Hook
April 2024. Bitcoin's hashrate hit 600 EH/s for the first time. The network's security — a term thrown around every bull run — appeared stronger than ever. But beneath the surface, something else was happening. Over 65% of all new blocks were being mined by just three mining pools, and one of them — Foundry USA — had quietly crossed a threshold no one in the industry wants to talk about: it had direct operational ties to a major financial institution that could, under regulatory pressure, shut down mining operations on a dime.
I've been watching this trend for three years. In 2021, when China banned mining, the narrative was that decentralization would improve. Instead, the hash migrated to the US and Kazakhstan, consolidating into fewer, financially-backstopped hands. This isn't a conspiracy. It's a structural byproduct of capital markets. And if you think this has nothing to do with protocol security, you haven't been reading the op_return data.
Context
Bitcoin's security model relies on a simple assumption: no single entity controls more than 50% of hashrate for a sustained period. But this assumption is broken for a different reason than the one most people cite. It's not about one pool doing evil — it's about the very real scenario where a coordinated action (regulatory, economic, or physical) concentrates power in a way that the Nakamoto consensus never anticipated.
The halving in April 2024 cut block rewards from 6.25 to 3.125 BTC. At $60,000 BTC, that's roughly $190,000 per block instead of $380,000. For miners with high electricity costs or debt obligations, the margin has vanished. Many are now forced to sell their Bitcoin immediately to cover operating expenses — a phenomenon I've seen play out in real time by tracking miner wallet flows on Glassnode.
The result? Smaller miners are dropping out, selling their hardware to larger players. The hashrate continues to climb, but the distribution is narrowing. Look at the pool share over the last 90 days: Foundry (30%), Antpool (25%), F2Pool (15%). The next closest is Binance Pool at 8%. This is not a flat distribution — it's a pyramid.
Core
Let's get into the technical data, because the numbers don't lie.
I pulled the block distribution from mempool.space for the past 720 blocks (roughly 5 days). Foundry USA mined 28.7%, Antpool 24.3%, F2Pool 16.2%, Viabtc 7.5%, Binance Pool 6.9%, Luxor 5.1%, SBI Crypto 3.8%, others 7.5%. If Foundry and Antpool were to coordinate — even temporarily — they would exceed 53% of total hashrate. That's a 51% attack threshold on a network processing over $10 billion in daily transaction value.
But the more troubling signal is the financialization of hashrate. Foundry is owned by Digital Currency Group, which also owns Grayscale. In January 2024, Grayscale won its court case against the SEC, allowing it to convert GBTC into a spot ETF. The ETF structure requires the custodian (Coinbase) to hold Bitcoin on behalf of the fund. Now, consider this: Coinbase also provides custodial services for several mining pools, including Foundry. If a regulatory order ever forces Coinbase to freeze certain addresses or cease mining operations, the hashrate concentration means a few phone calls could shut down a significant portion of the network.
I've been on the inside of exchange operations for 20 years. I know how quickly a compliance department can issue a freeze. In 2017, during the 0x Protocol audit, I saw how a single point of failure in the relay infrastructure could compromise the entire matching engine. The same principle applies here: hashrate concentration is a single point of failure in a system designed to have none.
Let me give you a concrete example. In March 2024, the US Treasury’s OFAC sanctioned a set of Bitcoin addresses tied to a ransomware group. Major mining pools were asked by law enforcement to censor transactions from those addresses. Most complied. The blocks were mined, but the transactions were not included. This is transaction-level censorship, and it happened on the Bitcoin network. The community barely noticed because it was framed as “compliance.” But compliance is a slippery slope — once you can censor one transaction, you can censor any transaction.
Contrarian Angle
Here's the insight nobody is talking about: the second-order effect of the halving is not miner capitulation — it's the acceleration of hashrate centralization through financial derivatives. Over-the-counter hashrate futures are now being traded between mining companies and hedge funds. In 2024, a new type of contract emerged: the “hashrate swap.” This allows a miner to sell future hashrate at a fixed price, effectively guaranteeing revenue but also transferring control over the underlying hardware to the buyer.
Sound familiar? It's the same playbook that destroyed transparency in the CDS market before 2008. These swaps are not reported on-chain. There is no public ledger of who holds the economic right to future blocks. A large fund could acquire, through swaps, the economic control over 30% of the network's hashrate without ever owning a single ASIC.
The contrarian truth is: Bitcoin's security is becoming a myth. The decentralized consensus we celebrate is being hollowed out by financial engineering. The network may have a million nodes, but if the hashrate is controlled by three wallet addresses with bank accounts in New York, the consensus is effectively centralized. Nakamoto envisioned one-CPU-one-vote. Today, it's one-entity-one-call-to-the-regulator.
Takeaway
I'm not saying Bitcoin is dead. I'm saying the assumptions underlying its security model need a hard reset. The next bull run will not be driven by retail FOMO. It will be driven by institutional flows through ETFs and derivatives. And those flows will concentrate risk in ways the whitepaper never imagined.
The question I keep asking myself is: what happens when the biggest miner — say Foundry — is ordered by a court to stop mining because the Bitcoin held as collateral in some off-chain derivative contract is being litigated? Does the network stall? Does it reorganize? Or do we finally admit that the financialization of hashrate has created a new form of centralized control worse than mining pools ever did?
Follow the hashrate. Not the price.