Many observers mistakenly believe that Bitcoin Cash (BCH) differs from Bitcoin (BTC) only in its larger block size, considering it a simplistic fork without substantial technical innovation. However, as both networks have evolved, significant technical distinctions have emerged that go far beyond block capacity. These differences influence transaction speed, security, network stability, and future development pathways.
Block Size and Scalability
BCH initially launched with an 8MB block size, which was later increased to 32MB. A 32MB block can process up to 10 million transactions per day, allowing users to consistently pay minimal fees—often as low as 1 satoshi per byte. This scalable design means BCH can continue increasing block sizes as technology and demand grow, ensuring low-cost transfers remain available.
In contrast, BTC has maintained a 1MB block size, with some proposals even suggesting a reduction to 300KB. During periods of high demand, BTC’s limited capacity causes transaction fees to skyrocket, sometimes reaching 100 to 1000 times higher than those on BCH.
Mining Difficulty Adjustment
BCH originally used the Emergency Difficulty Adjustment (EDA) algorithm but later transitioned to the more sophisticated Difficulty Adjustment Algorithm (DAA). The DAA adjusts mining difficulty with each new block, allowing the network to respond rapidly to sudden changes in hash rate.
Consider a scenario where 90% of SHA-256 mining power suddenly disappears. BTC’s difficulty adjustment occurs only every 2016 blocks (approximately every two weeks). The remaining 10% of miners would need about 20 weeks to adjust the difficulty, resulting in an average block time of 100 minutes. This would lead to severe network congestion, unconfirmed transaction backlogs, and system instability.
Thanks to the DAA, BCH can restore normal block production within days. Even during difficulty adjustments, larger blocks allow BCH to continue processing transactions efficiently, preventing mempool overload. This makes BCH more resilient in extreme situations.
Segregated Witness (SegWit)
SegWit was implemented in BTC primarily for two reasons:
- Limited Scalability Improvement: While BTC’s block size remains capped at 1MB, SegWit allows actual block capacity to reach around 1.2MB—or up to 1.4MB with full adoption. However, this pales in comparison to BCH’s 32MB capacity, making SegWit irrelevant for BCH.
- Lightning Network Support: BTC’s transaction malleability issue complicated Lightning Network deployment. SegWit “fixes” this but only for addresses using SegWit formats; legacy addresses remain vulnerable. BCH developers are planning a November upgrade to eliminate transaction malleability entirely for all address types.
Thus, SegWit offers no practical value for BCH.
Replace-by-Fee (RBF)
RBF allows BTC users to replace an unconfirmed transaction with a new one that pays a higher fee, effectively canceling the original transaction. This feature makes zero-confirmation transactions on BTC completely insecure, and there have been reported cases of malicious actors exploiting RBF.
BCH removed RBF at its inception, prioritizing transaction finality and security for instant payments.
Schnorr Signature Technology
Schnorr signatures offer faster verification and smaller data footprints compared to Bitcoin’s current ECDSA standard. After years of academic review, BCH integrated Schnorr signatures in its May upgrade.
BTC has also researched Schnorr signatures but faces delays due to its complex and lengthy upgrade processes, leaving implementation timelines uncertain.
Canonical Transaction Ordering (CTOR)
CTOR, introduced in BCH’s November upgrade, replaces the traditional Topological Transaction Ordering (TTOR). Key advantages include:
- Simplified implementation compared to TTOR’s complex parent-child dependency requirements.
- Improved mining efficiency by eliminating the need to sort transactions for child-pays-for-parent (CPFP) scenarios.
- Parallel block validation, reducing bottlenecks caused by intermediate state requirements.
- Enhanced block propagation efficiency, especially when combined with compression protocols like Graphene.
- Reduced system complexity and mitigation against malicious attacks exploiting transaction ordering.
Block Compression Techniques
BCH supports two advanced block compression technologies:
- Xthinner: Leveraging CTOR, Xthinner achieves compression rates up to 99.5% and performs robustly under diverse conditions.
- Graphene: Especially effective with larger blocks, Graphene can achieve compression rates as high as 99.9%.
BTC’s insistence on small blocks makes block compression unnecessary.
Token Functionality: SLP vs. Omni
The Simple Ledger Protocol (SLP) is one of BCH’s most significant recent innovations. It enables users to create and transfer tokens with minimal fees and supports instant zero-confirmation transactions. SLP is supported by a growing ecosystem of wallets, developers, and explorers, with thousands of tokens already issued.
In contrast, BTC’s Omni protocol (used for USDT) does not support zero-confirmation transactions and involves complex token creation processes. SLP offers a superior user experience for tokenization. 👉 Explore more tokenization strategies
Frequently Asked Questions
What is the main philosophical difference between BTC and BCH?
BTC prioritizes decentralization and security through limited block sizes and layered solutions like the Lightning Network. BCH emphasizes on-chain scalability, low fees, and usability as a medium of exchange.
Can BCH handle more transactions per second than BTC?
Yes. Due to its larger blocks, BCH can process significantly more transactions per second without relying on off-chain solutions.
Is BCH more secure than BTC?
Both networks use robust proof-of-work consensus. BCH’s DAA provides faster difficulty adjustment, enhancing stability during hash rate fluctuations, but security also depends on network effects and miner distribution.
Why did BCH remove Replace-by-Fee?
BCH removed RBF to ensure zero-confirmation transactions remain secure for everyday payments, supporting use cases like point-of-sale transactions.
Does BCH have smart contract capabilities?
While not as advanced as some platforms, BCH supports basic smart contracts and tokenization through SLP and other evolving protocols.
Will BCH continue to increase its block size?
Yes. BCH’s roadmap includes ongoing block size increases to accommodate future demand and maintain low transaction costs.
Conclusion
The technical differences between BCH and BTC extend far beyond block size. From adaptive difficulty adjustments and malleability fixes to innovative compression and tokenization protocols, BCH has pursued a distinct path focused on scalability, efficiency, and practical usability. As both networks continue to evolve, their technical divergences are likely to grow even further.