The rise of Blockchain technology over the past decade has created one of the greatest waves of expectations in the history of the information technology industry. Hailed as a "trust-establishing machine", Blockchain promises to redefine the way the world exchanges value, manages supply chains and secures data. However, actual implementation has revealed inherent limitations that, if not carefully considered, can lead to catastrophic failure. According to observations from strategic consulting projects at Tan Phat Digital, identifying scenarios where Blockchain is not suitable is an essential management skill, helping organizations avoid wasting resources and opportunity costs. This report provides an in-depth analysis of the technical, economic, legal, and practical aspects to provide a comprehensive view of when to avoid using distributed ledger technology.
Performance trade-offs and limitations of decentralized architecture
One of the top reasons why Blockchain is not suitable for many projects is the inevitable trade-off between decentralization and processing performance. In traditional software architecture, centralized databases are optimized for extremely high transaction speeds and extremely low latency. On the contrary, the nature of Blockchain requires every transaction to be validated by many nodes in the network through a consensus mechanism, leading to natural latency and bandwidth limitations.
Latency and transaction throughput in real-time applications
Projects requiring high transaction processing speed and low latency such as High-Frequency Trading systems, real-time industrial control platforms Real time, or social networking applications with millions of interactions per second are the first subjects that should not use Blockchain. Empirical studies show that integrating the Blockchain layer into a cloud system increases transaction latency by 120% to 450% compared to traditional centralized databases. Additionally, system throughput can be reduced by up to 70% when switching to a decentralized model.
This inefficiency is a technical characteristic. While centralized payment systems like VISA can process an average of 24,000 transactions per second (TPS), the world's largest Blockchain networks like Bitcoin only reach about 7 TPS and Ethereum about 20 TPS.
Compare performance metrics between systems:
Centralized database (Baseline MySQL): Achieve the lowest latency (milliseconds); Highest throughput (thousands to million TPS); Energy consumption at baseline (1.0); Linear scalability with hardware.
Blockchain (PoA-based Ethereum): Latency increased by 450%; Throughput is reduced by about 70%; Energy consumption is 15 times higher than centralized system; Encountering high consensus barriers when scaling.
Blockchain (Hyperledger Fabric): Latency increased from 120% to 200%; Throughput is 30% to 50% lower than traditional systems; 4.5 times higher energy consumption; Complex scaling configuration.
For any system where performance is a top priority, using Blockchain will create an unnecessary bottleneck.
Bandwidth issues and data bloat
Every node in the Blockchain network must store a copy of the ledger to ensure authenticity. This creates a huge data redundancy. Bitcoin currently requires a minimum of about 145 GB of storage space just to download the entire transaction history, and this number is constantly increasing. For projects that store large volumes of information such as multimedia files, videos or IoT sensor data continuously, Blockchain is an extremely inefficient choice. Storing junk data from years ago just to validate a transaction today is a serious waste of resources.
Data governance and conflicts with legal privacy
Immutability is often touted as the biggest advantage, but in the reality of modern data governance, it is a huge risk. The nature of data that can only be added (append-only) and cannot be directly corrected or deleted strongly conflicts with basic legal rights.
Conflicts with personal data protection regulations (GDPR)
The European Union's General Data Protection Regulation (GDPR) establishes the "Right to be Forgotten", allowing individuals to request deletion of personal data. Once information is recorded on a public Blockchain, it is technically impossible to delete it without breaking the entire blockchain. Penalties for non-compliance with GDPR can be up to 20 million Euros or 4% of total global turnover. Therefore, any project involving personally identifiable data (PII), medical records, or sensitive information that needs to be updated regularly should not use Blockchain as the main storage layer.
Technical solutions and new barriers
Several models such as CRAB (Create, Read, Append, Burn) have been proposed to simulate data deletion by disabling encryption keys or storing sensitive data off-chain (off-chain). However, this increases the complexity of the architecture and often loses the core value of decentralization. If a project requires flexible data modifications, traditional databases are still the optimal and safer solution.
Analyzing implementation costs and financial barriers
Implementing a Blockchain project is never cheap. Although it is possible to reduce intermediary transaction costs in some cases, the initial infrastructure, personnel and security costs often far outweigh the benefits for small or medium-sized projects.
Infrastructure and energy investment
Businesses need to invest heavily in mechanical infrastructure to ensure data storage and maintain network stability. Bitcoin's Proof of Work (PoW) system consumes the same amount of electricity as a country like Denmark. Even more modern mechanisms like Proof of Stake (PoS) require significant computational resources to maintain continuous authentication between nodes.
