What is the Blockchain? A Beginner's Guide

What is the Blockchain? How it Works and How Businesses Can Use It

Some business owners just think of the blockchain as “the thing crypto moves on”. While they’re on the right track, the reality is that blockchain technology can facilitate lots of different processes in industries from healthcare to finance. When a client offers to pay an invoice in stablecoins, or when a supplier mentions that their shipment can be tracked on-chain, you might be lost if you don’t understand how the blockchain works.

In this article, we’ll examine how the blockchain actually works, the ways businesses use it, and where it's beginning to show up in modern banking. Later on, we’ll also take a look at Slash, a business banking platform that comes with built-in crypto on/off ramps so you can send stablecoins from the same place you manage the rest of your finances.¹,⁴

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Key Terms Explained

Before we break down blockchain technology in detail, let’s take a look at some key words and phrases you should be familiar with:

Digital ledger: A digital record of transactions, similar to a paper ledger that records money going in and out. The digital version, in contrast, is maintained by a series of computers rather than a single bookkeeper.
Node: One of the computers maintaining that record. A network can have thousands of them, each holding a full copy of the ledger.
Smart contract: Self-executing contracts that automatically enforce agreements when predetermined conditions are met, such as terms agreed upon by buyers and sellers. This means human intervention and third-party verification aren’t required.
Cryptocurrency: A form of digital currency that can be used for both electronic payments and as a store of value.
Stablecoins: Virtual tokens designed to maintain price stability, usually by being linked to an underlying fiat currency. The two most popular stablecoins in use today are USDC and USDT, which are both pegged 1:1 to the U.S. dollar.
Crypto wallet: A piece of software holding the keys that prove you own assets on a blockchain. It actually doesn't store the assets themselves, as those live on the network.
Decentralization: When a distributed group manages a workflow rather than a single company or authority. In a decentralized setup, nobody can independently change the rules or reverse a transaction.

Understanding Blockchain Technology

A blockchain is a shared record of transactions that no single party controls. Rather than one bank keeping the definitive ledger, thousands of computers each keep an identical copy. They agree on what's true through a defined process without relying on a central authority.

Transactions get grouped into blocks, and each new block carries a cryptographic reference to the one before it, forming a chain. Thus, it’s called the blockchain. The links between each block essentially make the record tamper-resistant, since altering an old transaction would change its block and break every reference that follows.

This means that participants who don't know or trust each other can still agree on a shared set of facts. Traditionally, the job of confirming an action like a cleared payment would belong to an intermediary such as a bank or a registry. A blockchain replaces that middleman with math and a transparent record.

Every transaction made on the blockchain is permanent, which protects records from being altered after the fact. That also means a mistake can't be undone, and there’s no customer support number to call if something goes wrong. Blockchain transactions are also public, so you and any other party can inspect its history and execute a quick, clean audit.

How many blockchains are there?

There are over 1,000 different blockchains in operation today, coming in four forms:

Public: A permissionless, non-restrictive network that’s open to the public
Private: A system that’s only available within a closed network, often operated by a single organization
Hybrid: A combination of the two, where admins get to decide what data should be public and private
Consortium: A semi-decentralized setup where multiple organizations manage a blockchain together

If you’re entering the world of digital assets for the first time, you’ll typically only work with large, public blockchains like Ethereum, Solana, and Tron, which have a combined $400 billion market cap. Slash users can send stablecoins via eight supported public blockchains, including those three.

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What Can the Blockchain Be Used For?

Blockchain technology best suits situations where several parties need to agree on a digital record and none of them fully trust the others to keep it. Here are the four most common places you’ll see these networks utilized:

Cryptocurrency

Crypto was the blockchain’s original use case, and it’s still one of the largest. Tokens like Bitcoin were designed so two people could exchange value directly without a bank confirming the transfer, which wouldn’t be possible without blockchain technology.

In recent years, stablecoins have emerged as a closer analogue to traditional payments, especially in business settings. Because dollar-pegged coins hold their value more consistently, they’re often used to pay overseas contractors and settle supplier invoices. While international wires take several days, stablecoins transfers often only take several minutes. According to McKinsey,$390 billion in stablecoins were transacted in 2025, most of which took place between businesses.

