Fidelity FBTC basket mechanics and the IBIT cash model

Fidelity Wise Origin Bitcoin Fund (FBTC) allows authorized participants to create or redeem 25,000-share baskets using either cash or bitcoin. This in-kind settlement process differs from the BlackRock iShares Bitcoin Trust (IBIT) model, which relies on cash for these transactions. While retail investors cannot redeem FBTC shares for bitcoin, the ability for institutional players to use bitcoin in the basket creation process provides a specific operational mechanism for managing the fund’s holdings. As of October 2026, FBTC holds $14.7 billion in assets, which represents a smaller scale than IBIT’s $66.3 billion.

I find the operational distinction between these two products useful to understand if you care about how the underlying assets move. IBIT uses Coinbase Prime for third-party custody, while FBTC uses Fidelity Digital Assets, N.A., as its primary custodian. According to the June 30, 2026, financial report, Fidelity Digital Assets held all the fund’s bitcoin. IBIT relies on Coinbase to hold over 98% of its bitcoin in cold storage. The difference in how these firms manage the actual digital assets creates different risk profiles for those who prioritize custody independence.

Fidelity custody and the basket mechanism

Fidelity uses a self-custody model through its affiliate, Fidelity Digital Assets, N.A. This setup means Fidelity manages its own private keys rather than outsourcing the task to a third party like Coinbase. The fund includes BitGo Bank & Trust, N.A. as an additional custodian, although the April 29, 2026, prospectus reported no bitcoin allocated to BitGo. Because Fidelity manages the keys, the fund avoids the third-party dependency seen in the IBIT structure. However, the custody liability terms remain a point of concern because the custodian’s liability for a safekeeping loss generally requires gross negligence or more serious misconduct.

The creation and redemption process works through authorized participants who handle 25,000-share baskets. These participants can use bitcoin to settle these baskets, which provides an in-kind option that IBIT does not offer. This mechanism allows the fund to interact with the bitcoin network more directly at the institutional level. If you buy shares through a broker, you simply sell the shares like any other ETF, but you do not get real custody or the ability to move bitcoin to a private wallet.

The difference in scale between the two funds remains stark. IBIT manages $66.3 billion, which is more than four times the $14.7 billion held by FBTC. This higher level of assets contributes to IBIT having higher daily trading volumes and tighter bid-ask spreads. FBTC has a 30-day median bid-ask spread of 0.04% as of September 24, 2026. IBIT’s larger size makes it a preferred vehicle for institutional traders who require deep liquidity.

IBIT liquidity and cash settlement

BlackRock manages IBIT with a cash-only model for its creation and redemption process. Authorized participants must use cash to create or redeem shares, which prevents the direct exchange of bitcoin for ETF units at the fund level. This model mirrors how many traditional financial products operate, where the cash settlement provides a layer of separation between the security and the physical asset. IBIT attracts significant institutional interest because of this established, liquid structure.

IBIT trades on the Nasdaq and maintains a heavy presence in the institutional market. It has a much higher liquidity profile than FBTC, meaning the trading volume provides smoother execution for large orders. The fund has a beta of 1.8887, which shows it moves with bitcoin volatility similarly to FBTC, which has a beta of 1.8779. Both funds track the price of bitcoin closely, but the way they handle the underlying assets at the institutional level differs.

I would call the IBIT approach more traditional because it relies on the established relationship between BlackRock and Coinbase. This reliance on a third party means that if Coinbase fails or suffers a hack, the fund’s assets could be at risk. Fidelity’s model attempts to mitigate this by using an internal affiliate, but the risk of a single point of failure at Fidelity remains. The choice between the two often comes down to whether a trader prefers the liquidity of IBIT or the self-custody model of FBTC.

Does the increased liquidity of IBIT eventually outweigh the security benefits of Fidelity’s self-custody?

Comparing the costs and risks

Both funds charge an expense ratio of 0.25%. This fee is accrued daily on the prior day’s bitcoin holdings and paid monthly. While the fees appear identical, the total cost of ownership can change based on the brokerage commission you pay to buy or sell the shares. Many brokerages offer commission-free trading for both FBTC and IBIT, but you should check your specific platform.

The risk of price volatility affects both funds equally because they both hold spot bitcoin. A single price swing in the crypto market can exceed a year of the fees you would pay for these products. Because these are ETFs, they do not provide the anonymity or the ability to use bitcoin for direct transactions that a private wallet provides. You are buying a financial product that tracks the price, not the ability to spend bitcoin globally without permission.

The management of these funds also involves different regulatory and operational realities. FBTC is listed on the Cboe and meets SEC reporting requirements as a qualified custodian. IBIT is listed on the Nasdaq and also follows SEC regulations. Both funds are subject to the volatility of the underlying asset and the regulatory environment in the United States.

The liability of the custodians presents a real problem for investors. For FBTC, BitGo’s ordinary-negligence liability is capped at three months’ fees. This means that if a loss occurs through ordinary negligence, the recovery amount stays very low. Both funds offer standard brokerage protections like SIPC for the accounts held at a broker, but this does not protect the underlying bitcoin if the custodian loses it. The difference in how these firms handle insurance and liability is a vital part of the decision for anyone prioritizing asset safety.

I find the IBIT cash-only model more efficient for high-frequency traders who want to avoid the complexities of handling digital assets. However, I see the advantage in FBTC’s ability to use bitcoin in its basket mechanics for institutional participants. You should choose based on whether you value the scale and liquidity of BlackRock or the self-custody approach of Fidelity.