Explainers
The creation and redemption mechanism, explained
How new Bitcoin ETF shares come into existence: authorised participants, baskets, in-kind versus cash orders, and why this plumbing is what keeps share price tied to bitcoin.
Shares in a Bitcoin ETF are not a fixed quantity. They are manufactured and destroyed on demand, in blocks, by a handful of firms most investors have never heard of. That process is the single most important piece of machinery in the entire product, and it is why a share of IBIT tracks bitcoin instead of drifting off on its own like a closed-end fund.
If you have read that "arbitrage keeps ETFs efficient" and wondered what the trade actually looks like, this is the page. Here we cover the plumbing; the profit calculation itself is in arbitrage explained.
Who does what
| Party | Role | Examples |
|---|---|---|
| Sponsor | Creates and operates the trust, sets the fee, appoints service providers | BlackRock, Fidelity, Grayscale |
| Trust | The legal entity that owns the bitcoin and issues shares | iShares Bitcoin Trust ETF |
| Custodian | Holds the private keys in cold storage under a custody agreement | Coinbase Custody, Fidelity Digital Assets, Anchorage, BitGo |
| Authorised participant | The only party that can create or redeem shares directly with the trust | Large registered broker-dealers named in each prospectus |
| Market maker | Quotes continuous two-sided prices on the exchange | Electronic liquidity providers |
| Listing exchange | Lists the shares and enforces its rulebook | Nasdaq, NYSE Arca, Cboe BZX |
| You | Buy and sell shares on the secondary market | Through any brokerage account |
Note the last two rows. Retail investors never interact with the trust at all — you trade with other market participants, and the trust's share count changes only through APs.
Creation, step by step
Suppose demand for a Bitcoin ETF surges. Buyers push the share price slightly above the value of the bitcoin behind each share. Here is what happens next.
- The AP spots the gap
Shares trade at, say, $43.80 while the underlying bitcoin per share is worth $43.74. A six-cent premium on a 10,000-share basket is $600 of theoretical profit.
- It places a creation order
The AP submits an order to the trust for one or more baskets, before the daily cut-off specified in the prospectus.
- It delivers the required assets
Under in-kind rules, the AP delivers actual bitcoin equal to the basket's value. Under cash creation, it wires cash and the trust buys the bitcoin.
- The custodian receives the bitcoin
Coins move into the trust's cold storage addresses at the custodian. Total holdings rise.
- The trust issues new shares
10,000 new shares are created and delivered to the AP. Shares outstanding rise proportionally, so the bitcoin per share is unchanged.
- The AP sells into the market
It sells the shares at the elevated market price, capturing the premium. That supply pushes the price back toward the underlying value, closing the gap it exploited.
Redemption: the same trade in reverse
When selling pressure pushes shares below the value of the underlying bitcoin, the arithmetic inverts. The AP buys cheap shares on the exchange, delivers them to the trust, and receives bitcoin (in kind) or cash worth more than it paid. It sells the bitcoin and books the difference. Shares outstanding fall, the trust's holdings fall, and the buying pressure on shares lifts the price back toward value.
This is what people are watching when they read daily outflow figures. A day of net outflows means redemptions exceeded creations — shares were retired and bitcoin left the trust. It is a measure of fund-level demand, not a direct measure of selling by shareholders. The distinction matters and is explained in flows explained.
In-kind versus cash: the July 2025 change
This distinction sounds procedural and had real consequences. From the January 2024 launches onward, the SEC permitted only cash creations and redemptions for spot bitcoin ETPs. APs wired dollars; the trust bought bitcoin itself.
On 29 July 2025 the SEC approved in-kind creations and redemptions for all US spot bitcoin and ether ETPs — the first major crypto policy shift under chair Paul Atkins. The order cited enhanced tax efficiency and lower transaction costs among the benefits.
| Aspect | Cash (2024 – July 2025) | In-kind (from July 2025) |
|---|---|---|
| What the AP delivers | US dollars | Bitcoin |
| Who executes the BTC trade | The trust, via an agent | The AP, in its own book |
| Execution cost | Borne inside the fund, spread across all holders | Borne by the AP |
| Fund-level tax efficiency | Lower — the trust realises gains on sales | Higher — assets transfer without a sale |
| Effect on tracking error | Wider | Narrower |
| Effect on bid-ask spreads | Wider | Tighter |
The practical benefit to a shareholder is indirect but real: less friction inside the fund means the share price tracks bitcoin more closely and costs less to trade.
What is actually in a basket
A basket is the minimum indivisible unit of creation or redemption. For most spot Bitcoin ETPs it is 10,000 shares, and issuers publish the current basket value daily. On 2 September 2026, IBIT's basket stood at $1,749,211.32, backed by 22.65 bitcoins.
Two things follow from that number. First, this is institutional plumbing — a $1.7 million minimum is not a retail facility, which is why "can I redeem my shares for bitcoin" always gets the same answer. Second, the basket ratio tells you exactly how much bitcoin sits behind a share: 22.65 BTC across 10,000 shares is about 0.002265 BTC per share, and that figure declines slowly as the trust sells bitcoin to pay its fee.
You can hold bitcoin without a 10,000-share minimum
The creation mechanism is designed for institutions. Buying the coin directly has no basket, no cut-off time and no minimum beyond the venue's own — CEX.IO is registered with FinCEN as a money services business, licensed for money transmission across US states, and authorised in Gibraltar as a DLT provider.
Why the design exists at all
The alternative is a closed-end fund: fix the share count at launch and let the market price whatever it likes. That structure has a well-documented failure mode, and crypto provided the textbook example.
Before its January 2024 conversion, the Grayscale Bitcoin Trust had no redemption mechanism. Shares could be created but not retired. When sentiment turned, there was no arbitrage available to close the gap, and GBTC traded at a discount that widened beyond 40% below the value of the bitcoin it held. Investors owned a claim on bitcoin worth substantially more than their shares, with no way to realise it.
Conversion to an ETP restored redemption, and the discount closed within weeks. That episode is the clearest available proof of what this mechanism is for — the full story is in the GBTC profile and NAV and premiums.
When the mechanism strains
It is robust, not invincible. Four conditions can widen the gap between share price and underlying value.
- Underlying market stress. If spot bitcoin liquidity thins sharply, APs face more risk hedging a creation, so they demand a wider gap before acting.
- Custodian or settlement disruption. Creation depends on coins actually moving into trust addresses. Any friction there slows the loop.
- Too few APs. Each fund names its APs, and a fund with a short list is more exposed to any one of them stepping back.
- Non-overlapping hours. Bitcoin trades continuously; the ETF does not. Over a weekend the share price simply cannot respond, and Monday's open absorbs the whole move at once.
The last one is structural and permanent. No amount of good plumbing fixes the fact that the fund is closed when the asset is not.
Our take from the desk
We find this the most reassuring part of the whole product and the least discussed. When people worry about whether an ETF "really" holds the bitcoin, the honest answer is that the creation mechanism gives sophisticated firms a standing financial incentive to check — every single day, with their own capital at risk. That is a far stronger verification system than any marketing claim about institutional-grade custody.