A crypto exchange-traded fund can look deceptively simple on a brokerage screen. Its shares have a ticker, a bid, an offer and a price that moves throughout the trading day. Behind that interface sits a chain of institutions connecting securities markets, banking rails, crypto trading venues and blockchain custody.

Understanding that chain matters because an ETF is not a wallet with a stock symbol attached. Most investors never exchange shares for coins. They trade shares with other investors on an exchange. Only a restricted group of firms can create new shares or redeem existing ones directly with the product, and even those transactions happen in large blocks called baskets.

This article focuses primarily on US-listed spot bitcoin and ether products, where the structure is unusually well documented in regulatory filings. Although these products are commonly called ETFs, many are legally commodity-based trusts or exchange-traded products rather than investment companies registered under the Investment Company Act of 1940. The operational details also vary by product. A prospectus, participant agreement and exchange rule filing, rather than the word ETF alone, determine what a particular vehicle can do.

Two markets sit behind one ticker

The first distinction is between the secondary and primary markets.

The secondary market is the stock exchange. An investor buying 20 shares of a spot bitcoin product is normally buying from another market participant, not sending money to the trust. The seller may be another investor, a broker or a market maker holding inventory. The transaction changes ownership of existing shares but does not automatically cause the fund to buy bitcoin.

The primary market is where the supply of ETF shares expands or contracts. Here, an authorised participant, or AP, can deliver the required assets to the trust and receive a basket of newly issued shares. In the reverse transaction, the AP delivers a basket of shares and receives cash or crypto assets from the trust. Creation increases shares outstanding. Redemption reduces them.

Retail shareholders generally have no direct access to this process. Current filings for the iShares Bitcoin Trust ETF state that only registered broker-dealers which have entered into the required agreement may place basket orders. The same filing describes baskets of 40,000 shares. Fidelity's April 2026 prospectus describes 25,000-share baskets for its bitcoin product, while other trusts use different sizes.

Trading volume transfers shares between market participants. A creation or redemption changes the number of shares outstanding. The two activities are related, but they are not the same event.

Who does what?

The sponsor, trustee and administrator

The sponsor establishes the product and oversees its operation within the governing documents. A trustee may hold legal title to the trust's assets or perform specified management functions. The administrator maintains books, accounts for liabilities and calculates the daily net asset value. A transfer agent processes the issuance and cancellation of shares.

These roles can be divided among affiliated and independent firms. They should not be collapsed into a single idea of the ETF issuer. The entity marketing the product may not calculate NAV, hold the cash, custody the crypto or execute the underlying trades.

The authorised participant

An AP is a financial institution permitted by contract to submit creation and redemption orders. It must also be able to settle the ETF shares through the conventional securities system. APs are often large banks, broker-dealers or trading firms.

AP does not mean permanent buyer of last resort. Fidelity's prospectus says an AP is not obliged to create or redeem baskets. It listed ten APs as at 1 April 2026, including banks and electronic trading firms, but also warned that APs may serve competing products and may reduce their activity during stress.

The market maker

A market maker displays bids and offers on the exchange and manages an inventory of ETF shares. The market maker and AP functions are conceptually separate, even when the same firm or affiliated firms perform both. A market maker without AP status can route a basket transaction through an AP. An AP can facilitate creations without continuously quoting the ETF to the public.

This distinction is often blurred in simplified explainers. It matters because secondary-market liquidity depends on firms willing to quote shares, while primary-market access depends on firms authorised and operationally equipped to transact with the trust.

Crypto trading and custody counterparties

Cash creations require someone to convert dollars into the underlying crypto asset. Depending on the product, execution may involve a prime execution agent, designated liquidity provider, trading counterparty or an affiliate acting in a defined capacity. Cash redemptions reverse that conversion.

A digital asset custodian controls the private keys associated with the trust's holdings. A separate bank may custody cash. Some products appoint an additional crypto custodian to reduce dependence on a single provider, although the existence of a second agreement does not prove that assets are evenly divided between custodians.

How a creation works

Suppose demand pushes the ETF's shares above the value of the crypto represented by each share. A market maker can sell shares into that demand, but doing so consumes inventory or creates a short position. The primary market provides a way to replenish the shares.

  1. The AP submits an order for one or more baskets before the applicable cut-off.
  2. The administrator determines the basket requirement under the product's documents.
  3. The AP, its client or a designated party delivers cash, crypto or an allowed combination.
  4. The custodian or execution counterparty confirms that the required assets have been received or purchased.
  5. The transfer agent processes the issuance of the basket through the securities settlement system.
  6. The AP can hold those shares, transfer them to a market maker or sell them in the secondary market.

If the shares were trading at a sufficient premium, the value received from selling them can exceed the AP's acquisition, hedging, financing, custody, blockchain and processing costs. Competition for that opportunity tends to add share supply and compress the premium.

