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Four-year halving cycles

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The four-year halving cycle is the most-cited cyclical framework for Bitcoin price behavior. Every four years the block subsidy halves and miner revenue per block drops by half; historically price has risen substantially in the 12-18 months after each halving, peaked, and drawn down before the next cycle. The four cycles through 2026 — 2011, 2013 (post-first-halving), 2017, 2021, and the 2024-2025 cycle still maturing — all show the broad pattern. The framework has two parts: a descriptive observation (cycles exist with predictable approximate timing) and a causal claim (halvings drive cycles through supply-shock dynamics). The descriptive observation is empirically robust; the causal claim is contested — the Perrenod-Santostasi log-periodic framework treats halvings as time markers on a deeper power-law-with-log-periodic dynamic (the 2021 peak a harmonic, not a fundamental), and adoption-curve frameworks treat halvings as triggers rather than drivers. The 2024-2028 cycle is the decisive test: a peak in late 2025-2026 and trough in 2026-2027 reinforces the framework; a delayed or absent peak gives substantial weight to the log-periodic alternative.

Why this note matters

The four-year halving cycle is the most widely cited cyclical framework in Bitcoin discourse — virtually every analyst engages it. Three reasons it is load-bearing:

  1. Dominant framework for cycle position. Allocation decisions, trading strategy, and cycle-top/bottom estimation all rest implicitly on a position about the four-year cycle.
  2. Empirically observable independent of causal claim. Peaks have appeared roughly four years apart at 2011, 2013, 2017, 2021, with the 2024-2028 cycle in progress.
  3. The standard alternative frameworks measure against. The Perrenod-Santostasi log-periodic framework, on-chain cycle frameworks (James Check, Ryan - On-Chain Mind), and macro-cyclical frameworks all position themselves explicitly relative to the four-year cycle.

The note presents the observed pattern, treats the causal claim substantively, engages the log-periodic alternative, surveys alternative mechanistic accounts, and handles counter-arguments. For the halving mechanism itself, see The halving - Mechanism; this note treats the cycle behavior rather than the supply-schedule mechanics.

The observed cycles

Bitcoin’s four-year cycle pattern, through 2026:

Cycle 1: 2011 peak

  • Bottom: ~$2 (late 2011)
  • Peak: ~$32 (June 2011) — pre-first-halving; arguably not a “true” cycle but the initial price-formation regime
  • Driver: Initial price discovery as Bitcoin moved from pre-monetary curiosity to first sustained market price

This cycle is sometimes excluded from “four-year cycle” analyses because the first halving did not occur until 2012; the 2011 peak preceded any halving event.

Cycle 2: 2013 peak (post-first-halving)

  • First halving: November 2012; subsidy 50 → 25 BTC/block
  • Cycle peak: December 2013 at approximately $1,200
  • Cycle bottom: January 2015 at approximately $200 (~83% drawdown from peak)
  • Approximate timing: peak ~12 months post-halving; bottom ~24 months post-peak

Cycle 3: 2017 peak (post-second-halving)

  • Second halving: July 2016; subsidy 25 → 12.5 BTC/block
  • Cycle peak: December 2017 at approximately $19,500
  • Cycle bottom: December 2018 at approximately $3,200 (~84% drawdown from peak)
  • Approximate timing: peak ~17 months post-halving; bottom ~12 months post-peak

Cycle 4: 2021 peak (post-third-halving)

  • Third halving: May 2020; subsidy 12.5 → 6.25 BTC/block
  • Cycle peak (interpretation 1): April 2021 at approximately $64,000
  • Cycle peak (interpretation 2): November 2021 at approximately $69,000 (after a mid-cycle drawdown)
  • Cycle bottom: November 2022 at approximately $15,500 (~78% drawdown from November peak)
  • Approximate timing: peak(s) ~12-18 months post-halving; bottom ~12 months post-peak

The 2021 cycle’s double-peak structure is itself a substantive feature — the April peak with subsequent ~50% drawdown, then a recovery to the November peak — and is the locus of the Perrenod log-periodic argument (see Counter-arguments).

Cycle 5: 2024-2028 (peak in; cycle ongoing)

  • Fourth halving: April 2024; subsidy 6.25 → 3.125 BTC/block
  • Cycle peak: a new all-time high of ~$124,000 in August 2025 — roughly 16 months after the April-2024 halving, within the standard 12-18-month-post-halving window; the most attenuated top on record (~1.8× the 2021 peak)
  • Trajectory since: a 2026 drawdown (~$63,000 by mid-2026, ~50% off the peak); trough timing unresolved (2026-2027 on the standard schedule), with the next cycle starting 2027-2028
  • Still contested: whether August 2025 was a full-cycle top (the consensus reading) or, per the Perrenod log-periodic framework, the age-16 fundamental peak, and whether the 2026 drawdown has bottomed

The peak arrived on the halving-cycle schedule — a point in the framework’s favor — while the depth and timing of the 2026 trough remain the live empirical test.

