Lawyers Argue Bitcoin-to-hBTC Conversion Is Not a Taxable Event. Here Is Why It Matters Beyond the U.S.
Attorneys at Fenwick & West, a Silicon Valley law firm with an established crypto tax practice, published a guest post on the Sui Foundation blog on April 9, 2026, asserting that converting native Bitcoin into hBTC through the Hashi primitive on the Sui blockchain does not constitute a taxable disposal under U.S.
Attorneys at Fenwick & West, a Silicon Valley law firm with an established crypto tax practice, published a guest post on the Sui Foundation blog on April 9, 2026, asserting that converting native Bitcoin into hBTC through the Hashi primitive on the Sui blockchain does not constitute a taxable disposal under U.S. federal income tax law. The argument has direct implications for institutional Bitcoin holders weighing DeFi participation, and it offers a potential template for legal advocates in markets like India, Nigeria, and Kenya where DeFi tax rules remain undefined.
How Hashi Works
Hashi is a Bitcoin collateralization primitive built on Sui. Users send native BTC to a personalized two-of-two multisig address (a Bitcoin wallet that requires two separate cryptographic keys to authorize any transaction, generated specifically for their Sui wallet address). Sui validators, using a process called threshold multi-party computation (MPC), monitor the Bitcoin deposit and collectively mint an equivalent amount of hBTC on the Sui blockchain after reaching quorum. The BTC cannot move without the hBTC token in hand, making hBTC function as a custodial receipt rather than a synthetic or wrapped asset. This distinction is structurally central to the legal argument: Hashi explicitly avoids the synthetic and wrapped asset structures used by products such as wBTC, and Fenwick & West's analysis depends on that architectural choice.
For institutional readers, additional structural details bear on risk assessment. Smart contracts written in Sui's Move language govern loan-to-value ratios and liquidation logic, and real-time oracles trigger automatic collateral calls. A secondary "guardian" layer is built into the protocol to mitigate the risk of validator collusion.
Hashi launched on devnet on March 19, 2026, with mainnet expected later this year. More than 20 institutional partners committed on day one, including BitGo, FalconX, Bullish, Ledger, Cubist, Fordefi, and Erebor Bank.
The Legal Argument
To understand where the Fenwick & West analysis sits in the broader practitioner landscape, it helps to know that lawyers currently hold two competing views on wrapping or collateralizing Bitcoin. The conservative position treats such a transaction as a crypto-to-crypto swap and therefore a taxable event. The aggressive position holds that because the economic substance does not change, no taxable exchange has occurred. The Fenwick & West guest post on the Sui Foundation blog stakes out the aggressive position.
The analysis rests on three pillars. First, the firm argues that hBTC holders retain full beneficial ownership of the underlying Bitcoin throughout the process. The price exposure does not change, and the legal relationship to the asset does not change. Second, Fenwick & West frames hBTC structurally as a receipt, comparable to a coat-check ticket. Receiving the ticket is not a taxable exchange; it is documentation of an existing ownership claim. Third, the attorneys draw on Cottage Savings Association v. Commissioner and Treasury Regulations, which together establish that a taxable exchange requires property that differs "materially either in kind or in extent." Because hBTC represents the same legal entitlements as the underlying BTC, Fenwick & West argues the material difference threshold is not crossed.
The firm put it plainly in their Sui Foundation guest post: hBTC is "evidence and a direct reflection of ownership of the underlying Bitcoin," not a distinct asset. On the question of receipt tokens specifically, the attorneys concluded that "the person has not sold or exchanged the underlying property for U.S. federal income tax purposes."
No specific IRS guidance currently exists on locking Bitcoin into a smart contract and receiving a BTC-linked receipt token. The guest post is proactive legal positioning, not a response to a regulatory ruling. Fenwick & West regularly submits comments to the IRS and U.S. Treasury on crypto tax policy, giving the firm direct regulatory interface that lends weight to its analysis. The guest post was authored by Sean P. McElroy, based in Seattle, and David L. Forst, based in Silicon Valley.
