By Robbie Gould | 08/24/2026
Depending on who you ask, blockchain is either the backbone of a decentralized future or an overengineered technology chasing relevance.
Blockchain is not a universal upgrade to existing computer systems, however. Rather, blockchain is a specialized form of digital infrastructure.
It’s designed to solve specific problems regarding trust, transparency, and data integrity. However, it introduces new challenges in scalability, cost, and complexity.
What Is Blockchain and How Does It Work?
According to Investopedia®, blockchain is a shared digital record (or ledger) stored across a network of computers. This peer-to-peer network – made up of computers called nodes – maintains identical copies of the data.
Unlike traditional systems, where a central authority manages records, blockchain distributes that responsibility across the network. As a result, no single entity has full control.
When a transaction via blockchain occurs, it is:
- Grouped into a block
- Validated through a consensus mechanism, such as proof of work or proof of stake
- Added to a chain of previous blocks
Each block is linked with cryptography to the one before it to form a continuous, tamper-resistant record.
American Public University (APU) Science, Technology, Engineering, and Math (STEM) instructor Sean Worthington, who teaches blockchain courses, compares blockchain to a public village record where the transactions are visible to everyone. According to Worthington, blockchain is “the digital version of that village square… thousands of computers running the same software, each holding an identical copy of the spreadsheet.”
That shared visibility is what makes blockchain difficult to manipulate. Every participant sees the same data, and any attempt to change it would require agreement across the network.
This design introduces tradeoffs – meaning that as you solve some issues, other issues are created. Because every node (or every network) maintains a copy of the ledger or a shared transaction record, blockchain systems must increase their storage requirements over time.
At the same time, more issues arise. Because transactions must be validated across multiple nodes, confirmations take longer than in centralized systems. Blockchain is not optimized for speed – it is optimized for trust, verification, and secure transactions.
By contrast, traditional systems are optimized for performance. They process transactions quickly, handle large volumes of data, and operate with minimal latency. These characteristics make them ideal for most business applications.
Where Is Blockchain Used?
Blockchain applications extend beyond cryptocurrency, although digital assets like Bitcoin and Ethereum® remain the most well-known examples. At a structural level, blockchain is designed for environments where multiple parties need to share data but lack a central authority that they all trust.
According to International Business Machines Corporation (IBM®), blockchain has shown particular promise in financial services and banking, especially for cross-border payments. Traditional systems often rely on multiple intermediaries, which add time, cost, and complexity to transactions.
Blockchain simplifies this process. It enables direct, peer-to-peer transfers, reducing friction and improving efficiency.
According to Ethereum, another major application of blockchain involves smart contracts (self-executing programs), which automate agreements by applying predefined rules stored on the blockchain. These smart contracts are widely used in decentralized finance and other blockchain applications, allowing organizations to streamline workflows that would otherwise require manual oversight.
The use of blockchain has also been explored in supply chainsystems, where organizations attempt to improve transparency by tracking goods from origin to delivery.
While blockchain is promising in theory, its implementations have faced adoption barriers, including:
- Integration challenges
- High costs
- Compatibility issues between platforms
In business environments, blockchain solutions aim to bring these capabilities into business operations. However, adoption has been slower than expected due to concerns around scalability, governance, and the lack of standardization across systems.
For example, a company may invest in a blockchain platform. Later, it may find that the platform doesn’t integrate well with its existing software or with the systems used by its partners.
Worthington notes that if a problem can be solved with a traditional database, “You should use that instead.” Blockchain is most effective in narrow, well-defined scenarios rather than as a general-purpose solution.
Blockchain prioritizes transparency, decentralization, and immutability, while traditional systems prioritize efficiency, scalability, and centralized control.
Real-World Examples of Blockchain Successes and Failures
A useful way to understand blockchain is to look at where it has worked and where it hasn’t. Cryptocurrency remains the clearest example.
According to Bitcoin, it has operated continuously since 2009 as a decentralized digital asset. It has demonstrated that a distributed ledger can function at a global scale without a central authority.
Similarly, Ethereum has enabled an entire ecosystem of smart contracts and decentralized applications, demonstrating how blockchain can support programmable financial systems.
