How Did SegWit Change the Transaction Structure in Bitcoin?

Want to learn more about crypto?
Explore more on our blog!
Learn more
Keywords: SegWit, transaction structure
Table of Contents
Keywords: SegWit, transaction structure

Key Takeaways:

  • Segregated Witness (SegWit) is a protocol upgrade that optimizes Bitcoin transactions separating witness information from the input field
  • SegWit brings several benefits, including increased speed and security, lower fees, and improved scalability.
  • Adoption has been gradual due to compatibility issues with different wallets and exchanges

How Did SegWit Change the Transaction Structure in Bitcoin?

Segregated Witness, or SegWit for short, is a protocol upgrade to the Bitcoin network that changes the transaction format by separating witness information from the input field.

This powerful upgrade to the Bitcoin transaction format has brought about essential changes, positively impacting speed, fees, and overall security.

But what exactly does it mean for Bitcoin users? In this blog post, we’ll demystify SegWit by exploring its purpose and effects on the structure of Bitcoin transactions.

Definition and Purpose

Segregated Witness, often abbreviated as SegWit, is a protocol upgrade designed to optimize the way Bitcoin transactions are structured. Introduced in 2017, its primary purpose was to address a longstanding issue known as transaction malleability, which could potentially result in incorrect or duplicate transactions on the network.

Besides tackling transaction malleability issues, this innovative protocol also brings several other benefits to the table. One such advantage is improving scalability – an essential aspect given that cryptocurrencies like Bitcoin continue to gain popularity and widespread adoption.

By reducing the size of individual transactions without compromising their security, SegWit effectively increases the capacity of each block on the blockchain.

Changes to Bitcoin Transaction Structure

SegWit’s impact on Bitcoin’s transaction structure is significant. Transactions consist of inputs and outputs, with witnesses’ information not included in the original count.

The addition of signatures increases the size of transactions, making it difficult to fit as many into a block within the given limit.

With SegWit in place, blocks can now store more transactions per unit of weight than before. It also enables simultaneous processing since it doesn’t have to wait for all prior signatures’ verification before moving forward with new transactions.

SegWit improves scalability through its changes to Bitcoin’s transaction format while sorting out issues related to malleability, script versioning, and wallet compatibility.

Benefits of Segregated Witness for Bitcoin Transactions

Segregated Witness brings multiple benefits to Bitcoin transactions, including increased speed and security, lower fees, and improved scalability – read on to learn more about how it achieves these goals.

Increased Transaction Speeds

SegWit’s optimization of Bitcoin’s transaction structure provides a significant boost to the speed at which transactions can be processed. By separating the digital signature data from each transaction, SegWit reduces its size, allowing more transactions to fit into a single “block.” This means that more transactions can be verified and added to the blockchain at any given time.

Also, the block size was increased from 1MB to 4MB to have more space for including transaction in one block.

As a result, users experience faster confirmation times for their Bitcoin transactions compared to pre-SegWit levels. For example, with SegWit activation on average block processing times fell 90% while fees for using bitcoin declined by over 50%.

Lower Transaction Fees

Segregated Witness (SegWit) has also had a significant impact on Bitcoin’s transaction fees making them lower. Before SegWit, Bitcoin transactions were limited by the block size limit, which meant that the number of transactions could only fit into each block was limited.

With SegWit’s introduction, blocks are measured in weight rather than size allowing for more simultaneous processing. This means that more transactions can fit into each block without increasing its size leading to a drop in congestion and therefore reducing the demand for higher fees.

Enhanced Security

One of the key benefits of SegWit is enhanced security for Bitcoin transactions. By separating witness information from transaction data, potential attacks on digital signatures are reduced, making it more difficult for hackers to steal funds or manipulate transactions.

SegWit addresses a long-standing issue called “transaction malleability“, which allowed attackers to change transaction IDs and disrupt network operations. With SegWit’s fix in place, these types of attacks are no longer possible.

Improved scalability means that Bitcoin can handle more transactions per second without compromising its decentralized consensus model or requiring significant changes to existing infrastructure.

Improved Scalability

One of the biggest advantages of Segregated Witness (SegWit) is its potential to improve scalability on the Bitcoin network. By removing witness data from the input, transactions can now take up less space in a block, allowing more transactions to fit into each block and reducing transaction times.

SegWit enables essential upgrades like Lightning Network and Atomic Swap that also improve Bitcoin’s scalability. The Lightning Network is a layer-two solution built on top of Bitcoin that allows users to send nearly instant and low-cost transactions by creating private channels between parties.