Why This Matters: The Bitcoin-in-DeFi Gap
The stakes are significant. Only approximately 0.22 percent of Bitcoin's total supply, worth around $3.07 billion, is currently deployed in DeFi protocols despite Bitcoin's market capitalization exceeding $1 trillion. Tax uncertainty is a significant barrier discouraging institutional participation. If minting hBTC triggers a taxable capital gain event, institutions holding appreciated Bitcoin could face an immediate tax bill simply for entering a protocol. The Fenwick & West analysis challenges that interpretation directly.
Mysten Labs Co-Founder and CPO Adeniyi Abiodun framed the protocol's broader goal in a statement to CoinTelegraph in March 2026: "We are replacing 'trust me' workarounds with onchain verification."
Regional Implications
The analysis is U.S.-specific, but the underlying legal logic is structurally transferable. Several markets with large Bitcoin holder bases are watching closely.
In India, crypto gains face a 30 percent flat tax, a 1 percent tax deducted at source on every trade, and no ability to offset losses across different assets. The 2026 budget left these rules intact while introducing a ₹45,000 (approximately $545) penalty for reporting lapses. India's Income Tax Department has issued no guidance on DeFi activities including wrapping or lending. If Indian regulators treat hBTC minting as a disposal, a 30 percent gain event would trigger at the time of minting. Institutions there would need a domestic legal analysis drawing on similar beneficial ownership reasoning before participating at scale.
In Nigeria, the Investments and Securities Act 2025 formally recognized digital assets as securities and introduced a 10 percent capital gains tax on disposals. The central question for Nigerian users mirrors the U.S. debate: does minting hBTC constitute a disposal of BTC? The Fenwick & West framework, particularly the beneficial ownership analysis, offers a starting point for local counsel advocating a non-taxable interpretation during Nigeria's ongoing licensing rule development.
In Kenya, a draft Virtual Asset Service Providers Bill introduced in March 2025 by Kenya's National Treasury is still in consultation. Oversight under the proposed framework would sit with the Central Bank of Kenya and the Capital Markets Authority, and the bill incorporates IMF recommendations on inter-agency coordination and AML/CFT alignment. No DeFi-specific tax rules exist. Kenyan users who engage with Hashi at mainnet launch would be operating in a legal grey zone, though that also means early regulatory dialogue incorporating frameworks like Fenwick & West's could shape the final legislation.
In South Africa, the regulatory environment is the most developed in sub-Saharan Africa. The Financial Sector Conduct Authority now requires crypto asset service providers to hold a Crypto Asset Service Provider (CASP) license, and South Africa has implemented the FATF Travel Rule for qualifying crypto transfers. The South African Revenue Service treats crypto assets as property, meaning disposals are subject to capital gains tax. For South African institutional participants, the same beneficial ownership question applies: whether minting hBTC constitutes a disposal under SARS's property treatment framework would require local counsel analysis, but the beneficial ownership reasoning Fenwick & West advances offers a ready starting point for that argument.
Readers outside the United States should note that the Fenwick & West guest post does not constitute legal advice for non-U.S. jurisdictions. Its value for non-U.S. practitioners lies in the replicable model it offers for advocacy: the beneficial ownership framework and the receipt-token analysis can inform domestic legal arguments even where U.S. tax law does not directly apply. Independent local counsel is necessary before drawing conclusions about tax treatment in any other market.
What Comes Next
Hashi's mainnet launch, expected later in 2026, will serve as a real test of institutional appetite. The Sui network posted 220 percent TVL growth year-over-year through 2025 and processed over $1 trillion in stablecoin transfers as of March 2026, providing a live infrastructure foundation. How regulatory bodies in multiple jurisdictions choose to characterize receipt-token structures like hBTC will shape how broadly the Fenwick & West framework is tested in practice. The guest post represents a well-constructed legal framework for Bitcoin DeFi participation, and regulators in multiple jurisdictions will have cause to examine it closely.
This article is for informational purposes only and does not constitute legal or tax advice. Readers in non-U.S. jurisdictions should consult qualified local counsel regarding the tax treatment of digital asset transactions in their markets.