Coinbase® observes that stablecoins – another type of cryptocurrency designed to maintain a fixed value – have also emerged as a practical application, particularly in cross-border payments. By allowing users to move digital assets quickly and with fewer middlemen, these systems encounter less friction and address real inefficiencies in traditional banking infrastructure.
Many highly publicized blockchain initiatives have failed to deliver lasting impact. Supply chain platforms, once considered a major area of blockchain innovation, have struggled to gain traction.
Many companies found them difficult to adopt, hard to connect with existing systems, and unable to easily share data across different platforms. In many cases, organizations found that traditional databases provided similar functionality with far less complexity.
Blockchain-based voting systems and large-scale enterprise implementations have faced similar issues. These projects often encounter resistance due to security concerns, regulatory uncertainty, and the difficulty of replacing existing systems that already work efficiently.
Worthington points out that the gap between expectation and reality is significant, particularly when blockchain is applied outside of the situations where it makes sense. Clearly, blockchain succeeds when it solves a clearly defined problem involving trust, but it often fails when applied broadly without a strong justification.
What Are the Advantages of Blockchain?
Blockchain’s advantages come directly from its architecture. When applied in the right context, it can fundamentally reshape how systems handle trust, verification, and shared data. The challenge is figuring out what the “right context” is.
The advantages of blockchain include:
- Decentralization
- Transparency
- Security and data integrity
- Trustless systems
- Automation through smart contracts
Decentralization
Starknet® notes that a significant benefit of blockchain is decentralization, meaning that control is spread across many participants instead of being held by a single authority. By distributing control across a network, blockchain reduces reliance on central authorities and eliminates single points of failure. This feature can be particularly valuable in systems where centralized control introduces risk or limits access.
At the same time, decentralization is not absolute. While blockchain removes formal intermediaries, influence can still be concentrated among participants with significant computing resources.
Transparency
According to DefiPedia, blockchain systems provide a shared, visible record of transactions. This transparency improves accountability and supports fraud prevention, because irregular activity is easier to detect in an open system.
However, transparency introduces tradeoffs. In some industries, full visibility can conflict with privacy requirements, forcing organizations to balance openness with confidentiality.
Security and Data Integrity
Rapid Innovation explains that blockchain uses cryptography and encryption to secure data and ensure its integrity. Once a transaction is validated and added to the chain, altering it becomes extremely difficult.
Worthington describes it as “tamper resistance of the historical record.” In systems where maintaining a verifiable history is critical, this feature provides significant value.
Trustless Systems
According to Ethereum, blockchain enables trustless systems, where participants do not need to rely on trusting individuals or institutions. Instead, trust is built into the system through consensus mechanisms and transparent, overarching rules. This trust system reduces reliance on third parties and allows for more direct interactions between parties.
Automation Through Smart Contracts
Smart contracts allow organizations to automate processes by embedding logic directly into the blockchain, according to IBM. As a result, the contracts can execute automatically when the right conditions are met, reducing delays and administrative overhead.
However, this automation introduces risk. If a smart contract contains an error, it will perform exactly as it’s written, and the blockchain will permanently record the outcome.
What Are the Disadvantages of Blockchain?
Despite its advantages, blockchain introduces several challenges – often referred to as core blockchain challenges – that limit its practical applications. These disadvantages include:
- Scalability
- Energy consumption
- Cost
- Limited decentralization
- Regulatory and legal challenges
- Security limitations
- Privacy concerns
- Implementation complexity
Scalability
As Ethereum notes, blockchain networks often struggle with scalability because transactions must be validated across multiple nodes. This limitation leads to slower transaction speed, increased latency, and frequent network congestion. As a result, blockchain is a poor fit for high-volume, real-time applications.
Energy Consumption
Many blockchain networks rely on energy-intensive systems to keep the network secure and verify transactions. According to Britannica® Money, some proof-of-work blockchain networks require enormous amounts of electricity to operate. These systems use a process called mining, where computers compete to solve complex mathematical problems in order to validate transactions and add new blocks to the blockchain.
Mining takes a lot of computing power, which is why it uses so much energy. As Worthington puts it, it’s “guessing numbers really fast and burning electricity to do it.”
Cost
Blockchain systems can be expensive to operate, and those costs aren’t always obvious upfront. Transaction fees can fluctuate based on demand, according to Crypto APIs.
