Evaluating the Security Risks of Off-chain Transactions

Evaluating the Security Risks of Off-chain Transactions
Evaluating the Security Risks of Off-chain Transactions

Off-chain transactions are gaining popularity worldwide due to their low/zero-cost system. Are they a safe way to transact? Or what is the level of risk involved in these transactions? This article evaluates the security risks of off-chain transactions. 


Blockchain technology can be used to facilitate cryptocurrency transactions in the absence of a trusted third party, such as a bank. 


Because they are verified and recorded on a publicly distributed ledger that cannot be modified, “on-chain” transactions on a blockchain provide better security and transparency.


However, blockchain transactions may incur significant costs and have long processing periods depending on the network’s verification technique. 


For example, a Bitcoin (BTC) payment can take a few minutes to a few days to be confirmed on the Bitcoin network.


Off-chain transactions are confirmed outside the leading blockchain network, typically resulting in a cheaper and faster transaction for the user.


We will look at what on-chain and off-chain transactions are about before focusing on off-chain transactions. 


What are On-chain Transactions?

On-chain transactions occur on the blockchain, a public database that records every cryptocurrency transaction


These transactions include the transfer of digital currencies such as Bitcoin BTC and Ether ETH from one address to another. 


They are recorded on the blockchain transparently and irreversibly. Anyone can use blockchain explorers to observe and verify on-chain transactions.


These transactions are critical to the operation of cryptocurrencies because they serve as a record of ownership and the transfer of digital assets. 


Off-chain transactions involving moving cryptocurrency away from the blockchain are typically faster and have lower transaction fees but may contain trusted intermediaries.


The blockchain network’s integrity and security depend on on-chain transactions, which are also a primary focus of blockchain research and auditing to ensure the precision and transparency of crypto transactions.


Benefits of On-chain Transactions 

The benefits of on-chain transactions include the following;

  1. Decentralization
  2. Security
  3. Transparency



Because a centralized authority does not govern blockchains, there is almost no possibility of an intermediary breaching trust or distorting data flow.



Data saved on a blockchain is encrypted from beginning to end and cannot be changed once recorded.



The usage of a distributed ledger means that transactions are recorded and validated in numerous locations at the same time. 


Anyone can track a trade back to a unique wallet address and examine its activities using a blockchain explorer, allowing for independent verification of claims and transactions.


We believe on-chain transactions are well understood now. Let us proceed to look into off-chain transactions.


What are Off-chain Transactions?

Off-chain crypto transactions occur outside the blockchain network and are not immediately documented. 


Instead, these transactions are completed via additional layers or alternative settlement techniques, with the final settlement eventually being broadcast on the blockchain.


Off-chain transactions are defined by their ability to improve blockchain network scalability and reduce congestion. 


They provide efficiency and cost-effectiveness while speeding up transaction processing, making them ideal for small-scale payments and daily transactions. 


Another differentiating aspect is the confidentiality of transaction information until it is finalized on the main blockchain.


Plus, because consumers must rely on third-party solution providers, these transactions are entwined with the concept of trust. 


Notably, they enable complex smart contract interactions and support interoperability between several blockchains using technologies such as sidechains. 


However, regular settlement on the main blockchain creates a unique set of challenges because it is required to ensure security and integrity.


How Does Off-chain Transactions Work?

To understand how off-chain transactions work, consider the example of a sidechain. Here’s how it works in detail:


Sidechain Creation

A sidechain is created as a separate blockchain network that can communicate with the primary blockchain. This sidechain is frequently constructed to provide scalability possibilities.


Two-Way Peg

Introducing a two-way peg mechanism allows users to move their assets, such as cryptocurrency tokens, back and forth between the main blockchain and the sidechain. This pegging device links the two chains.


Furthermore, users can quickly move their assets between the main blockchain and the sidechain using the two-way peg, assuring compatibility.


Asset Locking 

To initiate an off-chain transaction, a user locks a particular number of cryptocurrency tokens from the principal blockchain inside a smart contract


This ensures that the assets are protected throughout the off-chain transaction and can be used as collateral.


Off-chain Transaction

After the assets have been locked, the user can use the sidechain to do various off-chain operations. These transactions take place outside of the main blockchain, which allows for faster processing and lower expenses.


