In late April 2024, Bitcoin’s fourth halving slashed the block subsidy from 6.25 to 3.125 BTC. On paper, it was a predictable, even elegant, monetary tightening event. But the numbers that followed told a different story — one of survival, not celebration. Over the next eight weeks, miner revenue collapsed by nearly 40%, pushing several public mining operators to the brink of insolvency. Hashprice, the measure of expected earnings per terahash per day, dropped below $0.05, a level that makes even the most efficient ASICs unprofitable in regions with energy costs above $0.04 per kWh. I watched this unfold from Mexico City, a city that hums with the anxiety of a market that has forgotten how to hope. The data was cold, but the implication was hot: Bitcoin’s decentralization consensus, long hailed as its greatest strength, was quietly hollowing out.
To understand why, we have to revisit the structure of mining itself. Bitcoin’s security relies on a distributed network of nodes and miners, each independently verifying transactions. The theory is beautiful — no single point of failure. But the reality, as I learned during my 2022 audit of failing L1 protocols, is that economic pressure concentrates power. The halving reduced the supply of new coins, but the cost of mining (electricity, hardware, cooling) did not halve. Miners with older, less efficient machines were forced to shut down or sell. Those with access to cheap energy and capital doubled down. Today, three mining pools — Foundry USA, Antpool, and F2Pool — control over 60% of the global hashrate. That is not a theoretical risk; it is a structural vulnerability. If any two of these pools collude, they could theoretically reorganize the blockchain, double-spend, or censor transactions. The “Code is Law” doctrine becomes meaningless when the code is executed by a cartel.
This is not a new argument, but the halving sharpens it. I remember writing about Ethereum Classic’s immutability in 2017, arguing that code must be sovereign. Yet here, the economics of mining are creating a de facto sovereignty of the few. Based on my experience in governance forums, I know that pool operators often claim they act in the network’s best interest. But interest is fungible, and pressure from shareholders or investors can shift priorities. The market’s current optimism — many believe the halving will drive price to $150,000 — ignores this fragility. I have seen bull markets mask systemic risk before. In DeFi Summer 2020, I cautioned about over-collateralization and oracle opacity. People called me a pessimist. Then the oracles failed, and DAO lost its peg. History does not repeat; it forks, and sometimes the fork is a dead end.
Let’s look at the data. From May to July 2024, the Bitcoin network’s hashrate dropped from 650 EH/s to 540 EH/s — a 17% decline. That alone is not alarming, but the distribution is. The top three pools did not lose share; they gained. Foundry USA increased its dominance from 28% to 32% in the same period. Meanwhile, smaller pools like Poolin and ViaBTC saw their share erode. This mirrors what I observed during the 2022 bear market: as liquidity dries up, the strong get stronger, and the weak vanish. The efficiency gap is widening. Miners using Antminer S19s need a hashprice above $0.08 to break even; those with S21s can survive at $0.04. The latter are owned almost exclusively by institutional players with long-term power purchase agreements. The idea that anyone with a computer can participate in securing Bitcoin is now a fantasy. The hardware and capital barriers have turned mining into an industrial oligopoly.
The contrarian angle here is uncomfortable, especially for those who consider Bitcoin the purest form of decentralization. Many will argue that pool centralization does not equal protocol centralization — individual miners can switch pools, and pool operators have limited power over the block content. That argument holds water in theory. But in practice, pool operators can choose which transactions to include, and they can censor. In 2021, F2Pool famously censored transactions from addresses sanctioned by the U.S. Treasury. The pool claimed it was complying with local law. Others followed. The network did not fight back; it accepted. This is the quiet death of neutrality. I have seen this pattern in DAO governance too — the appearance of democracy while a small group holds the keys. We chart the code, but the soul chooses the path. And the path, right now, is leading toward a permissioned Bitcoin.
Does this mean Bitcoin is doomed? No. But it means the narrative must evolve. The halving is not a celebration of monetary purity; it is a stress test that reveals where the structure is weak. The next halving, in 2028, will cut the subsidy to 1.5625 BTC. By then, transaction fees will need to sustain the entire security budget. If fees remain low — because users adopt Layer 2 solutions like Lightning or sidechains — the incentive to mine will crumble. Already, transaction fees account for less than 5% of total miner revenue. The security model is betting on future adoption that may never arrive at the required scale. We are building a fortress on a foundation of promises.
I write this not as a cynic, but as someone who has spent years watching architectures of trust fail. The Ethereum Classic hack, the DeFi collapse, the NFT identity projects that burned out — each taught me that technology does not override human nature. Decentralization is a practice, not a feature. It requires constant vigilance, economic resilience, and a willingness to redesign incentives. The current Bitcoin mining landscape is not a failure, but it is a warning. We must stop treating the halving as a magic ritual and start treating it as a calibration event. Adjustments like changing the proof-of-work algorithm to reduce ASIC advantage, or implementing a dynamic block reward that adjusts to hashrate, are no longer purely academic. They are survival mechanisms.
As I sit in this café in Mexico City, watching the price tickers flicker with the same green numbers as yesterday, I feel the weight of this moment. The market is hungry for a rally, but the data whispers caution. The soul of Bitcoin — its promise of a trustless, borderless ledger — depends on its physical layer being robust against capture. If we ignore the concentration of hashrate, we are not investors; we are gamblers on a rigged table. We chart the code, but the soul chooses the path. Let us choose a path that acknowledges the cracks before the whole structure fractures.
Forward-looking, I see two scenarios. In the first, community pressure and technical innovation push toward mining diversification — small-scale miners form cooperatives, new algorithms emerge, and the hashrate becomes genuinely distributed again. In the second, the oligopoly solidifies, Bitcoin becomes a commodity settled by a few entities, and its value proposition shifts from decentralization to a store of value backed by institutional credibility. Either way, the halving was not the endgame. It was the beginning of a harder conversation. And we must have it, honestly, before the next halving arrives.