Intensive personnel and security testing costs
Security is the most expensive aspect. Because vulnerabilities in smart contracts are permanent, source code testing (Audit) is mandatory.
Project Audit Cost Estimate (Updated 2025):
Basic ERC-20 Token / NFT: Low complexity; Estimated costs range from $5,000 to $15,000; Implementation time is 3 to 5 days.
Average financial dApp: Medium complexity; Estimated costs range from $15,000 to $40,000; Implementation time is 1 to 2 weeks.
DeFi Protocol / Large DEX: High complexity; Estimated costs range from $40,000 to $100,000; Implementation time is from 2 to 3 weeks.
Enterprise multi-chain system: Very high complexity; Estimated costs range from $100,000 to more than $200,000; Implementation time is from 3 to 5 weeks or more.
In addition to Audit fees, the cost of hiring Blockchain personnel is often 30-50% higher than traditional programmers due to scarcity of resources. For a small-scale project, this is an unnecessary financial burden.
Centralized Systems and Blockchain Redundancy
A common mistake is applying Blockchain to systems where a trusted intermediary already exists. Blockchain is designed to solve the "trust" problem between parties that do not trust each other. If the project only serves internal data management or is guaranteed by a state agency, using Blockchain is redundant.
Decision model from consulting practice of Tan Phat Digital
Based on the decision chart of ETH Zürich experts, we recommend considering 4 key points:
The need for state storage: If long-term data storage is not needed, there is no need to Blockchain.
- notes:If the parties already trust each other or have strong legal ties, Blockchain only slows down the process.
Most enterprise projects today have the presence of TTP or certain trust. In these scenarios, an append-only ledger combined with digital signatures and traditional databases would be thousands of times more secure and faster.
Lessons from failed projects and transitions
History records a series of ambitious Blockchain projects being killed or converted to traditional technology due to ineffectiveness.
The collapse of supply chain alliances: Case study TradeLens
TradeLens, a project of IBM and Maersk, closed after 5 years. Despite solid technology, the project failed because of governance issues: competitors did not want to share sensitive data on platforms co-owned by direct competitors. In addition, incompatibility between competing networks has created costly "data oases".
Komgo and abandoning Blockchain for efficiency
Komgo is an example of success by... eliminating Blockchain. Initially using the Quorum Blockchain infrastructure, they found it slowed down the process. After being replaced with a centralized database, the platform operates more efficiently while still maintaining partner trust. This proves that Blockchain is sometimes just a marketing keyword rather than an essential technical solution.
Safety and Risk: Is Blockchain really safe?
Blockchain is not impossible to hack, it just changes the attack methods. Private key management and the risk of majority attacks are a constant threat.
51% Attacks and Smart Contract Vulnerabilities
A network is only as secure as its computing power is widely dispersed. In a 51% attack, a group of miners controlling more than half of the network power can manipulate transactions. Small networks are extremely vulnerable because of the low attack cost.
In addition, logic errors in smart contracts are the cause of a series of bankruptcies. Unlike traditional applications that can be restored from backups, assets lost on Blockchain are often permanent. The ByBit hack in 2025 with a loss of 1.5 billion USD is a typical example.
Bitcoin and frequently asked questions about its technical value
Why are there only 21 million Bitcoin?
This limit is set through the block reward algorithm and Halving mechanism (halving the reward every 210,000 blocks). The mathematical formula for the total number of Bitcoins approaches 21,000,000 units: $50 \times 210,000 \times (1 + 1/2 + 1/4 + 1/8 + \dots)$. Satoshi Nakamoto designed this limit to create scarcity and prevent inflation, similar to gold.
Who is Satoshi Nakamoto and the Bitcoin giant in Vietnam?
Satoshi's identity is still the biggest mystery. It is estimated that Satoshi owns 1.1 million BTC (more than 100 billion USD). In Vietnam, experts revealed that there are individuals who own up to 20,000 Bitcoin but never reveal their identities due to lack of legal protection. A prominent name often mentioned by the community is YouTuber Khoa Pug, who is said to own about 1,000 BTC as of early 2026.
Legal regulations in Vietnam (Updated 2025 - 2026)
For projects in Vietnam, the biggest barrier is legal. New regulations have changed the game:
Market pilot (Resolution 05/2025/NQ-CP): Allows piloting the crypto asset market for 5 years from September 9, 2025.
Strict conditions: Enterprises must have a minimum capital of 10,000 billion VND; Shareholder structure must have at least 35% from banks or securities/insurance companies; The system must reach Level 4 security.
