Bitcoin forks are often grouped together as if they differ mainly by ticker, block height or distribution rules.
ECX and the chain that emerged from BIP110 show why that can be misleading.
Both appeared during the same period in 2026. Both originated in disagreements about Bitcoin's technical direction. Both ultimately created networks separate from Bitcoin.
But the similarities quickly end.
BIP110 began as an attempt to restrict certain uses of Bitcoin's base layer. ECX was designed around BIP300/301 to move experimentation away from the base layer and into optional drivechains.
Their mining paths also diverged. The BIP110-derived network ultimately moved away from Bitcoin's SHA-256d proof of work to Blake2b. ECX retained Bitcoin-compatible SHA-256 mining while adding drivechain-specific infrastructure.
The result is not simply two competing forks.
It is two very different answers to a broader question:
When developers believe Bitcoin has a structural problem, should the response be to restrict what the base chain permits, or create new places for experimentation outside the base layer?
BIP110 Started as a Restriction on Bitcoin Data
BIP110, formally the Reduced Data Temporary Softfork (RDTS), was proposed as a response to concerns about arbitrary data stored in Bitcoin transactions.
Its rules sought to constrain several forms of transaction data, including limits affecting transaction outputs, OP_RETURN payloads and data pushes.
The proposal was aimed in part at activity associated with Ordinals, inscriptions, BRC-20, Runes and other uses that supporters viewed as unnecessary or harmful consumption of Bitcoin block space.
An unusual feature was that the restrictions were intended to be temporary: the BIP specified an expiration after 52,416 blocks, roughly one year.
The basic idea was therefore subtractive:
reduce the types or quantities of data accepted by the network in order to keep Bitcoin focused more narrowly on monetary transactions.
The controversial part was activation.
The BIP110 deployment used a modified signaling process and, if the required support was not reached, contemplated enforcing nodes rejecting blocks that did not signal the expected rule set.
When enforcement began in August 2026, the supporting chain attracted only a small fraction of Bitcoin's SHA-256 hashpower and stalled after two blocks, according to the chronology reviewed for this update.
The project subsequently changed direction.
The BIP110 Fork Became a Blake2b Network
On September 1, the minority chain restarted with a major technical change: its proof-of-work algorithm was switched from Bitcoin's SHA-256d to Blake2b.
Difficulty was reset and the chain resumed block production.
That change solved one immediate problem. A minority SHA-256 fork inherits a difficult competitive environment because Bitcoin ASIC miners dominate the available SHA-256 hashpower.
Moving to Blake2b created a separate mining ecosystem that could be accessed with commodity CPU and GPU hardware.
But it also made the separation from Bitcoin much clearer.
The resulting network was no longer trying to compete directly for Bitcoin's SHA-256 mining base. It had become an independent proof-of-work chain with different mining hardware economics and a different security environment.
That is the first major distinction from ECX.
ECX Retained Bitcoin-Compatible Proof of Work
ECX took the opposite mining path.
Rather than replace SHA-256, ECX retained Bitcoin-compatible proof of work.
That choice matters because the core technical idea behind ECX is not a new mining algorithm. It is the deployment of BIP300 and BIP301 drivechains.
BIP300 introduces a mechanism for Bitcoin-like sidechains whose deposits and withdrawals are coordinated through miner voting, often described as a hashrate escrow.
BIP301 adds Blind Merged Mining (BMM), allowing miners to collect fees associated with drivechain activity without necessarily running every drivechain's software themselves.
ECX therefore changes the architecture around the base chain rather than replacing its proof-of-work foundation.
Its question is not:
What mining algorithm should replace Bitcoin's?
It is closer to:
Can Bitcoin-style proof of work support multiple optional chains with different rules and applications?
Alpha and Beta exist partly to test that proposition before permanent Mainnet ECX.
Restriction vs Optional Expansion
The deepest difference between the projects is easier to see when their technical goals are placed side by side.
| Area | ECX / BIP300 | BIP110 / Blake2b chain |
|---|---|---|
| Core direction | Add optional drivechains | Restrict certain base-layer data |
| Proof of work | SHA-256 compatible | Blake2b after the fork |
| Experimentation | Move it to sidechains | Reduce selected L1 data use |
| Miner role | Mining plus drivechain/BMM participation | Independent Blake2b mining |
| Sidechain architecture | BIP300/301 drivechains | No equivalent BIP300 system |
| Rollout | Alpha → Beta → Mainnet | BIP110 enforcement → Blake2b restart |
| Network relationship | Separate ECX network with Bitcoin-derived state | Separate Blake2b network |
| BTC-holder concern | Snapshot allocation and safe BTC/ECX separation | Forked-chain coin separation |
This is why describing both simply as "Bitcoin forks" hides much of what makes them interesting.
One project attempts to define a narrower base-chain environment.
The other attempts to make base-layer disagreement less important by providing optional places for different rules.
BIP300 Changes Where Experimentation Happens
Drivechains are central to understanding ECX.
Under the BIP300 model, applications do not all need to compete for inclusion in the same base-layer rule set.
A privacy-oriented chain could use one set of rules. A high-throughput payment chain could use another. A prediction-market or asset-oriented chain could operate differently again.
Users opt into the chains they want.
The intended benefit is separation of concerns: experimentation can happen without requiring every base-layer participant to adopt every experimental feature.
