When Bitcoiners talk about bold price calls, one name rises above the rest: Plan B. The pseudonymous Dutch analyst became a crypto legend for a single, deceptively simple idea — that Bitcoin's scarcity, much like gold's, can be measured, modeled, and used to predict where the price is headed next.

Love him or doubt him, Plan B's stock-to-flow framework has shaped how an entire generation of investors thinks about Bitcoin's long-term trajectory. So what exactly is the model, where did it come from, and does it still hold water in today's choppy market?

Who Is Plan B and Why Does the Bitcoin Community Listen?

Plan B is the handle of an anonymous Dutch institutional investor who first gained mainstream attention in March 2019. He published a now-famous Medium article titled "Modeling Bitcoin's Value with Scarcity," arguing that Bitcoin's price could be explained almost entirely by one variable: its stock-to-flow ratio.

Because he was a former central bank and pension fund analyst — a true institutional voice hiding behind a Twitter avatar — the post went viral. Within months, every crypto trader was talking about "S2F," and Plan B became one of the most quoted voices in the space.

From Skepticism to Cult Following

At first, the model's near-perfect historical fit felt almost too good to be true. Critics called it curve-fitting, and a few high-profile misses — most notably in 2022 — gave skeptics fresh ammunition. But Plan B kept iterating, eventually launching a refined version called Bitcoin Stock-to-Flow Cross Asset (S2FX), which attempts to value BTC not just against itself but against gold, silver, and real estate.

How the Bitcoin Stock-to-Flow Model Actually Works

Stock-to-flow (SF) is not a Plan B invention — it's a well-known scarcity metric in commodities markets. It measures how many years' worth of supply is currently in existence relative to new production.

  • Stock = the existing total supply (e.g., all gold ever mined).
  • Flow = the annual new production.

The higher the ratio, the scarcer the asset. Gold sits around 60, silver around 30, and Bitcoin — thanks to its hard-coded halving cycle — has been climbing steadily toward and past those levels.

The Halving Catalyst

Every four years or so, Bitcoin's block reward is cut in half. That event slashes the flow, pushing the SF ratio sharply higher. Plan B's insight was to overlay this mathematical reality onto price history, and the resulting chart produced a jaw-dropping correlation during the 2010s.

"Bitcoin is the first scarce digital object the world has ever seen. It is digital gold." — Plan B, paraphrased from his 2019 paper.

Plan B's Boldest Bitcoin Price Calls

Plan B didn't stop at theory. He published month-by-month price targets that, if hit, would have put Bitcoin into six-figure territory well before most Wall Street analysts dared to predict it.

  • 2020 year-end target: around $55,000 — Bitcoin actually smashed past it.
  • 2021 mid-cycle target: between $100,000 and $288,000 — BTC briefly hit six figures before the 2022 bear market hit.
  • 2024 halving target: a fresh wave of upside tied to the latest supply cut.

Not every call landed on time. The brutal 2022 bear market saw BTC tumble to the high teens, well below Plan B's projected floor. The analyst publicly acknowledged the miss and used the data to refine S2FX.

Criticisms: Where the Model Falls Short

No model is gospel, and Plan B's framework has drawn sharp criticism from academics, quants, and rival analysts.

Curve-fitting risk: With enough variables, you can fit almost any historical price curve. Critics argue S2F leans heavily on hindsight.

Demand is missing: S2F only measures supply. It ignores macro liquidity, regulation, ETF flows, and shifting sentiment — all of which clearly move the Bitcoin price.

Black swan events: Exchange collapses, regulatory crackdowns, and global liquidity crunches can override scarcity logic in the short term.

The 2022 Reality Check

When Terra, Celsius, and FTX imploded in rapid succession, Bitcoin's price decoupled from the model for the first extended period in its history. Plan B responded by saying the model was never meant for short-term trading — a fair point, but one that narrowed its usefulness in the eyes of many traders.

Why the Model Still Matters Going Into the Next Cycle

Despite its flaws, the stock-to-flow framework remains one of the most cited long-term theses in crypto. Each new halving renews the conversation, and with institutional adoption — spot Bitcoin ETFs, corporate treasury buyers, and sovereign discussions — the underlying demand assumption that skeptics once dismissed is no longer fringe.

Plan B himself has continued publishing monthly updates, often reminding followers that the model is a long-horizon tool. The next halving, expected in 2028, will be the real test: if the post-halving trajectory once again tilts toward the model's implied range, Plan B's reputation as Bitcoin's most influential quant will be cemented for good.

Key Takeaways

  • Plan B is a pseudonymous Dutch analyst whose stock-to-flow model helped legitimize Bitcoin as a scarce digital asset.
  • The model links BTC's price to its programmed halving cycle, with stunning historical correlation through 2021.
  • It has missed during deep bear markets and ignores demand-side variables, so it works best as a multi-year compass, not a trading signal.
  • Each new Bitcoin halving revives interest in the framework, making Plan B a permanent fixture in long-term BTC analysis.