Beginners Guide to Cryptocurrency

Gone are the days when you had to carry a physical wallet stuffed with cash. Today, digital payments via mobile apps are the norm, and cryptocurrency has emerged as a prominent alternative to traditional fiat currencies. Nowadays, cryptocurrencies are increasingly accepted and regulated in many countries, with nations like El Salvador adopting Bitcoin as legal tender and major economies like the US and India leading global adoption. While regulatory frameworks such as the US GENIUS Act for stablecoins and ongoing international standards from bodies like the Financial Stability Board continue to evolve, cryptocurrencies are poised to become even more integrated into the financial system. In this article, we’ll explore what cryptocurrency is, its basic properties, and key developments.

Peer to Peer Electronic Cash System

Cryptocurrency is not an isolated invention, it stems from a radical innovation of Satoshi Nakamoto. He first invented the Bitcoin, one of the most popular cryptocurrencies at this point of time. It was not his intention to create a new currency. He simply wanted to develop a peer-to-peer electronic cash system where double spending of the same money would be impossible. It needs a system with no server or central authority and completely decentralized.

Note: Satoshi Nakamoto’s true identity remains unknown (whether an individual or a group) and there’s no concrete evidence to confirm it.

In order to use money digitally, it is important to have a payment network with balances, accounts and transactions. A major problem that current payment networks have is the avoidance of double spending. Currently, a server or central authority such as bank does this and monitors the balance sheets.

In a decentralized network such as the Bitcoin, a server or authority does not exist and therefore each participant must take on this task. Each ‘peer’ (participant) in the network has a list of all transactions that are made and checks whether the future transactions are valid or are an attempt to double spend. If the peers of the network can not agree on a balance, then the whole transaction will not take place, even if it concerns a small detail. There must be absolute agreement for a transaction to happen.

Note: Other cryptocurrencies, like Ethereum (which transitioned to Proof-of-Stake in 2022), use validators who stake coins for consensus, reducing energy use while maintaining security.

Approval and Miners

Here is how a transaction will happen in the peer to peer system. Peer 1 gives an x number of Bitcoin to peer 2. This transaction is signed by peer1’s private key. After signing the transaction, it is included in the peer-to-peer network. The entire network knows almost immediately that the transaction was made, but it takes a while before it is actually approved / confirmed. The approval is the most important part and it can be said that cryptocurrency is all about approval. As long as this is not the case, the transaction will always remain pending. Once an agreement has been given, it will be included in the overview of historical transactions and can not be reversed. We also call this overview of historical transactions as the blockchain.

Only miners can approve transactions. This is their task within the cryptocurrency network. They deal with transactions, label them as legitimate and distribute them in the network. After the approval each node will add it to its database as it has become part of the blockchain. Every computer that is connected to the network is called a node. The miner receives a reward in the form of a token / proof of the cryptocurrency for his task.

Cryptocurrency Properties

The name cryptocurrency is used because the use of cryptography in the entire process for strong protection. It is not protected by people, but by pure mathematics. Therefore, the chances of affecting a Bitcoin transaction is remote. In order to understand things better, we can classify the properties of cryptocurrency into transaction and monetary properties.

Transaction Properties

1. Irreversible

Unlike traditional currency transactions that you can cancel after completion, you can’t cancel or return a cryptocurrency transaction after the approval. Therefore, you should check the address with at most care before sending a cryptocurrency payment. It is also important to protect your wallet against hackers. There will be no option to get the money if a hacker transferred your money to his / her account.

2. Pseudonym

It is important to understand both transactions and accounts in cryptocurrency world are not related to any identity of a company or person. You will receive coins at your own randomly assigned address consisting about 30 characters. It is thus possible to analyze the transactions of addresses back and forth, but it is not possible to see between which identities they are made.

3. Fast and Global

You may need to wait for many days to complete an international bank transaction. However, all crypto transactions are immediately included in the network and within few minutes after the approval. Since it is included in a global network of computers, no one is aware of where the transaction comes from the world. It does not matter in terms of speed whether you send a coin to your local city or to an international location.

4. Safety and Permission

A public key cryptography system holds every cryptocurrency transaction. However, only the owner of the coin owns a private key and can receive or send coins. This makes the cryptocurrency transactions safer than traditional currency exchanges. In addition to safety, you do not need anyone’s permission to use cryptocurrency. There is no authority that prevents you from using cryptocurrency.

Monetary Properties – Controlled Supply

Many cryptocurrencies have capped supplies to mimic scarcity, like gold. Bitcoin’s issuance halves every four years (last in 2024), with the final coin expected around 2140. Schedules are coded in, allowing predictable future supply estimates. However, not all follow this, stablecoins like Tether maintain value pegged to fiat.

Cryptocurrency System Criteria

Putting all the above properties together, a cryptocurrency system should meet the following criteria:

• Operate without a central authority.
• Track every unit’s ownership cryptographically.
• Allow new coin issuance (if applicable) with assigned ownership.
• Process ownership changes via transactions.
• Resolve conflicts by executing only one of conflicting instructions.

Popular Cryptocurrencies

With the market cap exceeding $3.7 trillion (as of October 2025) and Bitcoin hitting all-time highs around $126,000 amid a bull run, here are some top cryptocurrencies by market capitalization:

These dominate due to factors like Bitcoin’s store-of-value role, Ethereum’s smart contracts, Solana’s speed, and stablecoins’ utility in trading.

Final Words

Since Bitcoin’s 2009 debut, thousands of cryptocurrencies have emerged, driving innovation in finance. Recent years, adoption surges with institutional involvement, Bitcoin ETFs, AI-integrated trading, and tokenized assets. While volatility persists, cryptocurrencies are reshaping the financial world, potentially coexisting with or complementing traditional systems in the years ahead.