Loading article...
Slot ID: blog-post-top
On 10 January 2024, the US Securities and Exchange Commission approved 11 spot bitcoin ETFs. The next morning, shares in BlackRock's iShares Bitcoin Trust, Fidelity's Wise Origin fund and nine others started trading on US exchanges. It was the end of a fight that had been running since the Winklevoss twins first filed in 2013, and it changed who could buy bitcoin and how.
Two years on, the numbers are large enough to be hard to ignore. A handful of these funds now hold more bitcoin than any single entity other than Satoshi's untouched wallets and the largest exchanges. BlackRock's fund crossed $50 billion in assets in under a year, the fastest any ETF has ever got there.
But a bitcoin ETF is not bitcoin, and understanding the gap between the two is where most of the useful information lives.
A spot bitcoin ETF is a wrapper. The fund itself buys physical bitcoin and parks it with a custodian, which for most US issuers is Coinbase Prime. The fund then issues shares that trade on a normal exchange. Each share represents a fractional claim on that pooled bitcoin, minus the fund's fees.
This is different from the futures ETFs that launched in 2021, like ProShares BITO. Those buy CME bitcoin futures contracts and roll them forward each month. In a contango market, where later-dated contracts cost more than spot, rolling bleeds value. Spot funds don't have that problem, which is why the market treated the 2024 approval as a different category of event entirely.
Large institutions called authorised participants create and redeem shares in big blocks, usually 10,000 or 40,000 at a time. When demand spikes, an AP buys bitcoin in the market, hands it to the custodian, and receives new shares to sell. When shares trade below the value of the underlying bitcoin, the process reverses.
That arbitrage mechanism is what keeps the share price within a fraction of a percent of net asset value. In the US, all these creations currently settle in cash rather than in kind, meaning the AP sources the bitcoin itself rather than wiring coins to the fund. It is a small detail with real implications: it makes the funds dependent on a functioning spot market at both ends of the trade.
Buying bitcoin on an exchange has always required a separate account, a separate login, and a decision about whether to self-custody. The ETF collapses all of that into a ticker you can buy in the same place you buy an index fund.
The trade-off is equally concrete: you don't own bitcoin, you own a claim on a trust that owns bitcoin. You can't spend it, send it at 2am, or take delivery. If the custodian fails catastrophically, your claim depends on the legal structure holding up.
When the funds launched, issuers slashed fees on day one and several waived them entirely for the first six to twelve months. The current landscape is roughly this: Franklin's EZBC and Bitwise's BITB sit at or just under 0.20%, BlackRock's IBIT and Fidelity's FBTC charge 0.25%, and Grayscale converted its long-running trust from a 2% fee to 1.5% before launching a lower-cost mini version.
That spread looks trivial and isn't. On a $10,000 position, the difference between 0.19% and 1.5% is about $131 a year, and it compounds against you for as long as you hold. Over a decade, assuming flat returns, the expensive fund has quietly taken more than 13% of your position. Fees are the only part of a bitcoin investment you can predict with certainty.
Daily inflow figures have become a genre of market commentary in their own right. They are worth watching, with caveats. Grayscale's GBTC shed a large chunk of its bitcoin in 2024, but that mostly reflected holders who had been trapped at a discount for years taking the exit, not a verdict on bitcoin's prospects. Meanwhile IBIT absorbed billions and became the story.
Inflows show that a specific group of buyers, largely advisers and allocators who could not previously access the asset, are moving money in. They don't forecast price. Plenty of weeks have seen strong inflows and a falling price, and vice versa. Treat the flow data as a measure of adoption among a particular investor class, not as a signal about next month.
The bigger structural change shows up in the bitcoin market cap conversation, where a meaningful share of the float now sits in regulated, auditable, publicly reported vehicles rather than on exchanges and in private wallets.
Bitcoin trades around the clock. The ETFs don't. That mismatch creates a strange rhythm: weekend price moves get absorbed by the funds on Monday morning, and the CME futures basis trade, where institutions short futures against long ETF exposure, has become one of the largest arbitrage games in crypto.
There is also the correlation question. Since the ETFs launched, bitcoin's price has tracked risk assets like the Nasdaq more closely during stress events, because the same allocators now hold both. When they de-risk, they sell the liquid thing, and the ETF made bitcoin easier to sell in a hurry.
Gold ETFs took four years after their 2004 launch to reach $50 billion in assets. Bitcoin funds got there in months. That comparison is flattering to bitcoin and slightly misleading, because the bitcoin funds launched into an already mature $1 trillion-plus asset with a decade of retail enthusiasm behind it.
Still, the two are answering different questions. As covered in bitcoin versus gold as competing stores of value, gold's case rests on thousands of years of monetary history and a deep physical market, while bitcoin's rests on scarcity, portability and a network that no government controls. The ETF wrapper gives them parity in one narrow respect: both can now sit in the same brokerage account.
Volatility is the obvious one. The drawdown record in bitcoin's price history includes multiple 70% to 80% falls, and an ETF account statement makes those numbers feel considerably more real than a balance in a crypto app.
Less obvious risks:
And a behavioural one. Because the shares are so easy to trade, they invite the exact behaviour that ruins returns, which is buying after a run-up and selling into a drawdown. The significance of a new bitcoin all-time high is mostly psychological, but psychologically it's very powerful, and clicking a sell button on a bad Tuesday is far easier than transferring coins.
Start with the net expense ratio after any waiver expires, not the promotional rate. Then look at assets under management and average daily volume, because liquidity determines your real trading cost more than the quoted fee does. Check who the custodian is and whether the fund publishes its bitcoin addresses or holdings data regularly. Read whether the fund settles creations in cash or in kind, which affects how tightly it can track during volatile periods.
Sizing deserves its own line. Most advisers who recommend bitcoin at all suggest an allocation in the low single digits of a portfolio, rebalanced rather than held forever. A 2% position that falls 80% costs you 1.6% of your portfolio. A 20% position in the same crash costs you 16%, which is the kind of number that ends investment plans and marriages in equal measure.
None of this makes the funds a bad idea. For a lot of people they are the only sensible route into the asset, and the difference between 0.19% and 0.25% is not a reason to lose sleep. The reason to pay attention is that the ETF solved an access problem and left every other problem exactly where it was, sitting on the price chart, waiting for the next cycle to make itself known.
Slot ID: blog-post-bottom