Payment: Using cryptocurrency as a means of payment is still illegal in Vietnam.
People also ask
Are Cryptocurrency (Crypto) and Bitcoin the same thing?
Not entirely. Bitcoin (BTC) is the first and most famous cryptocurrency, considered "digital gold". Crypto is a general term for all digital currencies that use encryption and Blockchain technology to secure transactions. Currencies created after Bitcoin are often referred to as Altcoins (such as Ethereum, Solana).
Is there a penalty for using Bitcoin to pay in Vietnam? Yes. Issuing, supplying and using cryptocurrency as a means of payment in Vietnam is illegal. These acts may be subject to administrative sanctions or criminal prosecution. However, holding Bitcoin as an investment asset is currently in a controlled pilot phase.
How to delete personal data on Blockchain to comply with GDPR? Technically, deleting data directly on a blockchain is impossible due to immutability. To comply with GDPR's "Right to be Forgotten" regulations, organizations often adopt an off-chain model of storing sensitive data and only storing hashes on-chain. In addition, the CRAB model allows to simulate deletion by disabling or destroying the encryption keys associated with that data.
Why did large projects such as IBM's TradeLens and Maersk fail?The main reason lies not in the technology but in the governance model and the lack of trust between the competing parties. Other shipping companies are concerned about sharing sensitive data on a platform directly owned by a competitor. In addition, operating under a platform model instead of a protocol has limited the ability to scale the entire industry.
What is a 51% attack and how dangerous is it? This is a situation where one entity or group controls more than 50% of the computing power of the Blockchain network. Once in control of the majority, an attacker can manipulate transaction validation, perform "spending the same coins twice" and block new transactions. Small networks with few validating nodes are extremely vulnerable to this type of attack.
How much does it cost to audit a smart contract today? Costs range widely depending on the complexity of the source code: from 5,000 - 15,000 USD for simple tokens to over 150,000 USD for multi-chain systems or complex financial protocols. Implementation time can last from a few days to several months depending on the amount of lines of code (LOC) and the number of rounds of checks required.
Why is Bitcoin limited to 21 million VND? This is a mathematical rule pre-programmed by Satoshi Nakamoto to create scarcity and fight inflation. This number is calculated based on the sum of an infinite backward multiplier in block rewards after each Halving cycle (every 4 years): $\sum_{i=0}^{\infty} 210,000 \times \frac{50}{2^i} \approx 21,000,000$. It is expected that the last Bitcoin will be mined in 2140.
Will Vietnam allow the establishment of a crypto asset exchange? According to Resolution 05/2025/NQ-CP, Vietnam will begin allowing the pilot of the crypto asset market from September 9, 2025. However, the conditions for participation are extremely strict: the business must have a minimum charter capital of VND 10,000 billion, a shareholder structure with the participation of a bank or securities company, and an information system that meets Level 4 security.
Who is Satoshi Nakamoto and how many Bitcoins does he currently own? Satoshi Nakamoto is the pseudonym of the person (or group of people) who created Bitcoin. The true identity remains unknown despite many theories targeting famous cryptographers. It is estimated that Satoshi owns about 1.1 million BTC, worth more than 100 billion USD in 2025, but this amount has never been moved from the original wallet since 2010.
How much Bitcoin does Khoa Pug really have in 2026?
According to market analysis data in early 2026, YouTuber Khoa Pug is estimated to be holding about 1,000 Bitcoins. This number is equivalent to about 90 million USD (more than 2,300 billion VND) at the exchange rate as of January 2026, making him one of the largest public owners of Bitcoin in Vietnam.
When should and should not use Blockchain?
Blockchain is a powerful technology but not a solution to all problems. The success of the project depends on choosing the right tool instead of following trends.
Cases where Blockchain should ABSOLUTELY NOT be used:
Requires performance to process thousands of transactions per second with extremely low latency.
Data needs to be edited or deleted regularly to comply with the law (GDPR).
The system already has a worthy administrator trusted or for internal service.
Need to store large amounts of data such as videos and high-quality images.
Tight budget and lack of a team of specialized security experts.
Cases where you SHOULD consider using Blockchain:
The environment lacks trust and does not want to empower any party.
Requires absolute transparency and auditability (voting, qualifications).
Create and verify ownership of unique digital assets (NFT).
Build decentralized finance (DeFi) ecosystems that operate automatically 24/7.
Tan Phat Digital recommends that businesses focus on value core of business problem. Blockchain should only be considered when the central problem is a trust deficit that modern centralized solutions cannot adequately address.
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