This is not a risk-free button. The price of the underlying asset may change between order submission, NAV determination, execution and settlement. An AP may hedge with spot crypto, futures or other instruments, but the hedge has its own spreads, margin requirements, basis risk and venue limits.

How redemption reverses the flow

If ETF shares trade below the value of their underlying entitlement, an AP may buy enough shares to assemble a basket and submit it for redemption.

  1. The AP acquires or receives the required number of ETF shares.
  2. It submits a redemption order under the product's timetable.
  3. The shares are delivered through the transfer and settlement system and cancelled.
  4. The trust delivers crypto in kind or arranges a sale and delivers cash, less applicable costs.
  5. The AP closes any hedge and realises the remaining difference between the value received and the cost of the shares.

Removing shares from circulation and selling or transferring the associated underlying asset can help close a discount. Yet arbitrage is not automatic. It operates only when the expected price discrepancy exceeds all relevant costs and risks, and when the institutions in the chain remain willing and able to transact.

Cash versus in-kind baskets

US spot bitcoin products launched in January 2024 using cash creations and redemptions. Spot ether products followed with the same broad restriction. On 29 July 2025, the US Securities and Exchange Commission permitted in-kind creation and redemption for bitcoin and ether ETPs covered by its approval orders.

That regulatory change made in-kind processing possible. It did not make every order in every product in-kind. Current documents show that trusts can support cash, in-kind or both, with the sponsor sometimes retaining discretion over the method.

Cash creation

In a cash creation, the AP delivers dollars. The trust's appointed trading arrangement uses that cash to obtain the crypto required for the new shares. The AP usually bears specified execution differences and transaction charges, although the precise allocation varies.

Cash is operationally accessible to institutions that can settle securities but cannot or do not wish to transfer crypto. Its disadvantage is an additional trade inside the product's creation chain. That trade introduces execution costs and the possibility that the realised crypto price differs from the reference price used for NAV.

In-kind creation

In an in-kind creation, the AP or an approved designee delivers the specified quantity of crypto. The trust issues shares without first converting the AP's cash in the spot market. Redemption can return crypto through the reverse process.

This can move execution and hedging decisions outside the trust, reduce internal turnover and avoid forcing the vehicle to trade the underlying asset for every basket. It can also remove one source of cash-related slippage. It does not eliminate costs. The AP still faces blockchain transfer, custody, compliance, financing and hedging expenses, and only approved entities and wallets may participate.

Bitwise's quarterly report for the period ended 30 June 2026 illustrates the mixed model. It describes 10,000-share baskets and permits either bitcoin or the dollars needed to purchase the basket amount. BlackRock's July 2025 IBIT prospectus likewise describes bitcoin deposits for in-kind activity and cash settlement for cash orders.

NAV is an accounting value, not a live executable price

Net asset value is the value of the trust's assets minus its liabilities. NAV per share divides that figure by shares outstanding. For a single-asset spot product, the main input is the quantity of bitcoin or ether multiplied by a benchmark price, with cash and other assets added and accrued fees and liabilities subtracted.

The difficult part is the benchmark. Crypto trades continuously across multiple venues with no single official closing auction for the global market. Product indexes therefore define eligible venues, observation windows, data filters and calculation methods. Fidelity's 2026 prospectus, for example, describes a volume-weighted median methodology using eligible bitcoin spot markets. The trust values its shares daily as of 4:00 p.m. Eastern Time, and the administrator computes NAV as promptly as practicable afterwards.

An intraday indicative value may be disseminated every 15 seconds, but the same prospectus cautions that it is not a real-time recalculation of official NAV. The market price is the executable price of the ETF share. NAV is a periodic valuation under a methodology. The two can diverge without either number necessarily being erroneous.

Four values should therefore be kept separate:

  • Market price: the latest price at which ETF shares traded.
  • Bid and offer: the prices currently quoted to sellers and buyers.
  • Official NAV: the trust's end-of-day accounting value per share.
  • Indicative value: an intraday estimate intended to inform the market, not a guaranteed dealing price.

Where ETF liquidity really comes from

An ETF's displayed trading volume is only the first layer of liquidity. A market maker can quote more shares than it holds if it can hedge the exposure and create shares later. The effective liquidity of a spot crypto product can therefore draw on several connected pools:

  • existing ETF shares offered in the secondary market;
  • market makers' balance sheets and risk limits;
  • the capacity of APs to create and redeem baskets;
  • liquidity on eligible spot and over-the-counter crypto markets;
  • futures and options used for hedging;
  • cash, custody and blockchain settlement capacity.

This explains why average daily share volume is not a complete measure of capacity. It also explains why underlying crypto liquidity does not pass through without friction. Each link charges for balance sheet, execution or operational risk.

