Bitcoin, Blake2b, and a new beginning for proof of work

Bitcoin has always been framed as a one-time invention: a fixed monetary protocol that should never change in fundamental ways. But a new proposal is challenging that assumption by suggesting a hard fork that would change Bitcoin’s proof-of-work algorithm, fire the current mining oligopoly, and try to reboot the network’s culture around true decentralization.

Why some Bitcoiners want a hard fork

For years, many Bitcoiners have warned that if mining ever became dangerously centralized or captured by hostile interests, a proof-of-work change might be necessary. The idea was simple: if miners started acting against Bitcoin’s long-term interests, users and node operators could coordinate a hard fork, change the mining algorithm, and leave those miners behind.

That scenario is now being taken seriously by a group of developers and users who believe Bitcoin’s current governance is broken. In their view, large SHA-256 mining pools and corporate interests have too much power, while node operators and everyday users have too little say in the protocol’s future.

The proposed solution is a hard fork that keeps Bitcoin’s history and UTXO set (all existing balances) but changes the proof-of-work algorithm so that current SHA-256 miners can no longer mine on the new chain.

What this new Bitcoin fork keeps — and what it changes

The fork is designed to inherit what many see as Bitcoin’s most important properties:

• Its “immaculate conception” and launch with no pre-mine or centralized issuer
• Its slow, organic distribution over many years
• Its full UTXO set, meaning all existing coins and balances carry over

At the same time, it makes one huge change: switching the proof-of-work algorithm from SHA-256 to Blake2b. This is not meant to create a brand-new altcoin from scratch, but to continue Bitcoin’s history on a different technical and cultural path.

Why Blake2b was chosen as the new proof of work

Blake2b was selected from a shortlist of candidate algorithms based on several criteria:

1. Existing ASIC hardware: There are already Blake2b ASICs on the market. That reduces the risk that one manufacturer gains an overwhelming advantage or that the network is dominated by botnets in the early days.

2. Ease of new ASIC competition: The algorithm is simple enough that new ASIC manufacturers can enter the market over time, helping keep hardware competition alive and reducing centralization risk.

3. Lower risk of hidden optimizations: The goal is to avoid another situation like ASICBoost on SHA-256, where a mathematical trick gave certain miners a secret advantage.

4. Proof-of-work fundamentals: Blake2b remains easy to verify for nodes while still being computationally expensive to mine, preserving the core security model of proof of work.

According to the proposal, the final choice of Blake2b was made after a short period of community discussion and then random selection from a set of acceptable candidates, rather than being unilaterally picked by a single developer.

Technical changes beyond the hashing algorithm

The fork doesn’t just swap SHA-256 for Blake2b. It also reshapes the block header and introduces several technical improvements:

• More nonce space: This gives miners more flexibility when searching for valid blocks.
• Opt-in protection against block withholding attacks: A current vulnerability in Bitcoin mining where pools can sabotage each other is addressed at the protocol level.
• Future-proofing for merge-mined sidechains: The new design is intended to better support sidechains down the road.
• Transaction count commitment: Extra data in the header can make some forms of validation and analysis more efficient.
• Preparation for the 2106 timestamp issue: All Bitcoin branches will eventually need a hard fork to deal with this; the new chain bakes in some groundwork early.
• More efficient ASIC control: The new header format is designed to make life easier for ASIC controllers.

The downsides: what this fork could lose

Even supporters of the fork are open about the risks and trade-offs. Some of the biggest downsides include:

1. Loss of network effects

The existing Bitcoin network has enormous advantages: liquidity, brand recognition, infrastructure, and deep integration across exchanges, wallets, and services. A forked chain will lose much of that overnight.

2. Potential price crash

The new chain’s coin could initially trade at a steep discount, possibly dropping 80–99% from BTC’s price. If large holders or institutions are allowed (or instructed) to dump, the sell pressure could be brutal in the early days.

3. Wallet and hardware support gaps

Most existing wallets and hardware devices won’t support the forked chain at launch. Developers will need to clone or adapt wallets, and users will have to wait for support or use new tools. AI-assisted code generation may speed this up, but it’s still a major hurdle.

4. No Lightning support at first

Lightning Network implementations will not work out of the box. Someone will need to fork or reimplement Lightning for the new chain, which could take time and introduce new bugs and risks.

5. Exchange listing uncertainty

Trading might be clunky at the start. If major exchanges don’t list the forked coin, users will have to rely on peer-to-peer markets or smaller platforms.

6. Social stigma

Anyone supporting the fork should expect to be called a “shitcoiner” by both altcoin traders and many Bitcoiners who view any hard fork as an attack on Bitcoin’s integrity. The social and reputational cost could be high.

These are serious issues, especially for investors focused on price or convenience. For context on how major tests and fractures can shape Bitcoin’s trajectory, it’s worth looking at analyses like why bitcoin is about to face its biggest test yet.

The upside: why supporters see this as a new beginning

Despite the risks, proponents of the fork see a unique opportunity to rebuild Bitcoin’s ecosystem and culture from the ground up. They highlight several potential benefits:

1. Everyone must run a node

At launch, anyone who wants to use the forked chain will need to run their own full node. There won’t be a mature ecosystem of custodial services or lightweight wallets yet. This is seen as a huge win for decentralization and user sovereignty.

