Blockchain has long been used for more than just bitcoin, but there have been far more splashy announcements than working systems. In this lesson, we'll look at where the technology has really taken hold, which projects shut down, and why. With a handful of questions, you'll learn to judge for yourself whether a blockchain actually adds something or an ordinary database would do the job.
- Blockchain is useful where several parties don't trust each other and no one owns the shared data.
- It has taken hold most firmly in money: stablecoins, transfers and asset tokenization.
- Logistics and registries have success stories, but also high-profile shutdowns.
- A blockchain guarantees that a record can't be changed, not that what went into it is true.
When you really need a blockchain
In the second half of the 2010s, "blockchain" got stuffed into pitch decks left and right, whether the project was a hotel or a coffee shop. Very little of it ever became a working product. The reason is simple: a distributed ledger is slower and more expensive than an ordinary database, and those costs are only worth paying when there's no other way.
The technology pays off when several parties use the same data but aren't willing to hand control of it to any one of them. A bank won't keep its records on a competitor's server, a supplier doesn't trust the carrier, and a citizen doesn't want to depend on an official who could quietly change a record. But if the data has a single owner everyone trusts, an ordinary database will do a better job.
There's a second scenario, too: when the record itself is the thing of value that needs to change hands. A coin, a fund token or an in-game item exists only as an entry in a ledger, and a blockchain lets you transfer it directly, without going through the company that keeps the books. That's why the most successful examples involve money and digital assets rather than storing ordinary data.
Don't take the next "blockchain project" at its word: run it through the questions below. If the answer to most of them is "no", the blockchain is probably there for marketing. You'll find a closer look at the technology's strengths and weaknesses in the lesson on the pros and cons of blockchain.
- Are the records kept by several independent organizations or people?
- Do the participants distrust each other or a single middleman?
- Does it matter that the history of records can't be quietly rewritten?
- Is there value in any participant being able to verify the data?
- Is the project willing to accept slower, more expensive writes in exchange for these properties?
Ask yourself what would change if you replaced the blockchain with a spreadsheet on the company's server. If the answer is "nothing", the project doesn't need a blockchain.
Money and finance: where the technology took hold most
The most widespread use of blockchain is cryptocurrency itself, along with stablecoins. Every day, USDT and USDC are used to settle payments between exchanges, send money across borders and hold savings in dollars where access to foreign currency is restricted. A stablecoin transfer takes minutes on any day of the week, while an international bank payment can drag on for several days.
But stablecoins have a flip side. USDT and USDC are issued by companies that hold the reserves backing them, and those companies can freeze the funds at a specific address if the authorities demand it. So this isn't purely decentralized money. It's more like a digital version of the dollar with a clearly identifiable owner. That's convenient for payments, but you have to trust the issuer, not just the code.
The second area is the tokenization of real-world assets: issuing tokens that represent bonds, fund shares or real estate. Big asset managers have moved past talking about it. In 2024, for example, BlackRock launched its tokenized fund BUIDL on Ethereum. These tokens settle around the clock, and ownership is visible right on the blockchain.
The third is decentralized finance (DeFi), where lending, swaps and yield run on smart contracts with no bank involved. We cover this in detail in the lessons on decentralized apps and DeFi. For now, just take away the key point: in finance, blockchain solves a real problem by letting strangers transact with each other without a shared middleman.
Logistics and product authenticity
A supply chain involves a farmer, a warehouse, a carrier, customs and a store, and each of them keeps its own records. A shared ledger makes it quick to answer the question "where did this shipment come from?" In a well-known experiment by Walmart and IBM, the time needed to trace a batch of mangoes back to the farm dropped from several days to a few seconds.
Gemstone tracking systems work in a similar way. Tracr, a platform created by De Beers, records a diamond's journey from the mine to the point of sale so the buyer can verify where it came from. In pharmaceuticals, blockchain is being tested to track medicine packages and fight counterfeits.
The principle is the same everywhere. Each participant in the chain adds its own record and signs it with its own key, and nobody can quietly change that record later. If a shipment spoils, it's easy to find the stage where it happened and who was responsible for the goods at that point.
