Hook
Grayscale Research published a note claiming Zcash mining now returns roughly double the per-rig revenue of Bitcoin and four times the revenue per megawatt-hour. Days later, ZEC broke $1,000 for the first time in nearly a decade. An ETF called ZCSH listed on August 25 and pulled in more than $500 million inside two weeks. Every headline number pointed the same direction, and the crowd followed the arrow.
Then I ran the arithmetic backward. One column didn't balance.
I have spent years building due-diligence checklists for token sales and auditing whitepapers that never survived contact with a spreadsheet. We do not build in the dark; we audit the light. So let me open the books.
Context
Zcash has run since October 2016 on Equihash, a memory-hard proof-of-work algorithm designed to resist the ASIC monopolization that defines Bitcoin's SHA-256 landscape. The pitch was decentralization through hardware accessibility: GPUs could still compete, and specialized silicon could not fully capture the network. For most of its life, Zcash was a technical curiosity rather than a capital magnet. That changed in weeks.
Nine years later, the design distinction has quietly become an economic border. Equihash hardware cannot mine SHA-256. SHA-256 hardware cannot mine Equihash. A miner holding capital in one ecosystem cannot redeploy it into the other without liquidating equipment and rebuilding a fleet. The two networks do not compete for the same hashrate; they compete for the same electricity and the same investor attention, and nothing else.
That isolation is the origin of the premium Grayscale is now advertising. Bitcoin's SHA-256 hashrate is the largest and most commoditized compute market in the world. Zcash's Equihash hashrate is a rounding error by comparison. When capital cannot move freely between two markets, price dislocations persist — not because one algorithm is superior, but because the arbitrage is physically blocked. Keep that in mind when reading any efficiency claim built on the divide.
Grayscale frames the result as a "self-reinforcing dynamic." That phrase deserves scrutiny, and it will get it.
Core
Start with the ratio check. Per-megawatt-hour revenue equals daily rig revenue divided by rig power draw. If per-rig revenue is 2x Bitcoin's and per-MWh revenue is 4x, then the algebra forces a single conclusion:
4 = 2 ÷ (P_ZEC / P_BTC), which yields P_ZEC / P_BTC = 0.5.
A Zcash rig must draw roughly half the power of a comparable Bitcoin machine for both ratios to hold. ZEC units typically run 1–3 kW; current-generation SHA-256 machines push 3–5 kW and beyond. The numbers are internally consistent, and that is a genuine point in the report's favor. The 2x and 4x are not marketing artifacts — they reconcile.
Now run the issuance backward, and the consistency ends.
Zcash produces a block every 75 seconds, which is 1,152 blocks per day. After the November 2024 halving, the block subsidy sits near 3.125 ZEC. Daily issuance therefore lands close to 3,600 ZEC. At the quoted $1,177, the network mints roughly $4.2 million of new coins every day — not the $2 million the report cites.
If $2 million is accurate, the implied ZEC price is about $550, which is exactly where ZEC traded before its September 4 breakout. Two explanations fit. Either the $2 million figure is a stale snapshot taken before the rally and then mixed with a post-rally price, or it reflects accounting net of the developer fund, which claims roughly 20% of block rewards and would still leave about $3.4 million. Neither explanation closes a gap of that size.
Cross-check the Bitcoin side. Post-halving, Bitcoin issues about 450 BTC per day. The report's $35 million daily reward implies a BTC price near $78,000, excluding fees — a plausible figure. The Bitcoin data holds.
Cross-check market capitalization. ZEC trades at roughly 1% of Bitcoin's value. Against BTC's $1.5 to $1.6 trillion, that places ZEC near $15 to $19 billion. Multiply $1,177 by the circulating supply of about 16.3 million coins and you land at roughly $19 billion. The price is consistent. The reward is not. And the error runs in one direction — toward a stale reward figure.
The ledger remembers what the narrative forgets.
Then there is the mechanism the report skips. Hashrate has grown more than 2.5x year over year. Read that as pressure, not health. Rising hashrate raises difficulty, and difficulty compresses per-unit revenue. At roughly 8% compound monthly growth, the network may already be absorbing more compute than the price can carry — meaning difficulty adjustment is lagging the rally rather than validating it.
The only durable moat is ASIC supply. Equihash silicon capacity is small, and production is concentrated among a few fabs. As long as delivery lags price appreciation, the premium survives. The moment capacity catches up, per-rig revenue converges within one to two quarters. That is the whole trade, stated plainly: a supply-chain lag dressed in algorithmic clothing.
Now size the demand. ZCSH absorbing $500 million in two weeks is roughly $35.7 million per day. Zcash mining issues $2 to $4.2 million daily. ETF inflows run 10 to 18 times the new supply. Price formation is no longer a mining story. It is a fund-flow story wearing mining clothes.
Contrarian
Here is what the bulls will not model.
If ETF inflows dominate marginal pricing, sensitivity is asymmetric. A slowdown does not merely stall the price. It removes the only buyer large enough to absorb the reflexive bid that mining never created. Mining sells; it does not accumulate.
And the "self-reinforcing dynamic" Grayscale describes is, mechanically, self-cannibalizing. High mining revenue attracts hashrate. Hashrate raises difficulty. Difficulty erodes the margin that attracted the capital in the first place. That is not a flywheel. It is a cycle with a known reversal point, and the reversal tends to arrive at the intersection of peak ASIC delivery and flat price.
One more blind spot. Zcash's absolute hashrate is trivial beside the SHA-256 ecosystem, and Equihash remains partially GPU-mineable. Rented hashpower is cheaper than built hashpower. The report never touches attack economics measured in rental markets. That silence is not reassurance. It is an omission.
Takeaway
The Zcash mining premium is real — but it is a supply-chain arbitrage, not an algorithmic triumph. It expires when the fabs deliver, not when the narrative does. Codifying the intangible cuts both ways: you can codify a moat, and you can codify its expiration date.
Watch the difficulty curve against the ETF inflow line. When they cross, the ledger will already have recorded the answer.