2. Low price as a learning sandbox

If the coin trades cheaply at first, users can buy small amounts, experiment with self-custody, and even try mining without risking life-changing sums. That lowers the barrier to entry for builders and tinkerers.

3. Fresh tools and better wallets

With so much infrastructure needing to be rebuilt, there’s an opportunity to design better wallets, node software, and developer tools from day one, avoiding some of the design mistakes and incentives that shaped the current ecosystem.

4. A new Lightning implementation

Lightning clients on Bitcoin today have well-known issues, and some companies are more focused on USD stablecoins than on making Lightning robust for BTC payments. On the forked chain, there’s a chance to build Lightning-style payment layers with fewer compromises and a Bitcoin-first mindset.

5. General-purpose hardware and broader participation

The new ecosystem aims to lean more on widely available hardware and open infrastructure, rather than relying so heavily on a small set of industrial-scale SHA-256 miners and service providers.

6. A more flexible, less centralized mining design

By changing proof of work and redesigning the block header, the fork aims to make mining more efficient, harder to centralize at the hardware level, and easier to evolve in the future if new threats emerge.

7. A reset on spam, scams, and regulatory capture

Supporters expect that many institutional players, speculators, and opportunistic projects won’t bother with the new chain at first. That breathing room could give the community time to build better defenses against spam, scams, and regulatory capture.

8. Stronger P2P markets and privacy

If exchanges don’t list the forked coin, users will be forced to build and use peer-to-peer exchange networks. That could result in better privacy, less KYC, and a more censorship-resistant trading environment.

9. Using Bitcoin as “internet money” again

Above all, supporters want to refocus on Bitcoin as an open, rivalrous digital commodity and internet-native money, not as a corporate-controlled asset backing dollar-like products.

Firing the miners: what actually changes for mining

One of the most radical aspects of this proposal is that it deliberately makes all existing SHA-256 mining hardware useless on the new chain. That includes home miners, industrial farms, and everything in between.

If the fork happens, anyone who wants to mine on the new chain will need Blake2b ASICs or access to rented Blake2b hash rate. There are already signs of available Blake2b hash power and early guides on how to prepare for mining at home or via rental services.

This is meant to send a clear message: miners are service providers to the network, not its rulers. If they act against users’ interests, the users can and will replace them.

Can the new chain avoid the same centralization problems?

A natural concern is whether the new fork will simply repeat Bitcoin’s current issues: mining centralization, large pools dominating block construction, and corporate capture.

Supporters argue that several design choices reduce this risk:

• Firing miners as a precedent: The very first move of the new chain is to fire the existing mining oligopoly. That sets a cultural and practical precedent: if miners misbehave again, they can be fired again.

• Using Datum instead of Stratum: The fork plans to use the Datum protocol for mining coordination rather than Stratum, which is widely blamed for today’s mining centralization. Stratum encouraged miners to outsource block template construction to pools, giving pools outsized power. Datum is designed so miners can pool hash rate while still building their own block templates.

• Plebs as the initial miners: At launch, the expectation is that most miners will be regular users and small operators, not giant industrial farms. That early distribution of hash power could help shape healthier norms and expectations.

Supporters also reject the idea of “ASIC resistance” as a realistic goal. They argue that specialized hardware is fine, as long as the protocol and culture prevent any one group from gaining unchecked control.

Nodes vs miners: who really decides?

A core philosophical point behind the fork is the role of full nodes. On the legacy chain, many users believed that running a node meant they ultimately decided which rules to follow. But in practice, miners and large economic actors have often had the final say.

The new fork aims to flip that dynamic. Its story is that node operators collectively fired the miners by refusing to accept their chain and switching to Blake2b. In this narrative, the “lore” of the new chain is that nodes are in charge and miners are replaceable contractors.

Whether that holds over time will depend on culture, incentives, and future decisions. But the fork’s supporters see this as a rare chance to lock in a precedent that nodes, not miners, are the ultimate guardians of the rules.

Timeline and what happens at the fork

The targeted date for the hard fork is September 1, 2026, assuming the software is ready. At the moment of the fork:

• The new chain will build its first Blake2b block on top of the last block of the BIP110-aligned Bitcoin chain.
• The chain’s history will still trace back to the original Genesis block mined by Satoshi.
• From that point on, SHA-256 miners will no longer be able to produce valid blocks on the new chain.

Supporters will view this forked chain as the “canonical” continuation of Bitcoin’s original vision, even though it won’t have the greatest accumulated proof of work. Critics will see it as an altcoin. The market and the community will ultimately decide how it’s treated.

For readers interested in how this fits into Bitcoin’s broader long-term dynamics, it’s useful to consider analyses of where bitcoin is in its current 4‑year cycle and how structural shifts can affect both price and culture.

Final thoughts

This proposed Bitcoin fork is not a minor upgrade. It’s an attempt to reset who really holds power in the system, how mining works, and what kind of culture Bitcoin should have going forward.

On one side, there are massive risks: loss of network effects, price volatility, fragmentation, and the possibility that the new chain never gains meaningful traction. On the other, there is a chance to build a version of Bitcoin that is more aligned with node sovereignty, decentralization, and everyday users.

Whether you support or oppose the idea, it forces a deeper question: is Bitcoin’s value mainly in its current institutions and infrastructure, or in the principles that made it possible in the first place?