Dec 5, 2022

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Ways to avoid fraudulent transactions in public Blockchain

With the popularity of Bitcoin and other digital currencies, blockchain technology has been gaining traction in various industries. Blockchain is a distributed database that allows for secure, transparent, and tamper-proof record-keeping. This makes it well-suited for applications such as tracking financial transactions, supply chain management, and voting. However, blockchain is not without its risks. One major risk is the potential for fraudsters to exploit the system for their gain. This article will discuss how fraudsters can exploit public blockchains and how to avoid them. 

Blockchain Fraud 1: Double Spend Attacks 

A double-spend attack is when a fraudster tries to spend the same digital currency twice. This can be done by sending the currency to two different addresses or creating two transactions that pay the same inputs. If the fraudster can successfully execute a double-spend attack, they will be able to defraud the system of the currency. This attack is a major risk for digital currencies that use a public blockchain, such as Bitcoin. To avoid double-spend attacks, it is important only to accept digital currency payments confirmed by the network. For example, Bitcoin payments should not be considered confirmed until they have been included in six blocks on the blockchain. 

Fraud 2: Sybil Attacks 

A Sybil attack is when a fraudster creates multiple identities on a network to gain control of the network. This type of attack is a major risk for blockchains that use a proof-of-work (PoW) consensus algorithm. In a PoW system, miners compete to find the next block by solving a complex mathematical problem. The first miner to find the solution is rewarded with newly minted digital currency. If a fraudster can create multiple identities, they will have a greater chance of finding the next block and earning the reward. This type of attack can be used to 51% on a blockchain. To avoid Sybil attacks, choosing a blockchain platform that uses a different consensus algorithm, such as proof-of-stake (PoS), is important. In a PoS system, block creators are chosen based on their stake in the network. This means that a single entity can't control 
the network. 

Fraud 3: Denial-of-Service Attacks 

A denial-of-service (DoS) attack is when a fraudster attempts to flood a blockchain with so many transactions that it becomes overloaded and can no longer process new transactions. This attack can prevent legitimate users from accessing the blockchain or slow down the processing of transactions. To avoid DoS attacks, it is important to choose a scalable blockchain. For example, the Ethereum blockchain uses the sharding technique, which allows it to process more transactions than other blockchains.

Fraud 4: Malicious Nodes 

This type of node can spread false information or slow transactions' processing. To avoid malicious nodes, choosing a blockchain platform that uses a decentralized network is important. This means there is no single point of failure, and it is more difficult for fraudsters to control the network. Fraudster maintains the malicious node in the system. Decentralization in the blockchain helps the organization keep them safe from fraud. 


Blockchain technology has the potential to revolutionize various industries. However, it is important to be aware of the risks associated with public blockchains. In this article, we have discussed how fraudsters can exploit public blockchains and how to avoid them. While choosing a blockchain platform, it is important to consider the risk mitigation part to save the project's complexity, resulting in time and cost savings.
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