The bid-offer spread reflects that combined cost. It can widen when the underlying asset becomes volatile, when the ETF market is thin, when hedges become expensive or when prices differ sharply across crypto venues. It may also widen near the opening of the US equity session, after weekends or during exchange closures because crypto has continued trading while the share market has not.

A large fund is not guaranteed to have the tightest spread at every moment, and a small fund is not necessarily illiquid. Competition among market makers, basket size, AP coverage, underlying depth and the reliability of the operating chain all contribute.

Custody is part of the liquidity mechanism

Custody is usually discussed as protection against theft, but it also affects settlement speed. Cold storage keeps private keys offline and can reduce exposure to online attacks. Hotter or trading balances allow faster transfers but create a different security profile.

Fidelity's April 2026 prospectus says a majority of bitcoin custodied by its primary custodian is kept in cold storage while a portion remains in hot storage to facilitate transfers. It also explains that the custodian, rather than the sponsor, controls that allocation and does not publicly disclose the precise percentage held for the trust. Transfers out require cryptographic signing and operational approvals.

Creation and redemption therefore cross two settlement architectures. ETF shares move through the Depository Trust Company and conventional market infrastructure. Crypto moves through custodial ledgers, approved accounts and, where an on-chain transfer is required, a blockchain whose confirmed transactions cannot simply be reversed after an error.

Operational controls can slow movement precisely because they are designed to prevent unauthorised movement. During ordinary conditions that trade-off may be invisible. During a rapid redemption cycle, network congestion, wallet checks, cold-storage procedures or a counterparty outage can become liquidity constraints.

What happens under stress?

The arbitrage mechanism is an economic incentive, not a guarantee that market price will equal NAV. Fidelity's filing identifies several conditions that may impede it: insufficient spot liquidity, extreme volatility, difficulty locating a hedge, wide price differences between crypto platforms and failures in creation or redemption processing.

Stress can propagate through the system in several ways:

  • APs step back. They are not required to submit orders. Fewer active firms can reduce competition and allow larger premiums or discounts.
  • Market makers quote wider. Higher volatility and uncertain hedging costs are incorporated into the bid and offer.
  • The benchmark becomes harder to replicate. Constituent venues may show divergent prices, lose connectivity or reject large orders.
  • Cash execution slips. The trust's realised purchase or sale may differ from the benchmark used for the basket.
  • Custody or banking rails slow. Assets may exist but be unavailable within the required settlement window.
  • Equity and crypto hours diverge. News can move the underlying asset while ETF shares cannot trade, producing a repricing gap when the exchange reopens.
  • Creations or redemptions are suspended. Without the primary-market release valve, secondary-market prices can detach more materially from NAV.

The direction of causality is not always obvious. Redemptions can require sales of underlying crypto, but falling crypto prices can also prompt secondary-market selling that eventually produces redemptions. Daily fund-flow estimates describe changes in fund assets or shares. They do not, by themselves, prove why investors traded or identify every hedge and inventory adjustment around the baskets.

The limitations the wrapper does not remove

A spot crypto ETP converts digital-asset exposure into a security that can be held and traded through conventional brokerage infrastructure. It does not turn crypto into a conventional corporate asset with earnings or contractual cash flows. Nor does it confer direct possession of coins on ordinary shareholders.

The structure retains several limitations:

  • Shareholders depend on the sponsor, administrator, APs, market makers, trading counterparties, banks and custodians.
  • Fees and expenses gradually reduce the amount of crypto represented by each share unless another source of income offsets them.
  • The benchmark is a methodology-based estimate of a fragmented global market.
  • Market price can trade above or below NAV, particularly during disruption.
  • Spot products concentrated in one crypto asset remain exposed to that asset's volatility and network risks.
  • Forks, airdrops and other incidental rights may be handled, sold or abandoned according to product policy.
  • Staking policy varies among ether products. Grayscale's ETHE filing describes staking and the related liquidity and operational risks, including the time required to unstake and withdraw ether.
  • The US spot bitcoin and ether grantor-trust ETPs discussed here are not registered as investment companies under the Investment Company Act of 1940 and therefore are not subject to that Act's requirements, including its valuation and fund-custody requirements.

The SEC's July 2025 disclosure statement emphasises that crypto ETPs are typically trusts holding spot assets or derivatives and that the products it addresses are not registered investment companies. That legal distinction is more meaningful than the familiar ETF label suggests.

The mechanism in one sentence

A crypto ETF remains close to the value of its holdings when market makers can quote shares, APs can exchange large baskets with the trust, and the surrounding spot, hedge, cash and custody markets let them do so at a cost smaller than the price discrepancy they are trying to capture.

Creation and redemption connect the share market to the underlying asset, but they do not abolish liquidity risk. They relocate and organise it across a network of institutions. In calm conditions that network makes a complex product feel ordinary. Under stress, the spread, premium or discount reveals how much capacity remains in the machinery behind the ticker.