Record Keeping 

Even when the facts of each transaction are not immediately disclosed on the main blockchain, the sidechain maintains a separate ledger to keep track of off-chain transactions.


Final Settlement

Users who want to settle or return to the main blockchain initiate an on-chain transaction. This transaction reflects the outcome of all off-chain transactions on the sidechain.



The main blockchain’s on-chain transaction releases the locked assets, making them available to the user. This method is commonly referred to as “pegging out.”


Blockchain Confirmation

The final balances are updated by confirming the on-chain settlement transaction on the main blockchain.


Technologies Aiding Off-Chain Transactions 

Depending on the off-chain protocol or technology, several approaches are used to confirm and facilitate off-chain transactions. Off-chain solutions and technology include the following:

  1. Sidechains
  2. Payment channels
  3. Centralized off-chain services
  4. State channels



Sidechains are autonomous blockchains that can interact with the principal blockchain. Users can move assets between the main and side chains to promote faster and more private transactions.


Payment Channels 

Payment channels, such as the Lightning Network for Bitcoin or the Raiden Network for Ethereum, allow users to create private channels for carrying out many transactions off-chain. Only the final settlement is documented on the blockchain.


For example, the Lightning Network, a layer-2 scaling solution for Bitcoin, establishes a network of two-way payment channels. 


Off-chain transactions occur over these channels, and participants can validate transactions by signing updated channel states. 


The final settlement is recorded on the Bitcoin blockchain when the channel is closed.


Centralized Off-chain Services 

Some off-chain transactions may occur via centralized services, where transactions are confirmed within the provider’s database. 


Although more trustless than decentralized systems, these transactions can have advantages in terms of speed and cost.


State Channels 

State channels are similar to payment channels in that they can support more complex interactions between smart contracts. 


They maintain the principal blockchain’s security while allowing users to conduct several transactions off-chain.


Advantages of Off-chain Transactions

Some advantages of off-chain transactions include;


  • They can be carried out in an instant. On-chain transactions, however, can have a considerable lag time, depending on network load and the number of transactions waiting to be confirmed in the queue.
  • Since nothing happens on the blockchain, off-chain transactions usually do not have a transaction fee. There is no fee because no miner or participant is required to validate the transaction, making it an appealing choice, especially when significant amounts are involved. Meanwhile, on-chain transactions can sometimes be expensive, resulting in Bitcoin Dust, a condition in which small quantities of Bitcoin cannot be traded due to excessive transaction costs.
  • Since details are not publicly broadcast, off-chain transactions provide greater security and anonymity to participants. In the case of on-chain transactions, examining transaction patterns can help to determine a participant’s identity.


The Security Risks of Off-chain Transactions 

Off-chain transactions have some drawbacks as well. Some of them are;


  • Because these transactions may need to be more trustworthy, users may need to rely on network operators or off-chain solution providers.
  • Periodic settlement on the main blockchain introduces settlement delays and potential security risks. They may be less responsible because off-chain transactions are less transparent than on-chain transactions.
  • Finally, not all use cases, such as the transfer of precious assets, are fit for off-chain transactions, particularly those that require the primary blockchain’s total security and decentralization.


Let’s see their fundamental differences with our updated understanding of what on-chain and off-chain transactions are.


Differences Between On-chain and Off-chain Transactions

On-chain transactions, as opposed to off-chain transactions, occur on the main blockchain network and are recorded on the blockchain network’s public ledger. 


Because all on-chain transactions must be confirmed by network participants using a consensus method, network speed may be slowed. 


Large numbers of transactions might overload the network and demand a lot of computational power. 


However, on-chain transactions benefit from increased in-network security. Off-chain transactions have no transaction fees because no miners are required to validate them. 


Final Thoughts 

Blockchain networks provide security, transparency, and ease of use when conducting a transaction. Still, some blockchain networks, such as Bitcoin or Ethereum, have limited scalability and frequently charge excessive transaction costs. 


Off-chain systems address these challenges by promoting faster processing times, reduced fees, and more discretion.


Having reviewed the security risks involved in off-chain transactions, make your transactions wisely.