Crypto news

One of the most respected developers in the crypto community, the creator of the Hashcash system Adam Back, presented a conceptual "formula" for Bitcoin, which he jokingly called an analogue of Einstein's famous equation E=mc². This is not about a mathematical identity, but about semantic conciseness: a short string capable of capturing the essence of the entire first cryptocurrency — from the consensus mechanism to the emission model. The post instantly garnered tens of thousands of views and sparked heated discussion in professional circles.

Three pillars of Bitcoin in one entry

To appreciate the genius of this string, you don't need to be a mathematician. It's enough to understand the three basic pillars on which Bitcoin rests:

• Computational work (Proof-of-Work). To add a new block, miners around the world solve a complex numerical problem through brute force. This is a deliberately costly process: rewriting transaction history retroactively is economically unviable, as all the work would have to be redone.
• Chain of blocks (blockchain). Records are not chaotic but rigidly linked: each new block references the previous one. The result is a single, continuous ledger that cannot be imperceptibly rewritten in the middle.
• Scheduled emission. New bitcoins appear only as a reward for a found block. The reward size is predetermined and halves every four years (at the time of the halving), ensuring a predictable and deflationary issuance schedule.

The entire genius of Back's formula lies in the fact that he condensed these three pillars into one concise entry:

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

Let's break it down element by element. H is a hash function, a data "shredder" that turns any set of information into a fixed-length string. h_i and h_(i+1) are the previous and next blocks; it is their connection that forms the chain. c is the "template" of the new block with a list of transactions. The fraction 50/2^h ₿ is the emission schedule: 50 BTC at the start and halving with each halving event. Finally, T is the difficulty target: the result of the computation must be less than this threshold, otherwise the block will not be accepted by the network. The entire string reads as a condition: "Find such a block template so that the result falls below the target."

Back emphasizes: the formula is conceptual, not literal. In real mining, the reward enters the computation not directly, but through a special coinbase transaction. He omitted these technical layers for the sake of elegance and brevity — the string conveys the logic, not the exact sequence of machine operations.

Roots: from fighting spam to a global currency

This formula has a backstory spanning a quarter of a century. Back in the late 1990s, Back invented Hashcash — a system for fighting 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 imperceptible, but for a mass mailing of millions, it becomes too expensive. It is 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 a reward for work. Satoshi Nakamoto took Back's idea and built the missing pieces: linked the records into a chain and added a coin issuance schedule. Hence the simple scheme: work plus chain plus economics equals Bitcoin.

Community reaction

Under the post, one user published a detailed infographic that broke down the formula into parts and visually compared Hashcash with Bitcoin. Back publicly praised this analysis. The episode itself is notable: it's not about a new discovery, but about a successful attempt to condense the foundation of Bitcoin into one memorable string — understandable to both an engineer and someone without a technical background.

Expert opinion. This formula is not just a fun analogy, but a powerful pedagogical tool. It demonstrates that Satoshi's genius lay not in inventing new cryptographic primitives, but in elegantly combining existing ideas (Proof-of-Work from Back, the block chain from Haber and Stornetta, economic incentives). The ability to fit all this complexity into one string is a sign of deep system understanding, and I recommend that anyone who wants to understand Bitcoin start with this formula.