The descriptive pattern

Across the four observable cycles (excluding the pre-halving 2011 cycle), several features are consistent:

  • Halving-anchored timing: each cycle’s peak has occurred roughly 12-18 months after the preceding halving
  • Large drawdowns: 75-85% drawdowns from cycle peaks have been the norm
  • Cycle-to-cycle peak progression: each peak has been substantially higher in dollar terms than the prior (consistent with the Power Law trend)
  • Diminishing-returns pattern: each cycle’s peak-to-bottom multiple has been smaller than the prior (see Diminishing returns thesis)
  • Recovery patterns: post-trough recoveries have typically been gradual through the first year, with cycle-acceleration in the second year post-halving

These descriptive features hold across the cycles regardless of the underlying causal claim. The cycles are real in the data even when interpretations vary.

Cycle-positioning frameworks

Several frameworks operationalize cycle-positioning relative to the four-year structure:

  • Months-since-halving timing: how many months have passed since the most recent halving
  • Distance-from-trend (Power Law corridor; see The Power Law model): how far above or below the long-term trend the current price sits
  • On-chain cycle indicators (James Check, Ryan - On-Chain Mind): MVRV, SOPR, NUPL, realized-price ratios as cycle-position diagnostics
  • Cycle-comparison overlays: aligning current cycle to prior cycles at equivalent post-halving timing

The frameworks have varying success across cycles; the post-2024 cycle has been more difficult to position cleanly than prior cycles, which is one of the inputs to the log-periodic critique.

Causal accounts: why might halvings drive cycles?

The descriptive pattern is empirically robust. The causal question — why do halvings produce cycles — has several competing accounts:

Mining-economics / supply-shock account

The argument: Halvings cut miner revenue per block by half. Miners must either reduce operations or sell less Bitcoin to fund operations. The supply of newly-mined Bitcoin reaching exchanges drops materially. Reduced selling pressure plus stable or growing demand produces upward price movement.

Mechanism specifics:

  • Pre-halving: miners produce Bitcoin/day; sell to fund operations; ( to treasury
  • Post-halving: miners produce Bitcoin/day; sell at most (and typically less, as miner financial pressure forces some shutdown)
  • Net effect: newly-mined supply hitting markets cuts by more than half

Empirical support:

  • Miner-flow on-chain data shows reduced selling post-halving in prior cycles
  • Hashrate typically dips post-halving (efficiency-driven shutdowns) before recovering
  • The mechanism is most active in the 6-12 months post-halving, consistent with observed cycle timing

Limitations:

  • Newly-mined supply is a small fraction of daily trading volume (~30-50B+ in daily trading); the marginal supply impact is real but small
  • The mechanism would predict a smooth upward trajectory post-halving, not the observed cycle peak-and-drawdown
  • The mechanism becomes weaker each cycle as block-subsidy issuance becomes a smaller fraction of circulating supply

Narrative / speculator-cycle account

The argument: Halvings produce attention — media coverage, analyst-publication, retail interest. Increased attention drives speculator entry. Speculator entry drives price up. Price up drives more attention. The reflexive cycle peaks when new-speculator inflow exhausts; the subsequent drawdown unwinds the reflexivity.

Mechanism specifics:

  • Pre-halving: media coverage builds anticipating the supply-cut event
  • Halving: substantial coverage of the event itself
  • Post-halving: cycle-comparison narratives (comparing to prior cycles’ post-halving appreciation) drive speculative inflows
  • Cycle peak: speculation exhausts as new inflow can’t sustain price
  • Drawdown: forced-selling cascades from leveraged positions; sentiment unwinds

Empirical support:

  • Search-volume and media-coverage data show halving-anchored peaks
  • Retail-investor inflows (exchange opening data, retail-broker reports) cluster in late-cycle phases
  • Sentiment indicators (Fear and Greed Index) peak with cycle peaks

Limitations:

  • “Narrative cycles” can produce cycles in any direction; doesn’t fully predict the specific four-year timing
  • Tautological risk: any observed cycle can be retroactively attributed to “narrative dynamics”
  • Doesn’t predict cycle magnitude rigorously

Adoption-dynamics account

The argument: Halvings are time markers in a broader adoption-driven trajectory. The four-year cycle reflects the natural timescale at which Bitcoin’s adoption ratchets — each cycle adds users, infrastructure, and institutional integration; the cycle’s peak reflects the saturation point of the marginal new-user cohort; the cycle’s bottom reflects the consolidation phase before the next cohort enters.

