Crypto news

Adam Back, the creator of Hashcash and one of the most respected developers in the crypto community, published a short post on social network X, which he jokingly called the "E=mc² formula for Bitcoin." Within hours, the post garnered tens of thousands of views and sparked a wave of analysis in the comments.

The comparison to Einstein's equation is conceptual, not mathematical. Back meant that a single short line can encapsulate the essence of an entire system, much like the famous E=mc² captures the relationship between energy and matter. Let's break down what exactly he encoded and why the community embraced the idea with such enthusiasm.

The Three Pillars of Bitcoin

To understand the formula, no math is needed—just imagine the three pillars on which Bitcoin rests.

• First — computational work. To add a new record to the network, computers worldwide must solve a complex numerical problem through brute force. This is intentionally costly: falsifying history retroactively is expensive because it would require redoing all the work.
• Second — the chain of blocks (blockchain). Records in Bitcoin are not scattered but linked together: each new block references the previous one. This creates a single continuous ledger that cannot be secretly rewritten in the middle. Hence the term "blockchain."
• Third — scheduled coin issuance. New bitcoins appear as a reward to whoever adds the next block. The reward size is predetermined and halves every four years—an event known as the halving. Thus, the total number of coins grows according to a predictable schedule built in from the start.

The genius of Back's formula lies in condensing these three pillars into a single line.

What the Formula Says

The post itself looks like this:

c | { h_(i+1) = H(h_i, c, 50/2^h ₿) } < T

Each symbol represents one of the pillars discussed above.

The letter H is the data "shredder," or hash function. It transforms any set of information into a fixed-length string. h_i and h_(i+1) are the previous and next blocks; the fact that one references the other is the chain itself. The letter c denotes a new block candidate with a list of transactions.

The fraction 50/2^h ₿ is the coin issuance schedule: 50 bitcoins initially, and each halving divides the reward in half. Finally, T is the difficulty target: the computation result must be less than this value, otherwise the block is rejected. The entire line reads as a condition: "find such a block candidate that the result falls below the target."

An important caveat, which Back himself makes: the formula is conceptual, not literal. In real mining, the reward enters the computation indirectly, not directly—through a special coinbase transaction that is folded together with the others into the block's overall "fingerprint." Back omitted these technical layers for elegance and brevity: the line conveys the logic, not the exact machine sequence.

Where the Roots Come From

This formula has a backstory spanning a quarter of a century. Back in the late 1990s, Back invented Hashcash—a system to combat spam. The idea was to force an email sender to perform a small computational task. For a single email, this is negligible, but for a mass spam campaign, it becomes prohibitively expensive.

It was precisely this technique—"prove you did work" (Proof-of-Work, PoW)—that later became the foundation of Bitcoin. But Hashcash had neither a blockchain nor rewards for work. Bitcoin's creator under the pseudonym Satoshi Nakamoto took Back's idea and built the missing pieces: linking records into a chain and adding a coin issuance schedule. Thus, the essence is often described by a simple scheme: work plus chain plus economics equals Bitcoin.

Community Reaction

Under the post, one user shared a detailed infographic that broke down the formula into parts and visually compared Hashcash with Bitcoin. Back publicly praised this analysis.

The episode is notable not for a new discovery, but for a successful attempt to condense Bitcoin's foundation into a single memorable line—understandable to both an engineer and someone without a technical background.

My opinion: Back once again demonstrates that Bitcoin's true complexity lies not in the code, but in the elegance of its design. One line uniting work, chain, and issuance is not just a joke, but a powerful educational tool. It's moments like these that remind us why Bitcoin remains the benchmark of cryptocurrencies: its essence can be explained in a minute, but truly understood over years.