Crypto news

Hashcash creator and one of the most respected cryptographers in the industry, Adam Back, published a short post on social media platform 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, just as 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, you don't need math—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 you would have to redo all the work.
• Second — the chain of blocks (blockchain). Records in Bitcoin are not scattered; they are linked together: each new block references the previous one. This creates a single, continuous ledger that cannot be secretly rewritten in the middle.
• Third — a scheduled coin issuance. New Bitcoins appear as a reward to whoever adds the next block. The reward amount 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 set 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 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 containing 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 a block candidate 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 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 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 an email sender 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 this very technique—"prove you did work" (Proof-of-Work, PoW)—that later became the foundation of Bitcoin. But 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: linked the records into a chain and added the coin issuance schedule. Therefore, the essence is often described with 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.

Expert opinion: Such concise formulations are key to mass adoption. When a complex system fits into a single line, it ceases to be "magic for geeks" and becomes accessible for everyone to understand. Back did for Bitcoin what Einstein did for physics: gave the world an elegant and powerful metaphor.