Mechanism specifics:

  • Pre-halving: gradual adoption builds infrastructure for the next cohort
  • Halving: triggers cycle-narrative that motivates the next adoption wave
  • Post-halving: new-cohort inflows drive price appreciation
  • Cycle peak: new-cohort marginal-buyer exhausts
  • Drawdown: cohort settles; new infrastructure builds for next cycle
  • Next halving: next cohort enters

Empirical support:

  • Each cycle has been characterized by a specific new-user-cohort (2013 retail, 2017 broader retail + first institutional, 2021 broader institutional + new retail, 2024 ETF-driven institutional + sovereign)
  • Adoption-curve dynamics (see Adoption curves) are consistent with cycle-by-cycle cohort progression
  • Cycle peaks have coincided with cohort-saturation events (2017 first retail exhaustion; 2021 first institutional cycle exhaustion)

Limitations:

  • Why specifically four years? The adoption-cohort timing could be longer or shorter than the halving schedule
  • The halving-as-time-marker view doesn’t fully explain why the cycles are as cleanly four-year as they are
  • The 2024 ETF cycle has different cohort-mechanics than prior cycles, weakening the model’s recurrence assumption

The log-periodic alternative (Perrenod-Santostasi)

The argument: The four-year cycle is itself an artifact of a deeper log-periodic dynamic. Bitcoin’s price oscillates around the Power Law trend with discrete scale invariance — fundamental cycles when Bitcoin’s age doubles (factor ), with harmonics at spacing. This produces:

  • Fundamental cycles at ages ~1, 2, 4, 8, 16 years (2010, 2011, 2013, 2017, 2025-2028 expected)
  • Harmonics at intermediate ages — including a harmonic at age ~12 years, which corresponds to 2021
  • The 2021 peak in this framework is a harmonic, not a fundamental — explaining why it was followed by an unusually deep drawdown and an extended consolidation

For the four-year-cycle framework, this is a substantial critique:

  • It explains the observed cycles without requiring halvings as causal drivers
  • It correctly distinguishes the 2021 peak (harmonic) from the 2013 and 2017 peaks (fundamentals)
  • It predicts the next fundamental peak in the mid-2028 timeframe rather than the late-2025/2026 timeframe the four-year cycle would suggest

See Log-periodic cycles and the Perrenod-Santostasi wave model for the full framework. The log-periodic critique is the most analytically substantive challenge to the four-year cycle’s status as the master cyclical framework.

Empirical assessment: how good is the framework?

Honest assessment of the four-year cycle’s empirical track record:

What it gets right:

  • Cycle existence — Bitcoin’s price has cycled with peaks roughly four years apart through 2024
  • Approximate timing — cycle peaks have appeared 12-18 months post-halving consistently
  • Large drawdowns — substantial peak-to-trough multiples have characterized every cycle
  • Diminishing returns pattern — each cycle’s percentage gain has been smaller than the prior, consistent with the framework’s natural prediction

What it has not gotten right (or has gotten partially right):

  • The 2021 double-peak — the framework didn’t anticipate the April-then-November dual-peak structure; the framework typically expects a single cycle peak
  • The 2022 drawdown timing and depth — the drawdown to $15.5K was deeper and longer than prior cycle drawdowns expressed as Power-Law deviations
  • The post-2024 trajectory — early in the 2024-2028 cycle, but post-halving timing has been less clean than prior cycles; the institutional and ETF-driven dynamics produce different inflow patterns
  • Specific magnitude predictions — the framework gives no rigorous prediction of cycle-peak magnitude; that is left to other frameworks (Power Law, S2F, on-chain)

What it cannot do:

  • Predict the exact cycle-peak timing — the 12-18 month range is wide
  • Predict the exact cycle-peak price — no built-in magnitude model
  • Predict cycle bottom-out — the drawdown depth and timing have varied
  • Predict cycle structure inside the cycle — the 2021 double-peak example shows the within-cycle dynamics can deviate substantially from naive cycle-comparison models

The framework is best understood as a rough scaffolding for cycle-thinking rather than as a rigorous predictive model. Used alongside Power Law trajectory analysis, log-periodic structure, on-chain cycle indicators, and macro-cyclical frameworks, it provides one input among several.

