is the first and most well-known cryptocurrency. It was created to let people send value directly to each other over the internet, without needing a bank or payment company in the middle.

If you have ever sent money to a relative abroad and watched the fees add up while the transfer took days to arrive, you already know one of the problems Bitcoin was designed to solve. It offers a way to move value across borders in minutes, at any hour, with no bank holiday or cut-off time.

Where Bitcoin came from

In October 2008, someone using the name Satoshi Nakamoto published a short technical paper — now called the Bitcoin "whitepaper" — that described how a peer-to-peer electronic cash system could work without a central authority. To this day, nobody knows for certain who Satoshi Nakamoto really is. It could be one person or a group.

On 3 January 2009, the Bitcoin network went live when Satoshi mined the very first block, known as the genesis block (or Block 0). Embedded in that block was a newspaper headline from that day's Times of London — a subtle comment on the banking system that Bitcoin was designed to work around.

Nine days later, on 12 January 2009, the first-ever Bitcoin transaction took place when Satoshi sent 10 BTC to computer scientist Hal Finney. At the time those coins had no market price at all. Today, 10 BTC would be worth hundreds of thousands of US dollars.

How Bitcoin works — the basics

Bitcoin runs on a public blockchain. Every transaction is recorded in a shared ledger that anyone can view. No bank, company, or government controls that ledger.

New transactions are verified through a process called proof of work (often called "mining"). Specialised computers compete to solve a complex maths puzzle. The first one to solve it earns the right to add a new block of transactions to the chain and receives freshly created bitcoin as a reward.

This process serves two purposes: it confirms that transactions are valid, and it puts new bitcoin into circulation in a predictable, transparent way.

The 21-million limit

One of Bitcoin's most important rules is that there will only ever be 21 million bitcoin. This limit is written into the software itself and cannot be changed without the agreement of the entire network.

New bitcoin enters circulation through block rewards, but those rewards are cut in half roughly every four years — an event called the halving. When Bitcoin launched in 2009, miners received 50 BTC per block. After the 2012 halving it dropped to 25, then 12.5 in 2016, 6.25 in 2020, and 3.125 after the April 2024 halving.

As of 2026, roughly 20 million bitcoin have already been mined — about 95 per cent of the total supply. The remaining coins will trickle out more and more slowly. The very last fraction of a bitcoin is not expected to be mined until around the year 2140.

This fixed supply is one reason people compare Bitcoin to gold. Just as there is a limited amount of gold in the earth, there is a limited amount of bitcoin that can ever exist. Supporters call it "digital gold." Critics point out that gold has thousands of years of history, while Bitcoin has been around for fewer than twenty.

How people use it

People around the world use Bitcoin for different reasons:

• Savings. Some people buy and hold bitcoin as a long-term store of value, hoping it will be worth more in the future.
• Remittances. Workers abroad can send money home faster and sometimes cheaper than traditional wire services — especially relevant in the Caribbean, where remittances make up a significant part of many households' income.
• Payments. A growing number of merchants around the world accept bitcoin for goods and services, though this is still uncommon in Trinidad and Tobago.
• Trading. Some people buy and sell bitcoin to try to profit from its price swings. This is risky and not the same as investing.

Bitcoin in the Caribbean

Across the Caribbean, interest in Bitcoin has grown steadily. In Trinidad and Tobago, the Central Bank and the Securities and Exchange Commission have issued warnings about the risks of cryptocurrency, reminding the public that virtual currencies do not have legal-tender status and, in their first joint warning in 2019, that they were not regulated.

That does not mean Bitcoin is illegal — it means there are currently limited consumer protections if something goes wrong. The Virtual Assets and Virtual Asset Service Providers Act, 2025 took effect on 23 December 2025 and puts the TTSEC in charge of businesses that deal in crypto. Until 31 December 2026, those activities are not allowed as a business unless the TTSEC has approved the business through its Regulatory Sandbox, a supervised trial. The TTSEC says the temporary ban does not cover individuals using virtual assets for personal transactions such as buying goods and services. The rules are still developing, so read our Trinidad and Tobago rules lesson and the TTSEC's own guidance before you act.

If you are a beginner in the Caribbean, the most important takeaway is: learn before you spend. That is exactly what this site is here to help you do.

Keep in mind

• Bitcoin's price can swing dramatically in a single day. It has dropped more than 50 per cent from its peak on multiple occasions.
• Owning bitcoin means taking responsibility for your own security. If you lose your private key or seed phrase, nobody can recover your funds.
• Bitcoin transactions are irreversible. Once sent, there is no "undo" button and no customer-service hotline.
• Bitcoin is not anonymous — it is pseudonymous. With enough analysis, transactions can sometimes be traced back to individuals.
• None of this is financial advice. Before buying any cryptocurrency, understand the risks and never invest money you cannot afford to lose.

Common mistakes beginners make

Thinking it is too late. Many people see the price history and assume they missed everything. Nobody knows what the price will do next. Buying because of fear of missing out is one of the most common ways beginners lose money.

Buying all at once with money they need. Bitcoin has fallen by half or more several times. If the money is meant for rent, school fees or an emergency, it does not belong there.

Keeping everything on an exchange without understanding the risk. When coins sit on an exchange, the exchange holds the keys. If it fails, is hacked or freezes withdrawals, you may not get them back. Several large exchanges have collapsed over the years.

Falling for "double your bitcoin" offers. Anyone who asks you to send bitcoin so they can send back more is running a scam. No real giveaway works this way, however famous the name attached to it.

Sharing the seed phrase. No genuine support agent, exchange or wallet company will ever ask for it.

Try it yourself

Look up the Bitcoin price history for the last five years on a reputable data site and note the highest and lowest points. Work out, with a calculator, how much a 1,000 TT dollar purchase would have lost at the worst point. Then ask yourself honestly whether you could have stayed calm. If that exercise makes you uneasy, that is useful information about how much risk suits you.

Also read the first page of the Bitcoin whitepaper. It is only nine pages, and the opening paragraph explains the problem Bitcoin set out to solve.

Key terms from this lesson

• Satoshi Nakamoto — the pseudonymous creator of Bitcoin.
• Genesis block — the very first block mined on the Bitcoin network (3 January 2009).
• Proof of work — the method by which miners verify transactions and earn new bitcoin.
• Halving — an event, roughly every four years, that cuts the block reward in half.
• 21 million — the maximum number of bitcoin that will ever exist.
• BTC — the ticker symbol for bitcoin.

Sources and credits

Dates and rules drawn from the Bitcoin whitepaper (bitcoin.org/bitcoin.pdf) and the project's published documentation, cross-checked against several independent news and reference sources. Local context: the Central Bank of Trinidad and Tobago's 2023 speech on crypto regulation. Law: TTSEC fact sheet on the 2025 Act. Education only, not financial advice.

Module quiz

3 questions. Tap an answer to see if you are right and why. Get 2 right to complete the module.

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