Crypto news

Hashcash creator and one of the most respected cryptographers in the Bitcoin world, Adam Back, published a post on social media platform X that 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. This is unsurprising: Back managed to condense the fundamental principles of the first cryptocurrency into one short line.

The comparison to Einstein's equation is conceptual, not mathematical. Back meant that one 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 (Proof-of-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 all the work would have to be redone.
• 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.
• Third — scheduled coin issuance. New bitcoins are created as a reward for 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 embedded from the very beginning.

The genius of Back's formula is that he condensed these three pillars into a single line.

What the Formula Says

The post itself reads: 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 template containing a list of transactions.

The fraction 50/2^h ₿ is the coin issuance schedule: 50 bitcoins at the start, with each halving dividing the reward in half. Finally, T is the difficulty target: the computation result must be less than this value, or the block will not be accepted. The entire line reads as a condition: "find a block template such that the result falls below the target."

An important caveat, which Back himself makes: the formula is conceptual, not literal. In actual mining, the reward does not enter the calculations directly but indirectly—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 sequence of machine operations.

Where the Roots Lie

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 the sender of an email to perform a small amount of computational work. For a single email, this is negligible, but for a million-piece spam campaign, it becomes prohibitively expensive.

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

Back's post is not a new discovery but a successful attempt to distill Bitcoin's foundation into one memorable line, understandable to both an engineer and someone without a technical background. This is exactly what many were missing for an intuitive grasp of the system's brilliant simplicity.

My professional opinion: Moments like these—public "eureka" moments from industry veterans—are far more valuable than yet another price prediction. They remind us that behind the noise and volatility lies an elegant, mathematically precise structure capable of being expressed in a single line. This is the true value of Bitcoin, which the market often overlooks.