The shift in global digital infrastructure in the period 2025-2030 is witnessing a fundamental revolution. Blockchain technology is no longer a term associated with speculative crypto assets but has become the backbone of modern data management, finance and supply chain systems. At the heart of this architecture is Byzantine Fault Tolerance (BFT), a mechanism that allows distributed systems to maintain correct operation even when components misbehave or are intentionally destructive.
1. Byzantine Fault Tolerance (BFT): Decoding the Trust "Rule Set"
BFT is not just a technical protocol but also a solution to a philosophical problem: how to build unified truth in an environment where agents are not necessarily honest with each other.
The Problem of the Byzantine Generals
This term takes its name from a famous 1982 military metaphor by Leslie Lamport, Robert Shostak, and Marshall Pease. The metaphor describes generals needing to agree on a plan to attack or retreat through a postman. The challenge lies in the fact that there can be traitors sending conflicting information to undermine the consensus.
Mathematical error tolerance threshold 3f+1
Tan Phat Digital's research shows that, in a normal communication system, consensus cannot be reached if the number of traitors accounts for 1/3 or more of the total number of members. To tolerate f faults, the system needs at least:
n≥3f+1
This ensures that honest nodes (n−f) can overwhelm false information from faulty nodes (f) even under asynchronous network conditions.
Comparison of BFT and Crash Fault Tolerance (CFT)
Fault nature: CFT only handles nodes that are offline, while BFT also handles nodes that act maliciously or send fake news.
Trust assumption: CFT assumes nodes do not lie; BFT assumes nodes can deceive.
Applications: CFT is suitable for internal systems (Raft, Paxos); BFT is required for public blockchain and consortium networks (pBFT, HotStuff).
See more: How does Blockchain work?
2. Types of Blockchain Architecture in the Digital Economy 2025-2026
According to Tan Phat Digital's analysis, choosing blockchain architecture is an important business strategy, affecting scalability and legal compliance, especially when Vietnam implements the Digital Technology Industry Law on January 1, 2026.
Public Blockchain: Decentralized Philosophy without Borders gender
This is the most primitive form, operating on the principle of no permissions (permissionless).
Operating mechanism: Using technical-economic consensus algorithms such as Proof of Work (PoW) or Proof of Stake (PoS) to protect the network.
Cryptographic hash formula: Each block contains the digital fingerprint of the previous block: Hn=Hash(Ln−1+Tn+nonce).
Features: Absolute transparency and high censorship resistance, but challenges scalability (Bitcoin only reaches ~7 TPS).
Private Blockchain: Optimized for Business
A privileged system operating in a closed network, managed by a single organization.
Authority: The operating entity controls all participating nodes and has the authority to overwrite data if necessary to comply with regulations.
Performance: Uses lightweight protocols like Raft, achieving speeds of thousands of transactions per second with instant completion times.
Limitations: Low decentralization, users must put trust in the management organization.
Permissioned & Consortium Blockchain: Hybrid Model for Multilateral Cooperation
Governance rights are shared by a group of entities (consortium).
Structure: Set up different access roles (RBAC).
Consensus: Often use pBFT or Proof of Authority (PoA) to achieve high speed while still effectively preventing fraud.
Application: Typically Hyperledger Fabric for businesses or NDAChain in Vietnam.
3. The Leap in Consensus Technology: From pBFT to HotStuff-2
The Evolution of Protocols
Practical BFT (pBFT): Reduces complexity from exponential to O(n2), providing instant completeness but limited to a scale of a few hundred nodes.
Tendermint (CometBFT): Standard for alliance networks with group leader rotation mechanism, ensuring no forks.
HotStuff & HotStuff-2: HotStuff achieves linear complexity O(n) thanks to the threshold signature. HotStuff-2 (2025) shortens the process to 2 stages, reducing latency by 33%.
HoneyBadgerBFT: Fully asynchronous protocol, eliminating group leader weakness against DoS attacks.
Detailed Specifications (Comparison List)
pBFT: 3-round delay; CommunicateO(n2); Suitable for small-scale networks; Be responsive.
Tendermint: 3-round delay; O(n) communication (when used optimally); Suitable for App-chain; Not responsive (based on timeout).
HotStuff: 4 round delay; CommunicateO(n); Suitable for large scale (Aptos, Sui); Have an optimistic response.
HotStuff-2: 2 round delay; CommunicateO(n); Highest speed optimization in modern BFT lines.
See more: Is blockchain safe?
4. Blockchain in Vietnam: National Strategy and Roadmap 2026
Vietnam is emerging as a regional blockchain center with groundbreaking legal steps and infrastructure.
Digital Technology Industry Law 2026
The law takes effect from January 1, 2026, officially legalizing the concept of "digital assets" and "crypto assets"
Classification of assets: Divided into three groups: Virtual assets in the electronic environment, Encrypted assets and Other digital assets.
Ownership rights: Recognizes the right to own, trade and invest in digital assets, protecting people similarly to physical assets.
Payment: The law clearly stipulates that virtual assets can be used. for investment and exchange but not used as a means of payment.
NDAChain: Digital Sovereignty Infrastructure
National Blockchain platform hosted by the Ministry of Public Security, operating according to the Consortium model with 49 authentication nodes.
Technology: Using PoA combined with Zero-Knowledge Proof (ZKP) to protect data personal data.
