The halving and BTC dominance

Two ideas dominate crypto conversation whenever bitcoin is near a peak or a trough: the halving, which is a fact about supply, and dominance, which is a ratio between prices. Both are worth understanding precisely, because both are used to sell you a story.

What the halving is

Bitcoin issues new coins to miners as a reward for each block, about every ten minutes. Every 210,000 blocks, roughly four years, that reward halves. The schedule so far:

(Daily issuance is the reward times about 144 blocks per day.) The next halving is expected around 2028. The reward keeps halving until it rounds to zero around the year 2140, at which point the 21 million cap is reached.

What the halving does, mechanically

Before the fourth halving, miners received about 900 BTC a day and, because their costs are in electricity and hardware paid in fiat, had to sell most of it. After, they received 450. New supply hitting the market fell by 450 BTC a day, which at $60,000 is $27 million a day, or about $10 billion a year of reduced selling.

Set that against daily trading volume in the tens of billions and it is small. The halving's mechanical effect on daily supply is real but modest; its effect on the narrative is enormous.

The "halving cycle" argument, and its weakness

The argument: each halving has been followed, 12 to 18 months later, by a new all-time high, so the halving causes a bull market. The observation is true of the three completed cycles.

The weaknesses:

1. Sample size is three, arguably four. Nothing with three data points is a cycle; it is a coincidence until proven otherwise.
2. It is known in advance. The date is predictable to within days years ahead. Anything that predictable should be priced in by anyone who believes in it, which undermines the cause-and-effect.
3. Each cycle coincided with something else. 2012 to 2013 was crypto's first mainstream attention; 2016 to 2017 was the initial coin offering boom; 2020 to 2021 was unprecedented monetary stimulus during a pandemic. Attributing the rallies to the halving requires ignoring those.
4. Diminishing effect. Each halving removes half as many coins as the last in absolute terms, against a larger and more liquid market.

Key idea: The halving is a known, scheduled halving of new supply that reduces miner selling by a modest amount. The "four-year cycle" built on it rests on three observations and is confounded with macro conditions each time. Know the date; do not trade the story.

Miners after a halving

Halvings do have one reliable effect: miner revenue in coin terms halves overnight. Inefficient miners with high electricity costs become unprofitable unless the price rises, and some shut down, which lowers the network's hash rate for a period. Some sell reserves to survive, which is short-term supply. Historically the network has adjusted within months. For a trader, this is context, not a signal.

BTC dominance

Dominance = bitcoin's market cap ÷ total crypto market cap, expressed as a percentage. It has ranged from above 90% in the early years to below 40% at the height of alt manias.

How it is commonly read:

• Rising dominance: money moving from alts into BTC, or BTC rallying alone. Typical of early bull phases and of fear, when traders retreat to the most liquid asset.
• Falling dominance: alts outperforming BTC. Typical of late bull phases, "alt season", when risk appetite spills into thinner coins.

Alt traders watch it because their whole game is whether alts beat BTC. A falling dominance chart is the environment they want; a rising one means most alts are losing to the benchmark even if they are up in dollars.

Reading dominance correctly

Three things to check before you trust the number:

1. Stablecoins are in the denominator. As stablecoin supply grows, it mechanically pushes BTC dominance down even if no alt moves. Some sites publish "dominance excluding stablecoins"; prefer that version.
2. It is a ratio of prices, not a flow of money. Dominance can fall because BTC drops less than alts rise, or because both fall and alts fall less. It does not tell you money moved anywhere.
3. It lags the thing you care about. By the time dominance has clearly turned, the alt outperformance that caused the turn has already happened.

Used as a regime indicator ("is this an environment where alts have been beating BTC for weeks?"), it is honest. Used as a timing tool, it is a chart of the past.

Try it: Compute daily BTC issuance before and after the 2024 halving (block reward × 144). At a price of your choosing, work out the change in daily dollar supply from miners, then compare it with a day's spot volume on the largest exchange. Then find a dominance chart and mark the last two times it crossed 50%; note what BTC and a major alt each did in the following month.

Recap

• The halving cuts the block reward by half every 210,000 blocks; after April 2024 it is 3.125 BTC, about 450 BTC a day.
• Its mechanical effect is a modest reduction in miner selling; its narrative effect is what moves markets.
• The "four-year cycle" rests on three observations, each confounded by macro events, and the date is known in advance.
• BTC dominance is BTC's share of total crypto market cap; rising means BTC leading, falling means alts leading.
• Check the stablecoin-excluded version and use dominance as a regime description, not a timing signal.