Every four years or so, the crypto world stops to watch a single automated event: the bitcoin halving, the moment the network cuts the production rate of new bitcoin in half. No committee votes on it, no central bank announces it, no one can delay it. It is a rule written into the software in 2009, executing on schedule ever since.

The halving matters to Filipino holders for a simple reason: it is the supply side of the price equation, and the price you ultimately care about, BTC/PHP, is built on top of it. It is also the most mythologized event in crypto, credited with magical powers it does not have. This explainer covers the mechanics, the actual record from 2012 to 2024, the supply arithmetic, the peso translation, and, just as important, what the halving does not guarantee. For the broader market context, start with our complete guide to crypto in the Philippines.

What Exactly Happens at a Halving?

Bitcoin's network is maintained by miners: operators running specialized computers that bundle transactions into blocks, roughly one block every 10 minutes. For each block, the winning miner collects a reward of newly created bitcoin. That reward is the only way new bitcoin ever comes into existence.

The protocol cuts this reward in half every 210,000 blocks, which at 10 minutes per block works out to approximately every four years. The original reward in 2009 was 50 BTC per block. After four halvings, it stands at 3.125 BTC. The next halving, expected in 2028, will cut it to 1.5625 BTC.

The immediate, mechanical consequence: the flow of new bitcoin onto the market drops by half overnight. At 3.125 BTC per block and roughly 144 blocks per day, the network currently issues about 450 BTC per day, versus about 900 BTC per day before April 2024. At a price of $105,000.00, that is roughly $47 million of new daily supply instead of $94 million, new coins that miners, who have electricity bills to pay, historically tend to sell.

Demand staying equal, a halving of new supply is a structural tightening. Whether demand stays equal is, of course, the entire question.

The Record: Four Halvings, Four Cycles

The historical pattern is the reason the halving has a fan club. Each of the four halvings has been followed, within roughly 12 to 18 months, by a major bull market and a new all-time high. The honest version of the table also shows something the fan club mentions less: the multiples are shrinking every cycle.

| Halving | Date | Reward change | Price at halving (approx.) | Cycle peak (approx.) | Multiple to peak | |---|---|---|---|---|---| | 1st | November 28, 2012 | 50 to 25 BTC | $12 | $1,150 (Nov 2013) | ~95x | | 2nd | July 9, 2016 | 25 to 12.5 BTC | $650 | $19,700 (Dec 2017) | ~30x | | 3rd | May 11, 2020 | 12.5 to 6.25 BTC | $8,600 | $69,000 (Nov 2021) | ~8x | | 4th | April 20, 2024 | 6.25 to 3.125 BTC | $64,000 | Cycle still maturing | Far smaller |

Three observations keep this table honest.

The multiples decay. From roughly 95x to 30x to 8x, each cycle's gain has been a fraction of the previous one. The arithmetic behind the decay is straightforward: bitcoin's market value is now measured in trillions of pesos, and moving a large market requires vastly more new money than moving a small one. Anyone extrapolating 2013-style returns onto today's bitcoin is reading the first row of the table and ignoring the trend across rows.

Each peak was followed by a brutal drawdown. The 2013 peak preceded an 85% decline, 2017 preceded 84%, 2021 preceded 77%. The halving cycle, if it exists as a tradable pattern, has historically included both halves of the wave.

Four data points is not a law. Four observations cannot statistically separate the halving's effect from everything else that happened in those years: the 2020 to 2021 period coincided with unprecedented global monetary stimulus, and the 2024 cycle coincided with US spot ETF approvals that opened institutional demand. Correlation across four overlapping events is suggestive, not conclusive.

The Supply Math: Why 21 Million Is the Point

The halving is one half of a larger design: bitcoin's fixed total supply of 21,000,000 coins. The geometric series of halvings (50 + 25 + 12.5 + ... per block era, times 210,000 blocks) converges to that cap. As of 2026, roughly 19.9 million BTC, about 94.5% of all bitcoin that will ever exist, has already been mined. The remaining 5.5% will trickle out over more than a century, with the last fraction expected around the year 2140.

This is the deeper significance of the halving for a Filipino reader, because it makes bitcoin the structural opposite of the currencies in your life. The peso's supply is managed by the Bangko Sentral ng Pilipinas according to policy goals; the dollar's by the Federal Reserve. Both can be, and are, expanded. Bitcoin's issuance schedule cannot be expanded by anyone, which is precisely the property that attracts savers in economies where currency debasement is a lived experience.