Performance: Processes 3,600 transactions/second with a latency of only 1.5 seconds.
Core applications: NDA DID (Digital Identification), NDA Trace (Traceability) and Decentralized Identity Wallet.
5. Blockchain Labor Market 2026
The demand for blockchain human resources in Vietnam is growing strongly with attractive income. Tan Phat Digital compiles income forecast for 2026:
Blockchain Engineer: Junior level from 20-35 million; Middle from 50-90 million; Senior can reach 120-250 million VND/month.
Smart Contract Auditor: Extremely rare position with Senior salary up to 200-400 million VND/month due to strict security requirements.
Trend: Businesses are shifting from expanding scale to optimizing technological capacity, especially incorporating AI and Blockchain.
6. 10 Typical Case Studies on Blockchain Applications 2025-2026
Below are typical examples illustrating the power of BFT and Blockchain in the digital economy compiled by Tan Phat Digital:
NDAChain (Vietnam) - Identification and Traceability: The Ministry of Public Security deploys a 49-node alliance network to manage digital identification wallets (DID) and authenticate goods (NDA Trace), helping to reduce retrieval time from several days to a few seconds.
Project mBridge - Cross-border payment: Wholesale CBDC initiative of China, Hong Kong, Thailand, UAE and Saudi Arabia have processed over $55 billion in transactions (as of end-2025) thanks to DLT's instant fulfillment speed.
BlackRock BUIDL Fund - Tokenize RWA:BlackRock's tokenized money market fund on Ethereum to reach $2.3 billion in assets under management by 2025, uses blockchain to make automatic daily dividend distributions months.
Circle Arc - Enterprise payment blockchain: Circle launches Layer-1 dedicated to stablecoins, using USDC as gas fee and Malachite consensus mechanism to achieve latency of less than 1 second, optimal for large-scale B2B transactions.
Sony Soneium - Entertainment and Web3: Sony Group launches Soneium mainnet in early 2025 to protecting intellectual property (IP) rights and creating a fan engagement ecosystem for the J-Pop and anime industry.
Ministry of Education and Training (Vietnam) - NQA: National Qualifications Archive project uses blockchain to issue and authenticate tamper-proof degrees, helping to completely prevent the problem of fake degrees.
GSBN (Global Shipping Business Network) - Logistics: Alliance of major shipping lines (such as COSCO, OOCL) uses Consortium Blockchain to digitize Bill of Lading, reducing operating costs by 20% for the global supply chain.
Power Ledger - P2P energy trading: Deployed in India and Austria, allowing households to freely buy and sell excess solar power through smart contracts, helping to reduce grid load and cost savings.
Shell - Green fuel tracking: Shell uses blockchain to match green energy production and consumption orders in real time (24/7 green energy matching) and authenticate environmental attributes for sustainable aviation fuel (SAF).
Nadcab Labs - Smart health: Deploy an encrypted electronic medical record (EHR) system, allowing share medical data securely between hospitals globally while the patient retains absolute control via private key.
7. Frequently asked questions about Blockchain & BFT 2026
Below is a summary of in-depth answers from Tan Phat Digital for businesses and investors:
How are digital assets classified according to the Digital Technology Industry Law 2026? According to the 2026 Law, digital assets include 3 types: Virtual assets (used for exchange/investment), Encrypted assets (using encryption technology to authenticate the original asset) and other Digital Assets.
Is Bitcoin allowed to be used for payment in Vietnam from 2026? No. The law stipulates that virtual assets can only be used for investment and exchange purposes, and absolutely cannot be used as a means of payment to replace fiat currency.
What is NDAChain and who manages this platform? NDAChain is the National Blockchain Platform, acting as the "backbone" for Vietnam's digital data infrastructure, operated by the National Data Center (Ministry of Public Security).
How does Zero-Knowledge Proof (ZKP) technology in NDAChain help people? ZKP allows people to authenticate their identity (such as age, place of residence) without revealing sensitive original data, helping to maximize privacy protection in the digital environment.4
Threshold Signatures help improve BFT like that What? Threshold signatures allow hundreds of signatures to be merged into a single proof, helping to reduce transmission bandwidth and bring message complexity to linear O(n)
What is the biggest difference between HotStuff and HotStuff-2?
HotStuff-2 shortens the consensus process from 3 stages to 2 stages (removing the "key phase"), reducing latency by 33% while still maintaining absolute safety.
- Store large data on the Cloud (to save costs) and only store hashes on the blockchain for authentication, helping to balance performance and security.
What is the income forecast for Blockchain industry personnel in Vietnam in 2026?The average salary in the IT/Blockchain industry is expected to increase by 15-20% by 2026.28 Senior Blockchain Engineer position can reach 120-250 million VND/month.
How is NDAChain compatible with international blockchains? NDAChain complies with international standards such as W3C DID, Verifiable Credentials and GDPR, allowing cross-border data and identity interoperability, especially within ASEAN.
Byzantine Fault Tolerance (BFT) is a platform indispensable foundation for trust in the digital era. The combination of classical BFT theory and modern architectural patterns has created a transparent and secure data ecosystem. For Vietnam, the period 2026 is a "golden time" for businesses to take advantage of the new legal corridor and NDAChain infrastructure to make a breakthrough. Understanding and mastering BFT is the key to leading in the future digital economy.
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