These improvements mean that Bitcoin can accommodate more daily transactions without becoming congested while still maintaining its decentralization and security features.

Adoption and Implementation of SegWit

SegWit was introduced as a soft fork change to the Bitcoin protocol in August 2017 and has since been adopted by many wallets and exchanges, with currently around 50% of all Bitcoin transactions using SegWit.

Timeline and Current Usage

Segregated Witness (SegWit) was first proposed in late 2015 as a potential fix to certain problems with the Bitcoin network. After years of discussion and debate, it was finally implemented on August 23, 2017, as part of a soft fork change to the Bitcoin transaction format.

Since then, SegWit usage has steadily increased among Bitcoin users and exchanges. The majority of users are taking advantage of the benefits that SegWit offers, such as increased transaction speeds and lower fees.

Not all wallets and exchanges have fully adopted SegWit yet. Some still use legacy addresses that are not compatible with SegWit transactions. This can lead to slower transaction times and higher fees for those users.

The adoption and usage of SegWit will continue to grow as more users realize its benefits. As the Lightning Network and other scaling solutions become more popular, we may see even greater adoption of SegWit in the future.

Compatibility and Compatibility Issues

Segregated Witness (SegWit) was introduced as a soft fork change to the Bitcoin transaction format. This means that it is backward compatible with legacy transactions, which do not use the SegWit protocol.

One compatibility issue with SegWit is that older Bitcoin software may not recognize transactions that use the new protocol. This can cause delays in confirmations or even result in a loss of funds if a transaction is rejected by nodes on the Bitcoin network.

On the other hand, many wallets and exchanges are already adopting SegWit because of its benefits for faster and cheaper transactions and improved security.

Although there may be some compatibility issues initially when adopting Segregated Witness, more services are moving towards supporting this protocol due to its advantages for optimizing blockchain capacity while maintaining backward compatibility.

Impact on Different Bitcoin Wallets and Exchanges

Segregated Witness has varying effects on different Bitcoin wallets and exchanges, with some embracing its benefits and others facing compatibility challenges. Here is a table highlighting the impact of SegWit on popular wallets and exchanges:

Wallet/ExchangeImpact of SegWit
Bitcoin CoreImplemented SegWit support, enabling users to reap its benefits of lower fees and increased transaction speeds.
ElectrumIntroduced SegWit support in version 3.0, providing users with improved transaction efficiency.
TrezorEmbraced SegWit early on, enabling users to access its advantages and ensuring increased security for transactions.
LedgerAdopted SegWit support, allowing users to enjoy its benefits while maintaining the security of their hardware wallet.
CoinbaseImplemented SegWit in early 2018, leading to reduced transaction fees and faster processing times for users.
BitfinexAdded SegWit support, lowering transaction fees and providing faster processing times for its users.
KrakenIncorporated SegWit support, offering users an improved transaction experience with reduced fees.
BinanceImplemented SegWit support, optimizing transaction fees and processing times for its users.

Please note that the impact of SegWit on wallets and exchanges may change over time as they continue to adapt and update their platforms.

Future of SegWit and Its Impact on Bitcoin

SegWit is expected to continue its growth and adoption as it solves major issues in Bitcoin’s transaction structure, with the potential of enabling faster transactions, increasing scalability, and improving security for the cryptocurrency network.

Potential for Increased Adoption

As more and more people become aware of the benefits SegWit offers to Bitcoin transactions, there is potential for a significant increase in adoption. With faster transaction speedslower feesenhanced security, and improved scalability, it’s no surprise that many users are looking to switch over to SegWit wallets.

With the continued development of related technologies such as the Lightning Network which utilizes SegWit for faster and cheaper micropayments on the Bitcoin network, we can expect even wider adoption in the future.

Impact on Bitcoin’s Price and Market

The implementation of SegWit has had a significant impact on Bitcoin’s price and market. In the months following its adoption, Bitcoin’s value surged to new heights due to increased transaction speeds and lower fees.

SegWit paved the way for further upgrades like the Lightning Network which aimed to make transactions even faster by enabling instantaneous micropayments between users.

This improved scalability coupled with enhanced security measures provided investors with renewed confidence in the longevity of cryptocurrency as a viable asset class.