This does not mean the model is already proven at Bitcoin scale.
ECX Alpha has already demonstrated that enforcers, pools, Blind Merged Mining, drivechain activation and withdrawal mechanisms introduce new integration surfaces that have to be tested carefully.
That is precisely why the ECX rollout uses practice stages before Mainnet.
See ECX Alpha Stress Test: What the Network Has Learned Before Beta for examples of issues discovered during Alpha.
BIP110 Changes What the Base Layer Accepts
BIP110 approached the problem from the other direction.
Instead of providing new execution environments, it attempted to modify the rules governing data accepted by the base chain.
Supporters argued that arbitrary data embedding can increase blockchain storage requirements, distort fee incentives and force node operators to store material unrelated to Bitcoin's monetary purpose.
Critics argued that consensus-level filtering risks turning disputes about legitimate transactions into protocol rules and that determined users may find alternative ways to encode data.
Those arguments are broader than the later Blake2b chain itself.
They represent a recurring Bitcoin governance question:
Should Bitcoin consensus decide which economically valid uses of block space are acceptable?
BIP300 tries to reduce the importance of that question by giving users additional opt-in environments.
Whether drivechains can accomplish that goal reliably is a separate technical question — and one ECX is now attempting to test.
The Miner Relationship Is Fundamentally Different
Mining provides another useful contrast.
The original BIP110 activation strategy depended on enforcing nodes adopting rules that miners would then need to follow for their blocks to remain accepted by those nodes.
When only limited hashpower followed the enforcing chain, block production stalled.
The later Blake2b restart solved that problem by creating a mining environment independent of Bitcoin SHA-256 ASIC competition.
ECX instead places miners directly inside the drivechain design.
Under BIP300, miners participate in the withdrawal process through hashrate voting. Under BIP301, BMM is intended to give miners access to fees generated by drivechains.
That creates its own coordination requirements.
Miners and pools must correctly integrate ECX-specific infrastructure, and Alpha has already shown that this integration is not automatic.
So neither approach eliminates the mining question.
They answer it differently.
BIP110/Blake2b separates from Bitcoin's mining ecosystem. ECX attempts to preserve compatibility with it while asking miners to support additional drivechain functions.
Replay Protection Matters for BTC Holders
For Bitcoin holders, philosophical differences are secondary to one practical issue:
coins on two networks must be separated safely.
ECX includes an opt-in replay-protection mechanism designed to make transactions distinguishable between Bitcoin and ECX.
The mechanism described for ECX uses a special nLockTime value that is treated differently across the two networks, allowing a transaction to be valid in the intended ECX context without being immediately valid on Bitcoin.
This matters because a fork does not mean BTC is converted into ECX.
BTC remains on Bitcoin. ECX exists separately on the ECX network.
Users should therefore understand replay protection and coin separation before handling forked assets.
For more detail, see ECX Replay Protection Explained and the Claim eCash security guidance before using private wallet credentials.
ECX Also Uses a Staged Launch
Another major structural difference is the ECX rollout itself.
ECX is being introduced through:
Alpha → Beta → Mainnet
Alpha and Beta are practice stages. Mainnet is the permanent ECX network.
This means observations about Alpha — including balances, mining rewards, bugs and network incidents — should not be confused with permanent Mainnet ECX.
The staged process gives miners, wallet developers, infrastructure providers and users opportunities to test the system before permanent balances are involved.
For Bitcoin holders, the distinction is particularly important when checking an ECX allocation.
Read ECX Alpha vs Beta vs Mainnet: Which ECX Is Real? for the network-stage comparison.
Two Forks, Two Different Technical Bets
It is tempting to reduce the comparison to a question of which chain is "better."
That is not especially useful.
The projects are making different technical bets.
The Blake2b chain bets that a smaller, more restrictive Bitcoin-derived network with accessible CPU/GPU mining can sustain a community that prefers those rules.
ECX bets that Bitcoin-compatible proof of work combined with BIP300/301 can support a network where experimentation moves into optional drivechains.
Both approaches create trade-offs.
Blake2b gains independence from Bitcoin's ASIC mining environment but also gives up SHA-256 compatibility.
ECX retains SHA-256 compatibility and gains a framework for drivechains, but introduces additional infrastructure and miner-coordination requirements that must work reliably.
Those differences are more informative than the fact that both projects began with Bitcoin state.
What Bitcoin Holders Should Take Away
For BTC holders following ECX, four points matter most.
First, ECX and BIP110 are not variations of the same fork design. Their objectives, mining architectures and approaches to experimentation differ substantially.
Second, ECX's defining feature is BIP300/301, not simply the creation of another Bitcoin-derived coin.
Third, ECX Alpha and Beta are test stages. Permanent ECX belongs to Mainnet, so test-network behavior should not be treated as Mainnet behavior.
Fourth, owning BTC at a relevant snapshot and safely accessing forked coins are separate questions. Checking a public address does not require exposing a recovery phrase or private key.
The comparison ultimately illustrates why the term Bitcoin fork is too broad to explain what a network actually changes.
BIP110 began by asking Bitcoin to accept less.
The Blake2b network then moved toward an independent mining ecosystem.
ECX is attempting something different: keep a Bitcoin-compatible proof-of-work foundation while creating optional drivechains where additional functionality can live.
Whether either approach succeeds will be determined by adoption and operation over time.
But technically, the paths are already clearly different.