For instance, fees can spike quickly when networks get busy. The infrastructure needed to build and maintain these systems can be costly as well.
In a lot of cases, organizations end up paying more than they expected. For many real-world applications, those costs outweigh the benefits, especially when simpler, more efficient solutions can achieve the same result.
Limited Decentralization
Starknet notes that although blockchain is designed to be decentralized, its control often becomes concentrated among a small number of participants.
This control happens because running the network at scale requires significant computing power, resources, and technical expertise, which only a limited number of organizations can afford. Over time, these participants gain more influence over how transactions are validated and how the blockchain network operates.
Worthington explains that “Miners are the system administrators.” Decentralization of the bitcoin network exists on a spectrum rather than as a fixed state.
Regulatory and Legal Challenges
The U.S. Securities and Exchange Commission® notes that blockchain operates in a rapidly evolving regulatory environment. Governments are still determining how to address regulatory issues, taxation, and legal compliance for blockchain systems. This uncertainty can slow adoption and increase the risk for organizations.
Security Limitations
Blockchain can strengthen certain aspects of cybersecurity, particularly when it comes to protecting the integrity of data and preventing unauthorized changes. However, it doesn’t eliminate risk; it changes where that risk exists.
As the National Institute of Standards and Technology (NIST®) Cybersecurity Framework emphasizes, security risks often extend beyond the technology itself and include factors such as user behavior, access management, and implementation practices. Vulnerabilities still show up in places such as:
- Smart contracts
- Data exchanges
- Everyday user behavior
- Application design
- External systems
The blockchain may be tamper-resistant, but the surrounding ecosystem – including the platforms people use and how they manage their access – is not always as secure.
In practice, most security issues don’t come from the blockchain being broken, but from how it’s built on, used, or accessed.
Worthington notes that security depends on context. Organizations must still address issues related to implementation, access control, and system design.
Privacy Concerns
CoinTracker® notes that blockchain systems are pseudonymous, meaning transactions are tied to digital addresses rather than real names. While the pseudonymity might seem private at first, those digital addresses can often be traced back to individuals through patterns, exchanges, or external data. However, all transactions are publicly visible and permanently recorded, which creates long-term privacy challenges.
The same transparency that makes blockchain useful for verification and fraud detection also makes it difficult to keep information private. Once data is recorded, it can’t easily be removed or hidden, which conflicts with expectations of confidentiality and even privacy regulations.
Implementation Complexity
According to Deloitte®, blockchain systems can be complex to design and implement. Organizations must navigate integration challenges, interoperability issues, and a lack of standardization across platforms. These challenges contribute to adoption barriers, particularly for enterprise blockchain initiatives.
The Future of Blockchain
Blockchain and generative artificial intelligence (AI) will likely continue to evolve, but blockchain’s role will be more focused than transformative – and probably not in the way early hype has suggested. Rather than replacing existing systems, blockchain will serve as a complementary technology for specific use cases.
According to World Economic Forum®, improvements in scalability, reductions in energy consumption, and increased interoperability may expand blockchain’s future applications. Meanwhile, regulatory clarity will shape how organizations adopt blockchain.
Worthington suggests that blockchain may represent an early stage in the evolution of distributed systems, describing it as “a first-generation distributed-data architecture.” This perspective points toward a future where new technologies build on or move beyond blockchain entirely.
The Bachelor of Science in Information Technology at APU
For adult learners, American Public University offers an online Bachelor of Science in Information Technology. For this degree, students can enroll in courses such as information systems design, object oriented design, and database concepts. Other courses include securing databases, securing applications, and web development fundamentals.
This B.S. in information technology features five concentrations to enable students to tailor their education to meet their professional goals:
- Programming
- General
- Project Management
- Programming Full Stack/Python® Visualization
- Blockchain and Digital Currency
Courses in the blockchain and digital currency concentration may prove especially useful for students interested in blockchain technologies:
- Introduction to blockchain and cryptocurrency
- Applications of blockchain
- Blockchain and crypto programming
- Object oriented programming with Java®
- Blockchain technology for business
For more information about this bachelor’s degree in IT, visit APU’s information technology degree program page.
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