Other Potential Upgrades and Changes

Aside from Segregated Witness, there are other upgrades and changes to Bitcoin that will impact its transaction structure. Here are some upgrades to look out for:

  1. Schnorr signatures – This upgrade aims to improve the efficiency of digital signatures used in Bitcoin transactions, which could lead to smaller transactions and greater scalability.
  2. Taproot – proposes a new scripting language that is easier and more efficient than the current one, making complex transactions simpler and more secure.
  3. Drivechains – These are sidechains that can operate independently while still being pegged to the main blockchain, allowing for more experimentation with new features without affecting the main network.
  4. Mimblewimble – This privacy-focused protocol will enable users to conceal their transaction details while still maintaining the integrity of the blockchain.
  5. Lightning Network Updates – The Lightning network is an off-chain scaling solution designed to enhance transaction speeds on Bitcoin’s blockchain. Improvements such as Atomic Multi-Path Payments (AMP) may allow multiple payments to be sent simultaneously across individual payment channels.


How Did SegWit Change the Transaction Structure in Bitcoin?

SegWit separated the transaction into two sections, where one section contains the transaction information and the other section contains the wallet addresses of the sender and receiver. This separate structure at the end of the transaction solved the transaction malleability problem.

What is the Transaction Malleability Problem?

The transaction malleability problem refers to the ability to change the transaction hash without changing its content. This created complications for various processes, such as tracking transactions and verifying their authenticity.

What Are the Benefits of SegWit?

SegWit brings several benefits to the Bitcoin network. It increases the block size limit without requiring a hard fork, improves transaction throughput, lowers transaction costs, and supports the development of second-layer solutions like the Lightning Network.

How Does SegWit Improve Transaction Throughput?

SegWit achieves higher transaction throughput by separating transaction signatures, called witness data, from the transaction itself. This allows more transactions to fit within a Bitcoin block, increasing the overall transaction speed of the blockchain network.

What is the Lightning Network?

The Lightning Network is a second-layer built on top of Bitcoin’s blockchain. It enables faster and cheaper transactions by creating payment channels between participants, reducing the load on the main blockchain.

Was SegWit Supported by the Entire Bitcoin Community?

No, there was some disagreement within the Bitcoin community regarding the implementation of SegWit. This led to the creation of Bitcoin Cash, a hard fork of the Bitcoin blockchain that increased the block size to address the transaction speed and scalability issues.

How Did SegWit Support the Development of the Lightning Network?

SegWit’s implementation provided a crucial foundation for the Lightning Network by solving the transaction malleability problem. With SegWit in place, developers were able to build and test the Lightning Network, which aims to scale Bitcoin for everyday transactions.

How Did SegWit Change the Transaction Into Two Segments?

SegWit introduced a new transaction structure where the original transaction is divided into two segments: the base transaction and the witness data. The base transaction contains the transaction information, while the witness data holds the signatures and other script-related elements.

What Was the Block Size Limitation Problem That SegWit Addressed?

Before SegWit, the Bitcoin blockchain had a size limitation of 1 MB per block. This restriction caused delays and increased transaction costs as the number of transactions on the network grew. SegWit increased the effective block size limit by segregating the witness data, enabling more transactions to be included within a block.

Conclusion: The Bitcoin Network is Expanded Continously

The protocol upgrade has a substantial impact on Bitcoin’s transaction structure by optimizing transaction size and addressing security issues.

With faster transactions, lower fees, and improved scalability, SegWit is set to revolutionize the way we use digital currencies. While adoption has been gradual due to compatibility issues with different wallets and exchanges, it remains an essential development in blockchain technology that could pave the way for future upgrades and improvements.



The information provided on this blog is for general informational and educational purposes only. It is not intended as financial, legal, or investment advice. Cryptocurrency investments are volatile and high risk in nature; it is possible to lose your entire investment. We are not financial advisors, nor do we purport to be.

While we strive to provide accurate and up-to-date information, we cannot guarantee the accuracy, completeness, or applicability of any information provided. The views and opinions expressed on this blog are solely those of the authors and should not be construed as professional advice. We do not endorse or guarantee the performance of any cryptocurrencies, projects, or companies mentioned herein.

Readers are encouraged to conduct their own research and consult with a professional financial and legal advisor before making any investment decisions. The owner of this website and the authors of its content will not be liable for any losses, injuries, or damages from the display or use of this information. Use of this information is at your own risk.

About the Author:
Morgan Davis, an expert in digital currency and economic analysis, offers a unique perspective on cryptocurrency within the global financial landscape. With a background in International Economics, Morgan's insights delve into how macroeconomic factors influence the crypto market. Their writing simplifies complex economic and cryptocurrency concepts, making them accessible to a broad audience. Morgan is actively engaged in discussions about the impact of blockchain on finance, and their work empowers readers to understand and navigate the world of digital currencies.