But there have been high-profile failures too. TradeLens, the platform IBM and Maersk built for container shipping, was shut down in 2023 because other major carriers didn't want to join a competitor's system. The technology worked, but without the whole industry on board, a shared ledger loses its point.
A blockchain guarantees that a record won't be changed after the fact, but it doesn't check whether the record is true. If a warehouse enters the wrong information about a shipment, the blockchain will store it flawlessly.
Registries, documents and digital identity
Governments have also tried moving land registries onto a blockchain. Back in 2016, Georgia teamed up with Bitfury to start recording hashes of property title documents on a blockchain so that forgeries would be easy to spot. Estonia uses similar technology to protect the integrity of its government databases: any tampering leaves a trace that can't be hidden.
In education, blockchain is used for diplomas and certificates. MIT was one of the first universities to issue digital diplomas to its graduates using the open Blockcerts standard. An employer can check that a diploma is genuine on their own, without contacting the university.
So why haven't registries moved to the blockchain completely? Because ownership is defined by law, not by an entry on a network. If a court rules a deal invalid, the record has to be changed, and a blockchain is designed to make changes impossible. That's why governments see it as an extra layer of protection against forgery, not a replacement for the existing system.
Notice what these cases have in common: what goes on the blockchain usually isn't the document itself but its hash, a kind of digital fingerprint. Personal data stays in a closed system, and the public network only stores proof that the document existed and hasn't been altered.
Games, tickets and digital ownership
In games, blockchain lets you truly own an item: you can sell a sword or a skin to another player outside the developer's platform. These items are usually issued as NFTs. It sounds tempting, but most games built around earning money from items lost their players once token prices crashed.
NFT tickets for sporting events and concerts help fight counterfeits and give organizers control over resale. Artists and musicians use tokens to earn a percentage every time their work is resold, although not every marketplace supports this.
So what does all this mean if you're taking a closer look at crypto? If a network is actually being used for transfers, trades and fee payments, its token has more to stand on in the long run than a token backed only by promises. If a project promises uses in logistics or medicine, check whether it has real, paying customers, not just memorandums of understanding and a pretty roadmap.
The summary table below shows where the technology has delivered and what's holding it back. Keep it in mind the next time you read a news story about a "blockchain revolution".
| Area | What blockchain offers | Main limitation |
|---|---|---|
| Payments and stablecoins | Fast transfers without intermediary banks | Issuer risk and regulation |
| Asset tokenization | Round-the-clock settlement, transparent ownership | Legal status of tokens |
| Logistics | A shared shipment history for all participants | The whole industry has to join |
| Registries and diplomas | Protection against backdated forgery | People still enter the input data |
| Games and tickets | Owning an item outside the platform | Interest lasts only while prices rise |
See a headline like "Company X adopts blockchain"? Look in the article for who else is part of the system and what changed for the customer. If there are no answers, you're most likely looking at a pilot project or a press release.
Find any news item along the lines of "Company X adopts blockchain" and run it through the five questions from the section "When you really need a blockchain". Separately, answer: who else is part of the system, and what would change if the blockchain were replaced with a spreadsheet on the company's server? If the article gives no clear answers, you're most likely looking at a pilot or a press release, not a working system.
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FAQ
Do banks use blockchain?
Yes, but more often as private networks for interbank settlements and experiments with tokenization. Major financial companies are also trying public blockchains, for example for tokenized funds.
Why did so many blockchain projects shut down?
Often the problem wasn't the technology but the fact that a shared ledger only makes sense when every side of the market takes part. Other projects used blockchain where an ordinary database would have been enough, and lost to it on speed and cost.
Can you vote in elections via blockchain?
Pilots have been run in various countries, but this kind of voting hasn't caught on at scale. Security experts point out that the weakest links are voters' devices and identity verification, not the ledger itself.
Do I need to understand blockchain use cases to trade crypto?
You don't need to go deep, but it helps you tell projects with real demand from those living on promises. This perspective will come in handy in the section on fundamental analysis.
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