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What is Cryptocurrency?

Disclosure: Crypto is a high-risk asset class. This article is provided for informational purposes and does not constitute investment advice. By using this website, you agree to our terms and conditions. We may utilise affiliate links within our content, and receive commission. You can read more about our editorial policy here. Cryptocurrency is a digital asset that functions as money, represents value, or performs a utility function on a blockchain. In this guide, we’ll explore the question, “What is cryptocurrency?” We’ll also discuss blockchains, how cryptocurrencies work, cryptocurrency exchanges, and how to use cryptocurrency. Let’s get started with some background first.

2026-07-17

What Is a 51% Attack? Meaning, Cost, and Examples

A 51% attack happens when a single person or group controls over half of a blockchain network’s computing power. With this level of control, they can block transactions, reverse them, and even double-spend coins. It represents a big threat to the security and trust of decentralized systems. While larger networks like Bitcoin and Ethereum are better protected due to widespread mining power, smaller blockchains with fewer participants face a greater risk. Key Takeaways Both Proof-of-Work (PoW) and Proof-of-Stake (PoS) blockchains can be vulnerable to 51% attacks, but the attack method differs for each system. Successful 51% attacks enable attackers to reverse transactions and double-spend coins, which can damage trust in the network. The cost of a 51% attack varies widely; it’s generally too expensive on large networks but feasible on smaller or newer blockchains. Preventing 51% attacks often involves enhancing network decentralization, security protocols, and community participation. Real-world examples like the Bitcoin Gold and Ethereum Classic attacks illustrate the potential consequences for crypto prices and security.

2026-07-14

What Is a 51% Attack? Meaning, Cost, and Examples

What Is a Blockchain Explorer, and How Do You Use It?

A blockchain explorer is a tool that gives you a window into a blockchain’s activity. From tracking transactions to viewing blocks, wallet addresses, and network metrics, blockchain explorers make blockchain networks transparent and accessible. These explorers let you see exactly what’s happening on the blockchain — down to the second a transaction is confirmed.

2026-07-06

What Is a Blockchain Explorer, and How Do You Use It?

How to Buy Bitcoin in a Fidelity IRA: Real Fees, Custody, and Steps for 2026

To invest in bitcoin through a Fidelity IRA, first verify what your account can hold, how custody works, all fees, and where scams appear.

How to Invest in Bitcoin Through Fidelity: Real Fees, Real Rules, and What Happens After You Buy

To invest in bitcoin through Fidelity, first verify the product type, account access, fees, transfer rules, and security settings before placing any order.

How to Exchange Bitcoin for Litecoin Safely

To exchange bitcoin for litecoin, verify the BTC/LTC route, confirm the LTC address and network, run a small test, and watch for fake support scams.

How to Change Litecoin to Bitcoin Safely

To change Litecoin to Bitcoin, pick a service that supports both coins, verify the BTC address, and check the final BTC you will receive after fees.

How to Buy Bitcoin in a Fidelity IRA: Real Fees, Eligibility, and Steps (2026 Guide)

To buy bitcoin in a Fidelity IRA, first confirm account eligibility, product type, costs, and transfer rules before placing any order.