One number worth knowing: after the 2024 halving, bitcoin's annual issuance rate fell to roughly 0.85% of existing supply per year. For comparison, the global stock of gold grows by roughly 1.5% to 2.0% per year through mining. By that single metric, new supply relative to existing supply, bitcoin became scarcer than gold in 2024, and the 2028 halving will roughly halve that figure again.

What Does the Halving Mean for the Price in Pesos?

Here the supply story meets the arithmetic every Filipino holder lives with:

BTC/PHP = BTC/USD × USD/PHP

The halving operates entirely on the first term. It says nothing about the second, and the second is not a footnote. The peso has spent most of the past decade gradually depreciating against the dollar, which adds a structural tailwind to peso-denominated bitcoin returns, and occasionally strengthening, which subtracts one. A post-halving rally in dollars can be amplified or partially offset by the exchange rate before it reaches your peso balance. At $105,000.00 and ₱58.20 per dollar, one bitcoin is roughly ₱6,111,000; the same dollar price at ₱56.00 is ₱5,880,000, a 3.8% difference with bitcoin itself unchanged. The mechanics of that second engine are unpacked in our BTC to PHP price drivers guide.

The practical implication is about expectations, not tactics. If the historical pattern rhymes again, the window 12 to 18 months after a halving has been where peaks formed, and the window after the peak has been where 70%-plus drawdowns lived. A holder who knows both halves of that sentence sizes positions they can hold through the second half. A holder who knows only the first half becomes a forced seller at the bottom.

What the Halving Does NOT Guarantee

This section is the one to reread before acting on anything above.

  • It does not guarantee a rally. Supply is one blade of the scissors. If demand falls, through a global recession, a regulatory shock, or simple exhaustion, the price can fall after a halving, and within each past cycle there were drawdowns of 30% or more even on the way to the peak.
  • It is not a date you can trade. The halving is the most publicized event in crypto, known years in advance. Markets price known information early; waiting to buy "on halving day" or sell "at month 14" assumes millions of other participants cannot read the same table you just did.
  • Past cycles do not bind future ones. Four data points, shrinking multiples, and changing market structure (institutional ETF flows now dominate marginal demand) mean the next cycle can break the pattern in either direction.
  • It says nothing about the peso leg. A BSP rate cycle, a remittance surge, or dollar strength can move your BTC/PHP balance materially in either direction, halving or no halving.
  • It does not protect you from yourself. The halving narrative has historically peaked alongside the price, with social media certainty loudest at the top. The pattern most reliably repeated across all four cycles is retail buying the late rally and selling the subsequent crash.

FAQ: The Bitcoin Halving

Kailan ang susunod na bitcoin halving? Around April 2028, at block 1,050,000, when the reward drops from 3.125 to 1.5625 BTC. The exact date shifts with block production speed, so treat any specific day as an estimate until a few weeks out.

Does the price always go up after a halving? It has, eventually, in all four cases so far, but with shrinking multiples, multi-month delays, and deep crashes along the way. Four instances under wildly different macro conditions is a pattern, not a law, and no serious analyst treats it as guaranteed.

Should I buy bitcoin before a halving? The halving alone is a weak timing signal because it is known years in advance and largely priced in. Position size, time horizon, and your tolerance for 70% drawdowns matter far more than calendar proximity to the event.

What happens to miners when rewards keep halving? Their block revenue halves overnight, which historically squeezes out inefficient operators and concentrates mining among those with the cheapest power. Long term, the network's design expects transaction fees to gradually replace the shrinking block subsidy.

Regulatory note

The halving is a property of the bitcoin protocol and involves no regulator, but buying, selling, and holding bitcoin in the Philippines does. Crypto exchange services may lawfully be offered only by Virtual Asset Service Providers licensed by the Bangko Sentral ng Pilipinas under Circular 1108 (2021); the Securities and Exchange Commission publishes advisories against unregistered platforms, several of which (including Binance, eToro, and OctaFX) are blocked by order of the National Telecommunications Commission. Gains realized from selling bitcoin are taxable as ordinary income under the National Internal Revenue Code, and the Bureau of Internal Revenue expects records of acquisition and disposal values in pesos. This article is informational, is not investment advice, and does not endorse circumventing access restrictions imposed by Philippine authorities.