Supply Chains

Supply chains involve manufacturers, shippers, distributors, and retailers who each keep their own records relating to their specific operations. When something goes wrong, reconciling those records can be a pain in the neck.

When you use the blockchain to record each step on a shared ledger, everyone can see the same history and nobody can edit it afterwards. Today’s food companies use this technology to trace a contaminated batch back to its source in minutes rather than days, which matters enormously during a recall. Luxury brands also use it to fight counterfeiting by assigning each item a digital identity. A buyer can then verify the legitimacy of that identity by scanning a code with their phone.

Healthcare

Healthcare deals with a similar problem. When patient records are spread across providers, insurers, and systems that don't talk to each other, it can be very difficult to agree on a record and prove it hasn't been altered.

Blockchains can help prove the integrity of these records, since a tamper-evident log can show exactly when a record was created and whether it changed. Pharmaceutical companies can also track a drug from manufacturer to pharmacy, which helps follow traceability requirements found in regulations like the Drug Supply Chain Security Act (DSCSA).

Decentralized Finance

Decentralized finance (DeFi) refers to financial services that run on a blockchain rather than through banking providers. Actions like lending, borrowing, trading, and earning yield all happen through smart contracts that execute automatically, without the need for a bank to approve anything.

As an example, let’s look at a lending protocol. Instead of applying for a loan and waiting on underwriting, you deposit crypto as collateral and borrow against it immediately. The smart contract handles everything, including tracking your position and selling your collateral automatically if its value falls too far.

Overall, the appeal is access and speed. Anyone with a wallet can use these services regardless of their location, credit history, or banking relationships. Everything also settles in minutes at any hour, which is a far cry from traditional payment rails that adhere to strict hours. The downside of these transfers can be their irreversibility, which ends up being extremely costly in certain situations. If you try sending crypto to another party through an incorrect or unsupported rail, your tokens will likely disappear permanently. For this reason, you should thoroughly doublecheck transaction details and requests with your recipient before sending crypto. You may also want to send a small test transaction, especially if you’re about to transfer a large sum.

How Slash Brings the Blockchain to Business Banking

As helpful as DeFi and blockchain technology can be, fully adopting it is a big undertaking for most businesses. Financial platforms like Slash allow you to send and receive stablecoins without having to overhaul your workflows or abandon conventional banking tools.

With Slash, you can send suppliers and vendors funds via SWIFT, ACH, virtual card, RTP/FedNow, and cryptocurrency. With built-in on/off ramps, you can convert your USDC and USDT to your local currency on the spot without having to manage a digital wallet or safeguard keys. If your customers are crypto-native, Slash even lets you generate invoices with links that accept stablecoin payments. Regardless of the rail you use, all transactions can be tracked and sorted in real time on our dashboard alongside your company card spend, treasury balance, working capital financing, and more.⁵,⁶

Bring the convenience and speed of stablecoin payments into the same place you manage the rest of your business’s finances. To learn more, reach out to Slash today.

Key Takeaways

A blockchain is a shared transaction record maintained by many computers at once, which lets parties who don't trust each other agree on the same set of facts without a middleman.
Transactions are permanent and usually public, which protects records from tampering. However, it also means a mistake can't be reversed.
Stablecoins are particularly useful for actual business payments, since a $5,000 transfer is a lot less likely to fluctuate in value when it’s sent in USDC rather than Bitcoin.
Supply chain and healthcare teams can use the blockchain to prove a record hasn't been altered.
There are over 1,000 different blockchains in use today, but unless you work for an organization that has its own, you’ll mostly be using public ones.

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Frequently Asked Questions

Can a blockchain transaction be reversed?

Almost never. Once a transaction is confirmed, it becomes part of a permanent record, which is why sending funds to a wrong address usually results in losing them. That permanence is a good thing for anyone worried about records being altered, but it’s a risk for anyone moving money. For that reason, it’s a good idea to send a small test transaction first.

What’s the biggest blockchain?

Ethereum stands as the largest public blockchain, with a transaction volume exceeding $120 billion and a market cap of$300 million.

Does my business need to have a crypto wallet to use blockchain payments?

Not necessarily. Banking platforms like Slash convert at both ends with on/off ramps, so dollars leave your account, travel as stablecoins, and arrive as dollars for the recipient. You can get the settlement speed without managing a wallet, protecting a recovery phrase, or holding a special asset.