On Sui, “Bitcoin collateral” does not describe one product or risk model. Hashi describes a way to use BTC that remains on Bitcoin, but its current page says Hashi is available on Sui devnet—not as a live mainnet borrowing option. Wrapped BTC such as BitGo WBTC is a token representation backed by BTC in custody and moved across chains using cross-chain infrastructure. Before choosing, identify whether you want to hold BTC exposure, bring BTC to Sui, lend it, or borrow against it: each goal adds different risks.
What is the difference between Hashi and wrapped BTC?
The key distinction is where the bitcoin is held and how an equivalent Sui asset is made available. “Native” in Hashi’s description refers to BTC remaining on the Bitcoin network; it does not mean the BTC itself becomes a Sui token. WBTC, by contrast, is a token representing BTC held by a custodian.
| Question | Hashi’s described BTC-collateral design | BitGo WBTC on Sui |
|---|---|---|
| Where is the BTC? | Hashi says BTC remains on Bitcoin. Its described flow uses a generated deposit address; Sui validators monitor deposits and reach quorum after confirmations. (Sui, “Sui Features | Hashi,” current page, accessed 2026-10-04.) | Sui says each WBTC is backed 1:1 by BTC held in BitGo custody. (Sui, “BitGo Brings WBTC Natively To Sui Through LayerZero,” 2025-12-05.) |
| How does it become usable on Sui? | After validators confirm a deposit, an equivalent BTC representation is minted on Sui for use in smart contracts, according to Hashi’s description. | WBTC is a token representation. Sui’s article says its OFT representation uses LayerZero connectivity for supported cross-chain transfers. |
| What does the source say about availability? | Hashi’s current page says it is available on Sui devnet. That does not establish a mainnet borrowing option. | Sui’s December 2025 article names lending venues that support or were rolling out WBTC collateral-market support; it does not establish that a particular market, token type, or parameter is currently live. |
| What must a user trust? | Hashi identifies the Sui validator set and loan smart contract among the trust assumptions. Its page also describes a personalized 2-of-2 multisig deposit address, threshold Schnorr signatures, a guardian check, price oracles, and automated collateral and liquidation logic. These are Hashi’s product descriptions, not an independent security audit. | Users take on the relevant custody, token-contract, and cross-chain assumptions, as well as the risks of the Sui application where WBTC is used. |
| How is BTC withdrawn? | Hashi describes withdrawal of native BTC after the user repays. The current page does not provide a basis here for comparing exact withdrawal time, fees, or mainnet exit conditions. | Moving WBTC between chains uses a cross-chain route. Exact withdrawal steps, fees, supported asset version, and available exit liquidity depend on the route and app. |
What other BTC representations are on Sui?
Sui’s ecosystem listings include FBTC, LBTC, mBTC, stBTC, tBTC, WBTC, xBTC, and yBTC. These names do not imply identical backing, redemption, or collateral eligibility.
- LBTC and stBTC: Sui’s BTCfi listing describes these as liquid-staking-related assets. Check how rewards, exchange rates, and redemption work; a yield-bearing token may not track or behave exactly like a simple BTC representation.
- tBTC: Sui describes it as a 1:1 BTC-backed token using a decentralized 51-of-100 threshold-signer model.
- xBTC: Sui describes it as an OKX-issued token with a 1:1 reserve mechanism.
- Other listed assets: FBTC, mBTC, and yBTC appear in the ecosystem listing, but the listing alone does not establish each asset’s detailed custody and redemption arrangements or whether a specific lending market accepts it.
These descriptions come from Sui’s “BTCfi on Sui | Earn Yield on Your Bitcoin” listing, accessed 2026-10-04. Confirm the asset’s own documentation for the design and exit path that apply to the exact token you plan to use.
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How should you compare BTC options before using them as collateral?
Compare the complete route—BTC custody or control, cross-chain movement, token, and lending market—not just whether an asset is called “native” or “wrapped.” A failure or restriction in one component can affect access to the collateral even if the others continue to operate.
- Identify the exact asset and goal. Decide whether you want BTC exposure, a transfer to Sui, lending or liquidity provision, or a loan against BTC. Those are different activities. Borrowing introduces liquidation risk; supplying to a liquidity pool introduces pool and price-divergence exposure; leverage can magnify losses.
- Trace custody and control. Establish whether BTC stays on Bitcoin, is held by a custodian, or is controlled through signers or a bridge arrangement. Find out who can authorize movement or release and under what conditions.
- Map the technical dependencies. Check the relevant cross-chain or bridge mechanism, token contract, validator or threshold-signer model, and Sui lending contract. Hashi’s and WBTC’s described arrangements rely on different combinations of these components.
- Verify the exit route. Read the exact withdrawal or redemption instructions for the specific token and application. Check confirmation requirements, fees, liquidity, and any dependence on a custodian, signers, or protocol operations before depositing.
- Inspect the live lending market. In the protocol itself, verify the accepted token type and current loan-to-value ratio (LTV), liquidation threshold, oracle, borrow rate, supply and borrow caps, and available depth. Sui ecosystem articles name venues and assets but do not provide a complete, current parameter sheet; a listing is not proof of a live market or attractive terms.
- Check asset-specific behavior. For a liquid-staked BTC representation, understand how its exchange rate and rewards work and whether those affect valuation or liquidation. Do not assume it is interchangeable with a simple BTC-backed token.
What does Sui’s ecosystem information establish—and what does it not?
Sui’s December 2025 WBTC article names AlphaLend, Bucket Protocol, NAVI, and SuiLend as supporting or rolling out support in borrowing or collateral markets. A separate Sui ecosystem article lists additional BTC assets and venues. These are useful places to investigate, but they do not guarantee a current integration, the exact supported token contract, available liquidity, or safe market parameters. Verify those details in the specific app and its protocol documentation before acting.
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For Hashi, use its current availability statement rather than earlier rollout coverage: the current Hashi page says “Hashi is now available on Sui devnet.” Its described collateral mechanics should therefore not be presented as an operational mainnet borrowing route. (Sui, “Sui Features | Hashi,” accessed 2026-10-04; compare the earlier rollout context in “A New Era of Bitcoin-Based Finance Begins: Meet Hashi on Sui,” published 2026-03-19.)
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