Implications for allocation and trading

Allocation implications under the four-year cycle framework (see Portfolio approaches to Bitcoin):

  • Cycle-aware accumulation: accumulation during cycle troughs (12-24 months post-prior-peak) is the framework’s clearest practical recommendation
  • Cycle-aware distribution (contested): partial distribution during cycle peaks (12-18 months post-halving) is operationally possible but timing-execution-risky
  • DCA through cycles: dollar-cost averaging captures the long-term trend regardless of cycle timing; framework-compatible with Adoption curves and Power Law
  • Long-horizon holding: the cycle structure is irrelevant for holding-period horizons > 4-5 years

The framework’s implications are consistent with the broader pragmatic-maximalist allocation framework (see Portfolio approaches to Bitcoin) but should be paired with explicit awareness that:

  1. The cycle-top timing is uncertain — the 12-18 month post-halving range is too wide for high-confidence trading
  2. Cycle-top distribution is execution-risky — selling near peaks requires conviction the framework holds; selling too early forgoes substantial appreciation
  3. The framework may be in regime change — institutional dynamics may produce smoother trajectories with less cyclical structure going forward

The conservative reading: use the framework for accumulation guidance; treat cycle-top distribution as a tactical decision with substantial risk; default to long-horizon holding.

Counter-arguments and tensions

The Perrenod-Santostasi log-periodic critique

The argument: The four-year cycle is not the master cycle. Bitcoin’s price oscillates around the Power Law trend with log-periodic structure: fundamental cycles at age-doubling intervals (~1, 2, 4, 8, 16 years), with harmonics at intermediate ages. The 2021 peak was a harmonic at age ~12 years, not a fundamental — explaining its anomalous post-peak drawdown. The next fundamental peak is projected for mid-2028 (age ~19.5 years), not late 2025/2026 as the four-year cycle would predict.

Response: This is the most substantive critique and is, on its terms, well-supported. The log-periodic framework explains the 2021 double-peak structure and post-2021 deep drawdown more cleanly than the naive four-year framework. The empirical resolution will come in the 2025-2028 window:

  • If a cycle peak appears in late 2025 or 2026, the four-year framework is reinforced (with the 2021 peak as anomaly to be explained)
  • If no cycle peak appears until mid-2028, the log-periodic framework is reinforced (and the four-year cycle is downgraded to “harmonic-influenced timing”)

The honest reading: the log-periodic framework should be taken seriously as the more general alternative, with the four-year framework as a special case that may or may not apply going forward. See Log-periodic cycles and the Perrenod-Santostasi wave model.

Halvings have decreasing marginal supply impact

The argument: Each halving cuts newly-mined Bitcoin supply by 50%, but the fraction of circulating supply represented by newly-mined Bitcoin shrinks each cycle. At the first halving (2012), newly-mined Bitcoin was ~12% of annual circulating supply; at the fourth halving (2024), it is ~0.8%. The mining-economics / supply-shock mechanism therefore weakens cycle-by-cycle; the framework should predict cycle-amplitude attenuation that may eventually break the cyclical pattern entirely.

Response: Mechanistically correct, and consistent with the diminishing-returns pattern observed across cycles. The framework’s predictive content does weaken cycle-by-cycle. The honest reading is that the four-year cycle was strongest in early cycles (when halvings had material supply impact) and is weakening as Bitcoin matures. The 2024-2028 cycle is the test: if the cycle structure remains visible, halvings may be triggering narrative/adoption dynamics rather than supply-shock dynamics; if it dissipates, the framework is in late-stage breakdown.

Institutional adoption may smooth cycles

The argument: Bitcoin’s pre-2024 cycles were retail-driven, with sharp narrative-and-leverage dynamics producing sharp peaks and troughs. Post-2024 institutional adoption (ETFs, sovereign holders, corporate treasuries) produces smoother capital flows that may attenuate or eliminate the cyclical structure entirely. The four-year cycle may not survive Bitcoin’s institutional transition.

Response: Plausible and partially evident in the 2024-2026 data so far. Institutional flows are smoother than retail flows; ETF mechanics in particular produce more measured capital deployment. However, the institutional cohort itself may behave cyclically (allocation decisions clustering around macro environments, regulatory milestones, sentiment shifts), so cyclical structure may persist with different cohort-mechanics. The framework’s specific four-year periodicity may attenuate while broader cyclical structure persists. The honest reading: continue to expect cycles, but expect them to look different.

The 2021 double-peak is hard to fit

The argument: The 2021 cycle had two peaks (April at 69K) with a substantial mid-cycle drawdown (~50%). This structure doesn’t fit the standard single-cycle-peak framework. Either the 2021 cycle had two cycles within four years (breaking the four-year periodicity) or the framework’s predictive content is weaker than its proponents claim.

