What Is BIP 148?

What is BIP 148?

What is BIP 148? A Comprehensive Definition

Welcome back to our “Definitions” series, where we dive deep into the world of cryptocurrency and blockchain terminology. Today, we are exploring the intriguing concept of BIP 148. If you have been in the cryptocurrency space for a while, you might have come across this term, but perhaps its true meaning still eludes you. Well, fear not! In this blog post, we will demystify BIP 148 and provide you with a comprehensive understanding of its purpose and significance.

Key Takeaways:

  • BIP 148 stands for Bitcoin Improvement Proposal 148, which aims to activate a protocol upgrade known as Segregated Witness (SegWit).
  • It was introduced in June 2017 as a user-activated soft fork to encourage the adoption of SegWit and address the scalability challenges of the Bitcoin network.

BIP 148, also known as the UASF (User Activated Soft Fork), is an important milestone in the development of Bitcoin. It is a Bitcoin Improvement Proposal that was introduced in June 2017 by an anonymous developer using the pseudonym “shaolinfry.” Its main objective was to activate a protocol upgrade called SegWit (Segregated Witness) while encouraging the wider adoption of this improvement within the Bitcoin community.

So, why was BIP 148 necessary, and what is SegWit? Allow us to explain. The Bitcoin network has been facing scalability challenges, leading to slow transaction processing times and high fees. SegWit was developed to address these issues by separating transaction data from the signature data, allowing for more efficient use of block space. This upgrade would increase the capacity of the Bitcoin network, making it faster and more cost-effective.

The Significance of BIP 148

BIP 148 gained significant attention and support within the Bitcoin community because it signaled a user-driven approach to implementing protocol upgrades. Unlike other proposals that required miner activation, BIP 148 relied on the users to enforce the new rules. This method was seen as a way to bypass potential resistance from miners and expedite the adoption of SegWit.

By initiating a user-activated soft fork, BIP 148 created an ultimatum for miners. After a specific block height, any miner who did not signal support for SegWit would have their blocks rejected by nodes running the BIP 148 code. This user-driven initiative aimed to pressure miners to adopt SegWit or risk facing serious consequences within the Bitcoin network.

BIP 148 sparked heated debates and discussions within the cryptocurrency community. Its success relied heavily on widespread user coordination and support, as any division or lack of consensus could lead to a chain split and the emergence of a new cryptocurrency.


BIP 148, also known as the User Activated Soft Fork, played a crucial role in promoting the adoption of Segregated Witness within the Bitcoin network. It introduced a user-driven approach to activating protocol upgrades, bypassing potential resistance from miners. With its potential to improve scalability and transaction processing times, BIP 148 remains an important milestone in the evolution of Bitcoin and the broader cryptocurrency ecosystem.

If you found this post helpful, stay tuned for our upcoming “Definitions” series, where we break down complex cryptocurrency and blockchain concepts to help you navigate this exciting space with ease.