Response: Real anomaly. The Perrenod log-periodic framework handles this elegantly (the April peak is a harmonic; the November peak is also a harmonic). The four-year cycle framework requires ad-hoc handling — either calling one of the peaks the “true” peak and the other a secondary oscillation, or accepting that cycles can have multi-peak structure. The framework’s coherence is weaker under the multi-peak case.

Sample size of 4 cycles is small

The argument: We have at most four halving cycles observable (2012, 2016, 2020, 2024). Statistical inference from a sample of 4 is fundamentally weak. Apparent patterns may be coincidental rather than structural. The framework is being asked to do too much with too little data.

Response: Fair statistical critique. The four-cycle observation supports a suggestive pattern, not a rigorous statistical model. The framework’s persistence depends on the next cycle continuing to fit. If 2024-2028 doesn’t fit, the framework is largely falsified; if it does, the sample size grows to 5 — still small for statistical confidence but stronger qualitative evidence.

Halvings are time markers, not causal drivers

The argument: Even granting the cycles exist, the halvings may be incidental rather than causal. The cycles may reflect underlying adoption dynamics, macro cycles, or sentiment cycles that happen to align approximately with the four-year halving schedule. The halvings are then marketing/narrative anchors rather than supply-shock drivers.

Response: Plausible and consistent with the adoption-dynamics account discussed above. The strongest reading is that halvings trigger cycle-narratives that catalyze underlying adoption-dynamics; the halvings are not pure supply-shock drivers but also not pure incidental time markers. The framework is then less about halvings specifically and more about Bitcoin’s four-year-ish underlying cyclicality. See the adoption-dynamics account.

Within-Bitcoin: harmful expectation anchoring

The argument: The four-year cycle framework has anchored Bitcoin investor expectations on specific timing and magnitude predictions that have caused substantial harm — buying near peaks expecting further appreciation; holding through troughs expecting “definite” next-cycle recovery; selling at suboptimal points. The framework’s pedagogical role has been ambiguous.

Response: Fair as a cultural critique. The framework’s analytical validity is separable from how it has been used culturally. Going forward, presenting the framework with explicit epistemic humility — and pairing it with log-periodic and adoption-curve alternatives — produces more honest expectation-setting than relying on the four-year cycle alone.

Open questions for further development

  • Will the 2024-2028 cycle complete cleanly with a peak in late 2025 or 2026? This is the live empirical test of the framework.
  • Is the framework being attenuated by Bitcoin’s institutional transition? If institutional flows smooth retail-driven cycle dynamics, what shape will future cycles take?
  • How should the framework reconcile with the log-periodic alternative? The two frameworks make different predictions about 2025-2028 specifically; the next 2-3 years will resolve which fits better.
  • What is the mechanism behind the four-year cycle if halvings have diminishing marginal supply impact? Is it adoption dynamics, narrative dynamics, macro dynamics, or some combination?
  • How does the framework integrate with on-chain cycle indicators (James Check, Ryan - On-Chain Mind)? On-chain indicators may provide higher-resolution cycle-positioning than calendar timing alone.
  • Does the framework have implications for cycle-bottom timing or only for cycle-peak timing? The four-year cycle is primarily cited for peak-prediction; trough prediction is less developed.
  • How does the framework engage Lyn Alden’s macro-cycle framework? If macro-cycles dominate Bitcoin’s mid-term price dynamics (Bitcoin and global liquidity), the four-year halving cycle may be a sub-pattern of a broader macro-driven cycle structure.

Canonical sources for this note

Foundational analytical work

  • Plan B, original S2F articles (2019, 2020) — though now critically engaged, Plan B’s work substantially anchored the four-year-cycle framework in Bitcoin discourse
  • Pantera Capital research letters — early institutional articulation of the four-year cycle as investment framework
  • Various Bitcoin Magazine and analyst-publication treatments through 2017-2025

Halving-mechanism foundations

  • Bitcoin source code (GetBlockSubsidy() in validation.cpp) — the halving schedule
  • The halving - Mechanism (in this discussion) — the supply-schedule treatment
  • Various Glassnode and Coin Metrics reports on miner-flow dynamics around halvings

Alternative cyclical frameworks (engaged critically)

On-chain cycle frameworks

  • James Check / Checkonchain, various cycle-positioning frameworks — see James Check
  • Ryan - On-Chain Mind, video-format cycle analyses — see Ryan - On-Chain Mind
  • Various Glassnode cycle-indicator reports

Macro-cyclical framings

Graph View

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